Influence of Isoprene on Anionic Copolymerization of 1,3-Pentadiene and Styrene

被引：0

作者：

Xiong Q. ^{[1
]}

Gu Z. ^{[1
]}

Xie F. ^{[1
]}

Yang S. ^{[1
]}

Peng C. ^{[1
]}

Liu W. ^{[1
]}

Chen H. ^{[1
]}

Chen S. ^{[1
]}

Zhang Q. ^{[1
]}

Gong L. ^{[2
]}

Xiao Z. ^{[2
]}

Yuan Y. ^{[2
]}

She Z. ^{[2
]}

Xia J. ^{[2
]}

Xu J. ^{[1
]}

Li A. ^{[1
]}

Liu K. ^{[1
]}

机构：

[1] College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang

[2] China Petroleum and Chemical Corporation, Baling Branch, Yueyang

来源：

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2023年 / 39卷 / 03期

关键词：

1,3- pentadiene; alternating copolymerization; isoprene; random copolymerization; sequence distribution; styrene;

D O I：

10.16865/j.cnki.1000-7555.2023.0069

中图分类号：

学科分类号：

摘要：

The sequence structure of diene-styrene copolymer greatly affects the comprehensive properties of related rubber products (like styrene-butadiene rubber and similarly integrated rubber) or resin products (like styrene-butadiene resin). Living anionic polymerization has great advantages in controlling the comonomer sequence types, such as ideal block sequence, tapered block sequence, random sequence and alternating sequence. A novel conjugated diene,1,3pentadiene (PD),can undergo anionic copolymerization with styrene to afford the special alternating sequence, whereas the high sequence 1,4- structure can be obtained by anionic polymerization of isoprene (IP). In this paper, the copolymerization of PD, styrene (ST) and IP was carried out in cyclohexane (containing 150 × 10-6 tetrahydrofuran) initiated by n-butyllithium (n-BuLi). The copolymerization kinetics and microstructure of the resultant copolymer were investigated in details. The results show that (1) the homo-polymerization kinetics shows that the polymerization rate is listed in this order ST>IP>>PD, and ST/IP and PD/IP binary copolymerization show the classical "double S" curve (conversion vs. time). Moreover, the ST/PD binary copolymerization rate is similar to the IP homopolymerization rate; (2) NMR and reactivity ratio data show that ST/PD binary copolymerization conforms to classical alternating copolymerization behavior. Infrared data show that the 1,4-structure content of binary copolymer is higher than 90%, and the trans-1,4-structure is higher than 85%; (3) the relationship between the conversion rate of terpolymerization and composition of instantaneous terpolymer shows that isoprene is inserted into the ST-PD sequence with a high cis-1,4-structure, and there is no obvious ST or PD microblock sequence in the terpolymer, and thus the sequence of ST/IP/PD is almost random; (4) the ternary copolymerization show obvious living and controllable polymerization, and the molecular weight is highly consistent with the theoretical value, and the molecular weight distribution is all less than 1.10; (5) DSC results show that ternary sequence copolymer is an amorphous polymer with only one Tg, indicating the possible formation of random sequence distribution of comonomers; (6) based on the special alternating copolymerization of ST/PD, the possible ternary polymerization mechanism of ST/IP/PD was speculated. © 2023 Chengdu University of Science and Technology. All rights reserved.

引用

页码：16 / 25

页数：9

共 17 条

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