13C spin-lattice relaxation times (T 1(C)) of several typical polymers

copolymers

polymer blends and immiscible blends compatibilized by graft copolymer have been measured by 13 C CPMAS NMR technique. The results show that T 1(C) is auseful parameter for characterizing solid polymers

as it can provide information about microscopic morphologic structure and molecular motion of solid polymers. It not only can tell whether or not some intermolecular interactions exist in a blend system

it can also qualitatively show the strength of the intemolecular interaction and accurately indicate the site where the intermolecular initeration occurs.Therefore

it can procide a direct experimental evidence for exploring the miscible mechanism of a polymer blend.Besides

T1(C) value can give a direct experimental evidence

which can not be obtained so far by other techniques

for compatibilizers connecting the two immiscible components.