pH sensitive phosphate crosslinked films of starch‐carboxymethyl cellulose,Polymer Engineering and Science

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pH sensitive phosphate crosslinked films of starch‐carboxymethyl cellulose
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-02 , DOI: 10.1002/pen.25582
Caroline Cagnin ₁ , Bruno Matheus Simões ₁ , Fábio Yamashita ₁ , Gizilene Maria Carvalho ₂ , Maria Victória Eiras Grossmann ₁

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This work aims to develop hydrogel films of starch and carboxymethyl cellulose (CMC) crosslinked with sodium trimetaphosphate (STMP) and to characterize some of their properties. Starch and STMP (S/T), starch and CMC (S/C), and mixed (S/T/C) films were prepared by casting. The degree of substitution, morphology, swelling degree, FTIR, mechanical properties, and sorption isotherms were studied. Reticulated samples (S/T and S/T/C) showed the same degree of substitution (0.050 ± 0.001). All films presented homogeneous morphology, but the mixed film showed greater roughness. Crosslinking increased the swelling capacity of the mixed hydrogel at pH 7, although it remained decreased concerning the S/T hydrogel. However, this property was sensitive to pH variations. The mixed film (S/T/C) showed greater mechanical resistance. The casting process was efficient to produce hydrogel films of starch/CMC crosslinked with STMP and the general results demonstrated the advantages of the mixed hydrogel.

中文翻译：

淀粉-羧甲基纤维素的pH敏感磷酸盐交联膜

这项工作旨在开发与三偏磷酸钠（STMP）交联的淀粉和羧甲基纤维素（CMC）水凝胶膜，并表征其某些特性。通过流延制备淀粉和STMP（S / T），淀粉和CMC（S / C）以及混合（S / T / C）膜。研究了取代度，形态，溶胀度，FTIR，机械性能和吸附等温线。网状样品（S / T和S / T / C）显示出相同的取代度（0.050±0.001）。所有膜均呈现均匀的形态，但是混合膜显示出更大的粗糙度。交联增加了混合水凝胶在pH 7时的溶胀能力，尽管在S / T水凝胶方面仍保持下降的趋势。然而，该性质对pH变化敏感。混合膜（S / T / C）显示出更大的机械强度。流延工艺有效地制备了与STMP交联的淀粉/ CMC水凝胶膜，一般结果证明了混合水凝胶的优点。

更新日期：2020-11-02

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