Robust Poly(glycolic acid) Films with Crystal Orientation and Reinforcement of Chain Entanglement Network

被引:11
作者
Niu, De-Yu [1 ]
Xu, Peng-Wu [1 ]
Xu, Si-Jie [1 ]
Li, Jia-Xuan [1 ]
Yang, Wei-Jun [1 ]
Ma, Pi-Ming [1 ]
机构
[1] Jiangnan Univ, Key Lab Synthet & Biol Colloids, Minist Educ, Wuxi 214122, Peoples R China
基金
中国国家自然科学基金;
关键词
Poly(glycolic acid); Uniaxial stretching; Ductility; Strength; MECHANICAL-PROPERTIES; HIGH-PERFORMANCE; STRESS; POLY(ETHYLENE-TEREPHTHALATE); CRYSTALLIZATION; NANOCOMPOSITES; REJUVENATION; POLYSTYRENE; MESOPHASE; TOUGHNESS;
D O I
10.1007/s10118-023-2894-6
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The inherent brittleness of biodegradable poly(glycolic acid) (PGA) restricts its utilization in the packaging field. Traditional toughening methods usually require additional components accompanied by a sacrifice of strength. In the present work, PGA films with simultaneously enhanced strength and ductility are achieved via "casting-stretching-annealing " technology. The reinforced chain entanglement network of PGA induced by the intense extensional stress and the highly oriented crystals grown and refined during the stretching and annealing process endowed the improved ductility and strength of the PGA films, respectively. The relationships among the stretching process, microstructure and mechanical properties of the PGA films have been systematically investigated. As a result, the PGA film (SA-2) with low stretch ratios exhibits excellent ductility with an increase in elongation at break from 22% to 220% and tensile strength from 56 MPa to 130 MPa. Meanwhile, the PGA film (SA-4) with large stretch ratios features much higher tensile strength (335 MPa) while maintaining good ductility (elongation at break of 66%). In addition, highly oriented crystals result in obvious enhancement of heat resistance and dimensional stability of the PGA films. Therefore, this work provides an effective route to fabricate PGA films with both high strength and ductility which may promote the application of PGA materials.
引用
收藏
页码:1093 / 1103
页数:11
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