Thermal and Optical Properties of Epoxy/Siloxane Hybrimer Based on Sol-Gel-Derived Phenyl-Siloxane

Kuo-Hui Wu¹, Ken-Fa Cheng¹, Cheng-Chien Yang², Chung-Pao Wang³, Chi-I Liu³

¹Department of Chemical and Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan.
²Chemical Systems Research Division, Chung Shan Institute of Science and Technology, Taoyuan, Taiwan.
³System Manufacturing Center, Chung Shan Institute of Science and Technology, Shanshia, Taiwan.

DOI: 10.4236/ojcm.2015.53008                

Abstract

A hybrimer based on epoxy resin and phenyl-siloxane was prepared by polymerization and a solgel condensation reaction in which Eporite-904 (807 g/eq) bisphenol-A-type epoxy resin, 3-isocyanatopropyltriethoxysilane (IPTES) and phenyltriethoxysilane (PTEOS) acted as precursors. The thermal and optical properties of the epoxy/siloxane hybrimer were studied. The thermogravimetric analysis (TGA) results implied that the hybrimer could increase the crosslink density and enhance the thermal properties. The optical properties were measured after thermal and UV aging. The refractive indexes of the epoxy/siloxane hybrimers were 1.66 - 1.70, and the transmittances of the cured hybrimers were above 90% in the visible wavelength. After a 120°C/24-h thermal aging test, the decreases in the refractive index and transmittance were less than 5% and 20% respectively. The epoxy/siloxane hybrimers also showed low discoloration upon thermal aging at 120°C for 24 h under an air atmosphere.

Keywords

Epoxy, Siloxane, Encapsulating Material, Optical Properties

Conflicts of Interest

The authors declare no conflicts of interest.

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