Study on Coil-Globule Transition of Polymer Measured by Luminescent Probe Method

(1)高分子线团-小球转变的理论研究（一）根据物理和化学作用的不同，将高分子线团-小球转变的内塌缩过程分为五种类型。（a）货车力（B）饱和化学键（c）链段与溶剂之间的亲和力（d）库仑力（e）拓扑相互作用（B）理论上发现，聚合物诱导的线团-小球转变开始于加入聚合物的重叠浓度之前。(C)通过计算机模拟，从理论上阐明了不同温度下球状聚合物的密度分布特征。(2)聚合物标记发色团的合成（3）POE诱导的聚苯乙烯的线团-球转变（A）测量了POE体积分数与蒽基聚合物的表观平均转动弛豫时间的关系。很明显，蒽基的表观平均转动弛豫时间在55-60%POE时急剧增加。(B)测量了POE体积分数与自猝灭速率的关系。当POE含量为50%时，聚苯乙烯发生了线团-小球转变。

(1) Theoritical Study on Coil-Globule Transition of Polymer(A) The inner collapsed processes of the coil-globule transition of polymer are classified as five type with the physical and chemical forces. (a)van der Waals force (b)saturating chemical bonds (c)affinity between segment and solvent (d)Coulomb force (e)topological interaction(B) It is found out theoritically that the polymer-induced coil-globule transition begin before the overlap concentration of added polymer.(C) The characteristics of density distribution in globule polymer at various temperatures are theoritical clarified by a computer simulation.(2) Synthesis of Polymer labeled chromophores(3) POE-Induced Coil-Globule Transition of Polystyrene(A) The dependence of volume fraction of POE on the apparent mean rotational relaxation time of anthryl groups attached polymer is measured. It is clear that the apparent mean rotational relaxation time of the anthryl group sharply increases at 55-60%POE.(B) The dependence of volume fraction of POE on the rate of self-quenching is measured. The coil-globule transition of polystyrene is caused at 50%POE.