THERMAL-ANALYSIS OF ETHYLENE-PROPYLENE COPOLYMER-GRAFTED-GLYCIDYL METHACRYLATE

The thermal properties of ethylene-propylene copolymer grafted with gl ycidyl methacrylate (EP-g-GMA) were investigated by using differential scanning calorimetry (DSC). Compared to the plain ethylene-propylene copolymer (EP), peak values of melting temperature (T-m) of the propyl ene sequences in the grafted EP changed a little, crystallization temp erature (T-c) increased about 8-12 degrees C, and melting enthalpy (De lta H-m) increased about 4-6 J/g. The isothermal and nonisothermal cry stallization kinetics of grafted and ungrafted samples was carried out by DSC. Within the scope of the researched crystallization temperatur e, the Avrami exponent (n) of ungrafted sample is 1.6-1.8, and those o f grafted samples are all above 2. The crystallization rates of propyl ene sequence in EP-g-GMA were faster than that in the plain EP and inc reased with increasing of grafted monomer content. It might be attribu ted to the results of rapid nucleation rate. (C) 1996 John Wiley & Son s, Inc.