Title :
Controlled synthesis of ortho-substitution ortho-cresol novolac resins
Author :
Tian, Xiaowei ; Yang, Zhenguo ; Sun, Jiang-Yan ; Ji, Zheng ; Jiang, Chuang
Author_Institution :
Dept. of Mater. Sci., Fudan Univ., Shanghai, China
Abstract :
The structure of ortho-cresol novolac resin is very important for the synthesis of ultra-high purity ortho-cresol novolac epoxy resin used as electronic encapsulating materials. But the relationship between the synthesis conditions and the structure of ortho-cresol novolac resin has not yet been completely clarified. This paper mainly studied the controlled synthesis of different proportion of ortho-substitution ortho-cresol novolac resins under different reaction conditions, such as molar ratio of ortho-cresol to formaldehyde, different catalyst types, reaction time. Then, the structure of different ortho-substitution ortho-cresol novolac resins were investigated by many measurements, such as FTIR, 1H-NMR, 13C-NMR, and the softening point. And the relationships between the structure and the reaction conditions were thus studied. The results indicated that, the ortho-cresol novolac resin with the needed proportion of ortho-substitution was synthesized through the adjustment of the reaction conditions.
Keywords :
electronics packaging; polymers; electronic encapsulating material; ortho-substitution ortho-cresol novolac resin controlled synthesis; softening point; ultra-high purity ortho-cresol novolac epoxy resin; Bridges; Materials science and technology; Powders; Proportional control; Resins; Semiconductor materials; Softening; Solvents; Sun; Zinc;
Conference_Titel :
Electronic Packaging Technology & High Density Packaging, 2009. ICEPT-HDP '09. International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-4658-2
Electronic_ISBN :
978-1-4244-4659-9
DOI :
10.1109/ICEPT.2009.5270646