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Virat G, Maiti KK, Amal Raj RB, Gowd EB. Impact of polymer chain packing and crystallization on the emission behavior of curcumin-embedded poly(L-lactide)s. SOFT MATTER 2023; 19:6671-6682. [PMID: 37609667 DOI: 10.1039/d3sm00853c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
The development of biodegradable and biocompatible fluorescent materials with tunable emission in the solid state has become increasingly relevant for smart packaging and biomedical applications. Molecular packing and conformations play a critical role in tuning the solid-state photophysical properties of fluorescent materials. In this work, tunable emission of bioactive curcumin was achieved through the manipulation of the crystallization conditions and the polymorphic form of covalently linked poly(L-lactide) in the curcumin-embedded poly(L-lactide) (curcumin-PLLA). In the melt-crystallized curcumin-PLLA, with the increase in the isothermal crystallization temperature, a bathochromic shift in the fluorescence of curcumin-PLLA was observed due to the change in the intramolecular conjugation length of curcumin. The change in the isothermal crystallization temperature of curcumin-PLLA resulted in the rotation of the terminal phenyl rings of curcumin with respect to the central keto-enol group due to the covalently linked helical PLLA chains. In addition, solvent-induced single crystals and a gel of curcumin-PLLA were prepared and the influence of the polymorphic form of PLLA on the emission behavior of curcumin-PLLA was investigated. The results suggest that the polymer chain packing, crystallization conditions, morphology, and polymorphic form could play an influential role in dictating the fluorescence properties of fluorophore-embedded polymers.
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Affiliation(s)
- G Virat
- Materials Science and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Kaustabh Kumar Maiti
- Chemical Sciences and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - R B Amal Raj
- Materials Science and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
| | - E Bhoje Gowd
- Materials Science and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
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2
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High surface area polymer films by co-crystallization with low-molecular-mass guest molecules. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Polydopamine-Coated Poly-Lactic Acid Aerogels as Scaffolds for Tissue Engineering Applications. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072137. [PMID: 35408538 PMCID: PMC9000627 DOI: 10.3390/molecules27072137] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/17/2022] [Accepted: 03/23/2022] [Indexed: 11/17/2022]
Abstract
Poly-L-lactic acid (PLLA) aerogel-based scaffolds were obtained from physical PLLA gels containing cyclopentanone (CPO) or methyl benzoate (BzOMe) molecules. An innovative single step method of solvent extraction, using supercritical CO2, was used to achieve cylindrical monolithic aerogels. The pore distribution and size, analyzed by SEM microscopy, were found to be related to the crystalline forms present in the physical nodes that hold the gels together, the stable α’-form and the metastable co-crystalline ε-form, detected in the PLLA/BzOMe and PLLA/CPO aerogels, respectively. A higher mechanical compressive strength was found for the PLLA/CPO aerogels, which exhibit a more homogenous porosity. In vitro biocompatibility tests also indicated that monolithic PLLA/CPO aerogels exhibited greater cell viability than PLLA/BzOMe aerogels. An improved biocompatibility of PLLA/CPO monolithic aerogels was finally observed by coating the surface of the aerogels with polydopamine (PDA) obtained by the in situ polymerization of dopamine (DA). The synergistic effect of biodegradable polyester (PLLA) and the biomimetic interface (PDA) makes this new 3D porous scaffold, with porosity and mechanical properties that are tunable based on the solvent used in the preparation process, attractive for tissue engineering applications.
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Infrared bands to distinguish amorphous, meso and crystalline phases of poly(lactide)s: Crystallization and phase transition pathways of amorphous, meso and co-crystal phases of poly(ʟ-lactide) in the heating process. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124495] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Stereocomplex formation and hierarchical structural changes during heating of supramolecular gels obtained by polylactide racemic blends. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124530] [Citation(s) in RCA: 3] [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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6
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Virat G, Gowd EB. Poly(l-lactide)s with tetraphenylethylene: role of polymer chain packing in aggregation-induced emission behavior of tetraphenylethylene. Polym Chem 2022. [DOI: 10.1039/d1py01539g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The AIE behavior of tetraphenylethylene in biocompatible poly(l-lactide)s is found to be sensitive to the polymer chain packing, polymer crystal structure, solvent, and temperature.
