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Ferreira I, de Campos MR, Sahm BD, da Costa Valente ML, Marcondes Agnelli JA, dos Reis AC. Influence of post-processing on the adhesion of dual-species biofilm on polylactic acid obtained by additive manufacturing. Saudi Dent J 2024; 36:733-739. [PMID: 38766297 PMCID: PMC11096603 DOI: 10.1016/j.sdentj.2024.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 03/01/2024] [Accepted: 03/04/2024] [Indexed: 05/22/2024] Open
Abstract
Introduction Post-processing (PP) is performed to improve the surface, which can favor microbial adhesion and consequent pathological manifestations that impair the indication of polylactic acid (PLA) obtained by fused filament fabrication (FFF) for biomedical applications. This aims to evaluate the influence of chemical, thermal, and mechanical PP on the adhesion of Streptococcus mutants and Candida albicans, roughness, and wettability of the PLA obtained by FFF with and without thermal aging. Methods The specimens were designed in the 3D modeling program and printed. The chemical PP was performed by immersion in chloroform, the thermal by the annealing method, and the mechanical by polishing. Thermal aging was performed by alternating the temperature from 5 °C to 55 °C with 5000 cycles. Colony-forming unit (CFU/mL) counting was performed on dual-species biofilm of C. albicans and S. mutans. Roughness was analyzed by rugosimeter and wettability by the sessile drop technique. Data were verified for normality using the Shapiro-Wilk test, two-way ANOVA (α = 0.05) applied for CFU and wettability, and Kruskal-Wallis (α = 0.05) for roughness. Results Chemical, thermal, and mechanical PP methods showed no influence on CFU/mL of C. albicans (p = 0.296) and S. mutans (p = 0.055). Thermal aging did not influence microbial adhesion. Chemical PP had lower roughness, which had increased after aging. Wettability of the mechanical PP was lower. Conclusions Post-processing techniques, do not present an influence on the adhesion of S. mutans and C. albicans in PLA obtained by FFF, chemical PP reduced roughness, and mechanical reduced wettability. Thermal aging did not alter the microbial adhesion and altered the roughness and wettability.
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Affiliation(s)
- Izabela Ferreira
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School (FORP-USP), University of Sao Paulo, São Paulo, Brazil
| | - Murilo Rodrigues de Campos
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School (FORP-USP), University of Sao Paulo, São Paulo, Brazil
| | - Beatriz Danieletto Sahm
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School (FORP-USP), University of Sao Paulo, São Paulo, Brazil
| | - Mariana Lima da Costa Valente
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School (FORP-USP), University of Sao Paulo, São Paulo, Brazil
| | | | - Andréa Cândido dos Reis
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School (FORP-USP), University of Sao Paulo, São Paulo, Brazil
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2
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Alogla A. Enhancing antioxidant delivery through 3D printing: a pathway to advanced therapeutic strategies. Front Bioeng Biotechnol 2023; 11:1256361. [PMID: 37860625 PMCID: PMC10583562 DOI: 10.3389/fbioe.2023.1256361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 09/22/2023] [Indexed: 10/21/2023] Open
Abstract
The rapid advancement of 3D printing has transformed industries, including medicine and pharmaceuticals. Integrating antioxidants into 3D-printed structures offers promising therapeutic strategies for enhanced antioxidant delivery. This review explores the synergistic relationship between 3D printing and antioxidants, focusing on the design and fabrication of antioxidant-loaded constructs. Incorporating antioxidants into 3D-printed matrices enables controlled release and localized delivery, improving efficacy while minimizing side effects. Customization of physical and chemical properties allows tailoring of antioxidant release kinetics, distribution, and degradation profiles. Encapsulation techniques such as direct mixing, coating, and encapsulation are discussed. Material selection, printing parameters, and post-processing methods significantly influence antioxidant release kinetics and stability. Applications include wound healing, tissue regeneration, drug delivery, and personalized medicine. This comprehensive review aims to provide insights into 3D printing-assisted antioxidant delivery systems, facilitating advancements in medicine and improved patient outcomes for oxidative stress-related disorders.
