Liquid crystalline polyesters by staged-addition polycondensation
ISSN: |
1436-2449
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Source: |
Springer Online Journal Archives 1860-2000
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Topics: |
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Physics
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Notes: |
Summary A series of model liquid crystalline (LC) polyesters have been prepared by low temperature solution polycondensation using staged addition methods. The model thermotropic polyesters were composed of aliphatic spacers and mesogenic groups made from substituted terephthalic acid and methyl hydroquinone. Both the mesogenic groups and the spacers were placed in the main chain. Attractive properties of these polymers include solubility in many organic solvents such as THF and DMSO with softening temperatures below 150°C. Some of these polymers show no melting transitions, and depending on the terephthalate group substituent, either smectic or nematic phases are formed. Results from GPC analysis show good solubility of polymers in THF with Mw lower than 10,000 compared to polystyrene standards. The synthesis and characterization of these LC polyesters are reported here.
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Type of Medium: |
Electronic Resource
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URL: |