Different hybrid silica-encapsulated metallocene catalysts were prepared by a non-hydrolytic sol-gel method and evaluated in ethylene polymerization. The employed organic groups to modify the silica network were methyl, octyl, octadecyl, vinyl, phenyl, chloropropyl, iodopropyl and glycidoxypropil and the encapsulated catalyst was bis(cyclopentadienyl)zirconiun IV chloride. The catalysts were characterized in terms of zirconium content, structure and texture via Fourier transform infrared spectroscopy, x-ray absorption spectroscopy, nitrogen porosimetry and small angle x-ray scattering and morphology by transmission electronic microscopy. The polymerzation activity results varied in the range of 1650–2850 kg PE/mol Zr.p.h, showing an increase for all the hybrid materials if compared to the non-hybrid one. Polymers characteristics such as crystallinity, melting temperature and molecular weight were shown to be affected by the nature of the organic moieties present on the catalyst support. These findings highlight the material potentiality for tuning the product characteristics depending on the organosilane present on the catalyst system.

通过非水解溶胶-凝胶法制备了不同的杂化二氧化硅包封的茂金属催化剂，并在乙烯聚合中进行了评估。用来修饰二氧化硅网络的有机基团是甲基，辛基，十八烷基，乙烯基，苯基，氯丙基，碘丙基和环氧丙氧基丙烷，而被包封的催化剂是双（环戊二烯基）氧化锆IV氯化物。通过傅立叶变换红外光谱法，X射线吸收光谱法，氮孔隙率法和小角度X射线散射和形态，通过透射电子显微镜对催化剂的锆含量，结构和织构进行了表征。聚合活性结果在1650-2850 kg PE / mol Zr.ph的范围内变化，与非杂化材料相比，所有杂化材料均增加。聚合物特性如结晶度，熔融温度和分子量显示出受催化剂载体上存在的有机部分的性质影响。这些发现突出了根据催化剂体系上存在的有机硅烷调节产品特性的材料潜力。