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Affiliation(s)
- Ageel Alogla
- Industrial Engineering Department, College of Engineering (AlQunfudhah), Umm Al-Qura University, Mecca, Saudi Arabia
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3
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Fan Z, Gao J, Wu Y, Yin D, Chen S, Tu H, Wei T, Zhang C, Zhu H, Jin H. Highly Enhanced Mechanical, Thermal, and Crystallization Performance of PLA/PBS Composite by Glass Fiber Coupling Agent Modification. Polymers (Basel) 2023; 15:3164. [PMID: 37571058 PMCID: PMC10421074 DOI: 10.3390/polym15153164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
To improve the toughness and heat resistance of polylactic acid (PLA), polybutylene succinate (PBS) was sufficiently blended with PLA as the base matrix, and the glass fiber (GF) that was modified with 3-aminopropyltriethoxysilane (KF-GF) was added as the reinforcement. The results demonstrated a noteworthy boost in both mechanical and heat resistance properties when employing KH-GF, in comparison to pristine GF. When the content of KH-GF reached 20%, the tensile, flexural, and IZOD impact strength of the composites were 65.53 MPa, 83.43 MPa, and 7.45 kJ/m2, respectively, which were improved by 123%, 107%, and 189% compared to the base matrix, respectively. This enhancement was primarily attributed to the stronger interfacial adhesion between KH-GF and the PLA/PBS matrix. Furthermore, the Vicat softening temperature of the composites reached 128.7 °C, which was a result of increased crystallinity. In summary, the incorporation of KH-GF into PLA/PBS composites resulted in notable enhancements in their mechanical properties, crystallinity, and thermal characteristics. The high performance KH-GF-reinforced PLA/PBS composite showed a broad application potential in the field of biodegradable packaging, biodegradable textiles, and biodegradable plastic bags.
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Affiliation(s)
- Zhiqiang Fan
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Junchang Gao
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Yadong Wu
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Dewu Yin
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
- Cangnan Research Institute, Wenzhou University, Wenzhou 325035, China
| | - Shunxing Chen
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Hua Tu
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Tiantian Wei
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Chaoran Zhang
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Haoxiang Zhu
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
| | - Huile Jin
- Key Laboratory of Leather of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China; (Z.F.); (H.J.)
- Institute of New Materials and Industrial Technology, Wenzhou University, Wenzhou 325035, China
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4
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Cakir Yigit N, Karagoz I. A review of recent advances in bio-based polymer composite filaments for 3D printing. POLYM-PLAST TECH MAT 2023. [DOI: 10.1080/25740881.2023.2190799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
Affiliation(s)
- Nese Cakir Yigit
- Polymer Materials Engineering Department, Yalova University, Yalova, Türkiye
| | - Idris Karagoz
- Polymer Materials Engineering Department, Yalova University, Yalova, Türkiye
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5
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Legett SA, Stockdale JR, Torres X, Yeager CM, Pacheco A, Labouriau A. Functional Filaments: Creating and Degrading pH-Indicating PLA Filaments for 3D Printing. Polymers (Basel) 2023; 15:polym15020436. [PMID: 36679315 PMCID: PMC9866878 DOI: 10.3390/polym15020436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/06/2023] [Accepted: 01/10/2023] [Indexed: 01/19/2023] Open
Abstract
With the rapid pace of advancements in additive manufacturing and techniques such as fused filament fabrication (FFF), the feedstocks used in these techniques should advance as well. While available filaments can be used to print highly customizable parts, the creation of the end part is often the only function of a given feedstock. In this study, novel FFF filaments with inherent environmental sensing functionalities were created by melt-blending poly(lactic acid) (PLA), poly(ethylene glycol) (PEG), and pH indicator powders (bromothymol blue, phenolphthalein, and thymol blue). The new PLA-PEG-indicator filaments were universally more crystalline than the PLA-only filaments (33-41% vs. 19% crystallinity), but changes in thermal stability and mechanical characteristics depended upon the indicator used; filaments containing bromothymol blue and thymol blue were more thermally stable, had higher tensile strength, and were less ductile than PLA-only filaments, while filaments containing phenolphthalein were less thermally stable, had lower tensile strength, and were more ductile. When the indicator-filled filaments were exposed to acidic, neutral, and basic solutions, all filaments functioned as effective pH sensors, though the bromothymol blue-containing filament was only successful as a base indicator. The biodegradability of the new filaments was evaluated by characterizing filament samples after aging in soil and soil slurry mixtures; the amount of physical deterioration and changes in filament crystallinity suggested that the bromothymol blue filament degraded faster than PLA-only filaments, while the phenolphthalein and thymol blue filaments saw decreases in degradation rates.
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6
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Sztorch B, Pakuła D, Kustosz M, Romanczuk-Ruszuk E, Gabriel E, Przekop RE. The Influence of Organofunctional Substituents of Spherosilicates on the Functional Properties of PLA/TiO 2 Composites Used in 3D Printing (FDM/FFF). Polymers (Basel) 2022; 14:polym14245493. [PMID: 36559860 PMCID: PMC9780993 DOI: 10.3390/polym14245493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/16/2022] [Accepted: 11/18/2022] [Indexed: 12/23/2022] Open
Abstract
In this study, the influence of TiO2 pigment filler modified with spherosilicate derivatives on the processes and thermomechanical properties of composites based on PLA was investigated. Rheological tests (MFR) were carried out, on the basis of which it was found that the addition of organosilicon compounds has a plasticizing effect on the polymer-filler systems. TGA and DSC analysis were performed. The analysis of the contact angle showed that 1.5% of the additives had an influence on the superhydrophobic properties of TiO2 (above 135°), and a slight improvement of this parameter was also observed for composites containing the modified pigment. Microscopic analysis and mechanical tests (tensile strength, impact strength and flexural strength tests) were carried out as well. It has been observed that the addition of certain derivatives adversely affects the dispersion of the filler, thus a slight improvement in mechanical properties is observed. For modifiers that do not affect filler agglomeration, a plasticizing effect on the composite is observed.
