화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2004년 가을 (10/08 ~ 10/09, 경북대학교)
권호 29권 2호, p.630
발표분야 기능성 고분자
제목 An Electroactive Polymer Actuator Using Polyurethane Nanocomposites with Organoclay
초록 During the past decade, many investigators have been developed various electroactive polymers for actuators and artificial muscles. The recent development in electromechanical properties of polymers showed that some thermoplastic polymer elastomers, especially segmented polyurethane elastomers, can exhibit very high electric field induced strain response.1 This phenomenon is electrostriction that a material is strained due to both Maxwell stress effect and electrostriction effect developed by the applied voltage. In this study, polyurethanes (PUs) with flexible electrode were used as electroactive polymer actuator. Electrode layers were made by carbon black particles dispersed in waterborne PU, and coated on the both sides of PU film by spin coater.
We synthesized polyurethanes using poly(neopentyl adipate diol) (PNAD) or poly(tetramethylene glycol) (PTMG) as soft segments. PU with PTMG had higher value of ultimate stress (39.3±5MPa) than PU with PNAD (8.9±4Mpa). Also PU with PTMG had higher value of elongation at break (951.89±80%) than PU with PNAD (882.45±80%). Though PU with PTMG had better mechanical properties, it had smaller field-induce strain than that of PU with PNAD. So we introduced organically modified montmorillonite (MMT) to improve field-induced strain of pure PU. PU/MMT nanocomposites with MMT content of 5wt% had the largest displacement, and it was approximate to ten times as large as pure PU(see Figure 1).


Fig. 1. Effect of the clay content on displacement of PU/MMT nanocomposites.



References
1.Y.Bar-Cohen, Electroactive Polymer Actuators as Artificial Muscles, SPIE Press, Bellingham, WA, 2001, pp 4.
저자 김철호, 박경미, 최화정, 김범호, 박한수, 정영대, 정해도, 이장우, 조남주
소속 부산대
키워드 EAP; Polyurethane; MMT; Nanocomposite
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