Morphology and barrier properties of nanobiocomposites of poly(3‐hydroxybutyrate) and layered silicates
Morphology and barrier properties of nanobiocomposites of poly(3‐hydroxybutyrate) and layered silicates
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DOI：
10.1002/app.27622
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发表时间：
2008-06
影响因子：
3
通讯作者：
M. Sánchez-García;E. Giménez;J. Lagarón
中科院分区：
文献类型：
--
作者：
M. Sánchez-García;E. Giménez;J. Lagarón
聚羟基丁酸酯（Polyhydroxybutyrate，简称PHB）是一种非常难处理的生物高分子材料，其在熔融加工过程中具有很大的不稳定性和脆性。本工作研究了形态，热，和阻隔性能的新型熔融混合nanobiocomposites的聚羟基丁酸酯，聚（ε-己内酯）（PCL），层状硅酸盐的基础上商业有机改性高岭土和蒙脱石粘土添加剂。将PCL组分添加到共混物中被认为降低了氧气渗透性，但也发现导致粘土的更细分散。添加高度intergallery溶胀的有机改性的蒙脱土的聚羟基丁酸酯共混物导致高度分散的形态的填料，但这同时增加到一个显着程度的生物聚合物的熔体不稳定性。然而，有机改性的高岭石粘土，尽管事实上发现其导致较少分散和不规则的形态，特别是对于较高的粘土负载，其导致对氧、D-柠檬烯和水的增强的阻隔性能。然而，D-柠檬烯，特别是水分子，被发现吸附在疏水和亲水的网站的填料，分别，从而减少了积极的屏障效应的扩大曲折因子的渗透性。传质性能被发现依赖于渗透剂的类型和建模的渗透率数据最常用的formalisms没有被发现是令人满意的，因为如形态的改变，在粘土分散体的异质性，和渗透剂在填料中的溶解度的因素。© 2008 Wiley Periodicals，Inc.应用聚合物科学杂志，2008年
Polyhydroxybutyrate (PHB) is generally considered to be a very uneasy biopolymer to handle because of significant instability during melt processing and some excessive brittleness. This work studied the morphological, thermal, and barrier properties of novel melt-mixed nanobiocomposites of PHB, poly(e-caprolactones) (PCL), and layered phyllosilicates based on commercial organomodified kaolinite and montmorillonite clay additives. The addition of PCL component to the blend was seen to reduce oxygen permeability but it was also found to lead to a finer dispersion of the clay. The addition of highly intergallery swollen organomodified montmorillonite clays to the PHB blend led to a highly dispersed morphology of the filler, but this simultaneously increased to a significant extend the melt instability of the biopolymer. Nevertheless, the organomodified kaolinite clay, despite the fact that it was found to both lead to less dispersed and irregular morphology, particularly for higher clay loadings, it led to enhanced barrier properties to oxygen, D-limonene, and water. D-limonene and specially water molecules were, however, found to sorb in both hydrophobic and hydrophilic sites of the filler, respectively, hence diminishing the positive barrier effect of an enlarged tortuosity factor in the permeability. Mass transport properties were found to depend on the type of penetrant and modeling of the permeability data to most commonly applied formalisms was not found to be satisfactory because of factors such as morphological alterations, heterogeneity in the clay dispersion, and penetrant solubility in the filler. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008