【摘要】 本文合成了不同分子量的5个4-臀星形聚苯乙烯和4个7-臂星形聚苯乙烯试样,用GPC粘度计联用装置对之进行了测定。提出了一种用良溶剂中的粘度数据,通过线性外推方法,得到θ条件下的g’_θ因子(=[η]_b,θ/[η]_l,θ)的理论处理方法。对良溶剂中的g’因子（=[η]_b/[η]_l）和g’_θ因子之间的差异以及g’_θ因子与g_θ因子(=S_b,θ^z/S_l,θ^z)间关系式g’_θ=g’_θ^∈中的∈选值问题进行了详细的讨论,结果证实,∈不仅与支化类型有关,而且与支化程度有关,对4-臂星形聚苯乙烯,∈=1.487,而对7-臂星形聚苯乙烯,∈=1.14。4-臂星形聚苯乙烯的g’和g’_θ因子差别较小;对7-臂星形聚苯乙烯,两者间差别较大,不可忽视。更多还原

【Abstract】 Five 4-arm-and four 7-arm-star shaped polystyrene samples different in molecular weight have been prepared and examined by GPC combined viscosimetry. A theoretical treatment method is proposed to obtain the factor g’θ（=[η]b,θ/[η]l.θ.）from viscosity in good solvent. The difference between the factor g（=[η]b/[η]l） and g’θ,as well as the ∈-value in the relationship between g’θ, and gθ( =S_b,θ²/S_i,θ⁾, （g’θ=g_θ^ε） have been discussed.The results verified that the ∈-value not only depends on the type of branching, but also depends on the degree of branching, ∈=1.487 and 1.14 for 4-arm and 7-arm star polystyrene, respectively. The difference between g’ and g’θ is smaller for 4-arm star polystyrene, but is larger for 7-arm star polystyrene.更多还原