High-performance transparent solvent-free silicone resins with stable storage and low viscosity based on new hyperbranched polysiloxanes. (August 2013)

• Record Type: Journal Article
• Authors: Zhu, M.; Gu, A.; Liang, G.; Yuan, L.
• Is Part Of: High performance polymers. Volume 25:Number 5(2013)
• Page Start: 594
• Page End: 608
• Publication Date: 2013-08
• Subjects: Compatibility -- hyperbranched polysiloxane -- solvent-free silicone resin; Polymerization -- Periodicals; Polymers -- Periodicals; 547.7
• DOI: 10.1177/0954008313477119
• Languages: English
• ISSNs: 0954-0083

Abstract

Five new hyperbranched polysiloxanes, for example, methylhydrogen siloxanes (MHSis), with varying concentrations of silicon–methyl (Si-Me) groups were synthesized and characterized, and then a series of MHSi/poly(methylphenylvinylsilicone) (PSi) resins were prepared to investigate the influence of the structures and concentrations of MHSi on the integrated properties of both uncured and cured MHSi/PSi resins. The results show that the compatibility between MHSi and PSi is closely related to the concentration of Si-Me groups in the MHSi as well as the molar ratio of MHSi and PSi. If MHSi has a suitable concentration of Si-Me groups, and the molar ratios of MHSi to PSi are appropriate, transparent MHSi/PSi resins with stable compatibility can be obtained. In addition, these compatible resins show good thermal stability with dynamic mechanical and dielectric properties. They exhibit a great potential for use as high-performance solvent-free silicone resins in either vacuum pressure impregnating process or liquid-molding techniques.