SiO₂ İlavesinin Borik Asit Çapraz Bağlı Polivinil Alkol (PVA) Filmlerinin Mekanik ve Termal Özellikleri Üzerindeki Etkisi

Abstract

Bu çalışmada, suda çözünebilen polivinil alkol (PVA) hem borik asit (BA) ile çapraz bağlanarak hem de çapraz bağlı PVA'ya farklı oranlarda SiO2 eklenerek termal, mekanik ve kimyasal değişimleri incelenmiştir. Mekanik özellikler için çekme mukavemeti (TS), maksimum çekme mukavemetinde yüzde uzama (ETS) ve elastik modül (EM) parametreleri araştırılmıştır. Bulgular, BA ile çapraz bağlamanın TS ve EM değerlerinde bir artışa yol açtığını ve ETS'de bir azalmaya neden olduğunu ortaya koymuştur. Buna karşılık, SiO2'nin dolgu malzemesi olarak dahil edilmesi tüm parametrelerde düşüşe neden olmuştur. Termal özellikleri aydınlatmak için diferansiyel taramalı kalorimetri (DSC), termogravimetrik analiz (TGA) ve dinamik mekanik analiz (DMA) yapılmıştır. Sonuçlar, BA ile çapraz bağlamanın termal kararlılığı önemli ölçüde artırdığını, SiO2 ilavesinin ise önemli değişiklikler sağlamadığını göstermiştir. DSC analizine göre, hem BA ile çapraz bağlama hem de çapraz bağlı PVA'ya SiO2 eklenmesi, PVA filmlerinin camsı geçiş sıcaklığında (Tg) düzenli artışlara neden oldu. DMA analizinde tan δ termogramında Tg pikleri gözlenmiş ve bu piklerdeki artışın dalgalı olduğu tespit edilmiştir.

Keywords

• Polivinil alkol (PVA)
• Borik asit
• çapraz bağlama
• SiO2
• mekanik ve termal özellikler

EFFECT OF SiO₂ ADDITION ON MECHANICAL AND THERMAL PROPERTIES OF BORIC ACID CROSSLINKED POLYVINYL ALCOHOL (PVA) FİLMS

Abstract

In this study, the thermal, mechanical and chemical changes of water-soluble polyvinyl alcohol (PVA) were investigated both by crosslinking with boric acid (BA) and by adding SiO2 at different ratios into crosslinked PVA. Tensile strength (TS), percentage elongation at maximum tensile strength (ETS) and elastic modulus (EM) parameters were investigated for mechanical properties. The findings revealed that crosslinking with BA led to an enhancement in TS and EM values, accompanied by a reduction in ETS. Conversely, the incorporation of SiO2 as a filler material resulted in a decline in all parameters. To elucidate the thermal properties, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) were conducted. The results indicated that crosslinking with BA significantly improved the thermal stability, while the addition of SiO2 did not yield substantial changes. According to the DSC analysis, both cross-linking with BA and the addition of SiO2 to cross-linked PVA resulted in regular increases in the glass transition temperature (Tg) of PVA films. Tg peaks were observed in the tan δ thermogram in the DMA analysis, and the increase in these peaks was found to be wavy.

Keywords

• Polyvinyl alcohol (PVA)
• Boric acid
• crosslinking
• SiO2
• mechanic and thermal properties

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