Preparation and characterization of polarity-modulated SIS-based hot-melt pressure-sensitive adhesives

Abstract

In order to develop polarity-modulated hot-melt pressure-sensitive adhesives (HMPSAs), epoxidation of styrene-isoprene-styrene (SIS) copolymers, using in situ prepared per-formic acid was studied. The polymers were characterized with Fourier-transform infrared spectroscopy, ¹H nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and contact angle tests. The epoxidation degree linearly increases with the epoxidation time without side reaction at low temperature. The polarity of the polymers increases with the epoxidation degree. At low epoxidation degree, the 180° peel strength of epoxidated-SIS-based HMPSA increases with the epoxidation degree. In epoxidated-SIS-based HMPSAs, ESIS plays the role of compatibilizer.

Keywords:

• Styrene-isoprene-styrene
• epoxidation
• hot-melt pressure-sensitive adhesives
• polarity

Acknowledgments

The authors acknowledge the financial support of the Natural Science Foundation of China, Program (No. 51073029), Department of Science & Technology of Liaoning Province, and the Fundamental Research Funds for the Central Universities of China (No. DUT11LK18). We also thank Dr Zhansheng Li, Dr Yanming Hu, and Dr Xuesong Xiao for their discussion.