Enhancing mechanical properties of polyvinyl alcohol films through cellulose nanocrystals derived from corncob

IF 3.5 4区工程技术 Q3 ENERGY & FUELS

Biomass Conversion and Biorefinery Pub Date : 2024-09-11 DOI:10.1007/s13399-024-06128-6

Getahun Esubalew Demewoz, Asnake Helia Tiruneh, Vincent Herald Wilson, Swaminathan Jose, Venkatesa Prabhu Sundramurthy

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Abstract

The present study aimed to investigate the influence of incorporating cellulose nanocrystals in a polyvinyl alcohol (PVA) matrix to achieve the enhanced mechanical properties. Cellulose nanocrystals (CNC) were extracted from waste corncob through sulfuric acid hydrolysis. The maximized yield of CNC (41.8%) was observed at the parameters, 65 mass %, 45 ℃, and 60 min for sulfuric acid concentration, reaction temperature, and hydrolysis time, respectively. FTIR showed that CNC had evidence with various functional groups. SEM morphology showed that the prepared CNC had needle-shaped and an average length of 170.3 nm. The crystallinity index characterized by XRD for CNCs (79.3%) was found to be higher than the extracted cellulose (76.4%). In addition, the thermal stability using TGA analysis showed that the degradation temperature of the CNC reached around 327 ℃, which was higher than that of the raw corncob and extracted corncob cellulose. Further, an investigation was performed on PVA/CNC nanocomposite films that were prepared by solution casting technique using different loadings of resultant CNC (2, 4, and 6 mass%) as nanofillers. By doing so, the tensile strength, elongation, and elastic modulus of polyvinyl alcohol films incorporated with CNC nanofillers were found to be improved significantly.

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通过提取自玉米芯的纤维素纳米晶体提高聚乙烯醇薄膜的机械性能

本研究旨在探讨在聚乙烯醇（PVA）基质中加入纤维素纳米晶体对提高机械性能的影响。通过硫酸水解法从废弃玉米芯中提取纤维素纳米晶（CNC）。在硫酸浓度、反应温度和水解时间分别为 65 质量%、45 ℃ 和 60 分钟时，CNC 的产量最大（41.8%）。傅立叶变换红外光谱（FTIR）显示，氯化萘含有各种官能团。扫描电镜形态显示，制备的 CNC 呈针状，平均长度为 170.3 nm。XRD 表征的 CNC 结晶指数（79.3%）高于提取的纤维素（76.4%）。此外，使用 TGA 分析的热稳定性表明，氯化萘的降解温度达到 327 ℃ 左右，高于未加工的玉米芯纤维素和提取的玉米芯纤维素。此外，还对采用溶液浇铸技术制备的 PVA/CNC 纳米复合薄膜进行了研究，该薄膜使用了不同含量的 CNC（2、4 和 6 质量%）作为纳米填料。结果发现，加入 CNC 纳米填料的聚乙烯醇薄膜的拉伸强度、伸长率和弹性模量都有显著提高。

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.