| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 105 === Triple-shape memory amine cured EP/PCL blends modified with Phenoxy and HNT were prepared in this study to improve the critical drawback of EP/PCL blends which exhibited not overall excellent shape memory performance, recover ratio and fixity ratio.
An attempt was made to achieve better shape memory (SM) behavior by a hydrogen bonding interaction between the PCL carbonyl group and the Phenoxy hydroxyl group. PCL and Phenoxy are miscible in the amorphous state. Forming the hydrogen bonding may increase the amount of hard segments and enlarge the stored force to recover to the permanent shape. Moreover, Phenoxy also react with epoxide of EP, enhancing the amount of hard segment in the cross-linked network. By the same concepts, this research tries to add comparatively hard inorganic material, HNT, to compare the efficiency of these two modifying methods.
We adjusted the concentrations of Phenoxy and HNT as 0、1、5 and 10 wt%, respectively. To set the two temporary shapes, the glass transition temperature (Tg) of 32oC of the EP and the melting temperature (Tm) of 58oC of PCL were served during the SM cycle. These transition temperatures are easy to reach for the real application. Results show that both Phenoxy and HNT can improve the SM efficiency. The highest recovery ratio reach to 89.0% and 99.9% of two shape by the HNT 5 wt% adding. At the same time, keeping the high shape fixing ratio around 99%.
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