ScholarWorks@중앙대학교

초록

Designing adjustable adhesive materials to overcome the typical trade-off between adhesive and mechanical properties has been a challenging subject in various industries including flexible electronics that often require thin film adhesives for laminating several constituent layers. In this study, a multi-layered thin-film nanocomposite pressure-sensitive adhesive (PSA) is synthesized, in which graphene oxide filled nanocomposite adhesive as a core layer and unfilled adhesives as surface layer are formed using a blade coating process. A highly tacky adhesive is used for both core and surface layers to increase adhesive properties, and graphene oxide is exfoliated by microwave irradiation and coated with polydopamine to increase the mechanical properties of core layer. The optimized multi-layered adhesive film with a thickness of 200 μm shows 37 % increase in tensile strength but only 10 % decrease in peel strength compared with the unfilled film, which is clear evidence for overcoming the trade-off referring that single-layered nanocomposite film show 28 % increase in tensile strength but 46 % decrease in peel strength. The reinforcing mechanism of the multi-layered structure is also investigated by numerical simulation via cohesive zone model using various kinds of measurements including tensile, lap shear and probe tack tests as input data.

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