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Affiliation(s)
- Bogna Sztorch
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
- Correspondence: (B.S.); (R.E.P.)
| | - Daria Pakuła
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
| | - Magdalena Kustosz
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
| | - Eliza Romanczuk-Ruszuk
- Institute of Biomedical Engineering, Faculty of Mechanical Engineering, Bialystok University of Technology, Wiejska 45C Street, 15−351 Bialystok, Poland
| | - Ewa Gabriel
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
| | - Robert E. Przekop
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61−614 Poznań, Poland
- Correspondence: (B.S.); (R.E.P.)
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7
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Ramezani Dana H, Ebrahimi F. Synthesis, properties, and applications of polylactic
acid‐based
polymers. POLYM ENG SCI 2022. [DOI: 10.1002/pen.26193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hossein Ramezani Dana
- Mechanics, Surfaces and Materials Processing (MSMP) – EA 7350 Arts et Metiers Institute of Technology Aix‐en‐Provence France
- Texas A&M Engineering Experiment Station (TEES) Texas A&M University College Station Texas USA
| | - Farnoosh Ebrahimi
- PRISM Polymer, Recycling, Industrial, Sustainability and Manufacturing Technological University of the Shannon (TUS) Athlone Ireland
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8
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Affiliation(s)
- Abhishek Patel
- Department of mechanical engineering, Maulana Azad National Institute of Technology, Bhopal, India
| | - Mohammad Taufik
- Department of mechanical engineering, Maulana Azad National Institute of Technology, Bhopal, India
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9
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Chi M, Li N, Cui J, Karlin S, Rohr N, Sharma N, Thieringer FM. Biomimetic, mussel-inspired surface modification of 3D-printed biodegradable polylactic acid scaffolds with nano-hydroxyapatite for bone tissue engineering. Front Bioeng Biotechnol 2022; 10:989729. [PMID: 36159699 PMCID: PMC9493000 DOI: 10.3389/fbioe.2022.989729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Polylactic acid (PLA) has been widely used as filaments for material extrusion additive manufacturing (AM) to develop patient-specific scaffolds in bone tissue engineering. Hydroxyapatite (HA), a major component of natural bone, has been extensively recognized as an osteoconductive biomolecule. Here, inspired by the mussel-adhesive phenomenon, in this study, polydopamine (PDA) coating was applied to the surface of 3D printed PLA scaffolds (PLA@PDA), acting as a versatile adhesive platform for immobilizing HA nanoparticles (nHA). Comprehensive analyses were performed to understand the physicochemical properties of the 3D-printed PLA scaffold functionalized with nHA and PDA for their potent clinical application as a bone regenerative substitute. Scanning electron microscopy (SEM) and element dispersive X-ray (EDX) confirmed a successful loading of nHA particles on the surface of PLA@PDA after 3 and 7 days of coating (PLA@PDA-HA3 and PLA@PDA-HA7), while the surface micromorphology and porosity remain unchanged after surface modification. The thermogravimetric analysis (TGA) showed that 7.7 % and 12.3% mass ratio of nHA were loaded on the PLA scaffold surface, respectively. The wettability test indicated that the hydrophilicity of nHA-coated scaffolds was greatly enhanced, while the mechanical properties remained uncompromised. The 3D laser scanning confocal microscope (3DLS) images revealed that the surface roughness was significantly increased, reaching Sa (arithmetic mean height) of 0.402 μm in PLA@PDA-HA7. Twenty-eight days of in-vitro degradation results showed that the introduction of nHA to the PLA surface enhances its degradation properties, as evidenced by the SEM images and weight loss test. Furthermore, a sustainable release of Ca2+ from PLA@PDA-HA3 and PLA@PDA-HA7 was recorded, during the degradation process. In contrast, the released hydroxyl group of nHA tends to neutralize the local acidic environments, which was more conducive to osteoblastic differentiation and extracellular mineralization. Taken together, this facile surface modification provides 3D printed PLA scaffolds with effective bone regenerative properties by depositing Ca2+ contents, improving surface hydrophilicity, and enhancing the in-vitro degradation rate.
