According to the difference between reactivity ratio of styrene and butadiene (anionic polymeri-zation), a kind of S/B block copolymer with molecular weight distribution about 1 13 was synthesized by one step addition process with dilithium as initiator, cyclohexane as solvent and tetrahydrofuran as polar additive. S/B block copolymer was characterized by GPC, 1H-NMR, IR, DSC. The results showed that the block and tapered structure coexisted in the product. Obvious two phase separation structure The result s showed that the block and taperedst ructure coexisted in the product . Obvious two phase separation st ructure was observed through TEM. The mechanical properties of this product showed that it had characteristics of thermoplastic elastomer , but it spermanent set was relatively high due to the existence of the tapered st ructure. The result s of hot melt pressure sensitive adhesive with this S/ B block copolymer as main component showed that the rolling ball tack , the holding power and the peel st rength are satisfactory with the requirement .
YANG Hua ;JIN Guan-tai; PANG Jie-bin ;ZHANG Xing-ying ;YANG Wan-tai .
Study on synthesis of S/B block copolymer by one-step addition process with dilithium initiator [J]. Journal of Beijing University of Chemical Technology, 2000, 27(2): 18-21