Sol-Jel Silika Kaplanmış Kumaşların Isıl ve Mekanik Özellikleri

Year 2021, Issue: 31, 309 - 319, 31.12.2021

Abdullah TAV Yahya ÖZ Halil İbrahim AKYILDIZ

https://doi.org/10.31590/ejosat.1000774

Cited By: 1

Abstract

Sol-jel yöntemi çok çeşitli malzemelerin üretilebildiği, çok kullanışlı bir malzeme sentez yöntemidir. Bu yöntem, malzeme yüzeylerinin modifikasyonu içinde kullanılabilmektedir. Görece ucuz ve esnek yapıda olan tekstil malzemeleri, yüksek teknoloji kompozit uygulamaları için de kullanılmaktadır. Bu çalışmada, tetraetil ortosilikatın hidrolizi ile hazırlanan silika sol süspansiyonları, pamuk, poliamid 6.6 (PA 6.6) ve polietilen tereftalat (PET) kumaşlarını kaplamak için kullanılmış olup termal ve mekanik özelliklerine olan etkisi incelenmektedir. Silika sol süspansiyonu içerisine herhangi ilave bir katkı kullanılmadan ve bağlayıcı olarak poli(vinil alkol) (PVA) kullanılarak kumaşların kaplaması gerçekleştirilmiştir. Malzemelerin morfolojileri kaplama işleminden önce ve sonra SEM ile analiz edilmiş olup kaplamaların kumaş yüzeylerinde düzgün dağıldığı teyit edilmiştir. Fonksiyonel gruplardaki değişiklikleri gözlemlemek için numunelerin FTIR spektrumu ile kaplanmış malzemelerin kimyasal yapıları karşılaştırılmıştır. Numunelerin FTIR spektrumları kaplama sonrasında polimer piklerinin kaplama sonrası azaldığını ve bazı numunelerde Si-O bağlanma durumlarını göstermiştir. Silika kaplanmış kumaş numunelerinin termal bozunması üzerindeki etkisi, termogravimetrik analiz (TGA) kullanılarak incelenmektedir. Kaplama sonrasında polimerlerin ısıl bozunma davranışlarının büyük ölçüde aynı kaldığı ancak kalıntı miktarlarında kaplama türüne göre farklılıklar gösterdiği gözlemlenmiştir. Kaplamaların mekanik performansı, büyük ölçüde kumaş malzemesine bağlı olduğu, çekme testi ile tespit edilmiştir. Çekme testleri sonucu kaplamalı kumaşların mekanik performansının büyük ölçüde kumaş hammaddesine bağlı olduğunu göstermiştir.

Keywords

Sol-jel, Silika, Kaplama, Pamuk, Poliamid 6.6, Polietilen tereftalat

Thermal and Mechanical Properties of Sol-Gel Silica Coated Fabrics

Abstract

Sol-gel method is a versatile materials synthesis method via which numerous materials can be produced in various forms. The method also can be utilized for the modification of materials surfaces. Textile substrates being relatively inexpensive and flexible, can be used in composite structures for high technology applications. In this study, silica sol suspensions prepared via hydrolysis of tetraethyl orthosilicate were used to coat cotton, polyamide 6.6 (PA 6.6), and polyethylene terephthalate (PET) fabrics and to alter their thermal and mechanical properties. The coating process was conducted by applying the silica sol suspension to the fabric without any other additive and with poly(vinyl alcohol) (PVA) employed as a binder. The morphologies of the materials before and after the coating process were analyzed with SEM, and uniform coating of the fabrics was confirmed. FTIR spectra of the samples were compared to observe changes in the chemical functional groups, which showed the decrease in the substrate polymer peaks upon coating and the presence of Si-O bonding in some instances. The silica coating effect on the fabric samples’ thermal degradation was investigated using thermogravimetric analysis (TGA), showing that the thermal degradation behavior of the polymers mainly remained the same after the coating process. However, amounts of residual materials after burnout have differed with the coating type. The coatings’ mechanical performances were tested with tensile testing, which showed that the effect of the coating is highly dependent on the fabric material.

Keywords

Sol-gel, Silica, Coating, Cotton, Polyamide 6.6, Polyethylene terephthalate

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