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Affiliation(s)
- G. Virat
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - E. Bhoje Gowd
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
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c-Perpendicular Orientation of Poly(ʟ-lactide) Films. Polymers (Basel) 2021; 13:polym13101572. [PMID: 34068379 PMCID: PMC8153587 DOI: 10.3390/polym13101572] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/07/2021] [Accepted: 05/11/2021] [Indexed: 12/02/2022] Open
Abstract
Poly(ʟ-lactide) (PLLA) films, even of high thickness, exhibiting co-crystalline and crystalline α phases with their chain axes preferentially perpendicular to the film plane (c⊥ orientation) have been obtained. This c⊥ orientation, unprecedented for PLLA films, can be achieved by the crystallization of amorphous films as induced by low-temperature sorption of molecules being suitable as guests of PLLA co-crystalline forms, such as N,N-dimethylformamide, cyclopentanone or 1,3-dioxolane. This kind of orientation is shown and quantified by two-dimensional wide-angle X-ray diffraction (2D-WAXD) patterns, as taken with the X-ray beam parallel to the film plane (EDGE patterns), which present all the hk0 arcs centered on the meridian. PLLA α-form films, as obtained by low-temperature guest-induced crystallization, also exhibit high transparency, being not far from those of the starting amorphous films.
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Ma B, Wang X, He Y, Dong Z, Zhang X, Chen X, Liu T. Effect of poly(lactic acid) crystallization on its mechanical and heat resistance performances. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123280] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Praveena NM, Nagarajan S, Gowd EB. Stereocomplexation of enantiomeric star-shaped poly(lactide)s with a chromophore core. CrystEngComm 2021. [DOI: 10.1039/d1ce00037c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Herein, we aim to investigate the influence of the cooling rate from the melt on stereocomplex formation of equimolar blends of enantiomeric star-shaped poly(lactide)s with a dipyridamole core.
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Affiliation(s)
- N. M. Praveena
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum 695 019
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Selvaraj Nagarajan
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum 695 019
- India
- Department of Chemical Engineering
| | - E. Bhoje Gowd
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum 695 019
- India
- Academy of Scientific and Innovative Research (AcSIR)
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Scalable Reaction-spinning of Rigid-rod Upilex-S® Type Polyimide Fiber with an Ultrahigh Tg. CHINESE JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1007/s10118-021-2508-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Zheng Y, Pan P. Crystallization of biodegradable and biobased polyesters: Polymorphism, cocrystallization, and structure-property relationship. Prog Polym Sci 2020. [DOI: 10.1016/j.progpolymsci.2020.101291] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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12
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Hsieh YT, Nozaki S, Kido M, Kamitani K, Kojio K, Takahara A. Crystal polymorphism of polylactide and its composites by X-ray diffraction study. Polym J 2020. [DOI: 10.1038/s41428-020-0343-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Rosely CVS, Shaiju P, Gowd EB. Poly(l-lactic acid)/Boron Nitride Nanocomposites: Influence of Boron Nitride Functionalization on the Properties of Poly(l-lactic acid). J Phys Chem B 2019; 123:8599-8609. [PMID: 31525982 DOI: 10.1021/acs.jpcb.9b07743] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Differently functionalized boron nitride nanosheets (BNNSs) [hydroxyl (OH_BNNSs), amine (NH2_BNNSs), and poly(ethylene glycol) (PEG) (PEG_BNNSs)] were synthesized, and their effects on the structure and thermal properties of poly(l-lactic acid) (PLLA) along with those of the pristine BNNSs were studied. Highly dispersed nanocomposites were prepared using PLLA and 0.5 wt % of pristine/functionalized BNNSs via a solvent blending method. Homogeneous dispersion of BNNSs in the polymer matrix was confirmed using X-ray diffraction and scanning electron microscopy. Pristine BNNSs and OH_BNNSs accelerated the crystallization of PLLA as effective nucleating agents and favored the formation of the α form in melt-crystallized samples. On the other hand, NH2_BNNSs and PEG_BNNSs incorporated samples result in the moderate crystallization rate of PLLA and lead to the formation of a mixture of α and α' forms similar to the PLLA. It is also found that thermal stability and thermal conductivity of PLLA nanocomposites significantly depend on the type of functionalization of BNNSs. At 0.5 wt % loading, the thermal conductivity enhancement is maximum for PEG_BNNSs incorporated PLLA (∼62%), and that is only 9% for pristine BNNSs incorporated PLLA. The thermal stability of PLLA nanocomposites was significantly improved by 32-41 °C depending on the type of functionalized BNNSs compared to PLLA. It is proposed that the strong interaction between functionalized BNNSs and PLLA matrix is responsible for the improved thermal management properties.
