화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.17, No.10, 785-790, October, 2009
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A Comparative Study on the Dielectric and Dynamic Mechanical Relaxation Behavior of the Regenerated Silk Fibroin Films
In Chul Um, Tae Hee Kim1, Hae Yong Kweon2, Chang Seok Ki3, and Young Hwan Park3, †
  • Department of Natural Fiber Science, Kyungpook National University, Daegu 702-701, Korea
  • 1Department of Bioengineering, University of Washington, 1705 NE Pacific Street, Seattle, Washington 98195, USA
  • 2Sericultural & Apicultural Materials Division, National Academy of Agricultural Science, RDA, Suwon 441-100, Korea
  • 3Department of Biosystems and Biomaterials Sciences and Engineering, Seoul National University, Seoul 151-921, Korea
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In this paper, the relaxation behavior of the regenerated silk fibroin (SF) films was investigated using dielectric thermal analysis (DETA), and compared with the dynamic mechanical behavior obtained from dynamic mechanical thermal analysis (DMTA), in order to gain a better understanding of the characteristics of dielectric behavior of SF film and identify the differences between the two analyses. Compared to DMTA, DETA exhibited a higher sensitivity on the molecular relaxation behaviors at low temperature ranges that showed a high γ-relaxation peak intensity without noise. However, it was not effective to examine the relaxation behaviors at high temperatures such as α- and αc-relaxations that showed a shoulder peak shape. On the contrary, DMTA provided more information regarding the relaxation behaviors at high temperatures, by exhibiting the changes in width, intensity and temperature shift of the α-relaxation peak according to various crystallinities. Conclusively, DETA and DMTA can be utilized in a complementary manner to study the relaxation behavior of SF over a wide temperature range, due to the different sensitivity of each technique at different temperatures.
Keywords:regenerated silk fibroin;dielectric thermal analysis;dynamic mechanical thermal analysis
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