1
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Huang B, Wang Y, Vyas C, Bartolo P. Crystal Growth of 3D Poly(ε-caprolactone) Based Bone Scaffolds and Its Effects on the Physical Properties and Cellular Interactions. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 10:e2203183. [PMID: 36394087 PMCID: PMC9811450 DOI: 10.1002/advs.202203183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Extrusion additive manufacturing is widely used to fabricate polymer-based 3D bone scaffolds. However, the insight views of crystal growths, scaffold features and eventually cell-scaffold interactions are still unknown. In this work, melt and solvent extrusion additive manufacturing techniques are used to produce scaffolds considering highly analogous printing conditions. Results show that the scaffolds produced by these two techniques present distinct physiochemical properties, with melt-printed scaffolds showing stronger mechanical properties and solvent-printed scaffolds showing rougher surface, higher degradation rate, and faster stress relaxation. These differences are attributed to the two different crystal growth kinetics, temperature-induced crystallization (TIC) and strain-induced crystallization (SIC), forming large/integrated spherulite-like and a small/fragmented lamella-like crystal regions respectively. The stiffer substrate of melt-printed scaffolds contributes to higher ratio of nuclear Yes-associated protein (YAP) allocation, favoring cell proliferation and differentiation. Faster relaxation and degradation of solvent-printed scaffolds result in dynamic surface, contributing to an early-stage faster osteogenesis differentiation.
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Affiliation(s)
- Boyang Huang
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Yaxin Wang
- School of MechanicalAerospace and Civil EngineeringUniversity of ManchesterManchesterM13 9PLUK
| | - Cian Vyas
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- School of MechanicalAerospace and Civil EngineeringUniversity of ManchesterManchesterM13 9PLUK
| | - Paulo Bartolo
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- School of MechanicalAerospace and Civil EngineeringUniversity of ManchesterManchesterM13 9PLUK
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2
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Rabiei N, Kish MH. Aminolysis of polyesters for cracking and structure clarifying: A review. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Navid Rabiei
- Department of Textile Engineering Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran
| | - Mohammad Haghighat Kish
- Department of Textile Engineering Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran
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3
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Chen W, Zhang X, Tan D, Xu P, Yang B, Shi K, Zhu B, Liu Q, Lei Y, Liu S, Xue L. Improvement in Mechanical Properties of 3D-Printed PEEK Structure by Nonsolvent Vapor Annealing. Macromol Rapid Commun 2022; 43:e2100874. [PMID: 35139235 DOI: 10.1002/marc.202100874] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/23/2022] [Indexed: 11/06/2022]
Abstract
The broad applications of 3D-printed poly-ether-ether-ketone (3D-PEEK) structures are largely hampered by their inadequate mechanical properties which can be improved by post treatments. At present, thermal annealing is generally used to improve the mechanical properties of 3D-PEEK. However, it cannot simultaneously improve the strength and ductility. Here, a cost-effective post-processing method is developed to improve the mechanical properties of 3D-PEEK, based on annealing in nonsolvent vapor at room temperature. The annealing in nonsolvent vapor at room temperature simultaneously improves the strength, ductility, and fracture energy of as-printed 3D-PEEK by 22.6%, 151.3% and 109.1%, respectively. The improved mechanical properties are attributed to enhanced interfacial bonding, increased crystallinity, decreased pinhole defects, and stress relaxation in the 3D-PEEK. Moreover, the annealing in both polar solvents (such as acetone and chloroform) and nonpolar solvents (such as n-hexane) are demonstrated to be effective for improving the mechanical properties of 3D-PEEK. The nonsolvent vapor-annealed 3D-PEEK can thus have potential applications in the fields of medical implants, automotive, aerospace, and more. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Wenhui Chen
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Xiaolong Zhang
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Di Tan
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Peng Xu
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Baisong Yang
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Kui Shi
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Bo Zhu
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Quan Liu
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Yifeng Lei
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Sheng Liu
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
| | - Longjian Xue
- School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072, China
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4
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Abstract
In this work, Polyethylene terephthalate (PET), one of the most widely consumed polymers, has been used as starting material for the development of non-stick surfaces through a fast, simple and scalable method based on solvent-induced crystallization to generate roughness, followed by a fluorination step. Several solvents were tested, among which dichloromethane was chosen because it gives rise to the formation of a particulate layer with rough topography. This particulate layer was covered by a polymer thin and smooth skin that must be removed to leave the rough layer as surface. The skin has been successfully removed by two strategies based on mechanical and chemical removal, each strategy producing different surface properties. A final treatment with a diluted solution of a fluorinated silane showed that it is possible to obtain PET surfaces with a water contact angle higher than 150° and low water adhesion. The reason behind this behavior is the development of a hierarchical rough profile during the induced polymer crystallization process. These surfaces were characterized by XRD, FTIR and DSC to monitor solvent induced crystallization. Topography was studied by SEM and optical profilometry. Wetting behavior was studied by measuring the contact angles and hysteresis.
