PLA composites containing biomass fillers from the three herbaceous plants such as reed,wheat stalk,and coco-nut fiber with length and diameter at the scale of several millimeters were prepared without using additives...PLA composites containing biomass fillers from the three herbaceous plants such as reed,wheat stalk,and coco-nut fiber with length and diameter at the scale of several millimeters were prepared without using additives.The reinforcement effect on the properties of PLA/biomass filler composites is investigated.The research results show that the PLA/biomass filler composites exhibit good stiffness,flexural strength,and impact toughness.Among the three kinds of biomass fillers,reed reinforced PLA composites show optimal mechanical properties.When filled with 40%–50%reed,the flexural moduli of the composites are over 7000 MPa.Flexural strength retains at the same level of pure PLA.The notch impact strength reaches to 4.50±0.73 kJ/m^(2),which is 2.06 times higher than that of pure PLA.Furthermore,the introduction of biomass fillers increases the crystallization ability of PLA and does not increase the water absorption of the composites.This research demonstrated that PLA composites prepared with biomass fillers from the herbaceous plants(namely herb plastic composites,HPCs)is a material with good comprehensive mechanical properties while retaining the intrinsic particularity of biological sources.展开更多
Poly（lactic acid）-based biocomposites were developed with hemp hurd （Cannabis sativa L.） with grafting-based interfacial compatibilization. Poly（lactic acid） was extruded with hemp hurd and glycidyl methacrylate...Poly（lactic acid）-based biocomposites were developed with hemp hurd （Cannabis sativa L.） with grafting-based interfacial compatibilization. Poly（lactic acid） was extruded with hemp hurd and glycidyl methacrylate as the polymer/hurd interfacial compatibilizer, and injection molded. Interfacial compatibility between poly（lactic acid） and hemp hurd increased with grafted glycidyl methacrylate in comparison to the non-compatibilized control, as corroborated by scanning electron microscopy fractog- raphy and mechanical analysis, which showed increases in the glycidyl methacrylate-grafted 20% （w/w） hemp hurd/poly（lactic acid） biocomposite, retaining 94% of the neat polymer strength, with increases in crystallinity, and showing a range of thermo-mechanical properties desirable for rigid biocomposite aoolications.展开更多
Summary of main observation and conclusion Five types of ZrO2 are used to simply establish an effective aqueous catalytic system with sulfuric acid for the hydrolysis of cellulose to sugar,respectively.By adjusting su...Summary of main observation and conclusion Five types of ZrO2 are used to simply establish an effective aqueous catalytic system with sulfuric acid for the hydrolysis of cellulose to sugar,respectively.By adjusting surface roughness and particle size of ZrO2 dfferent adsorption is produced.Accordingy,following the thought to inhibit the self-aggregation nature of cellulose,after the introduction of ZrO2 with adsorption in catalysts,the efficiency of the hydrolysis of cellulose to sugar is improved.The results show different ZrO2 can produce different effects during the hydrolysis of the cellulose with rela-tively low crystallinity.Under the optimal conditions,the conversion of cellulose and TRS yield reaches 95.5%and 93.6%,respectively.Through this re-search,it reveals the critical point to organize a feasible and useful way for the hydrolysis of cellulose to sugar with high efficiency in an aqueous system.An important theoretical and technical support is also provided for the conversion and utiliation of cellulose in the future.展开更多
基金supported by“One Belt,One Road”Projects of China Academy of Sciences(174433KYSB20190082)Science and Technology Service Network Plan of China Academy of Sciences(KFJ-STS-QYZD-2021-16-002)+2 种基金Key Projects of Ningbo Public Welfare Science and Technology Plan(2021S020)Ningbo Natural Science Foundation(2021J196)Youth Innovation Promotion Association CAS(2017339).
文摘PLA composites containing biomass fillers from the three herbaceous plants such as reed,wheat stalk,and coco-nut fiber with length and diameter at the scale of several millimeters were prepared without using additives.The reinforcement effect on the properties of PLA/biomass filler composites is investigated.The research results show that the PLA/biomass filler composites exhibit good stiffness,flexural strength,and impact toughness.Among the three kinds of biomass fillers,reed reinforced PLA composites show optimal mechanical properties.When filled with 40%–50%reed,the flexural moduli of the composites are over 7000 MPa.Flexural strength retains at the same level of pure PLA.The notch impact strength reaches to 4.50±0.73 kJ/m^(2),which is 2.06 times higher than that of pure PLA.Furthermore,the introduction of biomass fillers increases the crystallization ability of PLA and does not increase the water absorption of the composites.This research demonstrated that PLA composites prepared with biomass fillers from the herbaceous plants(namely herb plastic composites,HPCs)is a material with good comprehensive mechanical properties while retaining the intrinsic particularity of biological sources.
基金the scholarship support received from University of Southern Queenslandfinancial support from the Ningbo Natural Science Foundation (Grant No. 2013A610023)Ningbo Key Laboratory of Polymeric Materials (Grant No. 2010A22001)
文摘Poly（lactic acid）-based biocomposites were developed with hemp hurd （Cannabis sativa L.） with grafting-based interfacial compatibilization. Poly（lactic acid） was extruded with hemp hurd and glycidyl methacrylate as the polymer/hurd interfacial compatibilizer, and injection molded. Interfacial compatibility between poly（lactic acid） and hemp hurd increased with grafted glycidyl methacrylate in comparison to the non-compatibilized control, as corroborated by scanning electron microscopy fractog- raphy and mechanical analysis, which showed increases in the glycidyl methacrylate-grafted 20% （w/w） hemp hurd/poly（lactic acid） biocomposite, retaining 94% of the neat polymer strength, with increases in crystallinity, and showing a range of thermo-mechanical properties desirable for rigid biocomposite aoolications.
基金We are grateful for the financial support by the National Nat-ural Science Foundation of China(Nos.51773217 and 21978310),the Key Research and Development Program of Shandong Prov-ince(No.2019JZZY020217),the Ningbo Natural Science Founda-tion(No.2019A610026),the Youth Innovation Promotion Associa-tion CAS(No.2017339),and the National Key Research and De-velopment Program of China(No.2017YFE0102300).We are also grateful for the help to use HPLC equipment provided by Dr.Yajie Zhang and his research group in Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences.
文摘Summary of main observation and conclusion Five types of ZrO2 are used to simply establish an effective aqueous catalytic system with sulfuric acid for the hydrolysis of cellulose to sugar,respectively.By adjusting surface roughness and particle size of ZrO2 dfferent adsorption is produced.Accordingy,following the thought to inhibit the self-aggregation nature of cellulose,after the introduction of ZrO2 with adsorption in catalysts,the efficiency of the hydrolysis of cellulose to sugar is improved.The results show different ZrO2 can produce different effects during the hydrolysis of the cellulose with rela-tively low crystallinity.Under the optimal conditions,the conversion of cellulose and TRS yield reaches 95.5%and 93.6%,respectively.Through this re-search,it reveals the critical point to organize a feasible and useful way for the hydrolysis of cellulose to sugar with high efficiency in an aqueous system.An important theoretical and technical support is also provided for the conversion and utiliation of cellulose in the future.
