制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、...制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究。结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23。展开更多
The uniform zirconia nanoparticle multilayers/micrometer-sized silica particle(ZrO 2/SiO 2) was prepared for HPLC support material by layer-by-layer(LbL) self-assembly technique. XRD pattern shows that the crystalline...The uniform zirconia nanoparticle multilayers/micrometer-sized silica particle(ZrO 2/SiO 2) was prepared for HPLC support material by layer-by-layer(LbL) self-assembly technique. XRD pattern shows that the crystalline of nanometer particles on the surface is pure tetragonal zirconia, with a diameter of 13^9 nm. The specific surface area, pore volume and pore size of the material are 172.53 m 2/g, 0.378 4 cm 3/g, and 8.5 nm, respectively. The novel support not only has the mechanical strength and chemical stability of zirconia, but also has the good chromatographic features such as larger surface area, better permeability, less background pressure.展开更多
文摘制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温^(13)CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究。结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23。
文摘The uniform zirconia nanoparticle multilayers/micrometer-sized silica particle(ZrO 2/SiO 2) was prepared for HPLC support material by layer-by-layer(LbL) self-assembly technique. XRD pattern shows that the crystalline of nanometer particles on the surface is pure tetragonal zirconia, with a diameter of 13^9 nm. The specific surface area, pore volume and pore size of the material are 172.53 m 2/g, 0.378 4 cm 3/g, and 8.5 nm, respectively. The novel support not only has the mechanical strength and chemical stability of zirconia, but also has the good chromatographic features such as larger surface area, better permeability, less background pressure.
