【摘要】 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3×10⁴至2.7×10⁵。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（<R²>or/<R²>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。更多还原

【Abstract】 Ring-shaped polystyrene （RPS） was prepared through cyclization reaction of linearpolystyrene with active end groups. Systematical characterization of RPS fractions wascarried out by GPC-low angle laser light scattering spectroscopy and other methods. Themean value of the ratio g（=[η]_r/[η]₁） is 0.63 in θ solvent and ～0.65 in goodsolvents. The ratio of unperturbed mean square radius of gyration between ring and linearpolystyrene (（R¹）_or/（R²）_ol) is 0.55—0.59. They are both coincide with theoreticalvalues for macro rings. It is found that RPS complys with universal calibration cuvveof GPC and has smaller hydrodynamic volume than linear polystyrene. Parameters ofMark-Houwink equations of RPS in cyclohexane 34.5℃,toluene 25℃ and tetrahydrofuran30℃ have been obtained as K equals to 5.0, 0.683 and 1.2×10^-2;α equals to 0.5, 0.734and 0.68 respectively.更多还原