Tailoring the degree of branching: Preparation of poly(ether ester)s via copolymerization of poly(ethylene glycol) oligomers (A 2) and 1,3,5-benzenetricarbonyl trichloride (B 3)

Serkan Unal, Qin Lin, Thomas H. Mourey, Timothy Edward Long

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A novel approach to tailor the degree of branching of poly(ether ester)s was developed based on the copolymerization of oligomeric A 2 and B 3 monomers. A dilute solution of polyethylene glycol) (PEG) (A 2) was added slowly to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B 3) at room temperature in the presence of triethylamine to prepare high molar mass gel-free products. PEG diols of various molar masses permitted the control of the degree of branching and an investigation of the effect of the distance between branch points. 1H NMR spectroscopy indicated a classical degree of branching (DB) of 69% for a highly branched poly(ether ester) derived from 200 g/mol PEG diol. A revised definition of the degree of branching was proposed to accurately describe the branched poly(ether ester)s, and the degree of branching decreased as the molar mass of the PEG diole was increased. The effects of branching and the length of the PEG segments on the thermal properties of the highly branched polymers were investigated using differential scanning calorimetry (DSC). Amorphous branched poly(ether ester)s were obtained using PEG diols with number-average molar masses of either 200 or 600 g/mol. In-situ functionalization of the terminal acyl halide units with 2-hydroxylethyl acrylate provided novel photocross-linkable precursors.

Original languageEnglish
Pages (from-to)3246-3254
Number of pages9
JournalMacromolecules
Volume38
Issue number8
DOIs
Publication statusPublished - 2005 Apr 19
Externally publishedYes

Fingerprint

Oligomers
Ether
Copolymerization
Polyethylene glycols
Ethers
Esters
Molar mass
Nuclear magnetic resonance spectroscopy
1,3,5-benzene-tricarbonyl trichloride
Differential scanning calorimetry
Polymers
Thermodynamic properties
Monomers
Gels
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Tailoring the degree of branching : Preparation of poly(ether ester)s via copolymerization of poly(ethylene glycol) oligomers (A 2) and 1,3,5-benzenetricarbonyl trichloride (B 3). / Unal, Serkan; Lin, Qin; Mourey, Thomas H.; Long, Timothy Edward.

In: Macromolecules, Vol. 38, No. 8, 19.04.2005, p. 3246-3254.

Research output: Contribution to journalArticle

@article{55ac27bbeb4544e0a40c52c1acba6cd3,
title = "Tailoring the degree of branching: Preparation of poly(ether ester)s via copolymerization of poly(ethylene glycol) oligomers (A 2) and 1,3,5-benzenetricarbonyl trichloride (B 3)",
abstract = "A novel approach to tailor the degree of branching of poly(ether ester)s was developed based on the copolymerization of oligomeric A 2 and B 3 monomers. A dilute solution of polyethylene glycol) (PEG) (A 2) was added slowly to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B 3) at room temperature in the presence of triethylamine to prepare high molar mass gel-free products. PEG diols of various molar masses permitted the control of the degree of branching and an investigation of the effect of the distance between branch points. 1H NMR spectroscopy indicated a classical degree of branching (DB) of 69{\%} for a highly branched poly(ether ester) derived from 200 g/mol PEG diol. A revised definition of the degree of branching was proposed to accurately describe the branched poly(ether ester)s, and the degree of branching decreased as the molar mass of the PEG diole was increased. The effects of branching and the length of the PEG segments on the thermal properties of the highly branched polymers were investigated using differential scanning calorimetry (DSC). Amorphous branched poly(ether ester)s were obtained using PEG diols with number-average molar masses of either 200 or 600 g/mol. In-situ functionalization of the terminal acyl halide units with 2-hydroxylethyl acrylate provided novel photocross-linkable precursors.",
author = "Serkan Unal and Qin Lin and Mourey, {Thomas H.} and Long, {Timothy Edward}",
year = "2005",
month = "4",
day = "19",
doi = "10.1021/ma047534v",
language = "English",
volume = "38",
pages = "3246--3254",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "8",

}

TY - JOUR

T1 - Tailoring the degree of branching

T2 - Preparation of poly(ether ester)s via copolymerization of poly(ethylene glycol) oligomers (A 2) and 1,3,5-benzenetricarbonyl trichloride (B 3)

AU - Unal, Serkan

AU - Lin, Qin

AU - Mourey, Thomas H.

AU - Long, Timothy Edward

PY - 2005/4/19

Y1 - 2005/4/19

N2 - A novel approach to tailor the degree of branching of poly(ether ester)s was developed based on the copolymerization of oligomeric A 2 and B 3 monomers. A dilute solution of polyethylene glycol) (PEG) (A 2) was added slowly to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B 3) at room temperature in the presence of triethylamine to prepare high molar mass gel-free products. PEG diols of various molar masses permitted the control of the degree of branching and an investigation of the effect of the distance between branch points. 1H NMR spectroscopy indicated a classical degree of branching (DB) of 69% for a highly branched poly(ether ester) derived from 200 g/mol PEG diol. A revised definition of the degree of branching was proposed to accurately describe the branched poly(ether ester)s, and the degree of branching decreased as the molar mass of the PEG diole was increased. The effects of branching and the length of the PEG segments on the thermal properties of the highly branched polymers were investigated using differential scanning calorimetry (DSC). Amorphous branched poly(ether ester)s were obtained using PEG diols with number-average molar masses of either 200 or 600 g/mol. In-situ functionalization of the terminal acyl halide units with 2-hydroxylethyl acrylate provided novel photocross-linkable precursors.

AB - A novel approach to tailor the degree of branching of poly(ether ester)s was developed based on the copolymerization of oligomeric A 2 and B 3 monomers. A dilute solution of polyethylene glycol) (PEG) (A 2) was added slowly to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B 3) at room temperature in the presence of triethylamine to prepare high molar mass gel-free products. PEG diols of various molar masses permitted the control of the degree of branching and an investigation of the effect of the distance between branch points. 1H NMR spectroscopy indicated a classical degree of branching (DB) of 69% for a highly branched poly(ether ester) derived from 200 g/mol PEG diol. A revised definition of the degree of branching was proposed to accurately describe the branched poly(ether ester)s, and the degree of branching decreased as the molar mass of the PEG diole was increased. The effects of branching and the length of the PEG segments on the thermal properties of the highly branched polymers were investigated using differential scanning calorimetry (DSC). Amorphous branched poly(ether ester)s were obtained using PEG diols with number-average molar masses of either 200 or 600 g/mol. In-situ functionalization of the terminal acyl halide units with 2-hydroxylethyl acrylate provided novel photocross-linkable precursors.

UR - http://www.scopus.com/inward/record.url?scp=17444376818&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17444376818&partnerID=8YFLogxK

U2 - 10.1021/ma047534v

DO - 10.1021/ma047534v

M3 - Article

AN - SCOPUS:17444376818

VL - 38

SP - 3246

EP - 3254

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 8

ER -