Hecheng xiangjiao gongye (Oct 2024)

"Molecular structure design and synthesis of star-shaped multi-arm styrene-butadiene copolymer"

  • SONG Yu-jun, ZHAO Zhong-fu, LI Bo-han, LI Qian, LI Long-hao, ZHANG Chun-qing

DOI
https://doi.org/10.19908/j.cnki.ISSN1000-1255.2024.05.0367
Journal volume & issue
Vol. 47, no. 5
pp. 367 – 372

Abstract

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A series of star-shaped multi-arm styrene-butadiene copolymers (S-g-SSB-6) were synthesized by living anionic polymerization, with n-butyllithium as initiator, styrene and butadiene as monomers, 2,2-di(tetra-hydrofuran-2-yl) propane as polar structure regulator and hexachlorodisilane as coupling agent. The molecular weight and its distribution, coupling arm number and coupling efficiency of S-g-SSB-6 were characterized by gel permeation chromatogram. The rheological properties of S-g-SSB-6, star-shaped multi-arm styrene-butadiene copolymer with SiCl4 as coupling agent, and linear styrene-butadiene copolymer (L-SSB) were characterized by rotational rheometer, and the effects of branched chain length and branched chain flexibility on the rheological properties of S-g-SSB-6 were also investigated. The results showed that the coupling arm numbers of S-g-SSB-6 reached 4.1, and the coupling efficiency was greater than 80%. S-g-SSB had lower melt viscosity and better fluid flow than those of L-SSB under the same weight-average molecular weight. When the branching degree was the same, the melt viscosity of S-g-SSB-6 increased with the increase of single arm molecular weight and molecular chain rigidity.

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