1
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Crystallization and polymorphic behaviour of melt miscible blends of crystalline homopolymers with close melting temperatures under confinement. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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2
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Miao C, Mauran D, Hamad WY. How hydrogen-bonding interactions and nanocrystal aspect ratios influence the morphology and mechanical performance of polymer nanocomposites reinforced with cellulose nanocrystals. SOFT MATTER 2022; 18:4572-4581. [PMID: 35678756 DOI: 10.1039/d2sm00140c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The performance of polymer nanocomposites reinforced with cellulose nanocrystals (CNCs) is complicated by several factors, primarily CNC-polymer and polymer-polymer interactions. Our current work specifically seeks to address the effects of CNC geometry, CNC-polymer and polymer-polymer interactions on the structure and non-linear mechanical performance of nanocomposites prepared using two water-soluble polymers, polyethylene oxide (PEO) and polyvinyl alcohol (PVA), having different morphological and structural characteristics. PEO and PVA are chosen since they are compatible with CNCs, however, they interact quite differently with CNCs and result in different reinforcement mechanisms. PEO and PVA interact with CNCs via a nucleating effect and H-bonding, which influence the polymer structure in two opposite directions. The nucleating effect tends to lead the polymer chains to form more ordered structures, whereas H-bonding interactions restrict the mobility of the polymer chains. Since PEO has weaker interactions amongst molecular chains than PVA, the properties of PEO are more significantly influenced by CNCs.
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Affiliation(s)
- Chuanwei Miao
- Transformation and Interfaces Group, Bioproducts Innovation Centre of Excellence, FPInnovations, 2665 East Mall, Vancouver, British Columbia, V6T 1Z4, Canada.
| | - Damien Mauran
- Bioproducts Innovation Centre of Excellence, FPInnovations, 570 Saint-Jean Blvd, Pointe-Claire, QC, H9R 3J9, Canada.
| | - Wadood Y Hamad
- Transformation and Interfaces Group, Bioproducts Innovation Centre of Excellence, FPInnovations, 2665 East Mall, Vancouver, British Columbia, V6T 1Z4, Canada.
- Department of Chemistry, University of British Columbia, 2306 Main Mall, Vancouver, BC, V6T 1Z1, Canada
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3
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Non-isothermal crystallization kinetics of confined poly (ethylene oxide) in electrospun nanofibers prepared from polystyrene/ poly (ethylene oxide) blends. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-02984-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Mamun A. Retardation of the growth rate of the basal and overgrown lamellar crystals of PCL/PVME miscible binary blends with thickness confinement. Polym J 2022. [DOI: 10.1038/s41428-021-00610-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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5
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Xue C, Wilson LD. Preparation and characterization of salicylic acid grafted chitosan electrospun fibers. Carbohydr Polym 2022; 275:118751. [PMID: 34742447 DOI: 10.1016/j.carbpol.2021.118751] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 09/15/2021] [Accepted: 10/10/2021] [Indexed: 02/05/2023]
Abstract
Chitosan (chi) and its modified forms as electrospun nanofibers have potential applications in advanced water treatment and biomedicine. Polyethylene oxide (PEO) is an additive commonly used to facilitate the formation of chitosan electrospun fibers because PEO (Mw ≥ 400 kDa) affords chain entanglement that stabilize the electrospinning jet, leading to enhanced formation of chi-based electrospun fibers. Herein, we report on the preparation of chitosan grafted with salicylic acid and its utility to afford improved electrospun fibers with low molecular weight (LMw) PEO (Mw » 100 kDa). A comparison of the interactions between original and grafted chitosan with PEO reveals that stable supramolecular assemblies are established between grafted chitosan and PEO, which provides support that such supramolecular interactions favor formation of chitosan electrospun fibers. Moreover, a porous chitosan electrospun nanofiber was prepared through physical treatment that reveals notably higher (ca. 4-fold) dye uptake than the pristine (unmodified) chitosan electrospun nanofibers.
