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首页> 外文期刊>Journal of Applied Polymer Science >Characterization and mechanical properties of ultraviolet stimuli-responsive functionalized cellulose nanocrystal alginate composites
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Characterization and mechanical properties of ultraviolet stimuli-responsive functionalized cellulose nanocrystal alginate composites

机译：紫外刺激官能化纤维素纳米晶藻酸盐复合材料的表征和力学性能

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摘要

The poor mechanical properties of alginate when exposed to aqueous solution have been a problem plaguing researchers within the biomedical field. In order to be able to improve the mechanical properties in a systematic manner functionalized cellulose nanocrystals (CNCs) were added to alginate and UV-induced crosslinked following an azo-initiated free radical polymerization. CNCs were functionalized with 4-pentenoic acid (PA-g-CNCs) using a simple, environmentally friendly solvent-free esterification. The dimensional and crystallinity properties of PA-g-CNCs remained unchanged following esterification. Thermogravimetric analysis, Fourier transform infrared spectroscopy, and C-13 nuclear magnetic resonance indicated that 4-pentenoic acid was present on the surface of CNCs through bulk analysis. These PA-g-CNCs were then used in the creation of composites with an azo-initiator to induce UV-dependent crosslinking for the improvement of the mechanical properties of alginate. It was shown that the properties of alginate can be enhanced with the addition of functionalized CNCs to nanocomposites in mechanical testing in wet and dry conditions. These results suggest that the addition of PA-g-CNCs and crosslinking by UV-dependent free radical polymerization improves the performance of alginate when tested in dry conditions, but without any apparent dependence to azo-initiated crosslinking when exposed to water in regards to mechanical properties. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45857.
机译：在暴露于水溶液时，藻酸盐的机械性能差是生物医学领域内的研究人员的问题。为了能够改善以系统的方式的机械性能官能纤维素纳米晶体（CNC控制器）加入到藻酸盐和UV诱导的以下的偶氮 - 引发的自由基聚合交联。使用简单的环保型无溶剂酯化用4-戊烯酸（PA-G-CNC）官能化CNC。酯化后，PA-G-CNCs的尺寸和结晶性能保持不变。热重分析，傅里叶变换红外光谱和C-13核磁共振表明，通过批量分析存在4-戊烯酸在CNC的表面上存在。然后将这些PA-G-CNC用于产生具有偶氮引发剂的复合材料中，以诱导UV依赖性交联以改善藻酸盐的机械性能。结果表明，在湿法和干燥条件下，可以通过将官能化的CNC添加到纳米复合材料中的官能化CNC来增强藻酸盐的性质。这些结果表明，当在干燥条件下测试时，通过UV依赖性自由基聚合添加PA-G-CNCs和交联改善了藻酸盐的性能，但是当在机械上暴露于水时，没有对偶氮引发的交联的任何明显依赖。特性。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45857。

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