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.

The Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,Jiangnan University,Wuxi 214122,China;Inner Mongolia Pujing Polymer Material Technology Corporation Ltd.,Baotou 014060,China

[1]Jia-Xuan Li;De-Yu Niu;Peng-Wu Xu;Zhao-Yang Sun;Wei-Jun Yang;Yang Ji;Pi-Ming Ma-.Tailoring the Crystallization Behavior and Mechanical Property of Poly(glycolic acid)by Self-nucleation)[J].高分子科学（英文版）,2022(04):365-372

Biocompostable

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