| 초록 |
A series of silanized waterborne polyurethane(WPU) were synthesized from polycaprolactone diols(PCLs), isophorone diisocyanate(IPDI), dimethylol butanoic acid(DMBA) and (3-aminopropyl)triethoxysilane(APTES) with the addition of graphene oxide(GO) to the formulations of multifunctional cross-linking by sol-gel reaction. The structure, thermal and mechanical properties of the WPU have been investigated by Fourier transform infrared spectroscopy(FT-IR), dynamic mechanical analysis(DMA), differential scanning calorimeter(DSC) and universal testing machine(UTM). After GO incorporation, the particle size of the WPU initially decreased during the dispersion step. With time, the particle size increased due to the swelling of GO. And tensile strength, young’s modulus, glass transition temperature and thermal stability of the WPU significantly increased up to 1.0wt% of GO beyond which most of the above properties showed a decrease due probably to aggregation of GO. |
