Reptation movements of extended macromolecules in highly oriented liquid-crystalline polymers

摘要: In thermotropic rigid-chain LC polymers, spontaneous changes in their order at elevated temperatures are due to specific mobility of extended macromolecules, which accomplish high-frequency conformational movements a rather confined space. terms the tube model, reptational longitudinal displacements macromolecules were determined as function time on basis NMR data obtained for copolymer 4-hydroxybenzoic and 6-hydroxy-2-naphthoic acids. Relation between reptation rate times structural rearrangements was discussed; it shown that snakelike motion rigid chains could be visualized quantitatively estimated.