首页> 外文期刊>Journal of Applied Polymer Science >Structural Change and Swelling Mechanism of pH-Sensitive Hydrogels Based on Chitosan and D,L-Lactic Acid
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Structural Change and Swelling Mechanism of pH-Sensitive Hydrogels Based on Chitosan and D,L-Lactic Acid

机译:基于壳聚糖和D,L-乳酸的pH敏感水凝胶的结构变化和溶胀机理

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摘要

Graft copolymerization of D,L-lactic acid (LA) onto chitosan (CS) was attempted without using a catalyst.pH-sensitive hydrogels were obtained which are based on two different components:a natural polymer and a synthetic polymer and a synthetic polymer.These polyester substituents provide the basis for hydrophobic interactions that contribute to the formation of hydrogels.The swelling mechanisms in enzyme-free simulated gastric fluid (SGF,pH 2.2) or simulated intestinal fluid (SIF,pH 7.4) at 37 deg C were investigated.Meanwhile,structural changes of the graft copolymers in the different pH buffers were studied by FTIR,and these are discussd together with the swelling mechanisms.The effect of pH on the water uptake of hydrogel was investigated by using McIlvaine buffer with the same ionic strength.The morphological change of hydrogels in different aqueous solutions is investigated by scanning electron microscopy (SEM).
机译:尝试在不使用催化剂的情况下将D,L-乳酸(LA)接枝到壳聚糖(CS)上。得到基于两种不同成分的pH敏感水凝胶:天然聚合物和合成聚合物以及合成聚合物。这些聚酯取代基为形成水凝胶的疏水相互作用提供了基础。研究了无酶模拟胃液(SGF,pH 2.2)或模拟肠液(SIF,pH 7.4)在37℃下的溶胀机理。同时,通过FTIR研究了不同pH缓冲液中接枝共聚物的结构变化,并探讨了其溶胀机理。采用离子强度相同的McIlvaine缓冲液研究了pH对水凝胶吸水率的影响。通过扫描电子显微镜(SEM)研究水凝胶在不同水溶液中的形态变化。

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