聚N-亚芳基苯并咪唑醚砜的无规共聚与性能表征

Synthesis and Characterization of Co-Poly( N-Arylenebenzimidazole Ether Sulfone) s

选用砜基双苯并咪唑作为第三单体,与砜基二酚以及砜基二氟单体进行亲核取代共聚,将苯并咪唑结构引入聚醚砜主链中,合成了无规共聚聚N-亚芳基苯并咪唑醚砜。对聚合物的涂覆成膜条件进行了探索,并对其表面性能、光学性能、热学性能、溶解性能和力学性能进行了表征。实验结果表明,当砜基二酚单体用量高于砜基双苯并咪唑单体用量时,所得聚合物可以通过涂覆法得到平整而透明的薄膜;双苯并咪唑单体的引入使得聚合物的耐热性有较大提高(玻璃化转变温度和初始分解温度分别升高56℃和44℃),但同时也使得聚合物的在有机溶剂中的溶解性能有所下降;聚合物薄膜具有较好的表面平整性和透光性,双苯并咪唑结构的存在有利于提高薄膜的平整性,但也使得薄膜的透光性有所下降;聚合物薄膜呈现脆性状态,且脆性程度随着双苯并咪唑单体用量的增大而增大,其断裂伸长率为3.1%~7.2%。

Co-poly( N-arylenebenzimidazole ether sulfone) s( PNABIES) s were synthesized by using copolymerization of bis( benzimidazolyl) derivatives as the third monomer,bis( phenol) derivatives and activated difluorides monomers. The film forming condition was explored along with the characterization of surface proporities,optical properities,thermal properties,solubilities and mechanical properties of the polymers. The results indicate that uniform and transparent membranes can be obtained by simple solution casting when the content of bis( phenol) derivatives is larger than that of bis( benzimidazolyl) derivatives. The heat resistant properties were obviously improved( the glass transition temperature and the initial decomposition temperature increase by 56 ℃ and 44 ℃ respectively) as well as the solubilities in organic solvents decreases due to introduction of benzimidazole structures into the polymers backbones. The existence of benzimidazole structures also improves surface smoothness while declines the optical transparency of the polymers to a certain extent. The synthesized polymers are brittle,and the brittleness increases with enlargement of benzimidazole content,and the elongation at break is from 3. 1% to 7. 2%.