摘要
对等规、间规、无规三种不同聚丙烯(PP)的玻璃化转变温度进行了分子动力学模拟。用分子动力学模拟来获得不同构型聚丙烯在不同温度下的特征体积,通过对模拟得到的体积-温度(V-T)作图,求得玻璃化转变温度,其模拟结果与实验值吻合得较好。同时分析了聚丙烯主链柔顺性、立构规整度和力场能量项对PP玻璃化转变温度的影响,模拟结果表明,二面角扭转能和非键能在玻璃化转变温度附近出现拐点,这是高分子出现玻璃化转变的主要根源。
Molecular dynamics methods have been used to investigate the glass transition of three different configuration of polypropylene(isotactic,syndiotactic,atactic).The glass transition temperature has been determined as the temperature marking the discontinuity in slope of the volume-temperature(V-T) simulation data in constant-pressure,constant-temperature(NPT) molecular dynamics simulation.There was reasonable agreement between experimental results and values of glass transition temperature(Tg) obtained from the simulations.The effects of chain flexibility,tacticity and energy components on the glass transition of polypropylene(PP) also been investigated,the simulation results show that the dihedral torsion energy and nobond energy curve appear inflection point at the glass transition temperature
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第10期53-56,共4页
Polymer Materials Science & Engineering
基金
国防973项目(61338)资助
中北大学青年科学基金
山西省研究生优秀创新项目
关键词
聚丙烯
分子动力学模拟
玻璃化转变温度
分子力场
polypropylene
molecular dynamics simulations
glass transition temperature
force field