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首页> 外文期刊>Journal of Applied Polymer Science >The water vapor sorption behavior of a galactomannan cellulose nanocomposite film analyzed using parallel exponential kinetics and the Kelvin-Voigt viscoelastic model
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The water vapor sorption behavior of a galactomannan cellulose nanocomposite film analyzed using parallel exponential kinetics and the Kelvin-Voigt viscoelastic model

机译：半乳甘露聚糖纤维素纳米复合薄膜的水蒸气吸附行为，采用平行指数动力学和Kelvin-Voigt粘弹性模型分析

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摘要

Nanocomposite films have been developed where a galactomannan (guar) matrix was reinforced with cellulose nanowhiskers and plasticized using sorbitol. The properties of these films were compared with films made from guar only. The films were examined using scanning electron microscopy and dynamic vapor sorption. The sorption kinetics properties were analyzed using parallel exponential kinetics (PEK) and this data interpreted using the Kelvin-Voigt (K-V) viscoelastic model. Substantial differences in sorption behavior were noted between the guar and cellulose reinforced guar films. Addition of cellulose nanowhiskers (CNWs) to the guar resulted in a change in the shape of the isotherm, as well as a reduced equilibrium moisture content throughout the hygroscopic range. With the guar film, hysteresis between the adsorption and desorption branches of the isotherm occurred up to 75% RH, where it collapsed. Dynamic mechanical analysis showed that the collapse of the hysteresis loop occurred at the glass transition temperature of the guar film. However, addition of CNWs to the guar produced a film where sorption hysteresis was found to occur throughout the hygroscopic range. The applicability of the K-V interpretation of the sorption kinetics is discussed.
机译：已开发出纳米复合薄膜，其中半乳甘露聚糖（瓜尔胶）基质用纤维素纳米晶须增强，并使用山梨糖醇增塑。将这些薄膜的性能与仅由瓜尔胶制成的薄膜进行了比较。使用扫描电子显微镜和动态蒸气吸附检查膜。使用平行指数动力学（PEK）分析吸附动力学性质，并使用开尔文-沃格特（K-V）粘弹性模型解释该数据。注意到瓜尔胶和纤维素增强瓜尔胶膜在吸附行为上有很大差异。瓜尔胶中添加纤维素纳米晶须（CNW）导致等温线形状的变化，以及整个吸湿范围内平衡水分含量的降低。使用瓜尔胶膜时，等温线的吸附和解吸分支之间的滞后现象在高达75％RH的条件下都会发生，并在那里塌陷。动态力学分析表明，磁滞回线的塌陷发生在瓜尔胶膜的玻璃化转变温度。但是，在瓜尔胶中添加CNW会产生薄膜，在整个吸湿范围内都会出现吸附滞后现象。讨论了吸附动力学的K-V解释的适用性。

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