Thermal properties of hydroxylated natural rubber from in-situ hydroxylation process

摘要

A thermal property of hydroxylation of natural latex has been studied in this research. The effect of the hydroxylation conversion of the double bond to hydroxyl functionality of natural rubber in one pot solution using in-situ method. It was studied at different duration; 10, 20, 30, 40 and 50 hours of reaction. A mechanism for the hydroxylation of the natural rubber was also proposed. The result shows the optimum conversions of double bond to hydroxyl functionality was recorded highest at 40 hours and remain constant although the reaction was continued until 50hrs. Fourier Transform (FT) Raman spectroscopy was used to analyze the conversion. ~(-1)HNMR was used to confirm the formation of hydroxyl to support the peak from FT Raman spectra. Differential Scanning Calorimetric analysis was used to analyze the glass transition temperature (Tg) of modified and unmodified natural rubber. The result showed lower Tg in modified natural rubber compared to the unmodified natural rubber. On the other hand, the onset of thermal degradation of modified natural rubber recorded at 220°C compared to the unmodified natural rubber.