An Investigation Of Acrylonitrile Butadiene Styrene (ABS) Impact Properties Subjected To Thermal Degradation

Mohidin, Nur Amira (2017) An Investigation Of Acrylonitrile Butadiene Styrene (ABS) Impact Properties Subjected To Thermal Degradation. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays, ABS can be said as one of the material that keeps enlarging its applications field especially in electronics devices. ABS is used everywhere without being acknowledge by the consumers. Due to ABS was said as a hard and tough polymers and applications of ABS were at various environmental condition, this study is conducted to investigate the impact properties effect of pure ABS after being exposed at different temperatures and times by charpy impact test method. Exposing the ABS at different temperatures and times are best known as thermally degrading the material. Therefore, this study is aim to investigate the impact energy (absorbed energy) value of ABS subjected to thermal degradation method and also characterize the morphological surface of ABS after being thermally degrade. The samples was fabricated by hot press method and cut into desired shape by referring to ASTM charpy test standard dimension for polymers materials. Samples will be heated at different temperatures under condition defined as 50oC and 80oC and at different times defined as 10, 30 and 50 hours in an oven. Samples at room temperature are also prepared for this experimental investigation for a reference and comparison purpose. Then, the charpy test was conducted to obtain the impact energy value, resilience and percentage of absorbed energy of thermally degrade ABS samples under constant mass, speed, angle and height for the hammer to swing. Moreover, the morphological test was conducted by SEM machine to analyse the fracture behaviour of samples under same magnification. The samples exposed at 80oC temperature absorbed less energy before it breaks into two pieces compared to samples that was exposed at 50oC and the longer the time the samples were heated in the same temperature, the smaller energy it absorbed to fracture the specimen. The fractographic results from SEM recognised an obvious brittle failure mode only exist in samples at 80oC temperature heated for 50 hours by the presence of flat surface structure while others are still behaving as ductile and respectively shows ABS are good and safe to be used at low temperature environmental condition.

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