Preparation and properties of a hydrogel of maleated poly(vinyl alcohol) (PVAM) grafted with cassava starch.
Preparation and properties of a hydrogel of maleated poly(vinyl alcohol) (PVAM) grafted with cassava starch.
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DOI：
10.1016/j.carbpol.2014.12.012
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发表时间：
2015-05
影响因子：
11.2
通讯作者：
S. Riyajan;Wattana Sukhlaaied;Woranut Keawmang
中科院分区：
文献类型：
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作者：
S. Riyajan;Wattana Sukhlaaied;Woranut Keawmang
以马来酸酐化聚乙烯醇（PVAM）和木薯淀粉（CSt）为原料，过硫酸钾为热引发剂，通过接枝反应合成了一种pH敏感性接枝共聚物（PVAM-g-CSt）。通过FTIR揭示了PVAM-g-CSt的化学结构，并且在1089 cm−1处观察到接枝共聚物的醚键。发现共聚物的接枝度在40和82%之间，取决于PVAM/CSt比率。发现在9：1的PVAM/CSt比率下的拉伸强度最高。此外，在水中的溶胀比增加的CSt在PVAM-g-CSt的比例增加，由于在接枝度的下降。所得水凝胶在不同pH介质中表现出良好的pH敏感性。接枝共聚物在自然土壤中易降解，特别是在CSt比例较高时。
A novel pH-sensitive graft copolymer (PVAM-g-CSt) was synthesized from maleated poly(vinyl alcohol) (PVAM) and cassava starch (CSt) through a grafting reaction using potassium persulfate as a thermal initiator. The chemical structure of the PVAM-g-CSt was revealed by FTIR and ether linkage of the graft copolymer was observed at 1089 cm−1. The degree of grafting of the copolymer was found to range between 40 and 82%, depending on the PVAM/CSt ratio. The highest tensile strength was found at a ratio of 9:1 PVAM/CSt. In addition, the swelling ratio in water increased with increasing proportions of CSt in the PVAM-g-CSt due to the decrease in the degree of grafting. The resulting hydrogel exhibits good pH sensitivity in different pH mediums. The graft copolymer easily degraded in natural soil, especially at high proportions of CSt in the blend.