Synthesis of polyethylene-g-polystyrene and polyethylene-g-poly(p-methylstyrene) graft copolymers

T. C. Chung, H. L. Lu, R. D. Ding

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Abstract

This paper describes a new method to prepare polyethylene graft copolymers, such as polyethylene-g-polystyrene and polyethylene-g-poly(p-methylstyrene), with a relatively well-controlled reaction mechanism. The chemistry involves a transformation process from the metallocene copolymerization of ethylene and p-methylstyrene to the anionic living polymerization of styrene or p-methylstyrene. The metallocene catalysis produces poly(ethylene-co-p-methylstyrene) random copolymers with molecular weight distribution (M̄w/M̄n of about 2.5. The following selective metalation reaction of p-methylstyrene units in the copolymer and the subsequent anionic "living" graft-from polymerization were effective to produce polymeric side chains with well-defined structure. Both graft density and graft length can be controlled by p-methylstyrene content in the PE backbone, metalation reagent, and the quantity of monomer used in the graft-from reaction. In the bulk, the individual PE and PS segmente in the graft copolymers are phases-seperated to form crystalline PE domains and amorphous PS domains. The microscopy studies reveal the effectiveness of PE-g-PS in the polymer blends by reducing the phase sizes, improving the dispersion, and increasing interfacial interaction between domains.

Original languageEnglish (US)
Pages (from-to)1272-1278
Number of pages7
JournalMacromolecules
Volume30
Issue number5
DOIs
StatePublished - Mar 10 1997

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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