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Affiliation(s)
- Chen Xue
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
| | - Lee D Wilson
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada.
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6
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Pal S, Srivastava RK, Nandan B. Effect of spinning solvent on crystallization behavior of confined polymers in electrospun nanofibers. POLYMER CRYSTALLIZATION 2021. [DOI: 10.1002/pcr2.10209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Sanchayan Pal
- Department of Textile and Fibre Engineering Indian Institute of Technology Delhi New Delhi Delhi India
| | - Rajiv K. Srivastava
- Department of Textile and Fibre Engineering Indian Institute of Technology Delhi New Delhi Delhi India
| | - Bhanu Nandan
- Department of Textile and Fibre Engineering Indian Institute of Technology Delhi New Delhi Delhi India
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7
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Sangroniz L, Wang B, Su Y, Liu G, Cavallo D, Wang D, Müller AJ. Fractionated crystallization in semicrystalline polymers. Prog Polym Sci 2021. [DOI: 10.1016/j.progpolymsci.2021.101376] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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8
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Gutiérrez González J, Fernández Leyes MD, Ritacco HA, Schroeder WF, Zucchi IA. Long PEO-based nanoribbons generated in a polystyrene matrix through reaction-induced microphase separation followed by a fast crystallization process. SOFT MATTER 2021; 17:2279-2289. [PMID: 33475128 DOI: 10.1039/d0sm02058c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A dispersion of elongated nanostructures with a high aspect ratio in polymer matrices has been reported to provide a material with valuable properties such as mechanical strength, barrier effect and shape memory, among others. In this study, we show the procedure to achieve a distribution of elongated crystalline nanodomains in a PS matrix employing the self-assembly of amphiphilic block copolymers (BCP). The selected BCP was polystyrene-block-polyethylene oxide (PS-b-PEO). It was dissolved at 10 wt% in a styrene (St) monomer and the blend was slowly photopolymerized over four days at room temperature, until the reaction was arrested by vitrification. This blend was initially homogeneous and nanostructuration took place in an early stage of the polymerization as a result of the microphase separation (MS) of PEO blocks. Due to its high tendency to crystallize, demixed PEO blocks crystallized almost concomitantly with MS triggering the growing of the nanostructures. Thus, the time window between the onset of crystallization and the vitrification of the matrix was almost four days, allowing all micelles to have the opportunity to couple to a growing nanostructure. As a result, a population of nanoribbons with average lengths surpassing 10 μm dispersed in a PS matrix was obtained. It was demonstrated that these ribbon-like nanostructures are preserved as long as the heating temperature is located below the Tg of the matrix. If the material is heated above this temperature, softening of the matrix allows the breakup of the molten PEO nanoribbons due to Plateau-Rayleigh instability.
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Affiliation(s)
- Jessica Gutiérrez González
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Av. Cristóbal Colón 10850, B7606WV Mar del Plata, Argentina.
| | - Marcos D Fernández Leyes
- Departamento de Física, Universidad Nacional del Sur (UNS), Instituto de Física del Sur - IFISUR (UNS-CONICET), Bahía Blanca, Argentina
| | - Hernán A Ritacco
- Departamento de Física, Universidad Nacional del Sur (UNS), Instituto de Física del Sur - IFISUR (UNS-CONICET), Bahía Blanca, Argentina
| | - Walter F Schroeder
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Av. Cristóbal Colón 10850, B7606WV Mar del Plata, Argentina.
| | - Ileana A Zucchi
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Av. Cristóbal Colón 10850, B7606WV Mar del Plata, Argentina.
