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Synthesis and properties investigation of hydroxyl functionalized polyisoprene prepared by cobalt catalyzed co-polymerization of isoprene and hydroxylmyrcene

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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 AlEt2Cl, 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, 1H/13C 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.

Graphical abstract: Synthesis and properties investigation of hydroxyl functionalized polyisoprene prepared by cobalt catalyzed co-polymerization of isoprene and hydroxylmyrcene

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Article information


Submitted
28 Nov 2019
Accepted
31 Jan 2020
First published
07 Feb 2020

Polym. Chem., 2020, Advance Article
Article type
Paper

Synthesis and properties investigation of hydroxyl functionalized polyisoprene prepared by cobalt catalyzed co-polymerization of isoprene and hydroxylmyrcene

Y. Xu, J. Zhao, Q. Gan, W. Ying, Z. Hu, F. Tang, W. Luo, Y. Luo, Z. Jian and D. Gong, Polym. Chem., 2020, Advance Article , DOI: 10.1039/C9PY01808E

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