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用GPC-LALLS等方法对环型聚苯乙烯进行了系统的表征。环型聚苯乙烯(RPS)是由两端具有活性基团的线型聚苯乙烯通过环化反应制备的,分子量由3×10~4至2.7×10~5。结果表明在θ溶剂和良溶剂中RPS与线型聚苯乙烯(LPS)特性粘数之比g(=[η]_r/[η]_1)分别约为0.63和0.65;RPS与LPS无扰均方回转半径之比(or/ol)为0.55—0.59,两者都与大环的理论值相近。实验结果还表明环型高分子符合GPC普适标定原理,此外,求出了RPS在环已烷,甲苯和四氢呋喃溶液中的粘度-分子量方程。
Cyclic polystyrene was systematically characterized by GPC-LALLS and other methods. Ring-shaped polystyrene (RPS) is prepared by cyclization of a linear polystyrene having reactive groups at both ends and has a molecular weight of 3x10-4 to 2.7x10-5. The results showed that the ratio of intrinsic viscosities of RPS to linear polystyrene (g) (η [η] _r / [η] _1) was about 0.63 and 0.65 in θ solvents and good solvents, respectively. The radius of gyration ( or / ol) is 0.55-0.59, both of which are close to the theoretical value of the macrocycle. The experimental results also show that the ring macromolecules comply with GPC universal calibration principle. In addition, the viscosity-molecular weight equation of RPS in cyclohexane, toluene and tetrahydrofuran solution is obtained.