Single‐step process to produce functionalized multiresponsive polymeric particles |
| |
Authors: | Antoine Bousquet Emmanuel Ibarboure ValÉRie HÉRoguez Eric Papon Christine Labrugere Juan Rodríguez‐Hernández |
| |
Institution: | 1. Laboratoire de Chimie des Polymères Organiques (LCPO), CNRS, Université Bordeaux I, ENSCPB. 16, Avenue Pey Berland, 33607, Pessac‐Cedex, France;2. Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB‐CNRS), 87, Av. Albert Schweitzer 33600, Pessac, France;3. Instituto de Ciencia y Tecnología de Polímeros (ICTP‐CSIC) C/ Juan de la Cierva n°3 28006 Madrid, Spain |
| |
Abstract: | Monodisperse functional multiresponsive particles were prepared by encapsulation of an amphiphilic diblock copolymer during the precipitation polymerization of polystyrene and divinylbenzene in one single step. The amphiphilic diblock copolymer employed throughout this study, polystyrene‐b‐poly (dimethylaminoethyl methacrylate) (PS‐b‐PDMAEMA) has been synthesized by ATRP in two consecutive polymerization steps. After encapsulation of the block copolymer within the microsphere, the surface modification of the particle occurs spontaneously upon exposure to water by surface segregation of the hydrophilic PDMAEMA block, thus without any additional post‐polymerization and/or chemical modification steps. The response of the functionalized particles both to pH and temperature was analyzed by potential zeta and DSC measurements. Upon dispersion of the particles in acidic media, the PDMAEMA block in its charged state is soluble and does not exhibit any change by heating. At higher pH values and temperatures above 35 °C (Low Critical Solubility Temperature of the PDMAEMA block) the hydrophilic segment collapses as detected by differential scanning calorimetry. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 3523–3533, 2010 |
| |
Keywords: | block copolymers cross‐linking stimuli‐sensitive polymers |
|
|