不同酯基对HQ催化剂的影响Ⅰ:组分和结构

Effects of different ester groups-on HQ catalystⅠ:Composition and structure

基于一种新型载体,使用不同碳链长度的邻苯二甲酸酯为给电子体合成了Ziegler-Natta催化剂。利用FTIR,^(13)C NMR,XRD等方法对催化剂的化学组成与结构进行了表征。表征结果显示,酯的烷氧基碳数对催化剂的酯含量有较大影响,以邻苯二甲酸二甲酯(DMP)为给电子体时,催化剂的酯含量最高;邻苯二甲酸二乙酯(DEP)与MgCl_(2)间的络合作用最弱,因此DEP为给电子体时,催化剂的酯含量最低。由于四氯化钛的络合竞争,催化剂中酯与MgCl_(2)基体的络合形式明显减少,其中,邻苯二甲酸二丁酯与MgCl_(2)基体的络合方式较单一。以邻苯二甲酸二丙酯为给电子体时所制备催化剂的晶粒尺寸最小,而DMP为给电子体时所制备催化剂的晶粒尺寸最大。

Based on a new type of carrier,Ziegler-Natta catalysts were synthesized using phthalates with different carbon chain lengths as electron donors.The chemical composition and structure of the catalyst were characterized by FTIR,^(13)C NMR and XRD.The results show that the carbon number of the alkoxy has a great influence on the ester content in the catalyst.When dimethyl phthalate(DMP)is the electron donor,the ester content of the catalyst is the highest.The weakest complexation between diethyl phthalate(DEP)and MgCl_(2) results in the lowest ester content of the catalyst when DEP is the electron donor.Due to the complexation competition of titanium tetrachloride,the complexation form of ester and MgCl_(2) in the catalyst is significantly reduced,in which the complexation mode of dibutyl phthalate and MgCl_(2) is relatively single.The crystal grain size of the catalyst prepared with dipropyl phthalate as the electron donor is the smallest,while that of the catalyst prepared with DMP as the electron donor is the largest.