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聚乳酸玻璃化转变行为的分子模拟 被引量:3

Molecular Dynamic Simulation on the Glass Transition Properties of PLA
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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.
出处 《材料导报(纳米与新材料专辑)》 EI 2009年第2期288-290,共3页
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
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