Preparation of initiator and cross-linker-free poly(N-isopropylacrylamide) nanogels by photopolymerization

Autor:	Zhang Zhenjia, Yao Side, Qiao Xiangli
Rok vydání:	2006
Předmět:	Reaction mechanism General Chemical Engineering General Physics and Astronomy General Chemistry chemistry.chemical_compound Monomer Photopolymer Pulmonary surfactant chemistry Polymerization Yield (chemistry) Polymer chemistry Poly(N-isopropylacrylamide) Cross linker
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 177:191-196
ISSN:	1010-6030
DOI:	10.1016/j.jphotochem.2005.05.025
Popis:	Poly(N-isopropylacrylamide) or PNIPAm nanogels with diameter of 50–200 nm were prepared from N-isopropylacrylamide monomer by photopolymerization in the absence of initiator, cross-linker and surfactant. Morphology transition of the nanogels from branch to compact, global one was tuned with NIPAm(N-isopropylacrylamide) concentration in reaction. Reaction mechanism of the nanogels formation was proposed. The yield of prepared nanogels can increased from ca. 20 up to 86% when solution pH varied from neutral to 2. ESR signals confirmed that the existence of H+ in reaction could accelerate the polymerization of NIPAm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9707d92da06ea531780cd49a708e7284 https://doi.org/10.1016/j.jphotochem.2005.05.025 Zobrazit plný text záznamu Full Text from ScienceDirect