In principle, it is possible to design catalysts producing disentangled polyolefin
and extended chain polyolefin crystals. When polymerization takes place below the
melting temperature, the polyolefin chains do not form highly entangled random
coils. Lowering the polymerization rate relative to the crystallization rate, reducing
the number of active sites, and designing novel catalyst systems enables the
Fig. 13 Molar mass of HDPE/UHMWPE reactor blends prepared on silica-cosupported Cr-1/
Fe-2/Cr-3 multi-site catalysts with variable amount of Cr-3 (Reprinted with the permission of
[190] Copyright 2010 Wiley VCH)
Fig. 14 Melt processing of HDPE/UHMWPE reactor blends (a), produced by multi-site catalysis,
affords polyethylene reinforced with in situ formed shish–kebab UHMWPE nanofibers (b, c) [192]
Polyolefin Nanocomposites and Hybrid Catalysts
297
and extended chain polyolefin crystals. When polymerization takes place below the
melting temperature, the polyolefin chains do not form highly entangled random
coils. Lowering the polymerization rate relative to the crystallization rate, reducing
the number of active sites, and designing novel catalyst systems enables the
Fig. 13 Molar mass of HDPE/UHMWPE reactor blends prepared on silica-cosupported Cr-1/
Fe-2/Cr-3 multi-site catalysts with variable amount of Cr-3 (Reprinted with the permission of
[190] Copyright 2010 Wiley VCH)
Fig. 14 Melt processing of HDPE/UHMWPE reactor blends (a), produced by multi-site catalysis,
affords polyethylene reinforced with in situ formed shish–kebab UHMWPE nanofibers (b, c) [192]
Polyolefin Nanocomposites and Hybrid Catalysts
297