Laboratoire de Chimie des Matériaux Inorganiques (LCMI), UFR SSMT, Université Félix Houphouët-Boigny-Cocody, 22 BP 582 Abidjan 22, Cote d'Ivoire.
Unité de formation de recherche sciences biologiques, Université Peleforo Gon Coulibaly de Korhogo, BP 1328 Korhogo, Cote d'Ivoire.
Carbohydr Polym. 2021 Feb 15;254:117322. doi: 10.1016/j.carbpol.2020.117322. Epub 2020 Nov 2.
In this study, hydric and biodegradability properties of cassava starch-based bioplastics reinforced with crude kaolin or treated kaolinitic clay at 700 °C called metakaolin were investigated using water adsorption and microbiological tests. Non-reinforced bioplastics (BP) and those containing 5 wt.% crude kaolin (BPKB) or metakaolin (BPMKB) were manufactured using the casting/evaporation method. Results obtained showed a decrease in the solubility and in the water diffusion and permeability of clay-reinforced bioplastics with respect to the ones without reinforcement. This improvement of the hydric properties has been attributed to the reduction in the free volumes existing between the starch macromolecules due to their interactions with clay platelets. These interactions might favor a more homogeneous and compact microstructure. The biodegradability of the clay reinforced bioplastics was significantly improved due to the bacterial proliferation. The thermal treatment of kaolinitic clay further improved the hydric and biodegradability properties of starch-based bioplastics.
本研究采用水吸附和微生物测试的方法，考察了用 700℃条件下制备的高岭土或称为偏高岭土的处理高岭土对木薯淀粉基生物塑料的增强作用对其水和生物降解性能的影响。采用浇铸/蒸发法制备了未增强的生物塑料（BP）以及分别添加 5wt.% 天然高岭土（BPKB）和偏高岭土（BPMKB）的生物塑料。结果表明，与未增强的生物塑料相比，粘土增强的生物塑料的溶解度、水扩散和渗透性降低。这种水性能的改善归因于粘土片层与淀粉大分子相互作用导致淀粉大分子之间的自由体积减少。这种相互作用可能有利于形成更均匀和更致密的微观结构。由于细菌的增殖，粘土增强生物塑料的生物降解性显著提高。高岭土的热处理进一步提高了基于淀粉的生物塑料的水和生物降解性能。
