Abstract
Polytetrafluoroethylene (PTFE) is used in quake-absorbing structures because of its low friction characteristic. Because of its low surface energy, however, a pristine PTFE surface exhibits difficulty adhering to other substances. Consequently, PTFE surface normally requires some pretreatment such as chemical modification before adhesion. We herein propose a new surface modification route for adhesion enhancement of PTFE/epoxy resin interfaces using plasma-assisted morphological and molecular designs. Plasma processing methods under air and in water were used to introduce the peroxide radical and porous structures onto the PTFE surface. Subsequently, a polyethyleneimine derivative having primary amino groups at the molecular end in the side-chain was chemically modified by graft copolymerization to introduce reactive functional groups on the surfaces against epoxy resin-based glue. We achieved enhancement of T-peel strength between the PTFE substrate/ epoxy resin/ SUS substrate of 9.3 N/mm, which exceeds the T-peel strength obtained from conventionally used sodium-naphthalene processing (9.1 N/mm).
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