Mechanical Properties and Morphology of Polypropylene Using Calcium Carbonate from Various Shells as Fillers

สมบัติเชิงกลและสัณฐานวิทยาของพอลิโพรพิลีนที่ใช้แคลเซียมคาร์บอเนตจากเปลือกหอยชนิดต่างๆ เป็นสารตัวเติม

Abstract

          This research used calcium carbonate from two types of shells: Cockle shells and Mussels shells. Both are solid wastes from nature used as a filler in polypropylene. The mixing ratio of 0-40% by weight was mixed with a counter-rotating twin screw extruder. Both shells were sintered at 500 and 900°C to see the change in crystal structure from the FTIR and XRD techniques. Calcium carbonate from both shells has a crystalline structure. Aragonite mixed with calcite. When calcined at 500°C, the crystals are completely calcite. When the sintering temperature was increased to 900°C, calcium carbonate shells with calcite crystal structure decomposed when heated to calcium oxide (CaO). Filler content 0%-20% by weight, stress, elongation at break, impact strength, and modulus show not change. While increasing the mixture ratio to 30%-40% by weight, stress, elongation at break, and impact strength value decreases, and the modulus increases. Consistent with SEM morphology at 30%-40% wt. filler agglomeration results in a decrease in mechanical properties. It was found that the shell type and the firing condition did not significantly affect the mechanical properties.