Delivery Systems for Low Molecular Weight Payloads: Core/Shell Capsules with Composite Coacervate/Polyurea Membranes. Issue 23 (31st March 2017)

• Record Type: Journal Article
• Authors: Dardelle, Gregory; Jacquemond, Marlène; Erni, Philipp
• Is Part Of: Advanced materials. Volume 29:Issue 23(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-31
• Subjects: complex coacervates -- encapsulation -- microcapsules -- hybrid materials -- interfacial rheology; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201606099
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract : 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. Abstract : Pairing complex coacervation of biopolymers with interfacial polymerization of polyurea, composite core/shell capsules are formed. These delivery systems can be used to encapsulate volatile oil droplets. A polyurea layer provides a diffusion barrier in harsh media, whereas the coacervate component enhances adhesion on the targeted substrate.