PEO-PPO-PEOをベ-スとする抗血栓性ポリウレタンウレアの組成と引張特性の関係

概要

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It has been previously reported that a series of segmented polyetherurethaneureas (DPs) prepared from hydroxy terminated triblock copolyether (BPE, PEO-PPO-PEO), 4, 4′-diphenylmethane diisocyanate (MDI) and ethylene diamine (E) exhibited an excellen antithrombogenicity and a long-term durability. In this study, the effect of the composition of soft and hard segments (SS & HS) on the tensile properties of 22 different DPs was discussed from the stress-strain data plotted according to the Mooney-Rivlin equation. No significant differences of the value of C1 terms were found by change in the content of HS, when the same BPE was used. And the C2 values were approximately proportional to the content of HS. The C2/C1 values were higher than those for vulcanized rubbers. Generally, the glass transition temperature (T2) of SS in polymer reflects the extent of microphase separation of soft and hard domains. On the series of DPs having the same content of HS and the different chain lengths of SS, the values of C2 term increased with an increase in the Tg of SS, but the values of C1 term were almost independent of the Tg of SS. This may imply that the variation of phase separation affects mainly the value of C2. The antithrombogenicity of DPs was also discussed from a viewpoint of their microphase separation and their hydrophilicity.
日本ゴム協会の論文