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Studies on mesomorphic behaviors of segmented azoxy polyester containing polyoxyethylene
Author(s) -
Huang Jaine Ming,
Kuo Jen Feng,
Chen Chuh Yung
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070550809
Subject(s) - mesophase , thermotropic crystal , differential scanning calorimetry , liquid crystal , copolymer , materials science , polyester , texture (cosmology) , intermolecular force , polarized light microscopy , polymer chemistry , crystallography , polymer , chemical engineering , composite material , chemistry , organic chemistry , thermodynamics , molecule , liquid crystalline , optics , physics , optoelectronics , image (mathematics) , artificial intelligence , computer science , engineering
A series of a segmented copolymer, poly(4,4′‐dioxy‐2,2′‐dimethyl‐azoxybenzene dodecanedioyl)‐ co ‐polyoxyethylene 400 (PMABD‐ co ‐POE) was prepared; the average chain lengths n , of the PMABD studied are 8.1 to 20.6. The thermotropic properties and the mesophase texture of the segmented copolymers were elucidated as functions of n using a differential scanning calorimeter and a polarized optical microscope with a hot stage. The results show that the incorporation of POE with PMABD decreases the intermolecular interaction force and changes the chain flexibility. The nematic droplets obtained near the isotropic temperature all exhibited a twisted bipolar configuration. Also, in the undercooling process, the nematic textures obtained before crystallizing varied with n . The copolymers containing n ≥ 17, like PMABD, develop a Schlieren texture, whereas those containing n < 17 develop a distorted‐stripe conformation. A possible mechanism for interpretation of the obtained results has been proposed. © 1995 John Wiley & Sons, Inc.