Semiflexible random thermotropic copolymers from 8-(3-hydroxy phenyl) octanoic acid and 3-chloro-4-hydroxy benzoic acid/3,5-dibromo-4-hydroxy benzoic acid

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dc.contributor.authorMitra, S
dc.contributor.authorPillai, CKS
dc.date.accessioned2017-03-10T03:28:32Z
dc.date.available2017-03-10T03:28:32Z
dc.date.issued2008
dc.description.abstractTwo series of semiflexible random thermotropic copolymers containing 8-(3-hydroxy phenyl) octanoic acid (HPOA) with either 3-chloro-4-hydroxy benzoic acid or 3,5-dibromo-4-hydroxy benzoic acid were prepared by melt polycondensation techniques. The copolyesters were characterized with Fourier transform infrared spectroscopy, dilute solution viscometry, hot-stage polarized light microscopy, differential scanning calorimetry, thermogravimetric analysis, and wide-angle X-ray diffraction. Studies revealed that the amount of HPOA as a disruptor incorporated into the backbone of substituted 4-hydroxy benzoic acids had a detrimental effect on the liquid-crystalline behavior. Mesophase-transition temperatures were observed between 210 and 250 degrees C, and the optical textures were of typical nematic phases. The degree of crystallinity decreased with an increase in the HPOA content. The thermal stability of the copolymers was in the range of 310-370 degrees C. (C) 2007 Wiley Periodicals, Inc.
dc.identifier.citation107 ,2;778-783en_US
dc.identifier.uri10.1002/app.27128
dc.identifier.urihttps://dspace.sctimst.ac.in/handle/123456789/10415
dc.publisherJOURNAL OF APPLIED POLYMER SCIENCE
dc.subjectPolymer Science
dc.titleSemiflexible random thermotropic copolymers from 8-(3-hydroxy phenyl) octanoic acid and 3-chloro-4-hydroxy benzoic acid/3,5-dibromo-4-hydroxy benzoic acid
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