單板層積及密度對竹材聚乳酸複合材料物理機械性質之影響

Effects of Veneer Lamination and Density on Physicomechanical Properties of Bamboo–Polylactic Acid Composites

本研究利用桂竹（Phyllostachys makinoi）加工廢料及聚乳酸（Polylactic acid，PLA）製備竹材聚乳酸複合材料（Bamboo-PLA composite，BPC）。同時，利用萬能強度試驗機、色差計及表面粗糙度儀等儀器，探討單板層積及密度對竹材聚乳酸複合材料物理機械（Physicomechanical）性質之影響。試驗結果顯示，BPC之吸水率隨著密度增加而減少，其抗彎強度及抗彎彈性模數則隨著密度的增加而增加；其中，密度900 kg/m3 者具有最佳之抗彎強度（42.4 MPa）及抗彎彈性模數（4.1 GPa）。而利用單板層積所製備之BPC板心合板（BPC core plywood，BPCP），相較於BPC （900 kg/m3 ）可提升約 2.3倍之抗彎強度，而抗彎彈性模數約可提高2.0倍，顯示單板層積確實有助於提升BPC之物理機械性質。 In this study, makino bamboo (Phyllostachys makinoi) residue and polylactic acid (PLA) were used as raw materials to manufacture bamboo-PLA composite (BPC). Effects of veneer lamination and density on physicomechanical properties of BPC were evaluated by universal testing machine, color difference meter and surface roughness measuring instrument, etc. Results showed that the water absorption decreased with increasing BPC density, while the modulus of rupture (MOR) and modulus of elasticity (MOE) increased with increasing density. The BPC with a density of 900 kg/m3 exhibited the strongest MOR (42.4 MPa) and MOE (4.1 GPa). On the other hand, the BPC core plywood (BPCP) with a density of 900 kg/m3 showed 2.3-fold and 2.0-fold enhancements in MOR and MOE as compared to BPC with a density of 900 kg/m3 , respectively. These results demonstrated that the manufacture technology of veneer lamination can improve the mechanical property for BPC.