CHARACTERIZATION OF CHEMICAL-TREATED AND GAMMA IRRADIATED PINEAPPLE LEAF FABRIC/EPOXY COMPOSITES: SURFACE STRUCTURE AND PHYSICO-MECHANICAL PROPERTIES

The objective of this study is to investigate the effect of gamma irradiation and chemical (NaOH) treatment on the physicomechanical properties of the pineapple/epoxy composites. The manual lay-up process was used here in fabricating pineapple leaf fabric (PALF fabric) reinforced composites. A scanning electron microscope (SEM) has been exploited for understanding the outward structure of composites. FTIR and EDS analysis recognized the existence of silicon and Si–O–Si/C–O–Si cross-linked configurations on the outward structure of composites. From the experimental results, it was found that gamma irradiation subjected composite sample had significant improvement in mechanical properties in comparison with composites reinforced with chemical treated pineapple leaf fabric and untreated composite. Tensile strength (TS), tensile modulus (TM), bending strength (BS), bending modulus (BM) and impact strength (IS) of gamma irradiated composite increased by approximately 71.26 %, 461.29%, 72.45%, 24.52% and 40.44% respectively compared to untreated composites. Furthermore, Gamma irradiated composite exhibited an increase of 49.98% TS, 40.46% TM, 35.82% BS, 11.21% BM and 12.44% IS compared to chemical treated pineapple leaf fabric composites. The reason for the improved physico-mechanical properties of gamma irradiated sample is due to the formation of crosslink in fiber and matrix molecules. The water absorption behavior of the composites was also tested.

GAMA IŞINI VE KİMYASAL İŞLEM UYGULANMIŞ ANANAS LİFLERİNDEN ÜRETİLEN KUMAŞ/ EPOKSİ KOMPOZİTLERİN KARAKTERİZAYONU: YÜZEY YAPISI VE FİZİKO MEKANİK ÖZELLİKLERİ

Çalışmanın amacı, gama ışınları ve kimyasal (NaOH) işlemin ananas/ epoksi kompozitlerinin fiziko- mekanik özellikleri üzerine etkilerinin araştırılmasıdır. Ananas yapraklarından elde edilen lifler ile oluşturulan kumaşların takviye elemanı olarak kullanıldığı kompozitler, el ile yatırma tekniği kullanılarak üretilmiştir. Kompozitin dış yapısının anlaşılabilmesi için taramalı elektron mikroskobundan (SEM) faydalanılmıştır. Kompozitin dış yapısındaki silikonun mevcudiyeti ve Si–O–Si/C–O–Si çapraz bağlarının konfigürasyonu FTIR ve EDS analizleri ile tanımlanmıştır. Deneysel sonuçlar sayesinde, gama ışınları uygulanan kompozit numunelerinin mekanik özelliklerinin kimyasal işlem uygulanan ve uygulanmayan kumaşlar ile takviye edilmiş kompozit numunelerine göre önemli derecede iyileşme sağladığı belirlenmiştir. Gama ışınları uygulanan kompozitlerin kimyasal işlem uygulanmamış kompozitlere göre çekme dayanımı (ÇD), çekme modülü (ÇM), eğilme dayanımı (ED), eğilme modülü (EM) ve darbe dayanım (DD) değerleri yaklaşık olarak sırası ile %71,26, %461,29, %72,45, %24,52 ve %40,44 oranlarında artmıştır. Bu duruma ek olarak, gama ışınları uygulanan kompozitler kimyasal işlem uygulanmış kumaşların takviye elemanı olarak kullanıldığı kompozitlere göre %49,98 ÇD, %40,46 ÇM, %35,82 ED, %11,21 EM ve %12,44 DD oranlarında artış sağlamıştır. Gama ışınları uygulanın numunenin fiziko- mekanik özelliklerinin iyileşmesinin sebebi matris ve lif molekülleri arasında çapraz bağların oluşmasıdır. Ayrıca kompozitlerin su absorbsiyon davranışları test edilmiştir.

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