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Affiliation(s)
- C V Sijla Rosely
- Materials Science and Technology Division , CSIR-National Institute for Interdisciplinary Science and Technology , Trivandrum , 695 019 Kerala , India.,Academy of Scientific and Innovative Research , Ghaziabad , 201 002 Uttar Pradesh , India
| | - P Shaiju
- Materials Science and Technology Division , CSIR-National Institute for Interdisciplinary Science and Technology , Trivandrum , 695 019 Kerala , India
| | - E Bhoje Gowd
- Materials Science and Technology Division , CSIR-National Institute for Interdisciplinary Science and Technology , Trivandrum , 695 019 Kerala , India.,Academy of Scientific and Innovative Research , Ghaziabad , 201 002 Uttar Pradesh , India
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14
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Elevation of the flow temperature of gels formed by nano fibers of Poly(l-lactic acid) by surface crystallization induced by block copolymers. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Mete S, Goswami KG, Ksendzov E, Kostjuk SV, De P. Modulation of side chain crystallinity in alternating copolymers. Polym Chem 2019. [DOI: 10.1039/c9py01340g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A remarkable enhancement in crystalline melting temperature (Tm) was observed in a series of fatty acids and mPEG containing alternating copolymers with the lone increase in mPEG chain lengths.
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Affiliation(s)
- Sourav Mete
- Polymer Research Centre and Centre for Advanced Functional Materials
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur - 741246, Nadia
- India
| | - Krishna Gopal Goswami
- Polymer Research Centre and Centre for Advanced Functional Materials
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur - 741246, Nadia
- India
| | - Evgenii Ksendzov
- Research Institute for Physical Chemical Problems of the Belarusian State University
- Minsk
- Belarus
| | - Sergei V. Kostjuk
- Research Institute for Physical Chemical Problems of the Belarusian State University
- Minsk
- Belarus
- Sechenov First Moscow State Medical University
- Institute for Regenerative Medicine
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur - 741246, Nadia
- India
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16
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Kiersnowski A, Chrissopoulou K, Selter P, Chlebosz D, Hou B, Lieberwirth I, Honkimäki V, Mezger M, Anastasiadis SH, Hansen MR. Formation of Oriented Polar Crystals in Bulk Poly(vinylidene fluoride)/High-Aspect-Ratio Organoclay Nanocomposites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13375-13386. [PMID: 30350703 DOI: 10.1021/acs.langmuir.8b02412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We have investigated the formation of lamellar crystals of poly(vinylidene fluoride) (PVDF) in the presence of oriented clay particles with different aspect ratios (ARs) and surface properties. Hot-melt screw extrusion of PVDF with 5 wt % of montmorillonite (AR ≈ 12) or fluoromica (AR ≈ 27) resulted in formation of phase-separated blends. Replacing the clays with their organoclay derivatives, organomontmorillonite or organofluoromica, resulted in the corresponding intercalated nanocomposites. The organoclays induced formation of polar β- and γ-polymorphs of PVDF in contrast to the α-polymorph, which dominates in the pure PVDF and the PVDF/clay blends. Solid-state nuclear magnetic resonance revealed that the content of the α-phase in the nanocomposites was never higher than 7% of the total crystalline phase, whereas the β/γ mass ratio was close to 1:2, irrespective of the AR or crystallization conditions. X-ray diffraction showed that the oriented particles with a larger AR caused orientation of the polar lamellar crystals of PVDF. In the presence of the organofluoromica, PVDF formed a chevron-like lamellar nanostructure, where the polymer chains are extended along the extrusion direction, whereas the lamellar crystals were slanted from normal to the extrusion direction. Time-resolved X-ray diffraction experiments allowed the identification of the formation mechanism of the chevron-like nanostructure.
