The effect of 1,2-dipieridinoethane derivatives on the composition and hydride sequence distribution in LAP of styrene and isoprene

IF 3.9 2区化学 Q2 POLYMER SCIENCE

Polymer Chemistry Pub Date : 2025-10-09 DOI:10.1039/d5py00352k

Yang Yang, Qiqi Dai, Yao Long, Yujie Wang, Zhifang Chen, Yi Yang, Le Zhou, Yi Xiao, Xinyu Han, Jiexun Zhang, Shihan Ding, Kun Liu, Lijun Li

{"title":"The effect of 1,2-dipieridinoethane derivatives on the composition and hydride sequence distribution in LAP of styrene and isoprene","authors":"Yang Yang, Qiqi Dai, Yao Long, Yujie Wang, Zhifang Chen, Yi Yang, Le Zhou, Yi Xiao, Xinyu Han, Jiexun Zhang, Shihan Ding, Kun Liu, Lijun Li","doi":"10.1039/d5py00352k","DOIUrl":null,"url":null,"abstract":"Precise control of monomer sequences is of significant importance for the functional modification of polyolefins. For styrene/isoprene (ST/IP) random/alternating copolymers with the constant composition FST=0.5, the content variations of isomeric 1,3-diene units in alternating sequences (ST-alt-1,4-IP, ST-alt-3,4-IP and ST-alt-1,2-IP) significantly influence the properties of polyolefins. In this paper, a sterically hindered active center was constructed using 1,2-dipiperidinoethane(DPE)-derived polar additives and n-Butyllithium. The regulatory effects of these novel structure regulators on copolymer composition distributions and isomeric units sequence distributions were systematically characterized by 1H NMR spectroscopy, and the microstructure information was further verified by FTIR, DSC analysis. GPC analysis confirmed the living and controllable nature of copolymerization. Finally, the thermal performance differences of random copolymers with various hybrid sequence distributions were systematically investigated by DSC. These research results advance the understanding of sequence regulation polymerization mechanisms and provide a novel strategy for the controlled preparation of liquid rubber.","PeriodicalId":100,"journal":{"name":"Polymer Chemistry","volume":"83 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1039/d5py00352k","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}

引用次数: 0

Abstract

Precise control of monomer sequences is of significant importance for the functional modification of polyolefins. For styrene/isoprene (ST/IP) random/alternating copolymers with the constant composition FST=0.5, the content variations of isomeric 1,3-diene units in alternating sequences (ST-alt-1,4-IP, ST-alt-3,4-IP and ST-alt-1,2-IP) significantly influence the properties of polyolefins. In this paper, a sterically hindered active center was constructed using 1,2-dipiperidinoethane(DPE)-derived polar additives and n-Butyllithium. The regulatory effects of these novel structure regulators on copolymer composition distributions and isomeric units sequence distributions were systematically characterized by 1H NMR spectroscopy, and the microstructure information was further verified by FTIR, DSC analysis. GPC analysis confirmed the living and controllable nature of copolymerization. Finally, the thermal performance differences of random copolymers with various hybrid sequence distributions were systematically investigated by DSC. These research results advance the understanding of sequence regulation polymerization mechanisms and provide a novel strategy for the controlled preparation of liquid rubber.

查看原文本刊更多论文

1,2-二吡啶乙烷衍生物对苯乙烯和异戊二烯在LAP中的组成和氢化物序列分布的影响

单体序列的精确控制对聚烯烃的功能改性具有重要意义。对于固定组分FST=0.5的苯乙烯/异戊二烯（ST/IP）无规/交替共聚物，交替序列（ST-alt-1,4-IP、ST-alt-3,4-IP和ST-alt-1,2-IP）中1,3-二烯异构单元的含量变化显著影响聚烯烃的性能。本文采用1,2-二哌替啶乙烷（DPE）极性添加剂和正丁基锂构筑了位阻活性中心。通过1H NMR谱分析系统表征了这些新型结构调节剂对共聚物组成分布和异构单元序列分布的调节作用，并通过FTIR、DSC分析进一步验证了其微观结构信息。GPC分析证实了共聚反应的活性和可控性。最后，通过DSC系统地研究了不同杂化序列分布的无规共聚物的热性能差异。这些研究结果促进了对序列调控聚合机理的认识，为液体橡胶的可控制备提供了新的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Polymer Chemistry POLYMER SCIENCE-

CiteScore

8.60

自引率

8.70%

发文量

535

审稿时长

1.7 months

期刊介绍： Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.