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5
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Song J, Zhao Q, Meng C, Meng J, Chen Z, Li J. Hierarchical Porous Recycled PET Nanofibers for High-Efficiency Aerosols and Virus Capturing. ACS APPLIED MATERIALS & INTERFACES 2021; 13:49380-49389. [PMID: 34613694 DOI: 10.1021/acsami.1c17157] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Plastic crisis, especially for poly(ethylene terephthalate) (PET) bottles, has been one of the greatest challenges for the earth and human beings. Processing recycled PET (rPET) into functional materials has the dual significance of both sustainable development and economy. Providing more possibilities for the engineered application of rPET, porous PET fibers can further enhance the high specific surface area of electrospun membranes. Here, we use a two-step strategy of electrospinning and postprocessing to successfully control the surface morphology of rPET fibers. Through a series of optical and thermal characterizations, the porous morphology formation mechanism and crystallinity induced by solvents of rPET fibers were discussed. Then, this work further investigated both PM2.5 air pollutants and protein filtration performance of rPET fibrous membrane. The high capture capability of rPET membrane demonstrated its potential application as an integrated high-efficiency aerosol filtering solution.
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Affiliation(s)
- Jun Song
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
| | - Qi Zhao
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
| | - Chen Meng
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
| | - Jinmin Meng
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
| | - Zhongda Chen
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
| | - Jiashen Li
- Department of Materials, The University of Manchester, Manchester M13 9PL, U.K
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6
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Udayakumar M, Kollár M, Kristály F, Leskó M, Szabó T, Marossy K, Tasnádi I, Németh Z. Temperature and Time Dependence of the Solvent-Induced Crystallization of Poly( l-lactide). Polymers (Basel) 2020; 12:polym12051065. [PMID: 32384750 PMCID: PMC7284506 DOI: 10.3390/polym12051065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 04/29/2020] [Accepted: 05/01/2020] [Indexed: 11/17/2022] Open
Abstract
The role of organic solvents in governing the crystallization and morphology of semi-crystalline poly-l-lactide (PLLA) sheets was systematically investigated. Three different organic solvents; ethyl acetate (EA), o-dichlorobenzene (ODCB), and nitrobenzene (NB), with a solubility parameter analogous to PLLA and with a high capability of swelling, were chosen. It has been witnessed that the degree of crystallization and crystal morphology depends highly on the degree of swelling and evaporation rate of the solvent. Besides, the temperature and time of treatment played a significant role in the crystallization of polymers. The effect of different solvents and curing times are reflected by the measured X-ray diffraction (XRD) peaks and the differences are best shown by the unit cell size. The largest variation is observed along the c-axis, indicating shorter bonds, thus, showing better conformation after NB and ODCB treatment. The percentage of crystallinity calculated using the classical relative crystallinity index of XRD shows closer values to those calculated with differential scanning calorimetry (DSC) data, but a huge variation is observed while using the LeBail deconvolution method. The strong birefringence of polarised optical micrograph (POM) and the crystal morphology of scanning electron micrograph (SEM) also evidenced the orientation of polymer crystallites and increased crystallinity after solvent-supported heat treatment.
