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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of novel poly(acrylamide-co-acrylic acid-co-2-hydroxy ethyl actylate) hydrogels: Mathematical approach in investigation of swelling kinetics and diffusion models
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Synthesis and characterization of novel poly(acrylamide-co-acrylic acid-co-2-hydroxy ethyl actylate) hydrogels: Mathematical approach in investigation of swelling kinetics and diffusion models

机译：新型聚（丙烯酰胺-丙烯酸-丙烯酸-羟基-2-羟乙基酯）水凝胶的合成与表征：研究溶胀动力学和扩散模型的数学方法

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摘要

In this study, a series of poly(acrylamide-co-acrylic acid-co-2-hydroxy ethyl actylate) [AM-co-AA-co-HEA] hydrogels have been synthesized by varying the acrylic acid (AA)content over eightfold in feed in the range of 33.34-93.76% by keeping other monomer constant. These hydrogels were characterized by FTIR, SEM analysis, elemental analysis, residual acrylic acid analysis, network parameters, and dynamic swelling behavior. The swelling study showed that equilibrium swelling ratio was nonlinearly increased with increasing AA content. Interestingly, the equilibrium swelling ratio decreased from 53.42 to 48.52 for 75-80% AA content hydrogel. The swelling data were found to satisfactorily fit Fick's second law, demonstrating that diffusion rate of water uptake was primarily Fickian. From model fitting, it was observed that early model was applicable for first 30% water absorption, and late model was applicable for latter 70% water absorption for increasing AA content from 33.34-90.90%. For 93.76% AA, early-time model was extended up to first 50% of water absorption and late model was contracted for latter 50% water absorption, indicating that excessive AA content affects the applicability range of early-time and late-time diffusion models for water absorption. Etters model was best applicable to all type of hydrogels and followed over all swelling range.
机译：在这项研究中，通过将丙烯酸（AA）含量改变八倍，合成了一系列聚（丙烯酰胺-丙烯酸-丙烯酸-羟基-2-羟乙基酯）[AM-co-AA-co-HEA]水凝胶。通过保持其他单体恒定，饲料中的添加量为33.34-93.76％。这些水凝胶的特征在于FTIR，SEM分析，元素分析，残留丙烯酸分析，网络参数和动态溶胀行为。溶胀研究表明，平衡溶胀率随AA含量的增加而非线性增加。有趣的是，对于AA含量为75-80％的水凝胶，平衡溶胀率从53.42降低至48.52。发现溶胀数据令人满意地符合菲克第二定律，表明吸水扩散速率主要是菲克安。从模型拟合中可以看出，早期模型适用于前30％的吸水率，晚期模型适用于后70％的吸水率，从而将AA含量从33.34-90.90％提高。对于93.76％的AA，早期模型扩展到前50％的吸水率，后期模型收缩到后50％的吸水率，表明过量的AA含量会影响早期和后期扩散模型的适用范围用于吸水。 Etters模型最适用于所有类型的水凝胶，并且在所有溶胀范围内均适用。

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