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Affiliation(s)
- Minghan Chi
- Medical Additive Manufacturing Research Group (Swiss MAM), Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - Na Li
- Medical Additive Manufacturing Research Group (Swiss MAM), Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - Junkui Cui
- Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, United States
| | - Sabrina Karlin
- Biomaterials and Technology, Department of Research, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
| | - Nadja Rohr
- Biomaterials and Technology, Department of Research, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
- Biomaterials and Technology, Department of Reconstructive Dentistry, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
- *Correspondence: Nadja Rohr, ; Neha Sharma,
| | - Neha Sharma
- Medical Additive Manufacturing Research Group (Swiss MAM), Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Oral and Cranio-Maxillofacial Surgery, University Hospital Basel, Basel, Switzerland
- *Correspondence: Nadja Rohr, ; Neha Sharma,
| | - Florian M. Thieringer
- Medical Additive Manufacturing Research Group (Swiss MAM), Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Oral and Cranio-Maxillofacial Surgery, University Hospital Basel, Basel, Switzerland
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10
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Moya-Lopez C, González-Fuentes J, Bravo I, Chapron D, Bourson P, Alonso-Moreno C, Hermida-Merino D. Polylactide Perspectives in Biomedicine: From Novel Synthesis to the Application Performance. Pharmaceutics 2022; 14:pharmaceutics14081673. [PMID: 36015299 PMCID: PMC9415503 DOI: 10.3390/pharmaceutics14081673] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/26/2022] [Accepted: 07/28/2022] [Indexed: 11/24/2022] Open
Abstract
The incessant developments in the pharmaceutical and biomedical fields, particularly, customised solutions for specific diseases with targeted therapeutic treatments, require the design of multicomponent materials with multifunctional capabilities. Biodegradable polymers offer a variety of tailored physicochemical properties minimising health adverse side effects at a low price and weight, which are ideal to design matrices for hybrid materials. PLAs emerge as an ideal candidate to develop novel materials as are endowed withcombined ambivalent performance parameters. The state-of-the-art of use of PLA-based materials aimed at pharmaceutical and biomedical applications is reviewed, with an emphasis on the correlation between the synthesis and the processing conditions that define the nanostructure generated, with the final performance studies typically conducted with either therapeutic agents by in vitro and/or in vivo experiments or biomedical devices.
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Affiliation(s)
- Carmen Moya-Lopez
- Laboratoire Matériaux Optiques Photonique et Systèmes (LMOPS), CentraleSupélec, Université de Lorraine, 57000 Metz, France
| | - Joaquín González-Fuentes
- Centro Regional de Investigaciones Biomédicas (CRIB), 02008 Albacete, Spain
- Facultad de Farmacia de Albacete, Universidad de Castilla-La Mancha, 02008 Albacete, Spain
| | - Iván Bravo
- Facultad de Farmacia de Albacete, Universidad de Castilla-La Mancha, 02008 Albacete, Spain
- Unidad NanoCRIB, Centro Regional de Investigaciones Biomédicas, 02008 Albacete, Spain
| | - David Chapron
- Laboratoire Matériaux Optiques Photonique et Systèmes (LMOPS), CentraleSupélec, Université de Lorraine, 57000 Metz, France
| | - Patrice Bourson
- Laboratoire Matériaux Optiques Photonique et Systèmes (LMOPS), CentraleSupélec, Université de Lorraine, 57000 Metz, France
| | - Carlos Alonso-Moreno
- Facultad de Farmacia de Albacete, Universidad de Castilla-La Mancha, 02008 Albacete, Spain
- Unidad NanoCRIB, Centro Regional de Investigaciones Biomédicas, 02008 Albacete, Spain
| | - Daniel Hermida-Merino
- DUBBLE@ESRF BP CS40220, 38043 Grenoble, France
- Departamento de Física Aplicada, CINBIO, Lagoas-Marcosende Campus, Universidade de Vigo, 36310 Vigo, Spain
- Correspondence: ; Tel.: +33-(0)476882375
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11
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Alao PF, Press R, Kallakas H, Ruponen J, Poltimäe T, Kers J. Investigation of Efficient Alkali Treatment and the Effect of Flame Retardant on the Mechanical and Fire Performance of Frost-Retted Hemp Fiber Reinforced PLA. Polymers (Basel) 2022; 14:polym14112280. [PMID: 35683952 PMCID: PMC9182753 DOI: 10.3390/polym14112280] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/30/2022] [Accepted: 05/31/2022] [Indexed: 01/27/2023] Open
Abstract
This research investigates an effective alkali (NaOH) treatment and fire-retardant coating to produce biocomposites from frost-retted hemp fiber and PLA. The fiber surface treatment with various NaOH concentrations was investigated throughout a range of soaking times. The results show that the extracted non-cellulosic fiber content increases with treatment duration and NaOH concentration, while the fraction of targeted components removed remains nearly unchanged after soaking for 1, 2, and 4 h with a 5 wt.% NaOH solution. At the composite level, the treatment with 5 wt.% NaOH solution for 1 h emerged as the most efficient, with tensile strength, Young’s modulus, flexural strength, and flexural modulus of 89.6 MPa, 9.1 GPa, 121.6 MPa, and 9.6 GPa, respectively, using 30 wt.% fibrous reinforcement. The fire performance of the examined batches of biocomposites improved significantly with the novel fire-retardant (Palonot F1) coating. However, the tensile strength notably decreased, while the flexural properties showed only a slight reduction. In most cases, the biocomposites with the alkali-treated hemp fiber had delayed ignition during the 5 min exposure to the cone heater. The findings in this work contribute to studies that will be required to give design guidelines for sustainable building options.