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Affiliation(s)
- Adam Kiersnowski
- Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany
- Faculty of Chemistry , Wroclaw University of Science and Technology , Wybrzeze Wyspianskiego 27 , 50-370 Wroclaw , Poland
| | - Kiriaki Chrissopoulou
- Institute of Electronic Structure and Laser , Foundation for Research and Technology-Hellas , P.O. Box 1527, 711 10 Heraklion , Crete , Greece
| | - Philipp Selter
- Institute of Physical Chemistry , Westfälische Wilhelms-Universität Münster , Corrensstr. 28/30 , D-48149 Münster , Germany
| | - Dorota Chlebosz
- Faculty of Chemistry , Wroclaw University of Science and Technology , Wybrzeze Wyspianskiego 27 , 50-370 Wroclaw , Poland
| | - Binyang Hou
- Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany
- Department of Chemistry and Physical Science , Mount Vernon Nazarene University , 800 Martinsburg Road , Mount Vernon , Ohio 43050 , United States
| | - Ingo Lieberwirth
- Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany
| | - Veijo Honkimäki
- European Synchrotron Radiation Facility, ESRF , 71 avenue des Martyrs , 38000 Grenoble , France
| | - Markus Mezger
- Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany
| | - Spiros H Anastasiadis
- Institute of Electronic Structure and Laser , Foundation for Research and Technology-Hellas , P.O. Box 1527, 711 10 Heraklion , Crete , Greece
- Department of Chemistry , University of Crete , P.O. Box 2208, 710 03 Heraklion , Crete , Greece
| | - Michael Ryan Hansen
- Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany
- Institute of Physical Chemistry , Westfälische Wilhelms-Universität Münster , Corrensstr. 28/30 , D-48149 Münster , Germany
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Mani MR, Gebrekrstos A, Madras G, Pötschke P, Bose S. PVDF-MWNT interactions control process induced β-lamellar morphology and orientation in the nanocomposites. Phys Chem Chem Phys 2018; 20:24821-24831. [PMID: 30229767 DOI: 10.1039/c8cp03739f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of methylene blue (MB) modified multiwall carbon nanotubes (MWNTs) on the nucleation and morphology of polyvinylidene fluoride (PVDF) in comparison with the effect of MWNTs was systematically assessed by DSC, 13C NMR, FT-IR, TEM, WAXS and SAXS analysis. TEM analysis of ultra-microtomed samples revealed that MB modification enhanced the dispersibility of MWNTs in PVDF. Further, the nanocomposites were subjected to mechanical rolling and the synergistic effect of processing and fillers on the PVDF morphology (before and after rolling) at different length scales was studied. Both FT-IR and WAXS analyses suggested that mechanical rolling transforms α-PVDF to β-PVDF (ca. 88%). TEM and two-dimensional WAXS analyses revealed that the MWNTs and β-crystallites are oriented preferentially along the rolling direction and the degree of orientation is not influenced by the fillers suggesting that crystallite orientation is fully controlled by mechanical rolling. On the other hand, β-lamellae showed perpendicular orientation with respect to the rolling direction. Unlike β-crystallites, the β-lamellar morphology and orientation are highly governed by the fillers as evident from SAXS analysis. Using MWNTs and the MWNT-MB π-complex, we demonstrate that the β-lamellar morphology and degree of orientation are controlled by the extent of interaction of fillers with PVDF. Interestingly, both β-lamellar morphology and degree of orientation correlate well with the mechanical properties of the rolled PVDF. More specifically, the dynamic storage modulus of the samples in the rolling direction increases with increasing β-lamellar morphology and degree of orientation. The present work demonstrates that the polymer-filler interaction plays a crucial role in regulating the processed polymer morphology and can be tuned by appropriately modifying the surface of fillers through either covalent or non-covalent interactions.
