非共价键合杂化体系中聚己内酯的非等温结晶动力学

Nonisothermal Crystallization Kinetics of Poly(ε-caprolactone) in Non-covalently Coupled Hybrid Materials

运用差示扫描量热法(DSC)分析研究了聚己内酯(PCL)结晶高分子在新型PCL/S iO2非共价键合有机-无机杂化体系中的非等温结晶动力学特性。结果显示,杂化体系中PCL非等温结晶的成核和生长机制与杂化材料的组成和结构微环境效应相关。在相同结晶度下,m(TEOS)∶m(PCL)=60∶40杂化样品的F(T)值为7.42 K.m inn/(m-1),结晶速率最大。其非等温结晶动力学行为受无机纳米S iO2的成核加速作用的影响,也受杂化体系分子间氢键键合作用及无机非晶组分抑制结晶的影响。

The nonisothermal crystallization kinetics of poly （ε-caprolactone） （PCL） in PCL/silica （ SiO2 ） non-covalently coupled organic-inorganic hybrids was investigated by means of differential scanning calorimetry （DSC）. The results show that the mechanism of the nucleation and growth of the PCL nonisothermal crystallization in the hybrids are related to the composition of the hybrids and their structural micro-environmental effect. Under the same crystallinity, the F（T） value of a 60：40（ mass fraction） TEOS/PCL hybrid sample was 7.42 K· min^n/（m-1）, whose crystallization rate was the highest. On the one hand, the inorganic nano-component （ viz. SiO2） could act as a nucleating agent to facilitate the crystallization of PCL in the hybrids. On the other hand, the intermolecular hydrogen bonding and the Si02 network in the hybrids also confine the crystallization of PCL.