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28. Preparation and properties of addition curable silicone resins with excellent dielectric properties and thermal resistance

Author

Zhang, Beijing, Zhuo, Dongxian, Gu, Aijuan, Liang, Guozheng, Hu, Jiang-Tao, and Yuan, Li

Subjects
Silicones -- Usage, Epoxy resins -- Chemical properties -- Composition -- Production processes -- Identification and classification -- Electric properties -- Thermal properties, Dielectrics -- Chemical properties -- Composition -- Production processes -- Identification and classification -- Thermal properties, Engineering and manufacturing industries, Science and technology
Abstract

A new addition curable silicone resin (ASiR) system with excellent dielectric and thermal properties was developed, which consists of only two components: poly (methylphenylvinylsiloxane) (PMPVSi) and an end-capped hydrogen-functionalized hyperbranched polysiloxane (EHFHPSi). PMPVSi is synthesized by a green and controllable process; EHFHPSi is first synthesized via [A.sub.2] + [B.sub.3] approach, and then end-capped by hexamethyldisiloxane (HMDS). Three formulations were designed to investigate the optimum stoichiometry. Results show that cured ASiR resins have greatly different dielectric and thermal properties because of the different chemical structure of cured networks resulting from the different stoichiometrics. The resin with a suitable stoichiometry has not only excellent dielectric properties including extremely low dielectric constant (2.96 at 1 Hz) and loss (0.0003 at 1 Hz) as well as good stability on frequency, but also outstanding thermal resistance, exhibiting great potential to be used as a new kind of high-performance resins for many cutting-edge industries, especially the microelectronic and insulation fields. POLYM. ENG, SCI., 52:259-267, 2012. © 2011 Society of Plastics Engineers, INTRODUCTION Addition curable silicone resins are known to be cross-linked semi-inorganic polymers with the Si-O-Si chains as backbones and some organic groups as side chains, which possess combined properties of [...]

Published
2012
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32. A novel hybrid catalyst system and its effects on the curing, thermal, and dielectric properties of cyanate ester

Author

Dai, Shankai, Zhuo, Dongxian, Gu, Aijuan, Liang, Guozheng, and Yuan, Li

Subjects
Cyanates -- Thermal properties -- Electric properties, Catalysis -- Research, Curing -- Methods, Engineering and manufacturing industries, Science and technology
Abstract

High curing temperature is the key disadvantage of cyanate esters. A novel catalyst system was developed, which is a hybrid catalyst system (HC) consisting of UV activated tricarbonyl cyclopentadienyl manganese (Catalyst I) and Catalyst II derived from dibutyl tin dilaurate. The effect of HC on the reactivity of 2, 2'-bis(4-cyanatophenyl) isopropylidene (BADCy) monomer, and that on the dielectric and thermal properties of cured resin were investigated. Results show that HC displays an attractive synergy effect on catalyzing BADCy over its two components. Compared with the curing exothermic peak of BADCy, that of BADCy/HC system appears at significantly lower temperature (which is at least 120°C lower than the former). In addition, cured BADCy/HC resin also exhibits interesting synergy effect in integrated performance, that is, it has much better thermal resistance and dielectric properties than cured BADCy, BADCy/Catalyst I, and BADCy/Catalyst II resins. The BADCy/HC resin can be used as high performance matrices for advanced composites and adhesives. POLYM. ENG. SCI., 51:22362244, 2011. @ 2011 Society of Plastics Engineers, INTRODUCTION Cyanate ester (CE) resins have excellent integrated properties, such as outstanding dielectric property, thermal resistance as well as good processing etc, so CE resins have been regarded as the [...]

Published
2011
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