Investigations of thermal polymerization in the stable free-radical polymerization of 2-vinylnaphthalene

Jeremy R. Lizotte, Brian M. Erwin, Ralph H. Colby, Timothy Edward Long

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The feasibility of utilizing stable free-radical polymerization (SFRP) in the synthesis of well-defined poly(2-vinylnaphthalene) homopolymers has been investigated. Efforts to control molecular weight by manipulating initiator concentration while maintaining a 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO):benzoyl peroxide (BPO) molar ratio of 1.2:1 proved unsuccessful. In addition, systematic variations of the TEMPO: BPO molar ratio did not result in narrow molecular weight distributions. In situ Fourier transform infrared spectroscopy (FTIR) indicated that the rate of monomer disappearance under SFRP and thermal conditions were identical. This observation indicated a lack of control in the presence of the stable free radical, TEMPO. The similarities in chemical structure between styrene and 2-vinylnaphthalene suggested thermally initiated polymerization occurred via the Mayo mechanism. A kinetic analysis of the thermal polymerization of styrene and 2-vinylnaphthalene suggested that the additional fused ring in 2-vinylnaphthalene increased the propensity for thermal polymerization. The observed rate constant for thermal polymerization of 2-vinylnaphthalene was determined using in situ FTIR spectroscopy and was one order of magnitude greater than styrene, assuming pseudo-first-order kinetics. Also, an Arrhenius analysis indicated that the activation energy for the thermal polymerization of 2-vinylnaphthalene was 30 kJ/mol less than styrene.

Original languageEnglish
Pages (from-to)583-590
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume40
Issue number4
DOIs
Publication statusPublished - 2002 Feb 15
Externally publishedYes

Fingerprint

Free radical polymerization
Styrene
Polymerization
Benzoyl Peroxide
Benzoyl peroxide
Fourier transform infrared spectroscopy
Kinetics
Molecular weight distribution
Homopolymerization
Free radicals
Free Radicals
Rate constants
Activation energy
Monomers
Molecular weight
Hot Temperature
Spectroscopy

Keywords

  • Activation energy
  • FTIR
  • Radical polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Investigations of thermal polymerization in the stable free-radical polymerization of 2-vinylnaphthalene. / Lizotte, Jeremy R.; Erwin, Brian M.; Colby, Ralph H.; Long, Timothy Edward.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 40, No. 4, 15.02.2002, p. 583-590.

Research output: Contribution to journalArticle

Lizotte, Jeremy R. ; Erwin, Brian M. ; Colby, Ralph H. ; Long, Timothy Edward. / Investigations of thermal polymerization in the stable free-radical polymerization of 2-vinylnaphthalene. In: Journal of Polymer Science, Part A: Polymer Chemistry. 2002 ; Vol. 40, No. 4. pp. 583-590.
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