Thermal properties enhancement of poly(lactic acid) by corn cob cellulose nanocrystals

Q2 Materials Science

Polymers from Renewable Resources Pub Date : 2019-11-01 DOI:10.1177/2041247920952636

Wei Keat Ng, W. Chow, H. Ismail

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引用次数: 11

Abstract

Cellulose nanocrystals were extracted from agricultural waste corn cob using acid hydrolysis followed by freeze drying. Poly(lactic acid)/corn cob cellulose nanocrystals (PLA/CCNC) composites were prepared using solvent casting. The properties of CCNC were characterized using transmission electron microscope (TEM), zeta potential analyzer, and thermogravimetric analyzer (TGA). The effects of CCNC on the thermal properties of PLA were examined using differential scanning calorimetry (DSC) and TGA. From the SEM and TEM results, the irregular shaped and micron-sized corn cob powder was transformed to needle-like shaped nanocellulose (aspect ratio approximately 30.80) after the acid hydrolysis process. TGA results show that the thermal stability of CCNC is higher than that of corn cob powder. The zeta potential of CCNC is −24.6 mV, which indicates there is a repulsion force between the individual CCNC and making them disperse uniformly and stable in aqueous media. DSC and TGA results show that the crystallinity and thermal stability of PLA were increased by the incorporation of CCNC. This demonstrates that the CCNC is a potential bio-nanofiller with good thermal stability and nucleating-ability for PLA.

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玉米棒-纤维素纳米晶增强聚乳酸的热性能

采用酸水解和冷冻干燥的方法从农业废弃玉米芯中提取纤维素纳米晶体。采用溶剂浇铸法制备了聚乳酸/玉米芯纤维素纳米晶（PLA/CCNC）复合材料。利用透射电子显微镜（TEM）、ζ电位分析仪和热重分析仪（TGA）对CCNC的性能进行了表征。采用差示扫描量热法（DSC）和热重分析法（TGA）研究了CCNC对PLA热性能的影响。根据SEM和TEM结果，在酸水解过程后，不规则形状和微米大小的玉米芯粉末转变为针状纳米纤维素（纵横比约为30.80）。TGA结果表明，CCNC的热稳定性高于玉米芯粉。CCNC的ζ电位为−24.6 mV，这表明单个CCNC之间存在排斥力，使它们在水性介质中均匀稳定地分散。DSC和TGA结果表明，CCNC的加入提高了PLA的结晶度和热稳定性。这表明CCNC是一种潜在的生物纳米填料，具有良好的热稳定性和聚乳酸成核能力。

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来源期刊

Polymers from Renewable Resources Materials Science-Polymers and Plastics

CiteScore

3.50

自引率

0.00%

发文量

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.