Synthesis and characterisation of chemically crosslinked N-vinyl pyrrolidinone (NVP) based hydrogels
Synthesis and characterisation of chemically crosslinked N-vinyl pyrrolidinone (NVP) based hydrogels
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DOI：
10.1016/j.eurpolymj.2004.12.022
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发表时间：
2005-06-01
影响因子：
6
通讯作者：
Higginbotham, CL
中科院分区：
文献类型：
--
作者：
Devine, DM;Higginbotham, CL
由NVP、AA和乙二醇二甲基丙烯酸酯的混合物制备了聚乙烯吡咯烷酮-聚丙烯酸（PVP-PAA）交联复合物。聚乙烯吡咯烷酮-聚丙烯酸共聚物复合物的红外光谱表明氢键和非氢键的PVP。PVP-PAA复合物在较高pH介质中的溶胀与在低pH溶液中的结果显著不同。在共聚物的临界pH值以上，AA的羧酸基团被取代。因此，分子间键合减少，因此水凝胶倾向于溶胀至更大程度，从而产生更高的“水含量”和“吸水率”值。流变仪结果表明，由于吸水量增加，在不同pH下的凝胶强度存在显著差异。还发现，通过改变交联剂的分子量，可以实现相对凝胶强度的增加。© 2005爱思唯尔有限公司版权所有。
Crosslinked complexes of polyvinyl pyrrolidinone-polyacrylic acid (PVP-PAA) were prepared from a mixture of NVP, AA and ethyleneglycol dimethacrylates. The FTIR spectra of PVP-PAA copolymer complexes indicates both hydrogen bonded and non-hydrogen bonded PVP. Swelling of the PVP-PAA complex in a higher pH medium is significantly different from results in low pH solutions. Above the critical pH of the copolymer the carboxylic acid group of AA ionize. Therefore there is a reduction in the intermolecular bonding and so the hydrogels tend to swell to a greater degree yielding higher 'water content' and 'water uptake' values. The rheometry results indicated that there was a significant difference in the comparative gel strength at different pHs due to the increased water uptake. It was also found that by varying the molecular weight of the crosslinking agent an increase in comparative gel strength could be achieved. © 2005 Elsevier Ltd. All rights reserved.