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9
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Herrán R, Molinari FN, Bilbao E, Monsalve LN, Amalvy JI. Fabrication of electrospun fibers from a waterborne soy‐based polyurethane employing polyethylene oxide as a coformer. J Appl Polym Sci 2021. [DOI: 10.1002/app.49815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Rodrigo Herrán
- Grupo Materiales Poliméricos Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA–CCT CONICET La Plata/UNLP) La Plata Argentina
| | - Fabricio N. Molinari
- INTI Materiales Avanzados Instituto Nacional de Tecnología Industrial San Martín Argentina
| | - Emanuel Bilbao
- INTI Nanomateriales Funcionales Instituto Nacional de Tecnología Industrial San Martín Argentina
- CONICET Godoy Cruz 2290 Buenos Aires Argentina
| | - Leandro N. Monsalve
- INTI Nanomateriales Funcionales Instituto Nacional de Tecnología Industrial San Martín Argentina
- CONICET Godoy Cruz 2290 Buenos Aires Argentina
| | - Javier I. Amalvy
- Grupo Materiales Poliméricos Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA–CCT CONICET La Plata/UNLP) La Plata Argentina
- Centro de Investigación y Desarrollo en Ciencia y Tecnología de Materiales (CITEMA‐UTN/CIC) Berisso Argentina
- Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) La Plata Argentina
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10
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Kupka V, Dvořáková E, Manakhov A, Michlíček M, Petruš J, Vojtová L, Zajíčková L. Well-Blended PCL/PEO Electrospun Nanofibers with Functional Properties Enhanced by Plasma Processing. Polymers (Basel) 2020; 12:polym12061403. [PMID: 32580496 PMCID: PMC7362260 DOI: 10.3390/polym12061403] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/11/2020] [Accepted: 06/17/2020] [Indexed: 12/31/2022] Open
Abstract
Biodegradable composite nanofibers were electrospun from poly(ε-caprolactone) (PCL) and poly(ethylene oxide) (PEO) mixtures dissolved in acetic and formic acids. The variation of PCL:PEO concentration in the polymer blend, from 5:95 to 75:25, revealed the tunability of the hydrolytic stability and mechanical properties of the nanofibrous mats. The degradation rate of PCL/PEO nanofibers can be increased compared to pure PCL, and the mechanical properties can be improved compared to pure PEO. Although PCL and PEO have been previously reported as immiscible, the electrospinning into nanofibers having restricted dimensions (250–450 nm) led to a microscopically mixed PCL/PEO blend. However, the hydrolytic stability and tensile tests revealed the segregation of PCL into few-nanometers-thin fibrils in the PEO matrix of each nanofiber. A synergy phenomenon of increased stiffness appeared for the high concentration of PCL in PCL/PEO nanofibrous mats. The pure PCL and PEO mats had a Young’s modulus of about 12 MPa, but the mats made of high concentration PCL in PCL/PEO solution exhibited 2.5-fold higher values. The increase in the PEO content led to faster degradation of mats in water and up to a 20-fold decrease in the nanofibers’ ductility. The surface of the PCL/PEO nanofibers was functionalized by an amine plasma polymer thin film that is known to increase the hydrophilicity and attach proteins efficiently to the surface. The combination of different PCL/PEO blends and amine plasma polymer coating enabled us to tune the surface functionality, the hydrolytic stability, and the mechanical properties of biodegradable nanofibrous mats.
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Affiliation(s)
- Vojtěch Kupka
- Central European Institute of Technology—CEITEC, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic; (V.K.); (J.P.); (L.V.)
- Regional Centre of Advanced Technologies and Materials and Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17 Listopadu 12, 77900 Olomouc, Czech Republic
| | - Eva Dvořáková
- Central European Institute of Technology—CEITEC, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic; (E.D.); (A.M.); (M.M.)
- Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Anton Manakhov
- Central European Institute of Technology—CEITEC, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic; (E.D.); (A.M.); (M.M.)
- Laboratory of Inorganic Nanomaterials, National University of Science and Technology “MISiS”, Leninsky Prospect 4, 119049 Moscow, Russia
| | - Miroslav Michlíček
- Central European Institute of Technology—CEITEC, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic; (E.D.); (A.M.); (M.M.)
- Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Josef Petruš
- Central European Institute of Technology—CEITEC, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic; (V.K.); (J.P.); (L.V.)
- Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 61200 Brno, Czech Republic
| | - Lucy Vojtová
- Central European Institute of Technology—CEITEC, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic; (V.K.); (J.P.); (L.V.)
| | - Lenka Zajíčková
- Central European Institute of Technology—CEITEC, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic; (V.K.); (J.P.); (L.V.)
- Central European Institute of Technology—CEITEC, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic; (E.D.); (A.M.); (M.M.)
- Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
- Correspondence:
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11
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Zhang Z, Ding J, Ocko BM, Lhermitte J, Strzalka J, Choi CH, Fisher FT, Yager KG, Black CT. Nanoconfinement and Salt Synergistically Suppress Crystallization in Polyethylene Oxide. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b01725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zheng Zhang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Junjun Ding
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Benjamin M. Ocko
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Julien Lhermitte
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Joseph Strzalka
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Chang-Hwan Choi
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Frank T. Fisher
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Kevin G. Yager
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Charles T. Black
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
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12
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Fibrous Materials Made of Poly( ε-caprolactone)/Poly(ethylene oxide) -b-Poly( ε-caprolactone) Blends Support Neural Stem Cells Differentiation. Polymers (Basel) 2019; 11:polym11101621. [PMID: 31597231 PMCID: PMC6835932 DOI: 10.3390/polym11101621] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 09/22/2019] [Accepted: 09/27/2019] [Indexed: 02/07/2023] Open
Abstract
In this work, we design and produce micron-sized fiber mats by blending poly(ε-caprolactone) (PCL) with small amounts of block copolymers poly(ethylene oxide)m-block-poly(ε-caprolactone)n (PEOm-b-PCLn) using electrospinning. Three different PEOm-b-PCLn block copolymers, with different molecular weights of PEO and PCL, were synthesized by ring opening polymerization of ε-caprolactone using PEO as initiator and stannous octoate as catalyst. The polymer blends were prepared by homogenous solvent mixing using dichloromethane for further electrospinning procedures. After electrospinning, it was found that the addition to PCL of the different block copolymers produced micron-fibers with smaller width, equal or higher hydrophilicity, lower Young modulus, and rougher surfaces, as compared with micron-fibers obtained only with PCL. Neural stem progenitor cells (NSPC), isolated from rat brains and grown as neurospheres, were cultured on the fibrous materials. Immunofluorescence assays showed that the NSPC are able to survive and even differentiate into astrocytes and neurons on the synthetic fibrous materials without any growth factor and using the fibers as guidance. Disassembling of the cells from the NSPC and acquisition of cell specific molecular markers and morphology progressed faster in the presence of the block copolymers, which suggests the role of the hydrophilic character and porous topology of the fiber mats.
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13
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Xue C, Wilson LD. A structural study of self-assembled chitosan-based sponge materials. Carbohydr Polym 2019; 206:685-693. [DOI: 10.1016/j.carbpol.2018.10.111] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 12/01/2022]
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14
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Diouf SIY, Williams DJ, Seifert S, Londoño-Calderon A, Pettes MT, Sheehan CJ, Firestone MA. Multi-stimuli responsive tetra-PPO60-PEO20 ethylene diamine block copolymer enables pH, temperature, and solvent regulation of Au nanoparticle composite plasmonic response. Polym Chem 2019. [DOI: 10.1039/c9py01098j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dynamic plasmonic tuning of Au NP organization through pH and temperature mediated polymer architecture transformation from lamellar to bicontinuous cubic.
