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本工作合成了含有聚甲基丙烯酸和各种聚酯(聚ω-羟基庚酸酯,聚ω-羟基壬酸酯或聚ω-羟基十一酸酯)的接枝共聚物。结果表明,接枝共聚物的产率和反应速率与原料的比例以及所用聚酯结构单位中—CH_2—数目有关。 所得接枝共聚物只溶于含有极性和非极性的溶剂(例如苯甲醇)中,它在单一的极性或非极性溶剂中的溶胀度与接枝共聚物中聚甲基丙烯酸主链和聚酯枝链的比值以及所用聚酯分子结构有关。 不同聚酯枝链的结构和含量使所得的接枝共聚物具有不同的结晶度。结晶形的接枝共聚物有可能形成球晶。 接枝共聚物在高于原来聚酯的熔点和高于ΠMAK的分解温度以上的宽广温度范围内(220—250℃)出现高弹态。
In this work, graft copolymers containing polymethacrylic acid and various polyesters (poly (ω-hydroxyheptanoate, poly ω-hydroxynonanoate or poly ω-hydroxyundecanoate) were synthesized. The results show that the yield of the graft copolymer and the reaction rate are related to the ratio of the raw materials and the number of -CH 2 - in the structural unit of the polyester used. The resulting graft copolymer is soluble only in polar and non-polar solvents such as benzyl alcohol and its degree of swelling in a single polar or non-polar solvent is as high as the degree of swelling of the polymethacrylic acid master The ratio of chain to polyester branches and the molecular structure of the polyester used. The structure and the content of different polyester branches make the resulting graft copolymer have different degrees of crystallinity. Crystalline graft copolymers may form spherulites. The graft copolymer exhibits a high elastic state over a broad temperature range (220-250 ° C) above the melting point of the original polyester and above the decomposition temperature of ΠMAK.