| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 99 === The purpose of this study is to develop and manufacture wood plastic composite core plywood (WPCP) from wood particles (Pinus taiwanensis), different kinds of plastics (including vHDPE, rHDPE and rLDPE) and untreated/acetylated veneer (Pinus radiata) by one-step hot press molding. The effect of density, plastic and acetylated veneer on physicomechanicl properties of WPCP were evaluated by universl testing machine, color difference meter, stylus-type surface profilometer, gloss meter, attenuated total reflectance–Fourier transform infrared spectroscopy (ATR–FTIR) and X-ray density profiler, etc. Results revealed that, among WPCP with various densities, 800 kg/m3 of WPCP exhibited high performance on dimensional stability and mechanicl properties. In addition, the recycled HDPE based WPCP showed the similar physicomechanicl properties to the virgin HDPE based WPCP. On the other hand, the water absorption and the thickness swelling of WPCP with acetylated veneer were lower than those of untreated WPCP. As well as the surface tensile strength of WPCP increased with increasing the weight gain of acetylated veneer. Furthermore, the results of outdoor weathering demonstrated that not only the photostability, but also the MOE retention ratio and surface tensile strength of WPCP with acetylated veneer were significantly higher than those of WPCP with untreated veneer. Moreover, the rHDPE crystallinity of WPC was significantly increased, while the rHDPE crystallinity of WPCP was not significantly different during 64 days of outdoor weathering. Accordingly, it concludes that better dimensional stability, surface tensile strength and weathering properties could be achieved when the WPCP made by the acetylated veneer.
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