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15
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Samanta P, Srivastava R, Nandan B. Confinement‐driven cocrystallization of binary polymer mixtures of different chain length in electrospun nanofibers. POLYMER CRYSTALLIZATION 2018. [DOI: 10.1002/pcr2.10017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Pratick Samanta
- Department of Textile TechnologyIndian Institute of Technology Delhi New Delhi Delhi India
| | - Rajiv Srivastava
- Department of Textile TechnologyIndian Institute of Technology Delhi New Delhi Delhi India
| | - Bhanu Nandan
- Department of Textile TechnologyIndian Institute of Technology Delhi New Delhi Delhi India
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16
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Wang H, Tang Y, Xia X, Lu Y. Role of poly(ethylene oxide) in copper-containing composite used for intrauterine contraceptive devices. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:92. [PMID: 29938314 DOI: 10.1007/s10856-018-6103-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 06/05/2018] [Indexed: 06/08/2023]
Abstract
Copper-containing composite is a cupric ions release system to prepare a novel copper intrauterine devices (Cu-IUDs), its biocompatibility and weight of the prepared composite Cu-IUDs are directly relevant to its such side-effects as pain and bleeding. To improve its biocompatibility and reduce its weight of such a composite Cu-IUDs, a copper-containing composite based on polymer alloy of poly(ethylene oxide) (PEO) and low-density polyethylene (LDPE) is developed. Here the role of its PEO in this novel cupric ions release system is reported. The results show that its cupric ions release rate can be adjusted easily by only changing its PEO content, and it increases remarkably with the increase of its PEO content. Our study also show that this influence is caused by the improvement of its hydrophilicity and the formation of its porous structure owing to the introduction of PEO. The improvement of its hydrophilicity make it easier for the surrounding aqueous solution to infiltrate into the composite, and the formation of its porous structure provide more routes for entry of the aqueous solution and diffusion of the released cupric ions. All these results indicate that the Cu/PEO/LDPE composite is a potential material that can be used to prepare such cupric ions release micro-devices as Cu-IUDs with slighter side-effects through its smaller weight.
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Affiliation(s)
- Huan Wang
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Ying Tang
- Institute of Chemical Materials, Chinese Academy of Engineering and Physics, Mianyang, Sichuan, 621900, China
| | - Xianping Xia
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
| | - Yi Lu
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
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17
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Samanta P, Srivastava R, Nandan B. Block copolymer compatibilization driven frustrated crystallization in electrospun nanofibers of polystyrene/poly(ethylene oxide) blends. RSC Adv 2018; 8:17989-18007. [PMID: 35542103 PMCID: PMC9080552 DOI: 10.1039/c8ra02391c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/08/2018] [Indexed: 11/21/2022] Open
Abstract
The confined crystallization behaviour of poly(ethylene oxide) (PEO) has been studied in electrospun nanofibers of the phase-separated blends of polystyrene (PS) and PEO compatibilized with polystyrene-block-poly(ethylene oxide) (PS-b-PEO) block copolymer. The PS was present as the majority component such that the electrospun nanofibers consisted of PEO domains dispersed in the PS matrix. The phase separation in the blend occurred under the radial constraint of the nanofibers which led to the formation of small-sized fibrillar PEO domains. The use of block copolymer compatibilizer resulted in a noticeable decrease in the PEO domain size in the as-spun nanofibers. Moreover, the decrease in the domain size and domain connectivity was more substantial in the thermally annealed blend nanofibers due to the suppression of the domain coalescence mechanism resulting from the localization of the PS-b-PEO block copolymer at the interface. Consequently, the fraction of PEO domains crystallizing