The present research aims to utilize the acrylic Core-Shell Rubber （CSR） particles to reduce the brittleness in Wood Plastic Composites （WPC） prepared from poly（lactic acid） （PLA） and rubber wood sawdust （Hev...The present research aims to utilize the acrylic Core-Shell Rubber （CSR） particles to reduce the brittleness in Wood Plastic Composites （WPC） prepared from poly（lactic acid） （PLA） and rubber wood sawdust （Hevea brasiliensis）. Experimental works consisted of two major parts. The first part concentrated on toughening PLA by using CSR particles. Mechanical tests revealed that PLA had become tougher with a more than five times increment in the impact strength when the CSR was added at only 5 wt%. The modified PLA was less stiff with the significant reductions of both elastic and flexural moduli and strengths. The second part focused on producing WPC from the toughened PLA and rubber wood sawdust. The tensile moduli and the strengths of the PLA composites increased with rubber wood content. The composites turned out to be more brittle with reductions of both the impact strength and the tensile elongation at break at all the sawdust contents. Toughening PLA/wood flour with 5 wt% CSR improved both the impact strength and the tensile elongation at break. The toughness enhancement was also depicted by the plastic deformation observed on the surfaces of fractured PLA/CSR/wood sawdust composites.展开更多
Application of out-of-service rubber from a variety of sources is of both environment-protecting and resource-saving importance.To that end,recycled tire rubber was utilized as a filler to fabricate wood-high density ...Application of out-of-service rubber from a variety of sources is of both environment-protecting and resource-saving importance.To that end,recycled tire rubber was utilized as a filler to fabricate wood-high density polyethylene(HDPE)composite with enhanced toughening performance using the injection procedure in this work.Dosages of rubber powders were 0,5,10,and 15wt%based on the overall weight of poplar wood flour and HDPE(HDPE:wood flour=70꞉30).The injection-fabricated composites were subjected to a four-cycle repetitive compressing loadings(0-3 kN)and dynamical mechanical analysis(DMA,room temperature to 150℃,in the dual cantilever mode).It was found that the rubber-filled materials exhibit advantageous energy absorption performance compared to wood-HDPE composites under repetitive compressions.The rubber-filled wood-HDPE composites are thermomechanically labile in an environment with raised temperature.The HDPE matrix substance occupies the predominant role in thermally yielding of the overall composite,typically in the temperature range of 50-75℃ resulting in a loss modulus peak.Up to 130-150℃,all the composites fully loses their moduli with loss factor(Tan δ)reaching its peak values of 0.30-0.38.To conclude,rubber-filled wood-HDPE is a qualified material applicable in proper temperature range.展开更多
文摘The present research aims to utilize the acrylic Core-Shell Rubber （CSR） particles to reduce the brittleness in Wood Plastic Composites （WPC） prepared from poly（lactic acid） （PLA） and rubber wood sawdust （Hevea brasiliensis）. Experimental works consisted of two major parts. The first part concentrated on toughening PLA by using CSR particles. Mechanical tests revealed that PLA had become tougher with a more than five times increment in the impact strength when the CSR was added at only 5 wt%. The modified PLA was less stiff with the significant reductions of both elastic and flexural moduli and strengths. The second part focused on producing WPC from the toughened PLA and rubber wood sawdust. The tensile moduli and the strengths of the PLA composites increased with rubber wood content. The composites turned out to be more brittle with reductions of both the impact strength and the tensile elongation at break at all the sawdust contents. Toughening PLA/wood flour with 5 wt% CSR improved both the impact strength and the tensile elongation at break. The toughness enhancement was also depicted by the plastic deformation observed on the surfaces of fractured PLA/CSR/wood sawdust composites.
基金supported by the Key Programs for Provincial Innovation of Hubei(No.2019ABA097)National Alliance of Wood/Bamboo Industries(No.TIAWBI2018).
文摘Application of out-of-service rubber from a variety of sources is of both environment-protecting and resource-saving importance.To that end,recycled tire rubber was utilized as a filler to fabricate wood-high density polyethylene(HDPE)composite with enhanced toughening performance using the injection procedure in this work.Dosages of rubber powders were 0,5,10,and 15wt%based on the overall weight of poplar wood flour and HDPE(HDPE:wood flour=70꞉30).The injection-fabricated composites were subjected to a four-cycle repetitive compressing loadings(0-3 kN)and dynamical mechanical analysis(DMA,room temperature to 150℃,in the dual cantilever mode).It was found that the rubber-filled materials exhibit advantageous energy absorption performance compared to wood-HDPE composites under repetitive compressions.The rubber-filled wood-HDPE composites are thermomechanically labile in an environment with raised temperature.The HDPE matrix substance occupies the predominant role in thermally yielding of the overall composite,typically in the temperature range of 50-75℃ resulting in a loss modulus peak.Up to 130-150℃,all the composites fully loses their moduli with loss factor(Tan δ)reaching its peak values of 0.30-0.38.To conclude,rubber-filled wood-HDPE is a qualified material applicable in proper temperature range.
