Conformational Characteristics of Some Model Polydienes and Polyolefins

Paul Hattam, Stephen Gauntlett, Jimmy W. Mays, Nikolaos Hadjichristidis, Ronald N. Young, Lewis J. Fetters*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

The conformational behavior of model polydienes and their saturated polyolefinic analogues has been studied. The polymers were based on 1,3-butadiene, 2,3-dimethylbutadiene, 2-ethyl-1,3-butadiene, and 3-methylene-7-methyl-1,6-octadiene (β-myrcene). The unperturbed chain dimensions of these near-monodisperse polymers were evaluated under θ or near-θ conditions via intrinsic viscosity measurements. Consequently, information was obtained regarding the influence of side-chain length on chain dimensions as well as the influence of head-to-head structures in polypropylene. The temperature coefficient (d In 〈R20/dT) for chain dimensions of alternating poly(ethylene-butene) was determined. Its value of −0.9 × 10−3 K−1 is in consonance with the values for polyethylene and alternating poly(ethylene-propylene). The temperature coefficients for poly(vinylethylene), a butene-rich poly(ethylene-butene) material, and poly-(ethylethylene) were also measured. The value for the latter polymer is notably larger (−2.3 × 10−3 K−1) than that predicted (−0.1 × 10−3 K−1) from the five-state rotational isomeric state model. A value of −1.7 × 10−3 K−1 was measured for poly(vinylethylene), while −1.4 × 10−3 K−1 was found for a butene-rich poly(ethylene-butene) copolymer (40 ethyl branches per 100 backbone carbons).

Original languageEnglish (US)
Pages (from-to)6199-6209
Number of pages11
JournalMacromolecules
Volume24
Issue number23
DOIs
StatePublished - Nov 1 1991

ASJC Scopus subject areas

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

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