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Affiliation(s)
- Mahitha Udayakumar
- Higher Education and Industry Cooperation Centre of Advanced Materials and Intelligent Technologies, University of Miskolc, H-3515 Miskolc, Hungary;
- Institute of Chemistry, University of Miskolc, H-3515 Miskolc, Hungary
| | - Mariann Kollár
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Ferenc Kristály
- Institute of Mineralogy and Geology, University of Miskolc, H-3515 Miskolc, Hungary; (F.K.); (M.L.)
| | - Máté Leskó
- Institute of Mineralogy and Geology, University of Miskolc, H-3515 Miskolc, Hungary; (F.K.); (M.L.)
| | - Tamás Szabó
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Kálmán Marossy
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Ildikó Tasnádi
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Zoltán Németh
- Higher Education and Industry Cooperation Centre of Advanced Materials and Intelligent Technologies, University of Miskolc, H-3515 Miskolc, Hungary;
- Institute of Chemistry, University of Miskolc, H-3515 Miskolc, Hungary
- Correspondence: ; Tel.: +36-46-565-111 (ext. 1380)
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7
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Musto P, Loianno V, Scherillo G, La Manna P, Galizia M, Guerra G, Mensitieri G. Benzene-Induced Crystallization of PPO: A Combined Thermodynamic and Vibrational Spectroscopy Study. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b04563] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pellegrino Musto
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
| | - Valerio Loianno
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Giuseppe Scherillo
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Pietro La Manna
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
| | - Michele Galizia
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, 100 E. Boyd Street, Norman, Oklahoma 73019, United States
| | - Gaetano Guerra
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II 132, Fisciano Salerno 84084, Italy
| | - Giuseppe Mensitieri
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
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8
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Tap TD, Nguyen LL, Zhao Y, Hasegawa S, Sawada S, Hung NQ, Tuyen LA, Maekawa Y. SAXS Investigation on Morphological Change in Lamellar Structures During Propagation Steps of Graft‐Type Polymer Electrolyte Membranes for Fuel Cell Applications. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tran Duy Tap
- Faculty of Materials Science and TechnologyUniversity of ScienceVietnam National University Ho Chi Minh City 227 Nguyen Van Cu, District 5 Ho Chi Minh City Vietnam
| | - La Ly Nguyen
- Faculty of Materials Science and TechnologyUniversity of ScienceVietnam National University Ho Chi Minh City 227 Nguyen Van Cu, District 5 Ho Chi Minh City Vietnam
- Center for Nuclear TechniquesVietnam Atomic Energy Institute 217 Nguyen Trai, District 1 Ho Chi Minh City Vietnam
- Institute for Nanotechnology (INT)Vietnam National University Ho Chi Minh City Community 6, Linh Trung Ward, Thu Duc District Ho Chi Minh City Vietnam
| | - Yue Zhao
- Department of Advanced Functional Materials ResearchTakasaki Advanced Radiation Research InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and Technology (QST) 1233 Watanuki Takasaki Gunma 370‐1292 Japan
| | - Shin Hasegawa
- Department of Advanced Functional Materials ResearchTakasaki Advanced Radiation Research InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and Technology (QST) 1233 Watanuki Takasaki Gunma 370‐1292 Japan
| | - Shin‐ichi Sawada
- Department of Advanced Functional Materials ResearchTakasaki Advanced Radiation Research InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and Technology (QST) 1233 Watanuki Takasaki Gunma 370‐1292 Japan
| | - Nguyen Quang Hung
- Institute of Fundamental and Applied SciencesDuy Tan University 10C Tran Nhat Duat Street, District 1 Ho Chi Minh City Vietnam
| | - Luu Anh Tuyen
- Center for Nuclear TechniquesVietnam Atomic Energy Institute 217 Nguyen Trai, District 1 Ho Chi Minh City Vietnam
- Joint Institute for Nuclear Research 6 Joliot Curie 141980 Dubna Russia
| | - Yasunari Maekawa
- Department of Advanced Functional Materials ResearchTakasaki Advanced Radiation Research InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and Technology (QST) 1233 Watanuki Takasaki Gunma 370‐1292 Japan
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9
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Non-woven fabrics of fine regenerated cellulose fibers prepared from ionic-liquid solution via wet type solution blow spinning. Carbohydr Polym 2019; 226:115258. [DOI: 10.1016/j.carbpol.2019.115258] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 08/25/2019] [Accepted: 08/26/2019] [Indexed: 01/26/2023]
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10
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Zhang J, Jones S, Wang D, Wood A, Washington T, Acreman K, Cuevas B, Karau A. Influence of thermal annealing on mechanical properties and
in vitro
degradation of poly(
p
‐dioxanone). POLYM ENG SCI 2019. [DOI: 10.1002/pen.25169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jian‐Feng Zhang
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Scott Jones
