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首页> 外文期刊>Journal of Applied Polymer Science >Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites
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Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

机译：小麦秸秆颗粒中水蒸气的吸附和扩散及其对生物复合材料传质性能的影响

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This work intends to decipher the role of hydrophilic fillers, wheat straw fibers (WSF), on the water vapor transfer properties (sorption and diffusion) of biocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate), (PHBV) as matrix. Transfer in biocomposites, measured using dynamical vapor sorption measurement, is correlated to the transfer properties of each individual constituent and to the specific structural arrangements induced by the presence of particles inside the matrix. Increasing amounts of WSF particles in the PHBV matrix lead to an increase of the water vapor sorption (WVS) of the resulting composites. This is attributed to the high sorption of hydrophilic WSF as compared to that of the neat PHBV matrix. Water vapor diffusion in composites (around 0.13 x 10(-11) m(2) s(-1) at 20 degrees C whatever the filler content) is always lower than in the neat matrix (0.26 x 10(-11) m(2) s(-1)) although wheat straw displays high diffusivity values (1.84 x 10(-11) m(2) s(-1)). Such unexpected behavior is related to (1) changes of structure and properties of the WSF particle once embedded in the PHBV matrix, (2) changes in the polymer matrix structure and properties in contact with fibers, and also (3) to the representativeness of the filler diffusivity, which is difficult to appraise. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43329.
机译：这项工作旨在解释亲水性填充剂麦草纤维（WSF）在基于聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）的生物复合材料的水蒸气转移特性（吸收和扩散）上的作用。矩阵。使用动态蒸气吸附测量法测量的生物复合物中的转移与每个单独成分的转移特性以及基质内部存在的颗粒引起的特定结构安排相关。 PHBV基质中WSF颗粒数量的增加会导致所得复合材料的水蒸气吸附（WVS）增加。与纯净PHBV基质相比，这归因于亲水性WSF的高吸附性。复合材料中的水蒸气扩散（无论填料含量如何，在20摄氏度下约为0.13 x 10（-11）m（2）s（-1））始终低于纯净基质中的水蒸气扩散（0.26 x 10（-11）m（ 2）s（-1）），尽管小麦秸秆显示出高扩散率值（1.84 x 10（-11）m（2）s（-1））。这种意外行为与（1）一旦嵌入PHBV基质中的WSF颗粒的结构和性质发生变化，（2）与纤维接触的聚合物基质结构和性质发生变化以及（3）纤维的代表性有关填料扩散率，很难评估。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43329。

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