ผลของปริมาณยางต่อสมบัติเชิงกลทางความร้อนของวัสดุประกอบแต่งพอลิเบนชอกชาซีน/ยาง

Abstract

The properties of composites based on benzoxazine resin and polybutadiene-co acrylonitrile (Amine-Terminated Butadiene Acrylonitrile, ATBN) copolymer as a matrix were investigated. The copolymer was varied using different resin percentage at 0, 3, 5, 10, 20 and 30 percent by weight of ATBN. The physical properties such as density were analyzed. The mechanical properties such as flexural strength, flexural strain and flexural modulus were tested by Universal Testing Machine. The thermal properties such as glass-transition temperature (T ) and decomposition temperature (Td) were measured by Dynamic Mechanical Analyzer (DMA) and Thermogravimetric Analysis (TGA) and the tribological properties such as friction coefficient and wear rate value were evaluated by Ball-on-Disc Tribometer. It is found that the incorporation of ATBN into the BA-a can improve the flexural and tribological properties of the polybenzoxazine. The flexural strength of the BA-a/ATBN copolymer consisted of 10 percent by weight of the ATBN was about 139.33 MPa, while that of the polybenzoxazine was about 116.23 MPa. The minimal friction coefficient and wear rate belonged to the BA-a/ATBN copolymer at 5 percent by weight of the ATBN. i.e. 0.328 and 5.64x1 o'4 mm/(m’N), respectively, those of the polybenzoxazine were higher than those of the copolymer, i.e. 0.333 and 6.25x1 o*4 mm/(m-N), respectively. Furthermore, composites consisted of BA-a/ATBN binder as various ATBN contents, Kevlar pulp as reinforcement, graphite as solid lubricant, alumina (A12O3) as abrasive and calcium carbonate (CaCOj) as filler were prepared by hydraulic compression. The result showed that the composite consisted of the ATBN at 5 percent by weight reveals the highest flexural strength 41.49 MPa and flexural modulus 5.94 GPa.