Study On The Relationship Of Molecular Chain Structure And Properties Of Poly(Aryl Ether Sulfone)

Aromaticity of high performance polymer molecular chain structure endues its excellent performance, but the rigid structure of molecular chain in thermoplastic high performance polymer results its very high melt viscosity to limit its application. Generally, it’s difficult to find a kind of method that the thermal and mechanical properties of high performance polymer will not be reduced but only the melt viscosity of high performance polymer is decreased. In this paper, our investigation shows that the flow of the polymer melt is the movement of polymer chain along the direction of force.So to make the rigid part move as least as possible by controlling the sequence distribution of the flexible part and the rigid part of high performance polymer will reduce its melt viscosity.In this paper, several kinds of poly(aryl ether sulfone), including alternating copolymer, block copolymer and pocket copolymer were designed and synthesized. The proportion of sulfuryl, ether and phenyl don’t change in this several polymers, but the sequence distribution of the flexible part and the rigid part of polymer is different by controlling the sequence structure of polymers. The results show that the thermal, mechanical properties of these polymers are almost same under the similar molecular weight and the same chemical composition. The investigation on melt viscosity of these polymers proves that the melt viscosity with similar molecular weight change very much and the melt viscosity of alternate copolymer is only half of that of random copolymer., In order to understand if the mechanical properties of the polymers with same molecular chain structure will change after the polymers are heat treated, we study the properties of polyphenylene sulfone after heat treatment.The results indicate that the thermal properties of polyphenylene sulfone after heat treatment change greatly although polyphenylene sulfone is amorphous. This shows that the molecular chain structure of polyphenylene sulfone after heat treatment can change and create the local ordered structure so the properties of polyphenylene sulfone are changed.