Physical and Mechanical Properties of Randu and Angsana Impregnated with Polystyrene
Hadi, Yusuf Sudo
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The aim of this research was to know the physical and mechanical properties of Randu (Ceiba pentandra Gaertn) and Angsana (Pterocarpus indicus) polystyrene. Clear specimens were used with dimension 2 x 2 x 30 cm with MC 7 %. Replication of wood sample was three. Samples were divided into 3 treatments; there were control, soaked and vacuum-pressured. Three of each species were soaked by styrene monomer liquid for 3 days. The others were put in tank and given treatment by vacuum at 600 mm Hg for 30 minutes, then Pressured at 10 kg/cm2 for 30 minutes. After that, woods were wrapped by aluminum foil and dried with temperature 60oC for 24 hours to make polymerize, then conditioned in the room for 2 weeks. The result showed that average of polymer loading by soaking on Randu wood and vacuum-pressure were 32.20% and 92.43%, respectively. While by soaked on Angsana wood and vacuum-pressure were 22.20% and 68.71%, respectively. There were increasing in density, stability of dimension, hardness, modulus of elasticity (MOE), modulus of rupture (MOR) and compression parallel to grain.