农业原料弱酸水解法制备淀粉纳米晶体的工艺优化与表征

Q2 Materials Science
J. Saeng-On, D. Aht-Ong
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引用次数: 19

摘要

由于化石燃料的不足和环境污染,可持续高效的材料利用已成为最重要的问题。这项工作旨在通过高效生产,从可再生资源中生产用于生物基材料的纳米填料。采用温和酸水解法制备了香蕉和木薯淀粉纳米晶体。研究了酸类型、酸浓度、反应时间和温度对产率和结晶度的影响,以寻找制备SNCs的合适条件。分别通过傅立叶变换红外光谱(FT-IR)、X射线粉末衍射(XRD)和透射电子显微镜(TEM)检查了所获得的SNCs的化学结构、结晶度和形态。采用热重分析(TGA)和差示扫描量热法(DSC)对其热性能进行了表征。结果表明,根据淀粉类型的不同,制备SNCs的合适条件是在40°C下使用3.5M H2SO4 7小时或10小时,这导致香蕉和木薯SNCs的结晶度分别为47.13%和60.06%。两种SNC的粒径均小于200 nm,约为30–70 nm。香蕉SNC显示出具有C型结晶度的平行六面体纳米片,而木薯SNC则显示出具有A型结晶性的球形纳米片。香蕉和木薯SNC的降解温度在280至310°C之间,由于酸水解反应中SNC分子链的分解,其降解温度低于其天然淀粉。然而,水解后SNC填料的熔融焓(ΔH)增加,表明由于淀粉分子的链重排,结晶度增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Production of Starch Nanocrystals from Agricultural Materials Using Mild Acid Hydrolysis Method: Optimization and Characterization
Due to an insufficiency of fossil fuels and environmental pollution, sustainable and efficient material utilization has become the greatest importance. This work aimed to produce nanosized filler for biobased materials from renewable resource by an efficient production. Banana and tapioca starch nanocrystals (SNCs) were prepared from mild acid hydrolysis method. The effects of acid type, acid concentration, reaction time, and temperature on percent yield and degree of crystallinity were investigated in order to find the suitable condition for SNCs preparation. The chemical structure, degree of crystallinity, and morphology of the obtained SNCs were examined by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and transmission electron microscopy (TEM), respectively. Thermal properties were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results revealed that the suitable conditions for preparing SNCs were by using 3.5 M H2SO4 at 40°C for 7 hrs or 10 hrs depending on starch type, which leading to high degree of crystallinity as 47.13% and 60.06% for banana and tapioca SNCs, respectively. The particle size of both SNCs was less than 200 nm, approximately 30–70 nm. The banana SNC displayed parallelepiped nanoplatelets with C-type crystallinity, while the tapioca SNC showed spherical nanoplatelets with A-type crystallinity. The degradation temperature of banana and tapioca SNCs occurred in ranging between 280 and 310°C, which was lower than their native starches due to the disintegration of the SNC molecular chain during acid hydrolysis reaction. Nevertheless, melting enthalpy (ΔH) of SNC fillers enhanced after hydrolysis indicating that there was an increment of degree of crystallinity owing to the chain rearrangement of starch molecules.
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来源期刊
Polymers from Renewable Resources
Polymers from Renewable Resources Materials Science-Polymers and Plastics
CiteScore
3.50
自引率
0.00%
发文量
15
期刊介绍: Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.
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