Degree of branching of highly branched polyurethanes synthesized via the Oligomeric A2 Plus B3 methodology

Ann R. Fornof, Thomas E. Glass, Timothy Edward Long

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The oligomeric A2 plus monomeric B3 synthetic methodology provided highly branched, poly(ether urethane)s based on IMP (B 3) and isocyanate endcapped polyethers. 13C NMR spectroscopic assignments for the branched polyurethanes were verified using model urethane-containing compounds based on TMP and a monofunctional isocyanate (either cyclohexyl or phenyl isocyanate (PI)). Derivatization of hydroxyl endgroups with trifluoroacetic anhydride enhanced the 13C NMR resolution in spectra for branched polyurethanes. The 13C NMR resonance for the linear unit exhibited a broad shoulder due to quaternary carbons that were attributed to cyclic species in the highly branched polyurethanes. The classical DB calculation revealed the efficiency of the 83 monomer for branching; however, an equation that incorporated the linear contribution of the A2 oligomer provided a more accurate DB for highly branched polyurethanes.

Original languageEnglish
Pages (from-to)1197-1206
Number of pages10
JournalMacromolecular Chemistry and Physics
Volume207
Issue number14
DOIs
Publication statusPublished - 2006 Jul 24
Externally publishedYes

Fingerprint

isocyanates
Polyurethanes
urethanes
methodology
Isocyanates
Explorer 21 satellite
nuclear magnetic resonance
trifluoroacetic anhydride
Urethane
Nuclear magnetic resonance
Thymidine Monophosphate
anhydrides
shoulders
oligomers
Inosine Monophosphate
Polyethers
ethers
monomers
Oligomers
Hydroxyl Radical

Keywords

  • C NMR spectroscopy
  • Degree of branching
  • Highly branched
  • Hyperbranched
  • Polyurethanes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Degree of branching of highly branched polyurethanes synthesized via the Oligomeric A2 Plus B3 methodology. / Fornof, Ann R.; Glass, Thomas E.; Long, Timothy Edward.

In: Macromolecular Chemistry and Physics, Vol. 207, No. 14, 24.07.2006, p. 1197-1206.

Research output: Contribution to journalArticle

Fornof, Ann R. ; Glass, Thomas E. ; Long, Timothy Edward. / Degree of branching of highly branched polyurethanes synthesized via the Oligomeric A2 Plus B3 methodology. In: Macromolecular Chemistry and Physics. 2006 ; Vol. 207, No. 14. pp. 1197-1206.
@article{40e8e6a116ef45cfa7b8ece5b9b3302b,
title = "Degree of branching of highly branched polyurethanes synthesized via the Oligomeric A2 Plus B3 methodology",
abstract = "The oligomeric A2 plus monomeric B3 synthetic methodology provided highly branched, poly(ether urethane)s based on IMP (B 3) and isocyanate endcapped polyethers. 13C NMR spectroscopic assignments for the branched polyurethanes were verified using model urethane-containing compounds based on TMP and a monofunctional isocyanate (either cyclohexyl or phenyl isocyanate (PI)). Derivatization of hydroxyl endgroups with trifluoroacetic anhydride enhanced the 13C NMR resolution in spectra for branched polyurethanes. The 13C NMR resonance for the linear unit exhibited a broad shoulder due to quaternary carbons that were attributed to cyclic species in the highly branched polyurethanes. The classical DB calculation revealed the efficiency of the 83 monomer for branching; however, an equation that incorporated the linear contribution of the A2 oligomer provided a more accurate DB for highly branched polyurethanes.",
keywords = "C NMR spectroscopy, Degree of branching, Highly branched, Hyperbranched, Polyurethanes",
author = "Fornof, {Ann R.} and Glass, {Thomas E.} and Long, {Timothy Edward}",
year = "2006",
month = "7",
day = "24",
doi = "10.1002/macp.200600096",
language = "English",
volume = "207",
pages = "1197--1206",
journal = "Macromolecular Chemistry and Physics",
issn = "1022-1352",
publisher = "Wiley-VCH Verlag",
number = "14",

}

TY - JOUR

T1 - Degree of branching of highly branched polyurethanes synthesized via the Oligomeric A2 Plus B3 methodology

AU - Fornof, Ann R.

AU - Glass, Thomas E.

AU - Long, Timothy Edward

PY - 2006/7/24

Y1 - 2006/7/24

N2 - The oligomeric A2 plus monomeric B3 synthetic methodology provided highly branched, poly(ether urethane)s based on IMP (B 3) and isocyanate endcapped polyethers. 13C NMR spectroscopic assignments for the branched polyurethanes were verified using model urethane-containing compounds based on TMP and a monofunctional isocyanate (either cyclohexyl or phenyl isocyanate (PI)). Derivatization of hydroxyl endgroups with trifluoroacetic anhydride enhanced the 13C NMR resolution in spectra for branched polyurethanes. The 13C NMR resonance for the linear unit exhibited a broad shoulder due to quaternary carbons that were attributed to cyclic species in the highly branched polyurethanes. The classical DB calculation revealed the efficiency of the 83 monomer for branching; however, an equation that incorporated the linear contribution of the A2 oligomer provided a more accurate DB for highly branched polyurethanes.

AB - The oligomeric A2 plus monomeric B3 synthetic methodology provided highly branched, poly(ether urethane)s based on IMP (B 3) and isocyanate endcapped polyethers. 13C NMR spectroscopic assignments for the branched polyurethanes were verified using model urethane-containing compounds based on TMP and a monofunctional isocyanate (either cyclohexyl or phenyl isocyanate (PI)). Derivatization of hydroxyl endgroups with trifluoroacetic anhydride enhanced the 13C NMR resolution in spectra for branched polyurethanes. The 13C NMR resonance for the linear unit exhibited a broad shoulder due to quaternary carbons that were attributed to cyclic species in the highly branched polyurethanes. The classical DB calculation revealed the efficiency of the 83 monomer for branching; however, an equation that incorporated the linear contribution of the A2 oligomer provided a more accurate DB for highly branched polyurethanes.

KW - C NMR spectroscopy

KW - Degree of branching

KW - Highly branched

KW - Hyperbranched

KW - Polyurethanes

UR - http://www.scopus.com/inward/record.url?scp=33747067705&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33747067705&partnerID=8YFLogxK

U2 - 10.1002/macp.200600096

DO - 10.1002/macp.200600096

M3 - Article

AN - SCOPUS:33747067705

VL - 207

SP - 1197

EP - 1206

JO - Macromolecular Chemistry and Physics

JF - Macromolecular Chemistry and Physics

SN - 1022-1352

IS - 14

ER -