Green Hydrophilic Capsules from Cellulose Nanocrystal-Stabilized Pickering Emulsion Polymerization: Morphology Control and Spongelike Behavior
Green Hydrophilic Capsules from Cellulose Nanocrystal-Stabilized Pickering Emulsion Polymerization: Morphology Control and Spongelike Behavior
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DOI：
10.1021/acs.biomac.1c00581
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发表时间：
2021-07-14
影响因子：
6.2
通讯作者：
Schmitt, Veronique
中科院分区：
文献类型：
--
作者：
Dupont, Hanae;Laurichesse, Eric;Schmitt, Veronique
采用表面改性的纤维素纳米晶（CNCs）作为稳定粒子，在生物友好的肉豆蔻酸异丙酯中稳定羟基低聚乙二醇甲基丙烯酸酯的Pickering反相乳液。乳液进一步聚合自由基或控制自由基聚合（ATRP），利用溴异丁酸酯功能接枝在CNC表面上。乳液的悬浮聚合导致全珠或空胶囊形态，这取决于引发位点。通过调节表面改性后纳米纤维的聚集状态，可以调节聚合乳液周围纳米纤维壳层的厚度。CNC层从6层增加到40层有助于将珠粒的压缩模量从十几kPa提高到几百kPa。
Pickering inverse emulsions of hydroxyl oligoethylene glycol methacrylate were stabilized in isopropyl myristate, a biofriendly oil, using surface-modified cellulose nanocrystals (CNCs) as stabilizing particles. The emulsions were further polymerized by free or controlled radical polymerization (ATRP), taking advantage of the bromoisobutyrate functions grafted on the CNC surface. Suspension polymerization of the emulsion led to full bead or empty capsule morphologies, depending on the initiation locus. The thickness of the CNC shell surrounding the polymerized emulsions could be tuned by modulating the aggregation state of the CNCs after their surface modification. An increase from 6 to 40 CNC layers helped improve the compression moduli of the beads from a dozen to hundreds of kPa.