ISSN:
0959-8103
Schlagwort(e):
polyethylene
;
functionalization
;
borane reagent
;
metallocene catalyst
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
A new method to prepare functionalized polyethylene involving borane intermediates and transition metal catalysts is described. Two processes, direct and post polymerizations, were employed to prepare borane-containing polyethylene (PE-B), which can be transformed to functionalized polyethylene (LLDPE-f) with various functional groups, such as —BR2, —OH, —NH2, —OSi(CH3)3. In the direct process, the PE-B copolymers were prepared in one step by copolymerization of ethylene with a borane monomer (ω-borane-α-olefin). The post polymerization process requires two steps: copolymerization of ethylene and 1,4-hexadiene, and subsequential hydroboration reaction of unsaturated PE. Three transition metal catalysts, including two homogeneous metallocene (Cp2ZrCl2 [bis(cyclopentadienyl) zirconium dichloride] and Et(Ind)2ZrCl2 [1,1′-ethylenedi-η5-indenyl-zirconium dichloride] with MAO (methylaluminoxane)) and one heterogeneous (TiCl3·AA/Et2AlCl) ones, were studied in the copolymerization reactions. The single site Et(Ind)2ZrCl2/MAO homogeneous catalyst, with a strained ligand geometry and opened active site, is by far the most effective system in the incorporation of high olefins into polyethylene structures.
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pi.1995.210370308
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