via homogeneous nucleation increased in the compatibilized blend nanofibers due to the presence of higher number of heterogeneity free PEO domains and disruption in their spatial connectivity. Interestingly, in the compatibilized blend nanofibers consisting of low molecular weight PEO, additional crystallization event attributed to surface nucleation was observed. The surface nucleation, plausibly, resulted from the formation of wet-brush structures where the PEO homopolymers homogeneously wet the PEO blocks present at the interface. In such a scenario, the PEO crystallization occurred via surface nucleation at the domain interface. The surface nucleated crystallization was absent in the compatibilized blend nanofibers composed of high molecular weight PEO presumably due to the formation of morphology with dry-brush structures. Confined crystallization behaviour of poly(ethylene oxide) (PEO) was studied in electrospun nanofibers of the phase-separated blends of polystyrene (PS) and PEO compatibilized with polystyrene-block-poly(ethylene oxide) (PS-b-PEO) block copolymer.![]()
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Affiliation(s)
- Pratick Samanta
- Department of Textile Technology, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Rajiv Srivastava
- Department of Textile Technology, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Bhanu Nandan
- Department of Textile Technology, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
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18
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Zhang H, Xi S, Han Y, Liu L, Dong B, Zhang Z, Chen Q, Min W, Huang Q, Li Y, Liu J. Determining electrospun morphology from the properties of protein-polymer solutions. SOFT MATTER 2018; 14:3455-3462. [PMID: 29682643 DOI: 10.1039/c7sm02203d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Integrating natural macromolecules, e.g. proteins, is a progressive trend in the fabrication of biocompatible sub-micrometer fibers with tunable diameters using the electrospinning technique. The correlation between solution properties and electrospun morphology is critical; it is quite clear for synthetic linear polymer solutions but remains uncertain for solutions with protein. Here, we report the determination of electrospun morphology in protein-polymer solutions of poly(ethylene oxide) (PEO) and zein, a storage protein from corn. The viscosity of the zein/PEO mixed solutions can be well described using the Lederer-Roegiers equation and decreases with the increase of the fraction of zein. The surface tension sharply decreases above a critical concentration at the saturation of the interfacial monolayer. Correspondingly, the different electrospun morphologies-from bead, coexisting bead and fiber, to fiber and ribbon-were mapped onto a ternary phase diagram and a viscosity contour plot. Such coupling provides a clear way to determine the electrospun morphology from solution properties. The occurrence of electrospun fibers partially follows two empirical rules, while the critical point revealed from surface tension has the best approximation. The diameters of electrospun fibers were found to have a scaling relationship against concentration, zero-shear viscosity and surface tension of solutions. These scaling exponents were compared with those from typical polymer solutions. The analysis suggests that aqueous ethanol gives different solvent qualities to zein and PEO solutions, resulting in the irregular shape in the phase diagram that correlates solution properties and electrospun morphologies.
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Affiliation(s)
- Hao Zhang
- College of Food Science and Engineering, National Engineering Laboratory for Wheat and Corn Deep Processing, Jilin Agricultural University, Changchun, 130118, P. R. China.
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Li S, Wang H, Liu L, Xu H, Shi H. On the crystallization behavior of a poly(stearyl methacrylate) comb-like polymer inside a nanoscale environment. CrystEngComm 2018. [DOI: 10.1039/c8ce01378k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A “soft” or “hard” nanoscale template illustrates the confined processes of a poly(stearyl methylacrylate) comb-like polymer, indicating that reduced chain relaxation and mobility influence the crystallization behavior.
