用γ-戊内酯衍生的深共晶溶剂塑化的热塑性壳聚糖

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL
Ana Clara Lancarovici Alves, Camila Souza Santos, Antonio Carlos Bender Burtoloso, Antonio José Felix Carvalho
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引用次数: 0

摘要

一种新型多元醇来自γ-戊内酯,具有 10 个碳链和 4 个羟基,它与氯化胆碱一起用于生产一种深共晶溶剂(DES),用作壳聚糖的增塑剂。多元醇的估计沸点为 340 ℃,玻璃转化温度(Tg)为 - 6 ℃。由于多元醇的结构不对称,而且是立体异构体的混合物,因此没有观察到结晶温度。在氯化胆碱(ChCl)/多元醇的比例为 2:1 至 1:10 的范围内,检测到了共晶状态。据观察,只有氯化胆碱含量较高的混合物才显示出熔点,因此共晶成分是根据摩尔比为 1:1 的混合物所获得的最低 Tg(约 - 40 °C)来选择的。这种氯化胆碱/多元醇组合物被用来通过热压制备塑化壳聚糖薄膜。甘油/氯化胆碱混合物也被用作 DES 进行比较。这两种 DES 都是获得壳聚糖热塑性薄膜的增塑剂,未增塑薄膜的 Tg 从 165 ℃ 显著下降到 -2 ℃,而使用基于 ChCl-多元醇和 ChCl-甘油的 DES 增塑薄膜的 Tg 则分别下降到 -30 ℃。与 ChCl/甘油相比,使用 ChCl-多元醇塑化的材料模量降低了约 54%,伸长率增加了 455%,这表明多元醇基 DES 的塑化效率更高。氯化胆/多元醇的使用为壳聚糖作为塑料材料提供了新的机遇,而多元醇的高沸点使其成为一种真正的、高度稳定的增塑剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermoplastic Chitosan Plasticized with Deep Eutectic Solvent Derived from Gamma-valerolactone

Thermoplastic Chitosan Plasticized with Deep Eutectic Solvent Derived from Gamma-valerolactone

Thermoplastic Chitosan Plasticized with Deep Eutectic Solvent Derived from Gamma-valerolactone

A new polyol derived from gamma-valerolactone with 10 carbon chain and four hydroxyl groups was used in combination with choline chloride for the production of a deep eutectic solvent (DES) employed as plasticizer for chitosan. The polyol estimated boiling point was 340 °C and the glass transition temperature (Tg) was − 6 °C. No crystallization temperature was observed due to the non-symmetric structure of polyol and because it is a mixture of stereoisomers. A eutectic condition was detected in an interval of choline chloride(ChCl)/polyol composition from 2:1 to 1:10. It was observed that only the mixtures with higher ChCl content showed melting points, so the eutectic composition was chosen by the lowest Tg that was obtained by the 1:1 molar ratio mixture, circa − 40 °C. This ChCl/Polyol composition was used to prepare plasticized chitosan film, by hot pressing. The glycerol/choline chloride mixture was also used as DES for comparison purposes. Both DES acted as plasticizer to obtain chitosan thermoplastic films, verified by the significant Tg drop from 165 °C, for unplasticized film, to -2 °C and − 30 °C, for films plasticized with DES based on ChCl-polyol and ChCl-glycerol, respectively. The materials plasticized with ChCl-polyol, showed a decrease in modulus of about 54% and an increase of 455% in elongation compared to ChCl/Glycerol, indicating better plasticization efficiency of the polyol based DES. The use of ChCl/Polyol have opened up a new opportunity for the use of chitosan as a plastic material and the high boiling point of polyol has made it a real and highly stable plasticizer.

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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
期刊介绍: The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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