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论文类型：期刊论文

发表时间：2012-05-01

发表刊物：POLYMER DEGRADATION AND STABILITY

收录刊物：SCIE、EI

卷号：97

期号：5

页面范围：810-815

ISSN号：0141-3910

关键字：Cycloaliphatic epoxide; Cationic polymerization; Thermal degradation; Electronic packaging

摘要：The present work is to investigate thermally reworkable cycloaliphatic epoxy resins containing two or three phosphate groups per molecule for electronic and LED encapsulations. Different form the conventional reworkable epoxy resins, the epoxides here were cured via thermo-initiated cationic polymerization at a moderately low temperature. The experimental results showed that the incorporation of thermally-labile phosphate groups made the cured products start to degrade at around 220 degrees C, and lose over 50% weight after thermal treatment at 250 degrees C for only 3 min. The residue could be conveniently removed, exhibiting excellent reworkable properties of thermosetting epoxy resins. More importantly, through the copolymerization of phosphate-containing epoxide with commercial ERL-4221, the degradation temperatures could be readily tuned within the desirable reworking temperature range from 200 degrees C to 300 degrees C by adjusting the ratio of two monomers. The comparison of degradation behaviors and mechanism as well as the physical properties between the cationic and anhydride curing methods were studied by means of thermogravimetry, infrared spectroscopy and dynamic mechanical analysis in detail. (C) 2012 Elsevier Ltd. All rights reserved.