摘要
本文用光子相关光谱技术研究了聚苯乙烯-二乙烯基苯(PSt-DVB)共聚超微粒的溶液性质.该微粒的浓度涨落时间相关函数在波矢为q时,有指数衰减形式,其衰减速率г=q^2D_t.在精确的实验误差范围内,衰减速率的变化率为零。用累积量方法解析散射场的一阶时间相关方程,得到了作为浓度和温度函数的微粒扩散常数.与流体办学方程结合,计算出了微粒的流体力学尺寸.通过实验也确定了微粒在良溶剂中的分子形态.
The solution properties for Poly(styrene-divinylbenzene) (PSt-DVB) in toluene and cyclo-hexane have been studied by photon correlation spectroscopy. The time correlation function of concentration fluctuation for PSt-DVB having wave vector q is proved to have the form of an exponential decay. The average decay rate is given by г= q2D. The variant rate of decay rate is zero within thhe accuracy errors. The first time correlation function of scattering field was analyzed by the method of cumulant. We obtained the diffusion coefficient of PSt-DVB particle as a function of the concentration and tempera ure. The hydrodynamic radii for the particle in the good solvent, and the theta solvent, were calculated by means of Stokes-Einstein equation. The molecular morphology for PSt-DVB particle in solution was also studied.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1993年第2期201-205,共5页
Acta Polymerica Sinica
基金
国家自然科学基金
关键词
高聚物
苯乙烯
二乙烯基苯
Quasi-elastic light scattering, Photon correlation spectroscopy, PSt-DVB particle, Molecular diffusion