论文部分内容阅读
本文用粘度和小角光散射法确定了聚苯醚砜(PPES)25℃时θ溶剂的组成(DMF与C_2H_5OH的体积比为81.5:18.5)。表征了PPES链的柔性参数A=(r_0~2/M)~(12)=0.0864 nm,C_∞=r_0~2/nl~2=2.5。订定PPES在DMF中25℃的MHS方程为[η]=0.0499 M~(0.63),与Allen的结果不同。得到了第二维利系数A_2与重均分子量的关系为A_2=0.0375 M~(-0.36),还测定了PPESDMF体系的Huggins参数X_1。
In this paper, the composition of θ solvent at 25 ℃ of polyphenylene ether sulfone (volume ratio of DMF and C 2 H 5 O 81: 81.5: 18.5) was determined by viscosity and small angle light scattering. The flexible parameter A = (r_0 ~ 2 / M) ~ (12) = 0.0864 nm and C_∞ = r_0 ~ 2 / nl ~ 2 = 2.5 were characterized. The MHS equation for setting PPES in DMF at 25 ° C is [η] = 0.0499 M ~ (0.63), which is different from Allen’s results. The relationship between the second Weili coefficient A_2 and the weight average molecular weight was found to be A_2 = 0.0375 M ~ (-0.36). The Huggins parameter X_1 of PPESDMF system was also determined.