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Donghui Wang
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Andrew Wood
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Tommy Washington
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Kevin Acreman
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Brian Cuevas
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Andreas Karau
- Business Line Health Science, Evonik Nutrition & Care GmbH Darmstadt 64293 Germany
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11
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Adams A. Non-destructive analysis of polymers and polymer-based materials by compact NMR. Magn Reson Imaging 2018; 56:119-125. [PMID: 30243579 DOI: 10.1016/j.mri.2018.09.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/14/2018] [Accepted: 09/16/2018] [Indexed: 12/19/2022]
Abstract
Low-field nuclear magnetic resonance (NMR) based on permanent magnet technologies is currently experiencing a considerable growth of popularity in studying polymer materials. Various bulk properties can be probed with compact NMR tabletop instruments by placing the sample of interest inside the magnet. Contrary to this, compact NMR sensors with open geometries give access to depth-dependent properties of polymer samples and objects of different sizes and shapes truly non-destructively by performing measurements in the inhomogeneous stray-field outside the magnet system. Some of the sensors are also portable being thus well suited for onsite measurements. The gain of both bulk and depth-dependent microscopic properties are important for establishing improved structure-property relationships needed for the rational design of new polymer formulations. Selected recent applications will be presented to illustrate this potential of compact NMR.
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Affiliation(s)
- Alina Adams
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany.
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12
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Shaiju P, Murthy NS, Gowd EB. Nonsolvent-induced morphological changes and nanoporosity in poly(l-lactide) films. SOFT MATTER 2018; 14:1492-1498. [PMID: 29404553 DOI: 10.1039/c8sm00041g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The role of a nonsolvent in controlling the crystallization and morphology of solvent-crystallized poly(l-lactide) (PLLA) films was investigated using various microscopy techniques and small- and wide-angle X-ray scattering (SAXS/WAXS). PLLA films crystallized in THF and acetone had 40-80 μm spherulites. When water was present in the solvent, a completely different morphology was observed with nanosized voids and the surfaces of the films were smooth. In contrast, SEM studies revealed that the films crystallized in acetone and THF which had macroporous structures, had larger voids and film surfaces were rough because of the presence of globular structures. Voids appeared within the spherulites in the THF/water treated film, whereas crystals nucleated at the surface of the nanosized voids in acetone/water treated PLLA films. The formation of such voids is attributed to the interface-enhanced crystal nucleation in a solvent/nonsolvent system where the nonsolvent increases the polymer crystal nucleation and the subsequent evaporation of the nonsolvent. The method described in this work can be extended to other polymers to control the morphologies of polymer films during solvent-induced crystallization.
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Affiliation(s)
- P Shaiju
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
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13
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Ramesh N, Hamedi M, Danner RP, Zielinski JM. Solvent-induced crystal formation in polymers: Experimental studies and theoretical modeling of poly(vinyl alcohol) based on free-volume concepts. J Appl Polym Sci 2017. [DOI: 10.1002/app.45171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Mourad Hamedi
- Bristol-Myers Squibb; One Squibb Drive, Building 48 New Brunswick New Jersey 08903
| | - Ronald P. Danner
- Department of Chemical Engineering; Pennsylvania State University, University Park; Pennsylvania 16802
| | - John M. Zielinski
- Intertek Chemicals and Pharmaceuticals; 7201 Hamilton Blvd Allentown Pennsylvania 18195
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14
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Iñiguez-Franco F, Auras R, Burgess G, Holmes D, Fang X, Rubino M, Soto-Valdez H. Concurrent solvent induced crystallization and hydrolytic degradation of PLA by water-ethanol solutions. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.07.018] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Role of ethanol concentration on drawing and infusion behavior of poly(ethylene terephthalate) filaments upon cold drawing. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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17
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Gallyamov MO. Sharp diffusion front in diffusion problem with change of state. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2013; 36:92. [PMID: 23989756 DOI: 10.1140/epje/i2013-13092-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 07/01/2013] [Accepted: 07/05/2013] [Indexed: 06/02/2023]
