Firmenich SA, Materials Science Department, Corporate Research Division, 1217, Meyrin 2, Geneva, Switzerland.
Adv Mater. 2017 Jun;29(23). doi: 10.1002/adma.201606099. Epub 2017 Mar 31.
Composite polyurea/coacervate core/shell capsules are formed by coupling associative biopolymer phase separation with interfacial polymerization. They combine the excellent chemical stability of synthetic polymer barriers with the strong adhesive properties of protein-based complex coacervates, inspired by biological underwater glues. To encapsulate volatile oil droplets, a primary coacervate hydrogel capsule is formed by a protein and weak polyanion and is reinforced with a polyurea membrane synthesized in situ at the interface between the coacervate and the oil core. The polyurea layer provides an excellent permeability barrier against diffusion of small volatile molecules while the coacervate portion of the shell enhances adhesion on the targeted substrate.
复合聚脲/共凝聚体核/壳胶囊是通过将缔合生物聚合物相分离与界面聚合相结合而形成的。它们结合了合成聚合物屏障的优异化学稳定性和基于蛋白质的复杂共凝聚物的强粘附性能，灵感来自于生物水下胶。为了封装挥发性油滴，通过蛋白质和弱聚阴离子形成初级共凝聚体水凝胶胶囊，并通过在共凝聚体和油芯之间的界面原位合成的聚脲膜进行增强。聚脲层提供了对小分子挥发性分子扩散的极佳渗透屏障，而壳的共凝聚体部分增强了对目标基底的粘附性。
