Date of Publication:2022-10-04

Journal:高分子学报

Volume:51

Issue:12

Page Number:1385-1393

Abstract:The styrene/butadiene copolymer is widely used as elastomer in various applications of packing material, such as shoes, asphalt modifiers, etc. The control of structure is the key to control the properties of material. Living anionic polymerization is still state of the art for the precise preparation of SBC. However, the sequence distribution of the copolymerization of styrene and butadiene cannot be as precise as that of styrene and DPE derivatives, because the product of reactivity ratios of styrene and butadiene is not approximately equal to 0. The composition distribution control was proposed to describe the behaviour of monomers in the statistical anionic copolymerisation. Herein, the primary amine DPE derivative was copolymerized with styrene and butadiene. In the terpolymerization, two primary amine functionalized SBC with similar molecular weight but different composition distributions were synthesized by varying feeding orders (i.e. ran-NFSBC and grad-NFSBC). The kinetics of copolymerizations were calculated. In ran-NFSBC, the reactivity ratio of St to DPE derivative was 2.58. The conversion of primary amine DPE derivative was 71.7%. The composition distribution was random distribution. In grad-NFSBC, the primary amine DPE derivative was totally consumed. The composition distribution was determined to be gradient distribution using the timing sample method. Finally, the relationship between composition distribution and thermal behavior of SBC was preliminarily studied by DSC.

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