Journal
CHEMICAL ENGINEERING SCIENCE
Volume 62, Issue 3, Pages 899-905Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2006.10.005
Keywords
nanoscale SiO2; LLDPE; polymerization; metallocene; polymer composite
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Here, we revealed the effect of particle size of the nanoscale SiO2 on catalytic and characteristic properties of LLDPE/nano-SiO2 composites synthesized via the in situ polymerization with a zirconocene/MAO catalyst. In the experiment, SiO2 (10 and 15.nm) was first impregnated with MAO. Then, copolymerization of ethylene/l-hexene was performed in the presence of nano-SiO2/MAO to produce LLDPE/nano-SiO2 composites. It was found that the larger particle exhibited higher polymerization activity due to fewer interactions between SiO2 and MAO. The larger particle also rendered higher insertion of 1-hexene leading to decreased melting temperature (Tm). There was no significant change in the LLDPE molecular structure by means of C-13 NMR. (c) 2006 Elsevier Ltd. All rights reserved.
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