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Affiliation(s)
- Mohan Raj Mani
- Department of Materials Engineering, Institute of Science, Bangalore 560012, India.
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18
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Nagarajan S, Hu J, Wu H, Duan Y, Zhang J. Study on phase transition behavior and lamellar orientation of uniaxially stretched poly(ʟ-lactide) / cellulose nanocrystal-graft-poly(d-lactide) blend. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.07.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Rosely CVS, Nagendra B, Sivaprasad VP, Gowd EB. Influence of Boron Nitride Nanosheets on the Crystallization and Polymorphism of Poly(l-lactide). J Phys Chem B 2018; 122:6442-6451. [DOI: 10.1021/acs.jpcb.8b03211] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. V. Sijla Rosely
- Materials Science and Technology Division, CSIR−National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 001, India
| | - Baku Nagendra
- Materials Science and Technology Division, CSIR−National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 001, India
| | - Vijayan Pillai Sivaprasad
- Materials Science and Technology Division, CSIR−National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
| | - E. Bhoje Gowd
- Materials Science and Technology Division, CSIR−National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 001, India
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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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Matsuda Y, Ashizawa H, Fukui T, Akao R, Tasaka S. Fabrication of Polymer Structure among Fibrous Structure of Poly(lactic acid) Gel and Improvement of Physical Properties. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201700317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | - Ryo Akao
- 3-5-1 Johoku; Naka-ku Hamamatsu 432-8561 Japan
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23
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Elevation of flow temperature of poly(l-lactic acid) gel by controlling its morphology and crystal form. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-1958-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Interplay of microphase separation, crystallization and liquid crystalline ordering in crystalline/liquid crystalline block copolymers. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.09.071] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Nagarajan S, Gowd EB. Star-Shaped Poly(l-lactide) with a Dipyridamole Core: Role of Polymer Chain Packing on Induced Circular Dichroism and Photophysical Properties of Dipyridamole. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01144] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Selvaraj Nagarajan
- Materials Science and Technology
Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
| | - E. Bhoje Gowd
- Materials Science and Technology
Division CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
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26
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Nagarajan S, Deepthi K, Gowd EB. Structural evolution of poly(l-lactide) block upon heating of the glassy ABA triblock copolymers containing poly(l-lactide) A blocks. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.06.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Lan Q, Li Y. Mesophase-Mediated Crystallization of Poly(l-lactide): Deterministic Pathways to Nanostructured Morphology and Superstructure Control. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01442] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Qiaofeng Lan
- Ningbo Institute of Materials
Technology and Engineering, Chinese Academy of Sciences (CAS), Ningbo 315201, China
| | - Yong Li
- Ningbo Institute of Materials
Technology and Engineering, Chinese Academy of Sciences (CAS), Ningbo 315201, China
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Yu C, Bao J, Xie Q, Shan G, Bao Y, Pan P. Crystallization behavior and crystalline structural changes of poly(glycolic acid) investigated via temperature-variable WAXD and FTIR analysis. CrystEngComm 2016. [DOI: 10.1039/c6ce01623e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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