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

Authors : İbrahim Şen

Pages : 923-940

Doi:10.17482/uumfd.1663959

View : 82 | Download : 288

Publication Date : 2025-12-19

Article Type : Research Paper

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

ORIGINAL ARTICLE URL