SYNTHESIS AND MODIFICATION OF A TRIFUNCTIONAL EPOXY-RESIN WITH AMINO-TERMINATED POLY(DIMETHYLSILOXANE)S FOR SEMICONDUCTOR ENCAPSULATION

A high-performance trifunctional epoxy resin based on the triglycidyl ether of tris (4-hydroxyphenyl)-methane (TETM) was synthesized by the condensation of 4-hydroxybenzaldehyde with phenol followed by epoxidat ion with epichlorohydrin. The structure of TETM was confirmed by mass spectra, infrared and nuclear magnetic resonance spectroscopy. Amino-t erminated poly(dimethylsiloxane)s were used to reduce the stress of th e trifunctional epoxy resin cured with phenolic novolac resin for elec tronic encapsulation application. The dispersed silicone rubbers effec tively reduce the stress of cured epoxy resins by reducing the coeffic ient of thermal expansion and flexural modulus while the glass transit ion temperature was hardly depressed.