以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧...以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧亚胺锆催化剂,用于催化乙烯聚合制备超高分子量聚乙烯。在聚合温度为70℃,乙烯压力1.0 MPa,n(Al)/n(Zr)=7000条件下,以甲苯为溶剂,催化剂j的催化活性可达8.45 kg PE/(mmol·Zr·h),所得聚乙烯的黏均分子量介于100×104~800×104 g/mol,其熔点139℃,结晶度49.7%。展开更多
Magnesium hydroxide(MH),which is commonly used as a halogen-free flame retardant filler in composite materials,was modified by silanization reaction with γ-aminopropyltriethoxysilane (γ-APS) in aqueous solution at d...Magnesium hydroxide(MH),which is commonly used as a halogen-free flame retardant filler in composite materials,was modified by silanization reaction with γ-aminopropyltriethoxysilane (γ-APS) in aqueous solution at different pH values (pH range from 8.0 to 12.0). The surface properties of grafted γ-APS on MH surface as a function of solution pH value were studied using elemental analysis,Fourier transform infrared spectroscopy and zeta potential measurement. The results show that hydrolysis and condensation of γ-APS are activated in alkaline solution and lead to multilayer adsorption of γ-APS molecules on the surface of MH. The type of adsorption orientation of γ-APS on MH surface is a function of coverage density that is altered by changing solution pH value. At low coverage density (e.g. 55 nm-2),γ-APS molecules are preferentially adsorbed to the surface with the silicon moiety towards the surface,and increasing coverage density (e.g. 90 nm-2) leads to parallel orientation. At an even higher coverage density (e.g. 115 nm-2),γ-APS molecules bond to the surface with the amino moiety towards the surface.展开更多
文摘以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧亚胺锆催化剂,用于催化乙烯聚合制备超高分子量聚乙烯。在聚合温度为70℃,乙烯压力1.0 MPa,n(Al)/n(Zr)=7000条件下,以甲苯为溶剂,催化剂j的催化活性可达8.45 kg PE/(mmol·Zr·h),所得聚乙烯的黏均分子量介于100×104~800×104 g/mol,其熔点139℃,结晶度49.7%。
基金Projects(50574104 50574102) supported by the National Natural Science Foundation of China
文摘Magnesium hydroxide(MH),which is commonly used as a halogen-free flame retardant filler in composite materials,was modified by silanization reaction with γ-aminopropyltriethoxysilane (γ-APS) in aqueous solution at different pH values (pH range from 8.0 to 12.0). The surface properties of grafted γ-APS on MH surface as a function of solution pH value were studied using elemental analysis,Fourier transform infrared spectroscopy and zeta potential measurement. The results show that hydrolysis and condensation of γ-APS are activated in alkaline solution and lead to multilayer adsorption of γ-APS molecules on the surface of MH. The type of adsorption orientation of γ-APS on MH surface is a function of coverage density that is altered by changing solution pH value. At low coverage density (e.g. 55 nm-2),γ-APS molecules are preferentially adsorbed to the surface with the silicon moiety towards the surface,and increasing coverage density (e.g. 90 nm-2) leads to parallel orientation. At an even higher coverage density (e.g. 115 nm-2),γ-APS molecules bond to the surface with the amino moiety towards the surface.
