Tailoring the Crystallization Behavior and Mechanical Property of Poly(glycolic acid)by Self-nucleation

• 作者: Jia-Xuan Li De-Yu Niu Peng-Wu Xu Zhao-Yang Sun Wei-Jun Yang Yang Ji Pi-Ming Ma
• 来源期刊: 高分子科学（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: RESEARCH ARTICLES
• 页码范围: 365-372
• 页数: 8页
• 语种: 英文

摘要

Biocompostable poly(glycolic acid)(PGA)crystallizes slowly under fast cooling condition,leading to poor mechanical performance of the final products.In this work,a self-nucleation(SN)route was carried out to promote the crystallization of PGA by regulating only the thermal procedure without any extra nucleating agents.When self-nucleation temperature(Ts)decreased from 250℃to 227℃,the nuclei density was increased,and the non-isothermal crystallization temperature(Tc)of PGA was increased from 156℃to 197℃and the half-life time(t0.5)of isothermal crystallization at 207℃was decreased by 89％.Consequently,the tensile strength and the elongation at break of the PGA were increased by 12％and 189％,respectively.According to the change of Tc as a function of Ts,a three-stage temperature domain map(Domain Ⅰ,Ⅱand Ⅲ)was protracted and the viscoelastic behavior of the self-nucleation melt and the homogeneous melt was studied.The results indicated that interaction among PGA chains was remained in Domain Ⅱb,which can act as pre-ordered structure to accelerate the overall crystallization rate.This work utilizes a simple and effective SN method to regulate the crystallization behavior and the mechanical properties of PGA,which may broaden the application range of resulting materials.