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Synthesis and structure–property relationships of SIS-g-PB copolymers and their application in hot-melt pressure-sensitive adhesives

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Abstract

A “graft onto” method was combined with an epoxidation reaction and living anionic polymerization to successfully synthesize a series of SIS-g-PB copolymers with defined branch numbers and branch lengths. These copolymers were utilized to formulate various hot-melt pressure-sensitive adhesives (HMPSAs). Their molecular structure and bulk properties were characterized by 1H-nuclear magnetic resonance (1H-NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and rheometry. The adhesion performances were characterized in terms of holding power and 180° peel strength. The epoxidation reaction alone would negatively influence the rheological properties of the parent SIS copolymers, particularly for low-temperature applications. Controlled addition of the low-Tg PB blocks can significantly improve the low-temperature properties of the SIS copolymers. Both η* and G′ increased in the lower shear frequency regime (<101 rad s−1) but decreased in the higher shear frequency regime (>101 rad s−1) with branch number and branch length, in which branch length had a greater effect than the branch number. As a result, the 180° peel strength of the SIS-g-PB based HMPSAs displayed reached 0.23 kN m−1, which is more than twice the value for SIS-based HMPSAs.

Graphical abstract: Synthesis and structure–property relationships of SIS-g-PB copolymers and their application in hot-melt pressure-sensitive adhesives

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Article information


Submitted
25 Jul 2017
Accepted
06 Sep 2017
First published
12 Sep 2017

This article is Open Access

RSC Adv., 2017,7, 44068-44075
Article type
Paper

Synthesis and structure–property relationships of SIS-g-PB copolymers and their application in hot-melt pressure-sensitive adhesives

Z. Zhao, P. Liu, C. Zhang, W. Liu, Y. Ding, Y. Zhang, F. Meng and T. Tang, RSC Adv., 2017, 7, 44068
DOI: 10.1039/C7RA08180D

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