木薯淀粉薄膜中含有乙酰化淀粉纳米颗粒作为增强材料：物理和机械特性的研究。
Cassava starch films containing acetylated starch nanoparticles as reinforcement: Physical and mechanical characterization.
机构信息
Departamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina, Cx. Postal 6001, CEP 86051-990 Londrina, PR, Brazil.
Departamento de Bioquímica e Biotecnologia, Centro de Ciências Exatas, Universidade Estadual de Londrina, Cx. Postal 6001, CEP 86051-990 Londrina, PR, Brazil.
出版信息
Carbohydr Polym. 2015 Aug 1;126:9-16. doi: 10.1016/j.carbpol.2015.03.021. Epub 2015 Mar 20.
This paper reports the use of acetylated starch nanoparticles (NPAac) as reinforcement in thermoplastic starch films. NPAac with an average size of approximately 500 nm were obtained by nanoprecipitation. Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) indicated that NPAac are more thermally stable and essentially amorphous when compared with acetylated starch. Thermoplastic starch films with different proportions of NPAac (0.5, 1.0, 1.5, 10.0%, w/w) were obtained and characterized by scanning electron microscopy (SEM), water vapor permeability (WVP), adsorption isotherms, TGA and mechanical tests. The inclusion of reinforcement caused changes in film properties: WVP was lowered by 41% for film with 1.5% (w/w) of NPAac and moisture adsorption by 33% for film with 10% (w/w) of NPAac; and the Young's modulus and thermal stability were increased by 162% and 15%, respectively, for film with 0.5% (w/w) of NPAac compared to the starch film without the addition of NPAac.
本文报告了乙酰化淀粉纳米颗粒（NPAac）在热塑性淀粉薄膜中的增强作用。通过纳米沉淀法获得平均粒径约为 500nm 的 NPAac。傅里叶变换红外（FTIR）和热重分析（TGA）表明，与乙酰化淀粉相比，NPAac 的热稳定性更高，基本为非晶态。通过扫描电子显微镜（SEM）、水蒸气透过率（WVP）、吸附等温线、TGA 和力学测试，得到了不同比例（0.5、1.0、1.5、10.0%，w/w）NPAac 的热塑性淀粉薄膜，并对其进行了表征。增强剂的加入引起了薄膜性能的变化：添加 1.5%（w/w）NPAac 的薄膜的 WVP 降低了 41%，添加 10%（w/w）NPAac 的薄膜的水分吸附降低了 33%；与未添加 NPAac 的淀粉薄膜相比，添加 0.5%（w/w）NPAac 的薄膜的杨氏模量和热稳定性分别提高了 162%和 15%。
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