Quantitative analysis of the cross-linked structure of microgels using fluorescent probes
Quantitative analysis of the cross-linked structure of microgels using fluorescent probes
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DOI：
10.1016/j.polymer.2009.09.019
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发表时间：
2009-10-20
期刊：
影响因子：
4.6
通讯作者：
Kong, Hyunjoon
中科院分区：
文献类型：
--
作者：
Chu, Cathy;Schaefer, Brian W.;Kong, Hyunjoon
聚合物微凝胶的性能受聚合物内部交联结构的影响，但定量分析这种内部结构的工具有限。由于聚合物网络改变了芘的扩散性和随后的准分子形成，本研究使用芘准分子与单体发射的比率来确定聚乙二醇二丙烯酸酯(PEGDA)微凝胶中的交联数(N)和平均孔径(Xi)。制备了PEGDA水凝胶中Py的释放量与N和Xi之间的校正曲线，并用其计算了PEGDA微凝胶中的N和Xi。结果表明，与相同浓度的块状交联水凝胶相比，PEGDA微凝胶具有较高的交联密度和较小的平均孔径。这项研究中展示的分析方法可能有助于微调聚合物微凝胶的性能，适用于广泛的应用。(C)2009爱思唯尔有限公司。保留所有权利。
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 (xi) in poly(ethylene glycol) diacrylate (PEGDA) microgels. A calibration curve to relate pyrene emission to N and xi in PEGDA hydrogels was prepared and used to calculate N and xi 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. (C) 2009 Elsevier Ltd. All rights reserved.