Honeycomb Organization of Chitin Nanocrystals (ChNCs) in Nanocomposite Films of UV-Cured Waterborne Acrylated Epoxidized Soybean Oil Emulsified with ChNCs,Biomacromolecules

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Honeycomb Organization of Chitin Nanocrystals (ChNCs) in Nanocomposite Films of UV-Cured Waterborne Acrylated Epoxidized Soybean Oil Emulsified with ChNCs
Biomacromolecules ( IF 5.5 ) Pub Date : 2021-08-30 , DOI: 10.1021/acs.biomac.1c00612
Fatma Ben Cheikh ₁ , Ayman Ben Mabrouk ₁ , Albert Magnin ₂ , Christine Lancelon-Pin ₃ , Jean-Luc Putaux ₃ , Sami Boufi ₁

Affiliation

Stable biobased waterborne Pickering dispersions of acrylated epoxidized soybean oil (AESO) were developed using chitin nanocrystals (ChNCs) as sole emulsifier without any additives. Thin AESO-ChNC nanocomposite films were produced by UV-curing thin-coated layers of the AESO emulsion after water evaporation. The kinetics of photopolymerization were assessed by monitoring the consumption of the AESO acrylate groups by infrared spectroscopy (Fourier transform infrared (FTIR)). The curing was faster in the presence of ChNCs, with a disappearance of the induction period observed for neat AESO. The coating of AESO droplets with a thin layer of ChNCs was confirmed by scanning electron microscopy (SEM) observation. SEM and transmission electron microscopy (TEM) images revealed the honeycomb organization of ChNCs inside the cured AESO-ChNC films. The mechanical, thermal, and optical properties of the nanocomposite films were studied by dynamic mechanical analysis (DMA), tensile testing, differential scanning calorimetry (DSC), and transmittance measurement, as a function of ChNC content. The inclusion of ChNCs is strongly beneficial to increase the stiffness and strength of the cured films, without compromising its optical transparency. The ability of ChNCs to act as an emulsifier for AESO in replacement of synthetic surfactants and their strong reinforcing effect in UV-cured films offer new opportunities to produce waterborne stable dispersions from AESO for application in biobased coatings and adhesives.

中文翻译：

几丁质纳米晶体（ChNCs）在紫外固化水性丙烯酸环氧化大豆油纳米复合膜中的蜂窝状组织，ChNCs乳化

使用几丁质纳米晶体 (ChNCs) 作为唯一的乳化剂，没有任何添加剂，开发了稳定的生物基水性皮克林丙烯酸酯化环氧化大豆油 (AESO) 分散体。AESO-ChNC 纳米复合薄膜是通过在水蒸发后对 AESO 乳液的薄涂层进行紫外线固化来生产的。通过红外光谱（傅里叶变换红外 (FTIR)）监测 AESO 丙烯酸酯基团的消耗来评估光聚合的动力学。在 ChNC 存在下固化更快，观察到纯 AESO 的诱导期消失。通过扫描电子显微镜（SEM）观察证实了具有 ChNCs 薄层的 AESO 液滴涂层。SEM 和透射电子显微镜 (TEM) 图像揭示了固化的 AESO-ChNC 膜内的 ChNC 的蜂窝状组织。通过动态力学分析 (DMA)、拉伸测试、差示扫描量热法 (DSC) 和透射率测量，研究了纳米复合薄膜的机械、热和光学性能，作为 ChNC 含量的函数。ChNCs 的加入非常有利于提高固化膜的刚度和强度，而不影响其光学透明度。ChNCs 作为 AESO 的乳化剂替代合成表面活性剂的能力及其在紫外线固化薄膜中的强大增强作用为从 AESO 生产水性稳定分散体提供了新的机会，以用于生物基涂料和粘合剂。和透射率测量，作为 ChNC 含量的函数。ChNCs 的加入非常有利于提高固化膜的刚度和强度，而不影响其光学透明度。ChNCs 作为 AESO 的乳化剂替代合成表面活性剂的能力及其在紫外线固化薄膜中的强大增强作用为从 AESO 生产水性稳定分散体提供了新的机会，以用于生物基涂料和粘合剂。和透射率测量，作为 ChNC 含量的函数。ChNCs 的加入非常有利于提高固化膜的刚度和强度，而不影响其光学透明度。ChNCs 作为 AESO 的乳化剂替代合成表面活性剂的能力及其在紫外线固化薄膜中的强大增强作用为从 AESO 生产水性稳定分散体提供了新的机会，以用于生物基涂料和粘合剂。

更新日期：2021-09-13

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