多检测GPC/SEC技术在高分子表征中的应用 Ⅲ.新型聚炔类梳形液晶高分子

Use of Multiple Detectors GPC/SEC in Polymer Characterization Ⅲ. Novel Liquid Crystalline Polymer

采用体积排斥色谱法／ 示差折光指数／ 直角激光光散射／ 示差粘度三检测联用技术表征聚炔类梳形液晶高分子，阐述了在溶液中分子尺寸与结构的关系，计算了无扰尺寸（ ＜ ｒ２０ ＞ ／ Ｍ）１／２ 和Ｆｌｏｒｙ 特征比Ｃ∞，讨论了侧基的柔性和体积对主链柔性程度的影响。

Novel liquid crystalline polymers of polyacetylenes with comb structure were studied by SEC/RI/RALLS/DV. The relationship between the molecular size and the polymer structure was formulated, and the theta condition of two samples was obtained. Flory′s characteristic ratios C ∞ and unperturbed dimensions (<r 2 0>/M) 1/2 were calculated. The effect of the side group size on chain flexibility was discussed. The results show that the technique of SEC/RI/RALLS/DV is a useful means for characterizing the novel liquid crystalline polymer of polyacetylenes with comb structure, which can not be effectively characterized by conventional SEC.