Abstract
Poly[ethylene 4, 4′-(1, 2-ethanediyldioxy) bis (3-ethylbenzoate)] [o-Et type polyester-ether], which is the ethylene glycol polyester of 1, 2-bis(4-carboxy-2-ethylphenoxy) ethane having the ethyl substituents in the ortho-position on the benzene nuclei to the ester linkages, was successfully synthesized.The crystallizability and the thermal properties of this polymer were investigated by use of X-ray analysis, infrared analysis, differential scanning calorimetry and estimation of the rate of crystallization.It was shown that [o-Et] was crystalline and melt-spinnable. Its physical properties were as follows. Crystal melting temperature, 170°C; Glass transition temperature, 52°C; Half-time crystallization at 140°C, 5400 sec.; Fiber identity period, 18.7 A.
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