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Affiliation(s)
- Percy Festus Alao
- Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; (R.P.); (H.K.); (T.P.); (J.K.)
- Correspondence:
| | - Raimond Press
- Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; (R.P.); (H.K.); (T.P.); (J.K.)
| | - Heikko Kallakas
- Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; (R.P.); (H.K.); (T.P.); (J.K.)
| | - Jussi Ruponen
- Department of Biosystems and Bioproducts, Aalto University, Otakaari 1B, 11000 Aalto, Finland;
| | - Triinu Poltimäe
- Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; (R.P.); (H.K.); (T.P.); (J.K.)
| | - Jaan Kers
- Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; (R.P.); (H.K.); (T.P.); (J.K.)
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12
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Rajakaruna RADNV, Subeshan B, Asmatulu E. Fabrication of hydrophobic PLA filaments for additive manufacturing. JOURNAL OF MATERIALS SCIENCE 2022; 57:8987-9001. [PMID: 35527806 PMCID: PMC9053124 DOI: 10.1007/s10853-022-07217-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 04/09/2022] [Indexed: 06/14/2023]
Abstract
There is an ever-greater need for self-cleaning and water-repelling properties of hydrophobic materials at this time in history, mainly due to the coronavirus disease 2019 (COVID-19) pandemic. However, the fabrication processes used to create hydrophobic materials are typically time-consuming and costly. Thus, this study aims to create hydrophobic materials based on low-cost manufacturing. In this study, polylactic acid (PLA) was mixed with various concentrations of hexadecyltrimethoxysilane (HDTMS) and polytetrafluoroethylene (PTFE) with the aid of solvents, chloroform, and acetone, through the solvent casting and melt extrusion process, which is capable of producing hydrophobic PLA filaments suitable for additive manufacturing (AM). Water contact angle (WCA) measurements were performed to verify the improved hydrophobicity of PLA/HDTMS/PTFE filaments. According to the results, it was discovered that the best filament WCAs were achieved with 2 g (10 wt%) of PLA, 0.2 ml of HDTMS, and 1 ml of PTFE (2 g PLA + 0.2 ml HDTMS + 1 ml PTFE), producing an average WCA of 131.6° and the highest WCA of 132.7°. These results indicate that adding HDTMS and PTFE to PLA significantly enhances filament hydrophobicity. Additionally, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) techniques were utilized to characterize the surface morphology, molecular interactions, and thermal decompositions of the prepared PLA/HDTMS/PTFE filaments. This study revealed that compared to 2 g of pure PLA filament, HDTMS and PTFE altered the microstructure of the filament. Its thermal degradation temperature was impacted, but the melting temperature was not. Therefore, the PLA/HDTMS/PTFE filament is good enough to be printed by the fused filament fabrication (FFF) AM process.
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Affiliation(s)
| | - Balakrishnan Subeshan
- Department of Mechanical Engineering, Wichita State University, Wichita, KS 67260 USA
| | - Eylem Asmatulu
- Department of Mechanical Engineering, Wichita State University, Wichita, KS 67260 USA
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13
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A Review of Polylactic Acid as a Replacement Material for Single-Use Laboratory Components. MATERIALS 2022; 15:ma15092989. [PMID: 35591324 PMCID: PMC9100125 DOI: 10.3390/ma15092989] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 04/04/2022] [Accepted: 04/18/2022] [Indexed: 02/04/2023]
Abstract
Every year, the EU emits 13.4 Mt of CO2 solely from plastic production, with 99% of all plastics being produced from fossil fuel sources, while those that are produced from renewable sources use food products as feedstocks. In 2019, 29 Mt of plastic waste was collected in Europe. It is estimated that 32% was recycled, 43% was incinerated and 25% was sent to landfill. It has been estimated that life-sciences (biology, medicine, etc.) alone create plastic waste of approximately 5.5 Mt/yr, the majority being disposed of by incineration. The vast majority of this plastic waste is made from fossil fuel sources, though there is a growing interest in the possible use of bioplastics as a viable alternative for single-use lab consumables, such as petri dishes, pipette tips, etc. However, to-date only limited bioplastic replacement examples exist. In this review, common polymers used for labware are discussed, along with examining the possibility of replacing these materials with bioplastics, specifically polylactic acid (PLA). The material properties of PLA are described, along with possible functional improvements dure to additives. Finally, the standards and benchmarks needed for assessing bioplastics produced for labware components are reviewed.
