Abstract
Syntheses of segmented copoly(ether-ester)s with (oxy-1,4-phenyleneoxycarbonyl-1,4-phenylenecarbonyl)/(oxy-2-methyl-1,4-phenyleneoxycarbonyl-1,4-phenylenecarbonyl) (methyl series)/(oxy-2-chloro-1,4-phenyleneoxycarbonyl-1,4-phenylenecarbonyl) (chloro series) hard segments and poly(oxytetramethylene) soft segments, are reported. The methodology consisted of sequential melt condensation of terephthaloyl chloride with poly(oxytetramethylene)glycol (M̅n=250) [POTMG] and hydroquinone (HQ)/methylhydroquinone (Me-HQ)/chlorohydroquinone (Cl-HQ). Hard segment length as well as substitution in core of hard segment were varied (H to CH3/Cl) while maintaining the soft segment length constant. Copolymers were characterised for solubility behavior and by infrared spectroscopy, X-ray diffraction, DSC and polarising microscopy. Thermal properties were found to be dependent on average length of hard segment as well as on the type of substituent in the core of hard segment. All copoly(ether-ester)s are elastomeric at room temperature (25°C). Some of the polymers synthesised exhibit thermotropic liquid crystalline behavior.
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Sonpatki, M., Ravindranath, K. & Ponrathnam, S. Segmented Copoly(ether-ester) Elastomers. Influence of Hard Segment Length and Substitution on Mesophase Formation. Polym J 26, 804–815 (1994). https://doi.org/10.1295/polymj.26.804
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DOI: https://doi.org/10.1295/polymj.26.804
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