Mesomorphic properties of copolyesters of 3,6-linked triphenylene-based units and polymethylene spacers
| العنوان: | Mesomorphic properties of copolyesters of 3,6-linked triphenylene-based units and polymethylene spacers |
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| المؤلفون: | Yo Shimizu, Yuko Tanaka, Wen Wan, Hirosato Monobe |
| المصدر: | Liquid Crystals. 30:571-578 |
| بيانات النشر: | Informa UK Limited, 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Materials science, Mesogen, Mesophase, Triphenylene, General Chemistry, Polymer, Condensed Matter Physics, chemistry.chemical_compound, Crystallography, Monomer, chemistry, Liquid crystal, Organic chemistry, General Materials Science, Columnar phase, Alkyl |
| الوصف: | Main chain discotic liquid crystalline polymers consisting of triphenylene-based units and alkyl spacers (C8, C10 and C12), connected by ester linkages in the 3- and 6-positions of triphenylene, have been synthesized and their mesomorphic properties were studied by DSC, polarizing optical microscopy and X-ray diffraction. It was found that these polymers exhibit a hexagonal columnar (Colh) mesophase with intracolumnar order over a wide temperature range. The clearing temperature decreases on increasing the spacer length. It was found that the clearing temperatures are rather higher than that of the corresponding triphenylene monomer having six hexyloxy chains. These polymers form an ordered columnar mesophase, while the corresponding monomeric mesogen shows a disordered columnar phase. In the polymeric system, the fluctuations of the disc-like units in the mesophase are restricted by the connection of the mesogenic units, which stabilizes the columnar mesophase. |
| تدمد: | 1366-5855 0267-8292 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::e270b597b9828d93271386be128e81efTest https://doi.org/10.1080/0267829031000099608Test |
| رقم الانضمام: | edsair.doi...........e270b597b9828d93271386be128e81ef |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13665855 02678292 |
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