Abstract
Different nanocomposites have been attained by in situ polymerization based on ultra-high molecular weight polyethylene (UHMWPE) and mesoporous SBA-15, this silica being used for immobilization of the FI catalyst bis [N-(3-tert-butylsalicylidene)-2,3,4,5,6-pentafluoroanilinato] titanium (IV) dichloride and as filler as well. Two distinct approaches have been selected for supporting the FI catalyst on the SBA-15 prior polymerization. A study on polymerization activity of this catalyst has been performed under homogenous conditions and upon heterogenization. A study of the effect of presence of mesoporous particles and of the immobilization method is also carried out. Moreover, the thermal characterization, phase transitions and mechanical response of some pristine UHMWPEs and UHMWPE/SBA-15 materials have been carried out. Relationships with variations on molar mass, impregnation method of catalyst and final SBA-15 content have been established.
Highlights
Ultra-high molecular weight polyethylene (UHMWPE) is a very attractive thermoplastic polymer due to its remarkable physical and mechanical properties, such as high chemical and abrasion resistance, good corrosion performance, high impact toughness, resistance to cyclic fatigue, and resistance to radiation [1,2,3]
Kaminsky et al [16] produced UHMWPE/multiwalled carbon nanotube (MWCNT) nanocomposites by using in situ polymerization with a metallocene catalyst, Sánchez et al [9] reported the preparation of UHMWPE/MWCNT nanocomposite using a TpTiCl2(Et) system and Park and Choi [17] attained UHMWPE/MWCNT nanocomposites by using half-titanocene catalytic system
Different UHMWPE homopolymers have been synthesized using a FI catalyst with living character. This catalyst has been immobilized by two different approaches onto SBA-15 particles giving rise to UHMWPE based composites
Summary
Ultra-high molecular weight polyethylene (UHMWPE) is a very attractive thermoplastic polymer due to its remarkable physical and mechanical properties, such as high chemical and abrasion resistance, good corrosion performance, high impact toughness, resistance to cyclic fatigue, and resistance to radiation [1,2,3]. Kaminsky et al [16] produced UHMWPE/multiwalled carbon nanotube (MWCNT) nanocomposites by using in situ polymerization with a metallocene catalyst, Sánchez et al [9] reported the preparation of UHMWPE/MWCNT nanocomposite using a TpTiCl2(Et) system and Park and Choi [17] attained UHMWPE/MWCNT nanocomposites by using half-titanocene catalytic system Ordered mesoporous silicas, such as MCM-41 and SBA-15, emerged in the 1990s and show a hexagonal arrangement of uniformly sized cylindrical pores, with a narrow pore size distribution and large surface area [18, 19].
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