Materials Reports 2019, Vol. 33 Issue (Z2): 590-598 |
POLYMERS AND POLYMER MATRIX COMPOSITES |
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Research Progress of Elastomer Blended Modified Poly (Lactic Acid) (PLA)High Toughness Blends |
ZHAO Xipo, HU Huan, XIONG Juan, WANG Xin, YU Xiaolei, PENG Shaoxian
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Collaborative Innovation Center of Green Light-weight Materials and Processing, Hubei Provincial Key Laboratory of Green Materials for Light Industry, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068 |
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Abstract Poly (lactic acid) (PLA) is one of the most promising bio-based degradable materials. Its excellent mechanical properties, good plasticity and biocompatibility make it have great application potential in packaging, clothing and medicine, but PLA inherent brittleness and low impact toughness limit its range of applications. In the past ten years, many scholars have carried out a lot of research on the toughening modification of PLA. The main modification methods are compounding, copolymerization, plasticizing and blending. Composite modification refers to the addition of fibers such as fibers, modified carbon nanotubes (MWCHNTs), chitosan (Ch), and modified titanium dioxide (TiO2) to the PLA. The fillers form a physical crosslink with PLA to enhance strength and toughness, but the adhesion and dispersion between the filler and the matrix is a difficult problem to be solved. Copolymerization modification refers to the introduction of flexible molecular chains such as polyethylene glycol (PEG), polycaprolactone (PCL), glycidyl methacrylate (GMA), and polyricin oil (PCO) onto the PLA chain these copolymers reduce the molecular chain regularity and crystallinity of the PLA,the toughness is improved significantly, but the high cost, serious pollution and complexity reaction process cannot meet the needs of the actual application. Plasticization modification refers to the addition of small molecular substances such as citrate, glyceryl ester, polyethylene glycol (PEG), lactic acid and lactate to PLA, which can enhance the mobility of PLA molecular chains, and the elongation at break is greatly increased, but the phenomenon of plasticizer migration is still to be resolved. Blending modification is to blend PLA with flexible polymers such as rubber particles or thermoplastic elastomers. When the flexible polymer component absorbs energy during shear debonding or deformation, the toughness of PLA is greatly improved. Among them, the thermoplastic elastomer has better processability than rubber particles, and the toughening effect on PLA is better, which is the focus of PLA toughening modification research. In this paper, the research progress of petroleum-based thermoplastic elastomers and bio-based/degradable elastomers toughened modified PLA is summarized. The principles and methods of toughening modification are introduced from the aspects of physical blending and reactive blending. The effects of the morphology of the blend phase and the interfacial entanglement on the properties of the blend were analyzed. Reactive blending and dynamic vulcanization process are beneficial to in-situ compatibilization in the blending process and are an effective way to prepare high toughness PLA/elastomer blends. The main methods and channels for bio-based/biodegradable elastomer toughened PLA to prepare high-toughness bio-based/biodegradable PLA blends are described in detail. Bio-based/degradable elastomers are an emerging direction for elastomer-toughened PLA and have important research value.
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Published: 25 November 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51273060), Key Project of Hubei Provincial Department of Education (D20181404, D20111407), Open fund of Hubei Key Laboratory of Green Light Industry Materials. |
About author:: Xipo Zhao received his B.S. and M.S. degrees in Chemistry from Hubei University of Technology in 2006, received his Ph.D. degree from College of Che-mistry and Molecular Sciences, Wuhan University in 2017. He is currently a professor of Hubei Provincial Key Laboratory of Green Light Industry Materials, Hubei University of echnology and mainly focus on the high-performance and functionalization of environmentally friendly polymer materials. He presided over and participated in the National Natural Science Foundation, the National Deve-lopment and Reform Commission project, the SME Innovation Fund of the Ministry of Science and Technology, and the provincial key scientific and technological projects, and published more than 40 academic papers and applied for 13 national invention patents. Shaoxian Peng, master student of Sichuan University, professor, member of the Materials Teaching Steering Committee of the Ministry of Education, second person of the New Century High-level Talent Project of Hubei Province, member of the National Natural Science Foundation of China, member of the Processing Committee of China Plastics Association, Hubei Province Executive Drector of the Fifth Council of the Materials Society and Director of the Modification Committee of the China Plastics Association. He is the key discipline leader of the Department of Polymer Materials Forming in Hubei Province and the head of the brand of polymer materials and engineering in Hubei Province and the director of Hubei Provincial Chemistry Teaching Demonstration Center. He is a member of the editorial board of the Journal of Hubei University of Technology (Natural Science Edition), Hubei Paper, and the first batch of experts of the Experts and Education Committee of the Packaging Technology Association of Hubei Province. He has undertaken 9 national-level scientific research projects (including 5 national natural science funds); 10 provincial and ministerial level; more than 30 horizontal scientific research projects; 11 identification results; more than 100 scientific research papers. |
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