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Polymers 2016, 8(12), 444;

Investigations on Green Blends Comprising Biodegradable Polymer and Ionic Liquid

Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Shiao-Wei Kuo
Received: 12 October 2016 / Revised: 13 December 2016 / Accepted: 14 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Polymer Blends 2017)
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The green blends of an ionic liquid, 1-ethyl-3-propylimidazolium bis(trifluoromethanesulfonyl)imide {[EPrI][TFSI]}, and a biodegradable polymer, poly(3-hydroxybutyrate) (PHB), were investigated in this study. The influence of an ionic liquid on the crystallization behaviors of a biodegradable polymer was explored. In the blends, the presence of [EPrI][TFSI] decreased the Tg and Tm of PHB. Incorporating [EPrI][TFSI] in the blends reduced the degree of crystallinity of PHB, inferring that the [EPrI][TFSI] weakened the crystallization of PHB. It further showed retarded isothermal and non-isothermal crystallization for PHB with the presence of [EPrI][TFSI]. The smaller K and 1/t0.5 estimated by the Avrami equation for the blends indicated that [EPrI][TFSI] weakened the isothermal crystallization of PHB with exhibiting the slower crystallization rate. The present study also discussed non-isothermal crystallization of the blends. We found that the Mo model, which is generally used to discuss the non-isothermal crystallization, adequately described the non-isothermal behaviors of the [EPrI][TFSI]/PHB blends. By increasing the [EPrI][TFSI] content, the rate-related parameter F(T) systematically increased, inferring a decreased crystallization rate of PHB with the addition of [EPrI][TFSI] in the blends. The FTIR results suggested an ion–dipole interaction between [EPrI][TFSI] and PHB. This proposes the occurrence of possible complexation between [EPrI][TFSI] and PHB. View Full-Text
Keywords: blends; biodegradable polymer; crystallization behaviors; specific interactions; poly(3-hydroxybutyrate) blends; biodegradable polymer; crystallization behaviors; specific interactions; poly(3-hydroxybutyrate)

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, L.-T.; Yang, C.-T. Investigations on Green Blends Comprising Biodegradable Polymer and Ionic Liquid. Polymers 2016, 8, 444.

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