Effect of filler preparation methods on mechanical properties of Natural Rubber (NR) latex films
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Date
2016-06
Authors
Muhammad Rafaie Hashim
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Abstract
The aim of this research work is to study the effect of filler preparation method on mechanical properties of natural rubber (NR) latex film. In order to find best time for filler dispersion preparation method, calcium carbonate, CaCO3 was chosen to be dispersed using ball milling with 24 hours, 48 hours and 72 hours and using ultrasonic with variable of 30 minutes, 60 minutes and 120 minutes. The best processing time was achieved at 72 hours for ball milling process, highest tensile strength but lower in tear strength compare to others ball milling time. Smallest particles size was achieved at 120 minutes of sonication with highest tensile strength of NR latex films. Both processing time was combined where 72 hours of ball milling followed by 120 minutes of sonication for further investigation and named as method one. Another method was carried out with same parameter which 120 minutes of sonication followed with 72 hours ball milling was also carried out. The result shows tensile strength of NR latex films decreases with addition of CaCO3 but tear strength decreases. Percentages of swelling increased increases but cross link density decreases. The best method was chosen based on highest mechanical properties and applied to titanium dioxide (TiO2), Silica (Si) and Carbon Black (CB). Tensile strength of Si recorded the highest and TiO2 is the lowest but tear strength shows the opposite trends. Morphological studies was done when method one was carried on others filler where SEM images showed rougher surface indicate ductile failure due to amorphous properties of fillers on NR latex films. The final result shows 72 hours ball milling followed with 120 minutes proved to be the best preparation method.