Preparation and characterization of graft copolymer EVA-g-PU

摘要

Via melting graft reaction, a new type of graft copolymer EVA-g-PU was synthesized. The Characterization of FTIR and 13 C-NMR indicated that polyether-polyurethane prepolymer was grafted on the EVA main chain successfully. Gel content Test showed that the crosslinking structure does exist in EVA-g-PU. EVA-g-PU showed significant enhancement in shear viscosity. Differential scanning calorimetry (DSC) testing showed that the melting temperature increased with the increase of PU prepolymer content. The enhanced storage modulus of EVA-g-PU was characterized by dynamic mechanical thermal analysis (DMA). The enhanced degree in the storage modulus of EVA-g-PU increased with the increase of PU prepolymer content. The thermal stabilities of EVA-g-PU were also studied by thermal gravimetric analysis (TGA).