Author(s): LI Ying, HAN Han, YUAN Jinfang, College of Chemistry and Chemical Engineering, Engineering Laboratory for Flame Retardant and Functional Materials of Henan Province, Henan University, Minsheng College, Henan University
Pages: 9202-9206
Year: 2016 Issue:  9
Journal: Journal of Functional Materials
Keyword:  reversible addition fragmentation chain transfer; amphiphilic block copolymer; self-assembly; additives; porous polymer;
Abstract: A series of diblock copolymers,polystyrene-block-poly(vinyl pyrrolidone)(PSt-b-PVP),with different hydrophilic/hydrophobic ratios were synthesized by reversible addition fragmentation chain transfer(RAFT)polymerization.The structures and properties of the diblock copolymers were characterized by FT IR,1H NMR and GPC.Different additives and a series of PSt-b-PVP with different hydrophilic/hydrophobic ratios dissolved in selective solvents.After solvent evaporation,the transparent film was obtained by rising with water.FESEM was used to study the morphology and size of the polymer porous material.The influence of additives,solvent evaporation temperature,the solvents and the hydrophilic/hydrophobic ratios on pore size were also studied.The results show that if the structure that we uses contains—OH functional groups or the monomer itself is used as additive,the porous polymer formed would have smaller holes.Meanwhile,reducing the heat is benefit to reduce the size of porous.And if we can use the structure which hydrophilic/hydrophobic ratios is PSt101-b-PVP79,it would be more easier to form smaller porous.Besides,using volatile solvent can be good for the forming of porous.