02356nas a2200253   4500008004100000022001400041245017200055210006900227260006800296300001200364490000700376520143100383653000901814653002701823653001901850653002201869653000801891653000901899100001101908700001501919700002401934700001501958856012901973       2005                        eng d  a0887-624X00aIn situ polymerization of ethylene with bis(imino)pyridine iron(II) catalysts supported on clay: the synthesis and characterization of polyethylene-clay nanocomposites0 aIn situ polymerization of ethylene with bisiminopyridine ironII   a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJAN  a304-3180 v433 a<p>Polyethylene-clay nanocomposites were synthesized by in situ polymerization with 2,6-bis[1-(2,6-diisopropylphenylimino)ethyl] pyridine iron(II) dichloride supported on a modified montmorillonite clay pretreated with methylaluminoxane (MAO). The catalysts and the obtained nanocomposites were examined with wide-angle X-ray scattering. The exfoliation of the clay was further established by transmission electron microscopy. Upon the treatment of the clay with MAO, there was an increase in the d-spacing of the clay galleries. No further increase in the d-spacing of the galleries was observed with the iron catalyst supported on the MAO-treated clay. The catalyst activity for ethylene polymerization was independent of the Al/Fe ratio. The exfoliation of the clay inside the polymer matrix depended on various parameters, such as the clay content, catalyst content, and Al/Fe ratio. The crystallinity percentage and crystallite size of the nanocomposites were affected by the degree of exfoliation of the clay. Moreover, when ethylene was polymerized with a mixture of the homogeneous iron(II) catalyst and clay, the degree of exfoliation was significantly lower than when the polymerization was performed with a preformed clay-supported catalyst. This observation suggested that in the supported catalyst, at least some of the active centers resided within the galleries of the clay. (C) 2004 Wiley Periodicals, Inc.</p>10aclay10aIn situ polymerization10aNanocomposites10apolyethylene (PE)10aTEM10aWAXS1 aRay, S1 aGalgali, G1 aLele, Arundhati, C.1 aSivaram, S  uhttps://library.ncl.res.in/content/situ-polymerization-ethylene-bisiminopyridine-ironii-catalysts-supported-clay-synthesis-1