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Affiliation(s)
- Shuqin Li
- Tianjin Key Laboratory of Advanced Fibers and Energy Storage
- School of Material Science and Engineering
- Tianjin Polytechnic University
- Tianjin 300387
- China
| | - Haixia Wang
- Tianjin Key Laboratory of Advanced Fibers and Energy Storage
- School of Material Science and Engineering
- Tianjin Polytechnic University
- Tianjin 300387
- China
| | - Luntao Liu
- Tianjin Key Laboratory of Advanced Fibers and Energy Storage
- School of Material Science and Engineering
- Tianjin Polytechnic University
- Tianjin 300387
- China
| | - Hongxing Xu
- Tianjin Key Laboratory of Advanced Fibers and Energy Storage
- School of Material Science and Engineering
- Tianjin Polytechnic University
- Tianjin 300387
- China
| | - Haifeng Shi
- Tianjin Key Laboratory of Advanced Fibers and Energy Storage
- School of Material Science and Engineering
- Tianjin Polytechnic University
- Tianjin 300387
- China
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20
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Samanta P, Srivastava R, Nandan B, Chen HL. Crystallization behavior of crystalline/crystalline polymer blends under confinement in electrospun nanofibers of polystyrene/poly(ethylene oxide)/poly(ε-caprolactone) ternary mixtures. SOFT MATTER 2017; 13:1569-1582. [PMID: 28127604 DOI: 10.1039/c6sm02748b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have studied the crystallization behavior of crystalline/crystalline blends of poly(ethylene oxide) (PEO) and poly(ε-caprolactone) (PCL) in electrospun nanofibers fabricated from ternary blends of polystyrene (PS), PEO, and PCL, where PS was present as the majority component. It was demonstrated previously that PEO in PS/PEO binary blend nanofibers with a low PEO weight fraction (≦0.2) crystallized predominantly through homogenous nucleation due to the small PEO domain size which excluded the presence of heterogeneities (Soft Matter, 2016, 12, 5110). Here, it was found that PCL in PS/PCL binary blend nanofibers exhibited similar behavior, but at a much lower weight fraction of PCL (≦0.1) due to the presence of an inherently higher concentration of heterogeneities in the PCL homopolymer. In the PS/PEO/PCL ternary blend nanofibers, where the combined weight fraction of PEO and PCL was kept at 0.2 or less, the crystallization of the two components took place separately through both heterogeneous and homogenous nucleation mechanisms. The phase segregated crystallization behavior was further confirmed by the melting behavior of the blend nanofibers and wide angle X-ray diffraction (WAXD) measurements. Most significantly, the homogenous nucleation of both PEO and PCL was suppressed whereas the heterogeneous nucleation was enhanced in the ternary blend nanofibers even at very low weight fraction of PEO or PCL. This was plausibly attributed to the coupling between the crystallization and the liquid-liquid phase separation (LLPS) of the PEO/PCL mixture dispersed in the PS matrix during non-isothermal cooling of the blend nanofibers. Furthermore, it was observed that thermal treatment of the PS/PEO/PCL blend nanofibers above the glass transition temperature of PS further promoted the heterogeneous nucleation-initiated crystallization of PEO because of a complex interplay between Plateau-Rayleigh instability-induced domain breakup and its further coalescence and demixing within the PEO/PCL domains embedded in the PS matrix.
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Affiliation(s)
- Pratick Samanta
- Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Rajiv Srivastava
- Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Bhanu Nandan
- Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Hsin-Lung Chen
- Department of Chemical Engineering and Frontier Centre of Fundamental and Applied Sciences of Matters, National Tsing-Hua University, Hsinchu 30013, Taiwan.
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21
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Ying WB, Kim S, Lee MW, Go NY, Jung H, Ryu SG, Lee B, Lee KJ. Toward a detoxification fabric against nerve gas agents: guanidine-functionalized poly[2-(3-butenyl)-2-oxazoline]/Nylon-6,6 nanofibers. RSC Adv 2017. [DOI: 10.1039/c7ra01278k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A novel guanidine-functionalized polymer, poly[2-(3-butenyl)-2-oxazoline] (PBuOxz), has been co-electrospun with Nylon-6,6 to form fibers that could be used for the decontamination of chemical warfare agents (CWAs).
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Affiliation(s)
- Wu Bin Ying
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
| | - Sohee Kim
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
| | - Min Woo Lee
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
| | - Na Yeong Go
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
| | | | - Sam Gon Ryu
- Agency for Defense Development (ADD)
- Daejeon
- Korea
| | - Bumjae Lee
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
| | - Kyung Jin Lee
- Department of Applied Chemical Engineering
- College of Engineering
- Chungnam National University
- Daejeon 305–764
- Korea
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