结晶度
材料科学
层状结构
退火(玻璃)
聚合物
玻璃化转变
极限抗拉强度
相变
再结晶(地质)
结晶学
转变温度
晶体结构
高分子化学
化学工程
复合材料
化学
热力学
古生物学
物理
超导电性
量子力学
生物
工程类
作者
Ying Zheng,Jian Zhou,Yongzhong Bao,Guorong Shan,Pengju Pan
标识
DOI:10.1021/acs.jpcb.8b12111
摘要
Semicrystalline polymers usually undergo multilevel microstructural evolutions under high-temperature annealing and stretching deformation; this is essential to tailor the physical properties of polymer products in industrial processing. Here, we choose poly(p-dioxanone) (PPDO), a typical biodegradable, biocompatible, and bioresorbable polymer, as a model semicrystalline polymer and investigated its polymorphic structural transition and crystalline lamellar evolution under high-temperature annealing and stretching. High-temperature annealing caused the α′-to-α phase transition of PPDO, accompanied by the improvement of crystallinity (Xc) and thickening of crystalline lamellae. Tensile strength and Young's modulus of PPDO increased but the breaking strain decreased as the annealing temperature increased. Stretch-induced phase transition of PPDO depended strongly on the initial structure and stretching temperature (Ts). The α-form PPDO transformed into its α′ counterpart during stretching at low Ts. This phase transition was irreversible and did not retain the α form with the release of stress. However, no phase transition took place for the α-form PPDO stretched at high Ts (≥40 °C). Original lamellae of α-form PPDO changed into the fibrillar lamellae during stretching via the melt-recrystallization mechanism.
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