A study on mechanical, structural, morphological, and thermal properties of raw and alkali treated Cordia dichotoma‐polyester composite,Polymer Composites

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A study on mechanical, structural, morphological, and thermal properties of raw and alkali treated Cordia dichotoma‐polyester composite
Polymer Composites ( IF 4.8 ) Pub Date : 2020-09-28 , DOI: 10.1002/pc.25826
Bandi Madhusudhan Reddy ₁ , Yerasu Venkata Mohana Reddy ₁ , B. Chandra Mohan Reddy ₂ , Gudimetta Suresh Kumar ₁ , P. Venkateshwar Reddy ₁ , H. Raghavendra Rao ₁

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Currently, natural fibers used as reinforcement with polymer composite materials is trending among many researchers, due to their significant properties like low density, light weight and biodegradability. One of such fibers is Cordia dichotoma, which are cheap and available in abundance. The Cordia dichotoma ffibers were extracted from its bark using water‐retting process. These unidirectional fibers were reinforced in a polyester matrix, and mechanical properties such as tensile and flexural properties of the resulting composite were determined experimentally. The Cordia dichotoma fibers were alkali treated with 5% NaOH solution to enhance bonding with matrix and the effect of this treatment on properties of the composite were explored. It was observed that 5% NaOH treatment gives considerable improvement in mechanical properties of the composite. FTIR spectroscopy was used to identify the functional groups and chemical compositions of the raw and alkali treated fiber composites. SEM analysis was carried out and resulting images revealed the existence of impurities on the surface of the raw fiber in the composite. Removal of the impurities with alkali treatment of fibers made the surface of the fibers rough and lead to improving the mechanical properties. Further, thermal stability (degradation temperature and weight loss) of raw and alkali treated fiber reinforced composites was studied using TGA.

中文翻译：

生和碱处理的Cordia dihotoma-聚酯复合材料的力学，结构，形态和热性能的研究

目前，由于高分子纤维的低密度，轻质和可生物降解性等显着特性，天然纤维被用作聚合物复合材料的补强材料。这样的纤维之一是二丁香（Cordia dichotoma），其便宜并且有大量供应。的破布子ffibers使用水脱胶过程从它的树皮中提取。这些单向纤维在聚酯基体中得到增强，并通过实验确定了所得复合材料的机械性能，例如拉伸性能和弯曲性能。该破布子用5％NaOH溶液对纤维进行碱处理，以增强与基体的结合力，并探讨了该处理对复合材料性能的影响。观察到5％的NaOH处理使复合材料的机械性能有了相当大的改善。FTIR光谱用于鉴定未处理和碱处理的纤维复合材料的官能团和化学组成。进行了SEM分析，所得图像显示出复合物中的原纤维表面上存在杂质。用纤维碱处理除去杂质使纤维表面粗糙并导致改善机械性能。此外，使用TGA研究了原始和碱处理的纤维增强复合材料的热稳定性（降解温度和重量损失）。

更新日期：2020-09-28

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