几种典型固体聚合物体系的^（13）C自旋－晶格弛豫特性

13 C SPIN-LATTICE RELAXATION PROPERTIES OF SEVERAL TYPICAL POLYMER SYSTEMS IN SOLID

用固体高分辨ＮＭＲ系统地研究了几种典型的均聚物，共聚物，聚合物共混物以及用接枝共聚物增容的不相容聚合物共混体系的１３Ｃ自旋－晶格弛豫特性。研究结果表明：１３Ｃ自旋－晶格弛豫时间（Ｔ１（Ｃ））是表征固体聚合物体系的很有用参数，它能提供有关本体聚合物微观形态结构的信息，并可望建立聚合物的微观结构与宏观性能的关系，它不仅能准确无误地反映共混体系中可能存在的各种相互作用，而且能定性地给出相互作用的大小和准确地指明相互作用产生的位置，因而为揭示共混体系的相容机理提供了最直接的证据。

C 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 sys￣tem, it can also qualitatively show the strength of the intermolecular interaction and accurately indicate the site where the intermolecular interaction occurs. Therefore, it can provide a direct experimental evidence for exploring the miscible mechanism of a polymer blend .Besides, T 1(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.