线形高分子共混熔体的平衡态性质

Equilibrium properties of linear polymer blends

采用分子动力学模拟的方法研究了长短链二元线形高分子共混熔体在平衡态下的结构、动力学性质以及黏度.结果表明:共混对组分的结构性质没有影响,共混体系中2组分各自的均方回转半径以及均方末端距均与单分散体系中相同;共混显著地影响动力学性质,即长链在共混体系中的扩散和松弛会加快,相反,短链的扩散和松弛则会变慢;另外,该共混体系的黏度符合简单的线性叠加.

By the means of molecular dynamics simulation, the structural, dynamical and viscous properties of binary blends of short and long linear chains have been investigated. Our results show that in blends the structural properties for each component keep unchanged, when compared with those in monodisperse system. Meanwhile, the dynamical properties are affected dramatically, namely, the dynamics for long chains is accelerated and that for short chains is hindered. In addition, the viscosity of blends can be described by a linear accumulation for the viscosity of each component.