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合成了四种离子聚合物2,6Br、2,10Br、6,10Br 和6,6Br.用小角激光光散射法测定前三种的分子量,并在0.4M KBr 水溶液中,于30℃确定它们的分子量和特性粘数的关系.表明它们都呈柔顺无规线团,电荷分布没有明显影响.计算了2,10Br 和6,10Br 的自由旎转链尺寸、在0.4M KBr 水溶液中的分子尺寸和无干扰尺寸,从而算得它们的扩张因子和内阻因子.发现其扩张因子均接近1;6,10Br 的内阻因子与文献报导的3.4Br 和6.6Br 的基本相同,而2,10Br 的较小.并且发现随着KBr 浓度的增加,2,10Br 的〔η〕比6,10Br 的〔η〕下降较快.认为这些现象与主链上-CH_3的分布有关,提出疏水微区的概念.确定了这四种离子聚合物在水中30℃的特性粘数和分子量的关系,其参数α接近于2,反映它们在无外加盐的情况下,都呈刚性棒状,电荷分布对其形态没有明显影响.
Four ionic polymers, 2,6Br, 2,10Br, 6,10Br and 6,6Br, were synthesized.The molecular weights of the first three were determined by low-angle laser light scattering and their molecular weights were determined in 0.4 M KBr aqueous solution at 30 ° C Molecular weight and intrinsic viscosity.The results show that all of them have a soft and random coil, the charge distribution has no significant effect.The free size of 2,10Br and 6,10Br chain size, molecular size in 0.4M KBr aqueous solution and No interference size, and thus calculate their expansion factor and internal resistance factor .It was found that the expansion factor are close to 1; 6,10 Br of internal resistance factor and reported 3.4Br and 6.6Br basically the same, and 2,10 Br smaller It was found that [η] of 2,10 Br reduced more rapidly than [η] of 6,10 Br with the increase of KBr concentration.These phenomena were related to the distribution of -CH 3 in the main chain, and the concept of hydrophobic microdomains was proposed. The relationship between intrinsic viscosities and molecular weights of these four ionic polymers at 30 ℃ in water is close to 2, indicating that they are all rigid rods in the absence of added salt. The charge distribution has no significant effect on the morphology .