Quantitative analysis of the cross-linked structure of microgels using fluorescent probes

Autor:	Hyunjoon Kong, Cathy Chu, Brian W. Schaefer, Ross J. DeVolder
Rok vydání:	2009
Předmět:	Acrylate polymer chemistry.chemical_classification Polymers and Plastics Organic Chemistry Analytical chemistry Fluorescence spectrometry Polymer Excimer chemistry.chemical_compound Monomer chemistry Self-healing hydrogels Materials Chemistry Pyrene Ethylene glycol
Zdroj:	Polymer. 50:5288-5292
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2009.09.019
Popis:	Properties of polymeric microgels are influenced by the internal polymer cross-linked structure, but tools to quantitatively analyze this internal structure are limited. With the finding that polymer networks alter the diffusivity and subsequent excimer formation of pyrene, this study used the ratio between pyrene excimer and monomer emission to determine the number of cross-links (N) and average pore size (ξ) in poly(ethylene glycol) diacrylate (PEGDA) microgels. A calibration curve to relate pyrene emission to N and ξ in PEGDA hydrogels was prepared and used to calculate N and ξ in PEGDA microgels. The pyrene emission indicated that PEGDA microgels had a higher cross-linking density and a smaller average pore size when compared with bulk cross-linked hydrogels of the same PEGDA concentration. The analytical method demonstrated in this study may be useful for fine-tuning polymeric microgel properties for a broad array of applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d8e36fb6424173ded41b03cbb265fb1a https://doi.org/10.1016/j.polymer.2009.09.019 Zobrazit plný text záznamu Full Text from ScienceDirect