Synthesis of new polyolefin elastomers, poly(ethylene-ter-propylene-ter-p-methylstyrene) and poly(ethylene-ter-1-octene-ter-p-methylstyrene), using metallocene catalysts with constrained ligand geometry

H. L. Lu, S. Hong, T. C. Chung

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Abstract

This paper discusses two new polyolefin elastomers, i.e., poly(ethylene-ter-propylene-ter-p-methylstyrene) (EP-p-MS) and poly(ethylene-ter-1-octene-ter-p-methylstyrene) (EO-p-MS), containing "reactive" p-methylstyrene (p-MS) groups. Both terpolymers, with a broad range of terpolymer composition, high molecular weight, narrow molecular weight, and composition distributions, have been prepared by using [C5Me4(SiMe2NtBu)]TiCl2 metallocene catalyst with constrained ligand geometry. Differential scanning calorimetry (DSC) results show no detectable melting point (Tm) in both terpolymers containing less than 70 mol % ethylene units. The sharp glass transition temperature (Tg) with flat base line in each DSC curve indicates homogeneous terpolymer microstructures. In general, the Tg of EP-p-MS is very sensitive to the terpolymer composition (ethylene/propylene ratio and p-MS content). In the compositions with the ideal ethylene/propylene ratio ∼ 55/45, Tg, is almost proportional to the content of p-MS. Only with the concentration of p-MS < 2 mol % does the EP-p-MS show a low Tg < -45 °C. On the other hand, the EO-p-MS system exhibits a low Tg < -50 °C in a wide range of copolymer compositions, even ones with relatively high p-MS contents (>7 mol %).

Original languageEnglish (US)
Pages (from-to)2028-2034
Number of pages7
JournalMacromolecules
Volume31
Issue number7
DOIs
StatePublished - Apr 7 1998

All Science Journal Classification (ASJC) codes

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

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