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Nonato RC, Mei LHI, Bonse BC, Leal CV, Levy CE, Oliveira FA, Delarmelina C, Duarte MCT, Morales AR. Nanocomposites of
PLA
/
ZnO
nanofibers for medical applications: Antimicrobial effect, thermal, and mechanical behavior under cyclic stress. POLYM ENG SCI 2022. [DOI: 10.1002/pen.25913] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Renato C. Nonato
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Lucia H. I. Mei
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Baltus C. Bonse
- Department of Materials Engineering Centro Universitário da FEI São Bernardo do Campo Brazil
| | - Claudenete V. Leal
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Carlos E. Levy
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Flavio A. Oliveira
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Camila Delarmelina
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Marta C. T. Duarte
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
| | - Ana R. Morales
- Department of Materials Engineering, School of Chemical Engineering University of Campinas Campinas Brazil
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15
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The Effect of Alkaline Treatment on Poly(Lactic Acid)/Date Palm Wood Green Composites for Thermal Insulation. Polymers (Basel) 2022; 14:polym14061143. [PMID: 35335474 PMCID: PMC8954477 DOI: 10.3390/polym14061143] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/22/2022] [Accepted: 03/01/2022] [Indexed: 02/04/2023] Open
Abstract
In this work, the effect of alkaline treatment on the thermal insulation and mechanical properties of date palm wood fibers (DPWF) and polylactic acid (PLA) green composite was studied. Alkaline treatment was applied to DPWF using two different solutions: sodium hydroxide (NaOH) and potassium hydroxide (KOH), with concentration of 2 vol.%. The fibers were later incorporated into PLA with weight percentages from 10 to 40 wt.%, to form three composite types: PLA with untreated fibers (PLA-UTDPWF), PLA with KOH treated fibers (PLA-KOH), and PLA with NaOH treated fibers (PLA-NaOH). The prepared composites were for use as a green thermal insulation material. The composites were tested to assess the effect of treatment on their physical (density and degree of crystallization), thermal (thermal conductivity, specific heat capacity, thermal diffusivity, thermal degradation, glass transition, and melting temperature), and mechanical properties. Moreover, the composite structural characteristics were investigated using FTIR and SEM analysis. The alkaline treatment significantly increased the crystallinity of the composites, specifically for higher filler loadings of 30 and 40 wt.%. The crystallinity for the 40 wt.% increased from 33.2% for PLA-UTDPWF, to 41% and 51%, for PLA-NaOH and PLA-KOH, respectively. Moreover, the alkaline treatment reduced the density and produced lighter composites than the untreated specimens. For instance, the density of 40 wt.% composite was reduced from 1.43, to 1.22 and 1.30 gcm3 for PLA-NaOH and PLA-KOH, respectively.
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Akshaykranth A, Jayarambabu N, Venkatappa Rao T, Rakesh Kumar R, Srinivasa Rao L. Antibacterial activity study of ZnO incorporated biodegradable poly (lactic acid) films for food packaging applications. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04126-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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17
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Gruber P, Hoppe V, Grochowska E, Paleczny J, Junka A, Smolina I, Kurzynowski T. Material Extrusion-Based Additive Manufacturing of Poly(Lactic Acid) Antibacterial Filaments-A Case Study of Antimicrobial Properties. Polymers (Basel) 2021; 13:4337. [PMID: 34960888 PMCID: PMC8704716 DOI: 10.3390/polym13244337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/07/2021] [Accepted: 12/07/2021] [Indexed: 11/17/2022] Open
Abstract
In the era of the coronavirus pandemic, one of the most demanding areas was the supply of healthcare systems in essential Personal Protection Equipment (PPE), including face-shields and hands-free door openers. This need, impossible to fill by traditional manufacturing methods, was met by implementing of such emerging technologies as additive manufacturing (AM/3D printing). In this article, Poly(lactic acid) (PLA) filaments for Fused filament fabrication (FFF) technology in the context of the antibacterial properties of finished products were analyzed. The methodology included 2D radiography and scanning electron microscopy (SEM) analysis to determine the presence of antimicrobial additives in the material and their impact on such hospital pathogens as Staphylococcus aureus, Pseudomonas aeruginosa, and Clostridium difficile. The results show that not all tested materials displayed the expected antimicrobial properties after processing in FFF technology. The results showed that in the case of specific species of bacteria, the FFF samples, produced using the declared antibacterial materials, may even stimulate the microbial growth. The novelty of the results relies on methodological approach exceeding scope of ISO 22196 standard and is based on tests with three different species of bacteria in two types of media simulating common body fluids that can be found on frequently touched, nosocomial surfaces. The data presented in this article is of pivotal meaning taking under consideration the increasing interest in application of such products in the clinical setting.
