Polilaktit-Perlit Kompozitlerinin Termal Bozunma Kinetiğinin İncelenmesi

Abstract

Bu çalışmada; biyobozunur ve biyouyumlu olan polilaktitin, düşük maliyetli perlit ile farklı oranlarda kompozitleri hazırlanarak inert atmosferde termal bozunma davranışı ve kinetiği incelendi. Polilaktit, (PLA), kalay oktoat varlığında halka açılma polimerizasyonuyla sentezlenerek; FTIR, 1H-NMR, 13C-NMR, GPC ve TGA ile karakterize edildi. Polimerin sayı ortalama moleküler ağırlığı (Mn) 20,091 g/mol olarak bulundu. Sentezlenen PLA, %10, %20 ve %40 oranlarında perlit ile karıştırılarak çözgen uçurma yöntemiyle PLA/perlit kompozitleri hazırlandı. Kompozitlerin yapısı FTIR ile karakterize edilirken termal özellikleri TGA ile incelendi. Saf PLA’ya göre PLA/perlit (60/40) kompozitinin termal dayanımının 35 °C arttığı tespit edildi. Polimer ve kompozit malzemenin termal bozunma kinetiği farklı ısıtma hızlarında (5-10-15 ve 20 °C /dk) termogravimetrik analiz ile Flynn-Wall-Ozawa, Tang ve Kissinger metotları ile incelendi. Termal bozunma aktivasyon enerjileri sırasıyla 114,59 kJ/mol, 112,06 kJ/mol ve 124,12 kJ/mol olarak bulundu.

Keywords

• Polilaktit
• perlit
• biyobozunur polimer kompoziti
• termal bozunma kinetiği

Investigation of Thermal Degradation Kinetics of Polylactide-Perlite Composites

Abstract

In this study, the thermal degradation behavior and kinetics of biodegradable and biocompatible polylactide were investigated by preparing composites with low-cost perlite at various ratios under an inert atmosphere. Polylactide (PLA) was characterized with FTIR, 1H-NMR, 13C-NMR, GPC and TGA after being synthesized with ring-opening polymerization in the presence of tin octoate. The number average molecular weight of polymer (Mn) was determined as 20.091 g/mol. PLA/perlite composites were prepared with the method of solvent casting, by mixing the synthesized PLA in ratios of 10%, 20% and 40% with perlite. While the structure of the composites was characterized with FTIR, their thermal characteristics were examined with TGA. It was found that the thermal stability of the PLA/perlite (60/40) composite increased by 35 °C compared to pure PLA. The thermal degradation kinetics of the polymeric and composite material was examined at different heating speeds (5-10-15 and 20 °C/min) with thermogravimetric analysis using the Flynn-Wall-Ozawa, Tang and Kissinger methods. The thermal degradation activation energies were determined as 114.59 kJ/mol, 112.06 kJ/mol and 124.12 kJ/mol respectively.

Keywords

• Polylactide
• perlite
• biodegradable polymers composite
• thermal degradation kinetics

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