Chain Mobility in Different Polymers

Wypych, George

doi:10.1016/b978-1-927885-65-9.50010-7

Cited by 2 publications

(2 citation statements)

References 177 publications

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“…The filler affects the microstructure of the polymer by changing its free volume and segmental motions. , Such behavior can be assessed by measuring the spin–lattice relaxation time ( T 1 ) determined by high-resolution solid-state cross-polarization magic angle spinning (CP-MAS) 13 C-NMR spectroscopy. The T 1 value provides molecular motion information; it reveals the time required for a nuclear spin to return to its ground state.…”

Section: Resultsmentioning

confidence: 96%

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Thanh

Hào

Cho

et al. 2022

ACS Sustainable Chem. Eng.

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Plastic waste accumulation is a current societal crisis. Although replacing nondegradable plastics with biodegradable alternatives is one solution to this problem, conventional biodegradable plastics have low mechanical performance and require fastidious decomposition conditions. Consequently, fulfilling the industrial requirements of processability, end-use applicability, and post-use biodegradability is difficult. Therefore, integrating mechanical robustness and enhanced degradability into a single material is critical. Herein, we introduce a fully biomass-derived poly(butylene adipate-co-furanoate) (PBAF) composite with sulfated chitin nanowhiskers prepared by in situ polymerization. This approach efficiently disperses the nanofiller in the polymer matrix and creates beneficial interactions between the nanofiller and the furan rings of the polymer, resulting in excellent material properties. A PBAF composite film loaded with 0.1 wt % nanofiller is as strong as a nondegradable engineering plastic (i.e., poly(ethylene terephthalate)) and exhibits higher tensile strength (1.6-fold), tear toughness (1.4-fold), and degradation rate (1.7-fold) than neat PBAF. A structure–performance relationship study revealed that the nanofiller is accommodated close to the furan rings of the polymer, which results in noticeable segmental mobility and structural change, whereas the benzene rings of conventional poly(butylene adipate-co-terephthalate) show negligible change due to its sturdy crystalline phase. The developed all-organic composite is a sustainable alternative to conventional plastics.

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Section: Resultsmentioning

confidence: 96%

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Thanh

Hào

Cho

et al. 2022

ACS Sustainable Chem. Eng.

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“…Fragmentation of the crystal blocks continues; at medium temperatures (80 and 110 °C), and the broken crystal blocks remain stable. In the amorphous region, the unfolded chains and disentangled chains crystallize into crystal blocks with crystal sizes almost identical to the original broken ones ; [ 86,169–171 ] at high temperatures (130 and 140 °C), not only the unfolded chains and disentangled chains in amorphous region crystallize into crystal blocks. Also, the small broken crystal blocks melt, and on recrystallization, new crystal blocks form with larger crystal sizes than those of the original broken ones.…”

Section: The Evolution Of Microstructure and Characterization Of A Si...mentioning

confidence: 99%

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Sharaf,

Kloczkowski

2023

Macro Chemistry & Physics

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Isotactic polypropylene (iPP) is a frequently used polymer in industrial processing and scientific research, used as a model material. This review highlights some current and forefront issues in polymer science and engineering. This review alludes to classical deformation schemes to interpret the complicated deformation in isotactic polypropylene as a semicrystalline polymer. Also, due to the complex hierarchical structures of crystallized polymers, we are concerned mainly with the progress on the multi‐scale and multi‐stage microstructural evolution covering each deformation stage from the initiation of plasticity until failure, particularly in terms of crystalline morphology changes. Specifically, the characterization of the microstructure evolution of a single spherulite, lamella, and chain of isotactic polypropylene will be emphasized and mentioned. Here, we are most interested in the results obtained from stretching (strain‐induced) orientation and crystallization studies accompanied by the in situ scattering and spectroscopy techniques offering a detection window from nano to micrometer scale, which should be able to reflect the microstructural changes at different length scales of interest.During polymer processing, the melts are frequently subjected to shear or/and elongation flow fields, producing flow‐induced molecular chain orientation in the melt. The oriented molecular chains crystallize differently than those encountered under quiescent conditions. Thus, orientation‐induced crystallization has long been an object of intense interest. A vast body of research was reported about the effects of preorientation on the crystallization of various polymers. Among them, iPP is most frequently studied since its diversified structure and morphology are very sensitive to changes in processing conditions and molecular parameters.This article is protected by copyright. All rights reserved

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Chain Mobility in Different Polymers

Cited by 2 publications

References 177 publications

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

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