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Affiliation(s)
- Piotr Gruber
- Center for Advanced Manufacturing Technologies (CAMT-FPC), Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland; (P.G.); (E.G.); (I.S.); (T.K.)
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland
| | - Viktoria Hoppe
- Center for Advanced Manufacturing Technologies (CAMT-FPC), Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland; (P.G.); (E.G.); (I.S.); (T.K.)
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland
| | - Emilia Grochowska
- Center for Advanced Manufacturing Technologies (CAMT-FPC), Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland; (P.G.); (E.G.); (I.S.); (T.K.)
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland
| | - Justyna Paleczny
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, 50-556 Wroclaw, Poland; (J.P.); (A.J.)
| | - Adam Junka
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, 50-556 Wroclaw, Poland; (J.P.); (A.J.)
| | - Irina Smolina
- Center for Advanced Manufacturing Technologies (CAMT-FPC), Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland; (P.G.); (E.G.); (I.S.); (T.K.)
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland
| | - Tomasz Kurzynowski
- Center for Advanced Manufacturing Technologies (CAMT-FPC), Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland; (P.G.); (E.G.); (I.S.); (T.K.)
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland
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18
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Brounstein Z, Zhao J, Wheat J, Labouriau A. Tuning the 3D Printability and Thermomechanical Properties of Radiation Shields. Polymers (Basel) 2021; 13:3284. [PMID: 34641099 PMCID: PMC8512519 DOI: 10.3390/polym13193284] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 09/16/2021] [Accepted: 09/23/2021] [Indexed: 12/29/2022] Open
Abstract
Additive manufacturing, with its rapid advances in materials science, allows for researchers and companies to have the ability to create novel formulations and final parts that would have been difficult or near impossible to fabricate with traditional manufacturing methods. One such 3D printing technology, direct ink writing, is especially advantageous in fields requiring customizable parts with high amounts of functional fillers. Nuclear technology is a prime example of a field that necessitates new material design with regard to unique parts that also provide radiation shielding. Indeed, much effort has been focused on developing new rigid radiation shielding components, but DIW remains a less explored technology with a lot of potential for nuclear applications. In this study, DIW formulations that can behave as radiation shields were developed and were printed with varying amounts of porosity to tune the thermomechanical performance.
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Affiliation(s)
- Zachary Brounstein
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
- Department of Nanoscience and Microsystems Engineering, University of New Mexico, Albuquerque, NM 87131, USA
| | - Jianchao Zhao
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jeffrey Wheat
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
| | - Andrea Labouriau
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (Z.B.); (J.Z.); (J.W.)
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Shamsuri AA, Md. Jamil SNA, Abdan K. A Brief Review on the Influence of Ionic Liquids on the Mechanical, Thermal, and Chemical Properties of Biodegradable Polymer Composites. Polymers (Basel) 2021; 13:2597. [PMID: 34451137 PMCID: PMC8401555 DOI: 10.3390/polym13162597] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 07/31/2021] [Accepted: 08/02/2021] [Indexed: 11/25/2022] Open
Abstract
Biodegradable polymers are an exceptional class of polymers that can be decomposed by bacteria. They have received significant interest from researchers in several fields. Besides this, biodegradable polymers can also be incorporated with fillers to fabricate biodegradable polymer composites. Recently, a variety of ionic liquids have also been applied in the fabrication of the polymer composites. In this brief review, two types of fillers that are utilized for the fabrication of biodegradable polymer composites, specifically organic fillers and inorganic fillers, are described. Three types of synthetic biodegradable polymers that are commonly used in biodegradable polymer composites, namely polylactic acid (PLA), polybutylene succinate (PBS), and polycaprolactone (PCL), are reviewed as well. Additionally, the influence of two types of ionic liquid, namely alkylimidazolium- and alkylphosphonium-based ionic liquids, on the mechanical, thermal, and chemical properties of the polymer composites, is also briefly reviewed. This review may be beneficial in providing insights into polymer composite investigators by enhancing the properties of biodegradable polymer composites via the employment of ionic liquids.
