Tuning of the Glass Transition Temperature of Epoxy Polymer

摘要

In order to develop the nanomaterials in the application for the flexible and strain-resilient electronics packaging, a suitable flexible polymer system needs to be determined first. The polymer system we selected was epoxy system, a thermosetting material. The flexible epoxy requires that the epoxy polymer is flexible at room temperature (RT), meaning that the glass temperature of epoxy should be lower than room temperature, requiring that the cross-linking density should be relatively low for the epoxy resin [1-4]. If the polymer chain between the functional groups is relatively long, the cross-linking density (or the concentration of the cross-linking in whole polymer) will be relatively low. Simultaneously, the long carbon chain between the cross-linking net will naturally be relatively more flexible, which will also result in the decrease of the glass temperature of the epoxy. In this paper, a series of the epoxy polymer was made and their glass transition temperatures were determined. In addition, the relationship between the Tg, composition and concentration will be discussed. .