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Preparation of bacterial cellulose based hydrogels and their viscoelastic behavior

机译:细菌纤维素基水凝胶的制备及其粘弹性行为

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摘要

Bacterial cellulose (BC) based hydrogels have been prepared in blended with carboxymethylcellulose and polyvinyl pyrrolidone by using heat treatment. The properties of BC-CMC and BC-PVP hydrogels were compared with pure BC, CMC and PVP hydrogels. These hydrogels were investigated by measuring their structural, morphological and viscoelastic properties. Through the morphological images, alignment of the porous flake like structures could be seen clearly within the inter-polymeric network of the hydrogels. Also, the detail structure analysis of the polymers blended during the hydrogel formation confirms their interactions with each other were studied. Further, the viscoelastic behavior of all the hydrogels in terms of elastic and viscous property was studied. It is observed that at 1% strain, including CMC and PVP hydrogels, all the BC based hydrogels exhibited the linear trend throughout. Also the elastic nature of the material remains high compared to viscous nature. Moreover, the changes could be noticed in case of blended polymer based hydrogels. The values of complex viscosity (eta*) decreases with increase in angular frequency within the range of omega = 0.1-100 rad.s(-1).
机译:已经通过热处理将基于细菌纤维素(BC)的水凝胶与羧甲基纤维素和聚乙烯吡咯烷酮共混来制备。将BC-CMC和BC-PVP水凝胶的性能与纯BC,CMC和PVP水凝胶进行了比较。这些水凝胶通过测量其结构,形态和粘弹性质进行了研究。通过形态学图像,可以在水凝胶的聚合物间网络中清楚地看到多孔薄片状结构的排列。同样,在水凝胶形成过程中共混的聚合物的详细结构分析也证实了它们之间的相互作用。此外,研究了所有水凝胶在弹性和粘性方面的粘弹性行为。观察到,在1%应变下,包括CMC和PVP水凝胶,所有基于BC的水凝胶始终呈现线性趋势。与粘性性质相比,材料的弹性性质也保持较高。而且,在基于聚合物的共混水凝胶的情况下可以注意到变化。在ω= 0.1-100 rad.s(-1)的范围内,复数粘度(eta *)的值随角频率的增加而减小。

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