Abstract
We propose an alternative model of diffusion in polymers, which may explain formation of propagating sharp diffusion fronts to be observed in some experiments. Differently from typical Case II or Stefan problem models, plasticisation of the polymer matrix is not necessarily required. Instead, diffusing small molecules are assumed to be captured by some specific sites of the polymer matrix for certain retention times. For example, they may become adsorbed at the surface of the holes and microvoids that are considered to be present in glassy polymer regions according to the well-known dual-sorption model and are attributed to excess free volume frozen into the glassy matrix. On the other hand, the small molecules may become bound to polymer chains. In this adsorbed/bound state they have much smaller movability and thus are effectively excluded from the diffusion. This adsorption/binding is considered to be a reversible process of state changing, but with asymmetric probabilities for direct and reverse events. With this assumption, taking into account that the amount of space available for such immobilised molecules is limited (limited free volume, limited number of anchoring sites) the model naturally results in the formation of sharp diffusion fronts or strong concentration gradients. Such a diffusion front is a region of effective immobilisation (adsorption/binding, though reversible) of the free diffusing molecules. For the simplest prescribed boundary conditions the diffusion front propagates linearly with the square root of time. By means of imposing generalised boundary conditions, it is possible to model other regimes of propagation of the diffusion front, including constant velocity.
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Affiliation(s)
- Marat O Gallyamov
- Faculty of Physics, Lomonosov Moscow State University, Leninskie gory 1-2, GSP-1, 119991 Moscow, Russian Federation.
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18
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Huang S, Li H, Shang Y, Yu D, Li G, Jiang S, Chen X, An L. Chloroform micro-evaporation induced ordered structures of poly(l-lactide) thin films. RSC Adv 2013. [DOI: 10.1039/c3ra41266k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Naga N, Yoshida Y, Noguchi K, Murase S. Crystallization of Amorphous Poly(Lactic Acid) Induced by Vapor of Acetone to Form High Crystallinity and Transparency Specimen. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/ojpchem.2013.32006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Liu S, Tian J, Wang L, Li H, Sun X. Organic solvent-induced controllable crystallization of the inorganic salt Na3[Au(SO3)2] into ultralong nanobelts and hierarchical microstructures of nanowires. NANOSCALE 2011; 3:1553-1557. [PMID: 21283868 DOI: 10.1039/c0nr00690d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The present paper reports an organic solvent-induced controllable crystallization of a water-soluble inorganic salt Na(3)[Au(SO(3))(2)] into ultralong nanobelts and hierarchical microstructures of one-dimensional (1D) nanowires. It was found that the morphology of the resulting crystals can be fine tuned by simply varying the experimental parameters, such as the ratios of water to organic solvent and gold salt to organic solvent, as well as the type of organic solvent.
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Affiliation(s)
- Sen Liu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China
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21
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Naga N, Yoshida Y, Inui M, Noguchi K, Murase S. Crystallization of amorphous poly(lactic acid) induced by organic solvents. J Appl Polym Sci 2010. [DOI: 10.1002/app.32890] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Luo C, Han X, Gao Y, Liu H. Solvent-Induced Crystallization of PS-b-PEO-b-PS Block Copolymer Films. J MACROMOL SCI B 2010. [DOI: 10.1080/00222340903547380] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Chunyan Luo
- a Laboratory for Advanced Material and Department of Chemistry , East China University of Science and Technology , Shanghai, China
| | - Xia Han
- a Laboratory for Advanced Material and Department of Chemistry , East China University of Science and Technology , Shanghai, China
| | - Ying Gao
- b State Key Laboratory of Polymer Physics and Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, China
| | - Honglai Liu
- a Laboratory for Advanced Material and Department of Chemistry , East China University of Science and Technology , Shanghai, China
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Colomines G, Ducruet V, Courgneau C, Guinault A, Domenek S. Barrier properties of poly(lactic acid) and its morphological changes induced by aroma compound sorption. POLYM INT 2010. [DOI: 10.1002/pi.2793] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hsu GH, Yang YN, Yu TL, Lin HL. Effect of Pre-Melting Time on Crystallization of Poly(ethylene terephthalate). JOURNAL OF POLYMER RESEARCH 2006. [DOI: 10.1007/s10965-006-9052-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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