Abstract
Poly(arylene ether sulfone) (PES) consisting of a comb-shape chain state with various aliphatic side groups was designed and synthesized. The polymer maintained good thermal stability and chemical resistance, and its loose chain stacking was more suitable for membrane separation than that of commercial poly(arylene ether sulfone)s. The thermal performance test showed glass transition temperature decreased from 184 °C to 157 °C with increases in aliphatic chain size. All thermal decomposition temperatures of the polymer exceeded 450 °C. Separation membranes for water treatment or gas separation were prepared and tested. SEM results showed the thickness of the skin layer decreased when the aliphatic side group lengthened, leading to a notably higher water flux. Additionally, gas permeability of the membranes was at least twice that of pure PES. An increasing selectivity to methane was observed: for a longer comb-shape polymer membrane, the selectivity to methane continues to increase.
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