通过低密度聚乙烯熔融挤出接枝MAH(马来酸酐)研究了单体及复配单体、引发剂及复配引发剂对LDPE接枝的影响,并用红外光谱法证实了接枝反应。研究表明:复配单体和复配引发剂用量对接枝率有较大影响,AA(丙烯酸)的加入提高了接枝率,DCP/BPO...通过低密度聚乙烯熔融挤出接枝MAH(马来酸酐)研究了单体及复配单体、引发剂及复配引发剂对LDPE接枝的影响,并用红外光谱法证实了接枝反应。研究表明:复配单体和复配引发剂用量对接枝率有较大影响,AA(丙烯酸)的加入提高了接枝率,DCP/BPO为3/1时接枝率最高。在聚乙烯防雾膜中加入PE g MAH接枝共聚物可提高膜的防雾性。展开更多
New strain induced melt activation（new SIMA） method was employed to prepare high-quality semisolid billet of AZ61 magnesium alloy.Optical microscopy and tensile test were used to study the microstructure and mechani...New strain induced melt activation（new SIMA） method was employed to prepare high-quality semisolid billet of AZ61 magnesium alloy.Optical microscopy and tensile test were used to study the microstructure and mechanical properties of the thixo-extruded component.The results showed that the optimal process parameters for achieving the complete filling status involved the applied pressure of 784 MPa,the pressure holding time of 90 s and the die temperature of 450 ℃.Compared to semisolid isothermal treatment,high mechanical properties such as the tensile strength of 300.5 MPa and elongation of 22% and fine microstructure were obtained in the thixo-extruded parts.With increasing the isothermal temperature and holding time,the tensile strength and elongation were increased firstly and then decreased.When the press pass was increased from 1 to 4,the tensile strength and elongation of the thixo-extruded parts were greatly enhanced and microstructure was refined obviously.展开更多
High Density Polyethylene （HDPE） composites reinforced with treated bio-filler from Argan-Nut Shell （ANS） at various filler contents are prepared by extrusion and injection molding processes. The microstructures o...High Density Polyethylene （HDPE） composites reinforced with treated bio-filler from Argan-Nut Shell （ANS） at various filler contents are prepared by extrusion and injection molding processes. The microstructures of the composites are charac- terized by Fourier Transform Infrared Spectroscopy （FTIS） and Scanning Electron Microscopy （SEM）; the thermal stability is analyzed by Thermogravimetric Analysis （TGA）, and their mechanical properties are investigated by dynamical mechanical analysis and rheological testing. The morphological and structural results indicate an improvement in adhesion between the ANS fillers and HDPE matrix upon alkali treatment. The mechanical properties of the composites show a significant increase in young＇s modulus with the addition of filler, a gain of 58% is marked compared to neat polymer, Thermal analysis reveals that the incorporation of bio-filler in polymer results in a decrease in decomposition temperatures. This research offers an ecological alternative to upgrade the valorization of abundant and unexploited Moroccan resources. In addition, the possibility of finding uses for ANS in composite manufacturing will help open new markets for what is normally considered waste or for use in low value products.展开更多
文摘通过低密度聚乙烯熔融挤出接枝MAH(马来酸酐)研究了单体及复配单体、引发剂及复配引发剂对LDPE接枝的影响,并用红外光谱法证实了接枝反应。研究表明:复配单体和复配引发剂用量对接枝率有较大影响,AA(丙烯酸)的加入提高了接枝率,DCP/BPO为3/1时接枝率最高。在聚乙烯防雾膜中加入PE g MAH接枝共聚物可提高膜的防雾性。
基金Project(51075099) supported by the National Natural Science Foundation of ChinaProject(E201038) supported by the Natural Science Foundation of Heilongjiang Province,China+3 种基金Project(20090460884) supported by the China Postdoctoral Science FoundationProjects (HIT.NSRIF.2013007 and 2012038) supported by the Fundamental Research Funds for the Central Universities,ChinaProject (2011RFQXG010) supported by the Harbin City Young Scientists Foundation under the GrantProject(LBH-T1102) supported by the Specially Postdoctoral Science Foundation of Heilongjiang Province,China
文摘New strain induced melt activation（new SIMA） method was employed to prepare high-quality semisolid billet of AZ61 magnesium alloy.Optical microscopy and tensile test were used to study the microstructure and mechanical properties of the thixo-extruded component.The results showed that the optimal process parameters for achieving the complete filling status involved the applied pressure of 784 MPa,the pressure holding time of 90 s and the die temperature of 450 ℃.Compared to semisolid isothermal treatment,high mechanical properties such as the tensile strength of 300.5 MPa and elongation of 22% and fine microstructure were obtained in the thixo-extruded parts.With increasing the isothermal temperature and holding time,the tensile strength and elongation were increased firstly and then decreased.When the press pass was increased from 1 to 4,the tensile strength and elongation of the thixo-extruded parts were greatly enhanced and microstructure was refined obviously.
文摘High Density Polyethylene （HDPE） composites reinforced with treated bio-filler from Argan-Nut Shell （ANS） at various filler contents are prepared by extrusion and injection molding processes. The microstructures of the composites are charac- terized by Fourier Transform Infrared Spectroscopy （FTIS） and Scanning Electron Microscopy （SEM）; the thermal stability is analyzed by Thermogravimetric Analysis （TGA）, and their mechanical properties are investigated by dynamical mechanical analysis and rheological testing. The morphological and structural results indicate an improvement in adhesion between the ANS fillers and HDPE matrix upon alkali treatment. The mechanical properties of the composites show a significant increase in young＇s modulus with the addition of filler, a gain of 58% is marked compared to neat polymer, Thermal analysis reveals that the incorporation of bio-filler in polymer results in a decrease in decomposition temperatures. This research offers an ecological alternative to upgrade the valorization of abundant and unexploited Moroccan resources. In addition, the possibility of finding uses for ANS in composite manufacturing will help open new markets for what is normally considered waste or for use in low value products.
