摘要
采用等温等压(NPT)正则系综,用分子动力学方法研究了聚乳酸的玻璃化转变行为,获得了玻璃化转变温度。在230~440K范围内,通过模拟体系的密度、比体积及相关径向分布函数等参数,最终确定了聚乳酸的玻璃化温度,模拟计算的结果与实验值吻合。
The glass transition temperature(Tg) of polylactic acid(PLA) is determined by isothermal-isobaric molecular dynamic simulation(NPT-MD). The software package discover in materials studio with the condensed-phase optimized molecular potential for atomistic simulation study(COMPASS) is used for the simulation. The state parameters of density(ρ), specific volume(Vspecific) and radial distribution function(rdf) are obtained by NPT-MD at the temperature range of 230-440K and the Tg values are determined. The results of molecular dynamic simulation(MDS) agree very well with experimental values.
基金
国家自然科学基金(20603030)
鲁东大学创新团队基金(08-CXA001)
关键词
分子动力学
玻璃化转变
聚乳酸
径向分布函数
molecular dynamic simulation, glass transition temperature, polylaetic acid, radial distribution function