Preparation and NMR characterization of superporous hydrogels (SPH) and SPH composites
Preparation and NMR characterization of superporous hydrogels (SPH) and SPH composites
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DOI：
10.1016/s0032-3861(00)00200-7
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发表时间：
2000-11-01
期刊：
影响因子：
4.6
通讯作者：
Junginger, HE
中科院分区：
文献类型：
--
作者：
Dorkoosh, FA;Brussee, J;Junginger, HE
本文研究了超孔水凝胶(SPH)及其复合材料的合成机理和表征。用固体碳-13核磁共振对聚合物的结构进行了表征。采用扫描电子显微镜(SEM)、表观密度和溶胀比等方法对聚合物进行了表征。结果表明，SPH聚合物是以N，N‘-亚甲基双丙烯酰胺为交联剂，以丙烯酰胺和丙烯酸单体为主链组成的聚合物。在合成的最后一步中加入的碳酸氢钠被用来生成二氧化碳，导致聚合物结构中大量相互连接的气孔。除了改变单体用量和使用Ac-Di-Sol作为稳定剂外，SPH复合聚合物的制备方法相同。Ac-Di-Sol的纤维与主链重叠，提高了聚合物的机械稳定性。通过扫描电子显微镜、表观密度测定和溶胀比研究表明，与SPH复合聚合物相比，SPH聚合物具有更多的气孔和更高的溶胀率，但机械稳定性较差。SPH复合聚合物的气孔较少，溶胀率较低，但机械稳定性较高。(C)2000爱思唯尔科学有限公司。保留所有权利。
In this investigation the mechanism of synthesis and characterization of Superporous Hydrogel (SPH) and SPH composites were studied. Solid-state C-13 NMR was used for elucidating the structure of the polymers. Scanning electron microscopy (SEM), apparent density and swelling ratio studies were used to characterize these polymers. The results showed the SPH polymer was made of the sequence of acrylamide and acrylic acid monomers as a backbone chain, which was cross-linked with N,N'-methylenebis acrylamide. Sodium bicarbonate added in the last step of the synthesis was used to generate CO2 formation, causing a large number of interconnecting pores within the polymer structure. SPH composite polymers were made in the same way, except for changing the amount of monomers and using Ac-Di-Sol as a stabilizer. The cellulosic fibres of Ac-Di-Sol will overlap the backbone chain, so the mechanical stability of these polymers will be increased. Characterization of the prepared polymers by SEM, measurement of the apparent density together with swelling ratio studies showed that SPH polymers have more pores and higher swelling ratio but less mechanical stability compared to SPH composite polymers, which have less pores and lower swelling ratio but a higher mechanical stability. (C) 2000 Elsevier Science Ltd. All rights reserved.