Preparation and characterization of polyisoprenes and polybutadienes having 1,2- and 3,4-linkages preferentially

Atsushi Takano, Takeshi Horaiya, Fumitake Odamaki, Yoshihiko Akazawa, Yutaka Ohta, Daisuke Kawaguchi, Yoshiaki Takahashi, Yushu Matsushita

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Polyisoprenes (PI) and polybutadienes (PB) both having vinyl-type side chains preferentially were prepared and characterized. Both polymers were anionically polymerized with cumyl potassium or pottassium naphthalenide as initiators in a polar solvent, tetrahydrofuran, at low temperature. From the 1H NMR measurement, the PI contains 3,4- and 1,2-microstructures and PB does 1,2-microstructure preferentially. All the samples covering the molecular weight range of 37 k ≤ Mw ≤ 724 k for PI and 35 k ≤ Mw ≤ 197 k for PB were confirmed to have narrow molecular weight distribution. Measured glass transition temperatures, i.e., 11.0 °C for PI and -0.7 °C for PB are both considerably high compared with those of 1,4-microstructure-rich analogues. Intrinsic viscosity measurements in 1,3-dioxane for PI and 2-octanol for PB were carried out, and the segment lengths of the 3,4-/1,2-rich PI and 1,2-rich PB were estimated to be 0.60 nm and 0.59 nm, which are both considerably shorter than the values for two polydienes having 1,4-microstructures preferentially, i.e., 0.66 nm for both 1,4-rich PI and PB. Furthermore plateau moduli of both polymers are determined by dynamic viscoelastic measurements.

Original languageEnglish
Pages (from-to)3354-3359
Number of pages6
Journalpolymer
Volume53
Issue number15
DOIs
Publication statusPublished - Jul 6 2012

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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