聚苯乙烯大单体与丙烯酸丁酯接枝共聚物的微观分相与表面性能研究

研究了以大单体技术合成的不同侧链长度的苯乙烯与丙烯酸丁酯的接枝共聚物的侧链长度对其微观分相与表面性能的影响,发现仅当聚苯乙烯侧链分子量大于5900时,才可能发生部分微观相分离,分离后对其表面性能影响不明显。临界表面张力r_c虽有差异,但色散力部分y_s^D的计算值却较一致,与所用参照液无关。实验证实,接枝共聚物的表面几乎全被低表面能的聚丙烯酸丁酯骨架所复盖,呈现出明显的表面富集现象。

The Microphase Separation and Surface Proparty of Graft Gopolymers Prepared by Polystyrene Macromer and Butyl Acrylate

By using "macromer technique", the well-defined graft copolymers with polystyrene (PS) as side chains and polybutyl acrylate (PBA) as backbones were prepared and the microphase separation as well as the surface property of these graft copolymers were studied. The experimental results showed that the partial microphase separation could not be observed until the number average molecular weight of the PSside chain was more than₅₉₀₀ and the critical surface tension γ_c was not affected obviously by the composition and the microphase separation of those graft copolymers, but affected by the polar liquid series used (ethanol/water and ethylene glycol/n-octanol). However, the values of γ_S^D (dispersion energy of those copolymer surfaces) calculated by the Good-Giraflco-Fowkes-Young equation were almost constant for all polymers studied here. The results also showed that both sides of the graft copolymer film surfaces were enriched with PBAbackbone.