The Electrostrictive Response of Polyester-Based Polyurethane Elastomers

• Published in: KOBUNSHI RONBUNSHU Vol. 56; no. 11; pp. 725 - 731
• Main Authors: LIN, Hohei, KOJIMA, Kenzo, ASAI, Kiyotsugu, INOUE, Shin-ichi, OKAMOTO, Hiroshi
• Format: Journal Article
• Language: Japanese
• Published: Tokyo The Society of Polymer Science, Japan 01.01.1999; Tsukiji daisan nagaoka
• Subjects: Electrostriction Coefficients; Ester Segment; OH Group; Poly (3-methyl-pentamethylene adipate); Polyester-Based Polyurethane Elastomers; Transition Temperature; Trimethylhexamethylene Diisocyanate; Trimethylolpropane; Urethane Segment
• ISSN: 0386-2186; 1881-5685; 1881-5685
• DOI: 10.1295/koron.56.725

The electrostrictive response of polyester-based polyurethane elastomers (PUEs) was experimentally investigated. The influence of diisocyanate on electrostrictive effect was studied using 4, 4′-diphenylmethane diisocyanate (MDI) and trimethylhexamethylene diisocyanate (TMHDI). Prepolymers were prepared from diisocyanate and poly (3-methyl-pentamethylene adipate) (PMPA). The molar ratio of diisocyanate to PMPA was 2. PUEs were synthesized by the reaction of the prepolymers with trimethylolpropane (TMP). TMHDI-based PUEs had much larger electrostriction coefficients than MDI-based PUEs. Moreover, the influence of OH group number in an urethane segment on the electrostrictive effect was studied on PUEs prepared under 1.0, 0.75, and 0.67 in the ratio of NCO eq. number of prepolymer to OH eq. number of TMP. TMHDI-based PUE with one OH group in the urethane segment had a larger electrostriction coefficient. The results showed that making the interaction of urethane segment with ester segment weaker, introducing a polar group like OH group into urethane segment and lowering the transition temperature of urethane segment below a measuring temperature of electrostriction are very useful ways for the improvement of electrostrictive effects in polyester-based PUE.