| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 104 === In this study, makino bamboo (Phyllostachys makinoi) residue, bio-char and polypropylene (PP) were used as raw materials to manufacture the layered bamboo plastic composite (BPCL). The effects of bamboo/PP ratio and layering on physicomechanical properties and crystallization kinetics of BPCL were evaluated by universal testing machine, X-ray density profiler and differential scanning calorimetry (DSC), etc. These results showed that the 3-layer BPCL with volume ratio 1:3:1 and surface/back layer with 40 wt% bamboo content exhibited the best physicomechanical properties. In addition, the BPCL with 5 wt% bio-char in core layer has the best moisture resistance and wood screw-holding strength, whereas the flexural properties of BPCL could be increased by adding 1 wt% bio-char in core layer. To predict the long-term creep behavior of BPCL, a short-term and accelerated creep testing method, termed the stepped isostress method (SSM) was used. The results indicated that the creep master curves constructed from the different SSM testing parameters have highly consistency. Moreover, the creep resistance of single layer BPC was better than that of BPCL.
With regard to crystallization kinetics analysis, the non-isothermal crystallization kinetic models were applied to investigate the effects of bamboo particle and bio-char content on the crystallization behavior of plastic matrix within the BPC. The results showed that the crystallization rate of PP increased with increasing the bamboo content of composites. In contrast, adding the bio-char into the composite, which hinder the rearrangement of PP molecular chains to crystal surface, could reduce the crystallization rate of PP in the composites. As for the crystallization activation energ, the crystallization activation energy of composites was smaller than that of neat PP, when the amount of bamboo was less than 40 wt%. Once the bamboo loading exceeded 40 wt%, however, the activation energy of composites was similar to neat PP. Furthermore, the crystallization activation energy of composite increased with the addition of 1 and 5 wt% bio-char into a composite, and there were no significant differences between the activation energy of composites with 3 wt% bio-char and the without one.
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