INFRARED SPECTROSCOPIC CHARACTERIZATION OF THE CRYSTALLINITY AND THE HYDROCARBON CHAIN PACKING OF THE POLYETHYLENE SEGMENTS IN POLY(ETHYLENE-CO-DIMETHYLAMINOETHYL METHACRYLATE)

The multicrystalline behaviour and the crystallinity of poly(ethylene- co-dimethylaminoethyl methacrylate) were investigated by infrared spec troscopy. The metastable monoclinic packing structure of the polyethyl ene segments of the copolymers usually co-exists with the stable ortho rhombic form in the isotropic samples. The reason for the occurrence o f this multicrystalline structure is discussed. The relative content o f the monoclinic form in the crystalline regions changed greatly with the co-unit contents and the crystallization conditions. The crystalli nity of the samples was also estimated by spectroscopic methods.