Key Laboratory for Polymer Composite and Functional Materials of the Ministry of Education, DSAPM Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.
J Phys Chem B. 2010 Jan 28;114(3):1301-6. doi: 10.1021/jp909925v.
The resonance light scattering (RLS) technique based on a conventional fluorescence spectrophotometer was used to quantitatively describe the aggregation and dissociation of polystyrene (PS) in cyclohexane solution during cyclic heating and cooling. Transitions in conformation of PS molecules and aggregation of PS chains in the course of phase separation were revealed. The results indicated that PS chains changed from random coils to collapsed globules and then aggregated when temperature decreased. In contrast, when the system is heated, the chain aggregates were initially swelled and followed by gradual dissociation. Subsequently, the conformation of PS chains returned to the original state. Kinetics of phase separation of the PS solution was analyzed, which allowed estimation of the apparent activation energy.
基于常规荧光分光光度计的共振光散射（RLS）技术被用于定量描述聚苯乙烯（PS）在环己烷溶液中循环加热和冷却过程中的聚集和解离。揭示了 PS 分子构象转变和相分离过程中 PS 链的聚集。结果表明，当温度降低时，PS 链从无规线团转变为塌陷的球状物，然后聚集。相反，当体系加热时，链聚集物首先溶胀，然后逐渐解离。随后，PS 链的构象恢复到原始状态。分析了 PS 溶液的相分离动力学，这允许估计表观活化能。