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Affiliation(s)
- Ahmad Adlie Shamsuri
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, UPM Serdang 43400, Selangor, Malaysia
| | - Siti Nurul Ain Md. Jamil
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, UPM Serdang 43400, Selangor, Malaysia;
- Centre of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, UPM Serdang 43400, Selangor, Malaysia
| | - Khalina Abdan
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, UPM Serdang 43400, Selangor, Malaysia
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20
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Ebrahimi F, Ramezani Dana H. Poly lactic acid (PLA) polymers: from properties to biomedical applications. INT J POLYM MATER PO 2021. [DOI: 10.1080/00914037.2021.1944140] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Farnoosh Ebrahimi
- Materials Research Institute, Athlone Institute of Technology, Athlone, Ireland
| | - Hossein Ramezani Dana
- Laboratoire de Mécanique, Surface, Matériaux Procédés (MSMP) – EA 7350, Arts et Metiers Institute of Technology, HESAM Université, Aix-en-Provence, France
- Texas A&M Engineering Experiment Station (TEES), Texas A&M University, College Station, TX, USA
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21
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Ahmed W, Siraj S, Al-Marzouqi AH. Embracing Additive Manufacturing Technology through Fused Filament Fabrication for Antimicrobial with Enhanced Formulated Materials. Polymers (Basel) 2021; 13:1523. [PMID: 34065137 PMCID: PMC8125968 DOI: 10.3390/polym13091523] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 04/29/2021] [Accepted: 05/03/2021] [Indexed: 12/13/2022] Open
Abstract
Antimicrobial materials produced by 3D Printing technology are very beneficial, especially for biomedical applications. Antimicrobial surfaces specifically with enhanced antibacterial property have been prepared using several quaternary salt-based agents, such as quaternary ammonium salts and metallic nanoparticles (NPs), such as copper and zinc, which are incorporated into a polymeric matrix mainly through copolymerization grafting and ionic exchange. This review compared different materials for their effectiveness in providing antimicrobial properties on surfaces. This study will help researchers choose the most suitable method of developing antimicrobial surfaces with the highest efficiency, which can be applied to develop products compatible with 3D Printing Technology.
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Affiliation(s)
- Waleed Ahmed
- Engineering Requirements Unit, College of Engineering, United Arab Emirates University, Al Ain 15551, United Arab Emirates
| | - Sidra Siraj
- Chemical Engineering Department, COE, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (S.S.); (A.H.A.-M.)
| | - Ali H. Al-Marzouqi
- Chemical Engineering Department, COE, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (S.S.); (A.H.A.-M.)
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22
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Plota A, Masek A. Plant-Origin Stabilizer as an Alternative of Natural Additive to Polymers Used in Packaging Materials. Int J Mol Sci 2021; 22:4012. [PMID: 33924597 PMCID: PMC8070550 DOI: 10.3390/ijms22084012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/08/2021] [Accepted: 04/10/2021] [Indexed: 12/23/2022] Open
Abstract
Over the past 25 years, cannabis plants have gained major popularity in the research community. This study aimed to evaluate the antioxidant capacity and stabilization efficiency of cannabidiol (CBD) extract in two different polymers: polylactide (PLA) and ethylene-norbornene copolymer (Topas) that are used in packaging materials more often. The research technology included weathering in a special chamber, surface free energy and color change measurements, surface morphology and Fourier-transform infrared spectroscopy (FTIR) analysis, thermogravimetry, and determination of the oxidation induction time or temperature (OIT) values, based on which the effectiveness of the cannabidiol extract could be estimated. Obtained results showed that the addition of CBD to polymer mixtures significantly increased their resistance to oxidation, and it can be used as a natural stabilizer for polymeric products. Moreover, samples with cannabidiol changed their coloration as a result of weathering. Therefore, this natural additive can also be considered as a colorimetric indicator of aging that informs about the changes in polymeric materials during their lifetime. On the other hand, surface properties of samples with cannabidiol content did not alter much compared to pure Topas and PLA.
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Affiliation(s)
| | - Anna Masek
- Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland;
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23
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Impact of Alkali and Silane Treatment on Hemp/PLA Composites' Performance: From Micro to Macro Scale. Polymers (Basel) 2021; 13:polym13060851. [PMID: 33802035 PMCID: PMC7998247 DOI: 10.3390/polym13060851] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 01/05/2023] Open
Abstract
This study investigated the effect of hemp fiber pretreatments (water and sodium hydroxide) combined with silane treatment, first on the fiber properties (microscale) and then on polylactide (PLA) composite properties (macroscale). At the microscale, Fourier transform infrared, thermogravimetric analysis, and scanning electron microscopy investigations highlighted structural alterations in the fibers, with the removal of targeted components and rearrangement in the cell wall. These structural changes influenced unitary fiber properties. At the macroscale, both pretreatments increased the composites’ tensile properties, despite their negative impact on fiber performance. Additionally, silane treatment improved composite performance thanks to higher performance of the fibers themselves and improved fiber compatibility with the PLA matrix brought on by the silane couplings. PLA composites reinforced by 30 wt.% alkali and silane treated hemp fibers exhibited the highest tensile strength (62 MPa), flexural strength (113 MPa), and Young’s modulus (7.6 GPa). Overall, the paper demonstrates the applicability of locally grown, frost-retted hemp fibers for the development of bio-based composites with low density (1.13 to 1.23 g cm−3).
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