Pectin and polyacrylamide composite hydrogels: Effect of pectin on structural and dynamic mechanical properties
Pectin and polyacrylamide composite hydrogels: Effect of pectin on structural and dynamic mechanical properties
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DOI：
10.1002/app.20174
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发表时间：
2004-05-05
影响因子：
3
通讯作者：
Hicks, KB
中科院分区：
文献类型：
--
作者：
Liu, LS;Cooke, PH;Hicks, KB
合成了果胶和聚丙烯酰胺的复合水凝胶，并通过扫描电镜、原子力显微镜、光镜和动态力学分析对其进行了评价。丙烯酰胺在果胶溶液中的交联聚合得到了具有大孔果胶结构域和间隙型聚丙烯酰胺结构域的复合材料。这种复合材料与单独使用的任何一种聚合物相比，具有更好的机械性能，并且比单独使用交联聚丙烯酰胺吸收和保留了更多的水。此外，在现有的果胶支架中，丙烯酰胺的交联聚合导致双网络结构，其中丝状聚丙烯酰胺网络穿透果胶支架的孔隙。结果表明，果胶通过调节两组分的相分离配合和水在两相间的分配来决定复合材料的微观结构特征。这项研究的结果强调了果胶在保护环境敏感聚合物的物理结构免受冷冻、冻干和其他在生物医学和工业产品中使用过程中经历的机械损伤方面的潜在新用途。(C) 2004 Wiley期刊有限公司
Composite hydrogels of pectin and polyacrylamide were synthesized and evaluated by scanning electron microscopy, atomic force microscopy, light microscopy, and dynamic mechanical analysis. The crosslinking polymerization of acrylamide in pectin solution resulted in a composite having a macroporous pectin domain with an interstitial polyacrylamide domain. This composite had improved mechanical properties compared to those of either polymer alone, and it absorbed and retained more water than crosslinked polyacrylamide alone. Furthermore, crosslinking polymerization of acrylamide in an existing pectinate scaffold resulted in a double-network architecture, where filamentous polyacrylamide networks penetrated through pores of the pectin scaffold. It was found that pectins dictated the features of microstructure in the composites through regulating the coordination of phase separation of the two components and water partition between the two phases. Results from this study highlight potential new uses of pectins in protecting the physical structure of environmentally sensitive polymers from mechanical damage related to freezing, lyophilization, and other conditions experienced during their use in biomedical and industrial products. (C) 2004 Wiley Periodicals, Inc.