Formation of Tectocapsules by Assembly and Cross-linking of Poly(divinylbenzene-alt-maleic anhydride) Spheres at the Oil−Water Interface

Abstract

Novel tectocapsules were prepared by interfacial assembly and covalent cross-linking of poly-(divinylbenzene-alt-maleic anhydride) microspheres at the oil-water interface. Dispersions of the anhydride-functional microspheres in a range of organic core solvents, including xylene and propyl acetate and their mixtures, were in turn suspended in a continuous aqueous phase. Addition of polyethylenimines with number average molecular weights ranging from about 200 to about 100 000 to the aqueous phase led to the formation of up to 200 µm diameter tectocapsules, having walls comprised of cross-linked microspheres. The effects of microsphere loading, composition and solubility parameter of the core solvents, type of amine, and rate of amine addition on wall morphology are discussed.

Synthesis of Nano/Microstructures at Fluid Interfaces

“…[81] A similar approach was used by Croll et al to prepare colloidosomes with 0.6 mm poly(divinylbenzene-alt-maleic anhydride) particles. [82] He et al also described the production of colloidosomes with sulfonated PS particles. [83][84][85] Furthermore, poly(methyl methacrylate-co-acrylic acid) latex particles could be used to generate pH-sensitive colloidosomes.…”

Synthese von Nano‐/Mikrostrukturen an fluiden Grenzflächen

“…Außerdem wurden an Wasser-Öl-Grenzflächen auch hoch geordnete Filme aus Graphen-Schichten, [72] dünne Filme aus einwandigen Kohlenstoffnanoröhren [73][74][75][76][77] sowie orientierte Filme aus Kristalliten von schichtförmigen Seltenerdmetallhydroxiden [78] hergestellt. [82] He et al berichteten auch über die Herstellung von Kolloidosomen mit sulfonierten PS-Partikeln. [83][84][85] Außerdem konnten Poly(methylmethacrylat-coacrylsäure)-Latexpartikel zur Erzeugung von pH-empfindlichen Kolloidosomen verwendet werden.…”

Chemical Mapping of Polymer Microstructure Using Soft X‐Ray Spectromicroscopy

“…[26] Recently we have combined two different encapsulation technologies-microspheres and capsules-in an assembled composite, or 'tectocapsule'. [24,25] In this novel approach to controlled release, the barrier functionality is provided by the capsule chemistry, while the release functionality is provided by the properties of porous microspheres embedded in an otherwise impermeable capsule wall. The polyurea capsules are generated through interfacial polymerization in an emulsion.…”

“…Use of a maleic anhydride acid linker greatly improved the microstructure, with the microspheres penetrating but sitting mostly on the outside of the capsule wall. [24,25] We used STXM to explore the spatial distribution of the acid linker, and thus to optimize its efficiency at controlling the assembly. Fig.…”

“…[24,25] Optimization of alginate microcapsules being developed for gene therapy applications. [26] Conducting polymers undergoing thermochromic transitions.…”