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本工作对本体聚合的交替共聚物,聚[4-(4′-八甲基四硅氧基)二苯醚]作了重沉淀分级,再用粘度法、动态渗透压,光散射及GPC对级分和未分级试样作了分子量和分布宽度的测定。实验数据经多分散性改正后,得到该共聚物单分散的特性粘数-分子量关系式: [η]=2.33×10~(-3)M~(0.88)(毫升/克,25℃,四氢呋喃)该共聚物在四氢呋喃溶液中的第二维利系数A_2随分子量的增加而降低,依从A_2=3.60×10~(-2)的关系. 该共聚物在水中加热后放置几天会产生降解。紫外和红外光谱说明降解后共聚物的化学组成没有明显变化。
In this work, poly (4- (4’-octamethyltetrasiloxy) diphenyl ether] as an alternating copolymer of bulk polymerization was gravimetrically fractionated by viscosimetry, dynamic osmotic pressure, light scattering and GPC The determination of the molecular weight and distribution width of the fractions and the unfractionated specimens. After the experimental data were polydisperse corrected, the monodispersed intrinsic viscosity-molecular weight relationship of the copolymer was obtained: [η] = 2.33 × 10 -3 M ~ 0.88 (ml / g, 25 ° C, tetrahydrofuran ) The second Weili coefficient A 2 of the copolymer in tetrahydrofuran decreased with the increase of molecular weight, which was in accordance with A 2 = 3.60 × 10 -2 The copolymer was degraded in a few days after it was heated in water. UV and IR spectra showed no significant change in the chemical composition of the copolymer after degradation.