Syntheses and Properties of Triblock Copolymers with Poly-α-methylstyrene as Hard Blocks

Abstract

Abstract: Triblock copolymers with polya-methylstyrene as hard blocks and with poly-butadiene and hydrogenated polybutadiene as soft blocks were synthesized,and their polymerization processes, structures and properties were studied. Although these two kinds of triblock copolymers exhibited the similar T_gs (both about-25℃) of their soft blocks, the tensile strength and elongation of break, resilience and T_g of the hard blocks of PaMS-HPBD-PaMSall are lower evidently than those of PaMS-PBD-PaMS. The reason is that the solubility parameter of HPBDis higher than that of PBD,so the solubility of HPBDin PaMSis higher than that of PBD. The dynamical properties" of PaMS-PBD-PaMSare better than those of ABCtriblock copolymer of PaMS-PBD-PPVL, because it is incompatible between crystalline PPVL and radom PaMS blocks.

Key words: Triblock copolymer, Solubility parameter, Tensile strength

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Li Youxin, Jiang Shuojian, Feng Xinde . Syntheses and Properties of Triblock Copolymers with Poly-α-methylstyrene as Hard Blocks[J]. Chem. J. Chinese Universities, 1988, 9(5): 499.

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Syntheses and Properties of Triblock Copolymers with Poly-α-methylstyrene as Hard Blocks

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