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Polyethylene oxide enhances the ductility and toughness of polylactic acid: the role of mesophase.
Soft Matter. 2020 Aug 14; 16(30):7018-7032.SM

Abstract

A lack of understanding of the structure-property relationship of the polylactic acid (PLA)-based polymer composite system makes it a challenge to manufacture products with optimized mechanical performance by precisely regulating the microscopic structure and morphology. Herein, we chose the PLA/polyethylene oxide (PEO) blend as a model to investigate the structural reason for the enhanced ductility and toughness of this kind of material. We have demonstrated that a considerable amount of the PLA mesophases exist in the melt quenched films that display high ductility and toughness, in contrast to the PLA crystals in their counterparts of slowly cooled films that are dominated by brittle fracture. The mesophase formed by melt quenching is attributed to a moderate acceleration of PLA chain mobility due to the plasticizing effect of the flexible PEO. In situ experiments have revealed the further formation of oriented mesophases induced by tensile deformation, which presents a high consistency between the content increase and the tensile stress intensification. We illustrate that the mesophases directly develop into a microfibrillar morphology to transmit the external stress and prevent crack propagation under deformation. This work emphasizes the essential role of the PLA mesophase in acquiring the enhanced ductility and toughness of the PLA/PEO composite films, which may be generalized to other similar PLA-based polymer composite materials.

Authors+Show Affiliations

National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, 450002, China. wangz@zzu.edu.cn.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32648874

Citation

Wang, Zhen, et al. "Polyethylene Oxide Enhances the Ductility and Toughness of Polylactic Acid: the Role of Mesophase." Soft Matter, vol. 16, no. 30, 2020, pp. 7018-7032.
Wang Z, Zhang C, Zhang Z, et al. Polyethylene oxide enhances the ductility and toughness of polylactic acid: the role of mesophase. Soft Matter. 2020;16(30):7018-7032.
Wang, Z., Zhang, C., Zhang, Z., Chen, X., Wang, X., Wen, M., Chen, B., Cao, W., & Liu, C. (2020). Polyethylene oxide enhances the ductility and toughness of polylactic acid: the role of mesophase. Soft Matter, 16(30), 7018-7032. https://doi.org/10.1039/d0sm00671h
Wang Z, et al. Polyethylene Oxide Enhances the Ductility and Toughness of Polylactic Acid: the Role of Mesophase. Soft Matter. 2020 Aug 14;16(30):7018-7032. PubMed PMID: 32648874.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Polyethylene oxide enhances the ductility and toughness of polylactic acid: the role of mesophase. AU - Wang,Zhen, AU - Zhang,Chuang, AU - Zhang,Zhen, AU - Chen,Xin, AU - Wang,Xiaohui, AU - Wen,Mingjie, AU - Chen,Bin, AU - Cao,Wei, AU - Liu,Chuntai, Y1 - 2020/07/10/ PY - 2020/7/11/pubmed PY - 2020/7/11/medline PY - 2020/7/11/entrez SP - 7018 EP - 7032 JF - Soft matter JO - Soft Matter VL - 16 IS - 30 N2 - A lack of understanding of the structure-property relationship of the polylactic acid (PLA)-based polymer composite system makes it a challenge to manufacture products with optimized mechanical performance by precisely regulating the microscopic structure and morphology. Herein, we chose the PLA/polyethylene oxide (PEO) blend as a model to investigate the structural reason for the enhanced ductility and toughness of this kind of material. We have demonstrated that a considerable amount of the PLA mesophases exist in the melt quenched films that display high ductility and toughness, in contrast to the PLA crystals in their counterparts of slowly cooled films that are dominated by brittle fracture. The mesophase formed by melt quenching is attributed to a moderate acceleration of PLA chain mobility due to the plasticizing effect of the flexible PEO. In situ experiments have revealed the further formation of oriented mesophases induced by tensile deformation, which presents a high consistency between the content increase and the tensile stress intensification. We illustrate that the mesophases directly develop into a microfibrillar morphology to transmit the external stress and prevent crack propagation under deformation. This work emphasizes the essential role of the PLA mesophase in acquiring the enhanced ductility and toughness of the PLA/PEO composite films, which may be generalized to other similar PLA-based polymer composite materials. SN - 1744-6848 UR - https://www.unboundmedicine.com/medline/citation/32648874/Polyethylene_oxide_enhances_the_ductility_and_toughness_of_polylactic_acid:_the_role_of_mesophase L2 - https://doi.org/10.1039/d0sm00671h DB - PRIME DP - Unbound Medicine ER -
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