Synthesis and properties investigation of hydroxyl functionalized polyisoprene prepared by cobalt catalyzed co-polymerization of isoprene and hydroxylmyrcene. Issue 12 (11th February 2020)

• Record Type: Journal Article
• Authors: Xu, Yuechao; Zhao, Junyi; Gan, Qiao; Ying, Weilun; Hu, Zhonghan; Tang, Fuming; Luo, Wanwei; Luo, Yunjie; Jian, Zhongbao; Gong, Dirong
• Is Part Of: Polymer chemistry. Volume 11:Issue 12(2020)
• Page Start: 2034
• Page End: 2043
• Publication Date: 2020-02-11
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c9py01808e
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Controlled copolymerization of isoprene and hydroxylmyrcene afforded well-defined hydroxyl functionalized polyisoprene. Blends of functionalized polyisoprene/SiO2 displayed enhanced miscibility, and remarkable vulcanization and mechanical properties. Abstract : The intrinsic hydrophobicity of rubber matrices renders compatibility with polar fillers rather difficult in most cases. In this manuscript, a cobalt complex supported by a 2-oxazoline-pyridine ligand armed with a labile 6-(di- tert -butyl-phosphine oxide) moiety is prepared and characterized. In combination with excess AlEt2 Cl, the precursor actively copolymerizes isoprene with the bio-sourced myrcene derivative 2-methyl-6-methyleneoct-7-en-3-ol with adjustable comonomer incorporation from 4.4 mol% to 31.5 mol%. The presence of hydroxyl functionalized polyisoprene was characterized by using Fourier transform infrared spectroscopy, 1 H/ 13 C NMR, and validated by the improved hydrophilicity, elevated glass transition temperature and microphase separation observed by AFM. Up to 30 wt% SiO2 loading can be individually dispersed in the 4.4 mol% hydroxyl functionalized polyisoprene copolymer with substantially reduced aggregation. The improved filler–polymer interfacial interactions via "hydrogen bonds" offer not only effective improvement of the tensile strength (9.6 ± 0.2 MPa), but an unusual stretchability of over 885.3 ± 2.0% and improved hysteresis loss with respect to pristine polyisoprene/SiO2 vulcanizates.