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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Characterization of pH-Sensitive Hydrogels Based on Chitosan and D,L-Lactic Acid
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Synthesis and Characterization 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敏感水凝胶的合成与表征

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摘要

Novel pH-sensitive physically crosslinked hydrogels were synthesized by grafting D,L-lactic acid (LA) onto the amino groups in chitosan (CS) without a catalyst.The structures of these graft copolymers were analyzed by FTIR and X-ray measurements.Degree of substitution,side-chain length,and yield of copolymers were evaluated from ~1H-NMR,salicylaldehyde,and elemental analysis.The crystallinity of chitosan gradually decreased after grafting,since the side chains substitute the -NH_2 groups of chitosan randomly along the chain and destroy the regularity of packing between chitosan chains.Water uptake of the hydrogels was investigated as a function of side-chain length and degree of substitution.The influence of pH and salt concentration on the swelling behavior of the hydrogels was determined and interpreted.
机译：在没有催化剂的情况下，将D，L-乳酸（LA）接枝到壳聚糖（CS）的氨基上，合成了新型的pH敏感的物理交联水凝胶，并通过FTIR和X射线测量分析了这些接枝共聚物的结构。通过〜1H-NMR，水杨醛和元素分析评估共聚物的取代度，侧链长度和收率。接枝后壳聚糖的结晶度逐渐降低，因为侧链沿链随机取代了壳聚糖的-NH_2基团研究了水凝胶的吸水率与侧链长度和取代度的关系。确定并解释了pH和盐浓度对水凝胶溶胀行为的影响。

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