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Preparation and Characterization of Ethylene Vinyl-Acetate Copolymer/Silicone Blends with Excellent Two-Way Shape Memory Properties

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Abstract

This study investigated the preparation of ethylene-vinyl acetate copolymer (EVA) and silicone rubber blends using a melt-blending method. EVA/Silicone-D blends were prepared by using peroxide (Dicumyl peroxide, DCP) as a crosslinking agent. The microstructure, thermal properties, and shape memory behavior were investigated for the EVA/Silicone-D blends. DCP not only could assist the crosslinking of EVA and silicone, but also increase the compatibility of blends. Silicone tended to endow the prepared EVA/silicone shape memory blends with high thermal stability, hydrophobicity, and recovery magnitude. The crystal orientation and crosslinking effects of EVA/Silicone-D blends played key roles in the shape memory behavior. Two-dimensional X-ray diffraction analysis revealed the increased crystal orientation with increasing loads. The one-way shape memory results demonstrated that both Rf (shape fixing ratio) and Rr (shape recovery ratio) values were above 97% after three consecutive shape memory cycles. From two-way shape memory results, it was observed that Ract, actuation magnitudes, contributed from the cooling-induced elongation increased with increasing loads and EVA contents. In addition, owing to this increased molecular orientation with increasing loads, the entropy-driven contribution relative to the overall actuation magnitudes increased accordingly. However, the shape memory response was hindered, when the load exceeded a critical value. With increasing silicone contents, the entropy-driven contribution decreased due to the reduced orientation degree at the tighter networks or increased crystalline EVA contents in the blends.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, National I-Lan University, I-Lan, 260, Taiwan, Republic of China

    Sun-Mou Lai & Pei-Yun You

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  1. Sun-Mou Lai
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  2. Pei-Yun You
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Correspondence to Sun-Mou Lai.

Additional information

Acknowledgment: The partial grants-in-aid from Yomura Technologies, Inc. and R.O.C. government under the contract number of MOST 103-2622-E197-002-CC3 are greatly acknowledged. The authors are also grateful for the help from Mrs. Yen-Ju Chen, Geng-Lun Guo, and Ms. S.-Y. Fan Jiang in the manuscript preparation.

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Lai, SM., You, PY. Preparation and Characterization of Ethylene Vinyl-Acetate Copolymer/Silicone Blends with Excellent Two-Way Shape Memory Properties. Macromol. Res. 26, 984–997 (2018). https://doi.org/10.1007/s13233-018-6134-9

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  • DOI: https://doi.org/10.1007/s13233-018-6134-9

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