Functionalization of polyethylene with silane comonomers

Abstract

We synthesized a new weakly interacting monomer with a reactive phenylsilane group that is an intermediate for many functional groups. The synthesis was performed in two steps: the hydrosilylation of 1,7‐octadiene with dimethylchlorosilane and a Grignard reaction with phenyl magnesium bromide. The new monomer, 7‐octenyldimethylphenylsilane, was isolated and copolymerized with ethylene via metallocene catalysts (Me2Si(Me‐2‐Ind)2ZrCl2 and Et(Ind)2ZrCl2) and methylaluminoxane (MAO) as a cocatalyst. Electropositive silicon had no negative effect on the copolymerization reaction. The polymerization activity increased, and the molar mass of the product remained at a high level. The comonomer incorporation reached a significant 11.8 wt % (2.6 mol %). © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1303–1308, 2002

Functionalization of polyethylene/silane copolymers in posttreatment reactions

“…7‐Octenyldimethylphenylsilane was isolated and the yield was 10.6 g (67%). 1 H and 13 C NMR data have been published previously 9…”

“…In our previous work,9 ethylene has been copolymerized with 7‐octenyldimethylphenylsilane without loss of catalyst activity, yielding high molar mass polymers having comonomer concentrations up to 2.6 mol %. In the present study, the same monomers were copolymerized, mainly according to the same procedure, giving a series of copolymers containing different comonomer amounts.…”

Ethylene/silane copolymers prepared with a metallocene catalyst as polymeric additives in polyethylene/aluminum trihydroxide composites

“…As a commercial additive, we used an ethylene/butyl acrylate copolymer (PE‐ co ‐BA; grade LE 6471, 7 wt % acrylate; Borealis Polymers). Other additives were metallocene catalyst produced ethylene/7‐octenyldimethylphenylsilane copolymers11 that were further posttreated into different halo‐ or alcoxysilane‐functional forms [(CH 3 ) 2 Si Ph → (CH 3 ) 2 Si Cl , (CH 3 ) 2 Si F , (CH 3 ) 2 Si OCH 3 , (CH 3 ) 2 Si OCH 2 CH 3 ] 12. Their properties are shown in Table 1.…”

Synthesis of polyethene–graft–polystyrene copolymers from linear polyethene-containing cyclopropane rings

“…Nevertheless, because of the general inability of a single initiator to polymerize both ethene and functional monomers, graft and block copolymers usually have been synthesized by postpolymerization processes, including free-radical initiator, living anionic and transition metal-catalyzed polymerizations. [2][3][4][5][6][7] As it has been reported in the literature, PEs containing controlled amounts of methylene-1,2-cyclopropane and methylene-1,2-cyclopentane units (hereafter called E-C3) can be obtained by the polymerization of ethene with 1,3-butadiene using rac-[CH 2 (3-tert-butyl-1-indenyl) 2 ]ZrCl 2 activated by methylalluminoxane as a catalyst. [8][9][10][11][12] These PEs are technologically relevant because the presence of reactive cyclopropane rings in the chains discloses the possibility to obtain polymers with different properties.…”