Synthesis and characterization of telechelic poly(ethylene terephthalate) sodiosulfonate ionomers

Huaiying Kang, Qin Lin, R. Scott Armentrout, Timothy Edward Long

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Poly(ethylene terephthalate) (PET) ionomers containing terminal units derived from 3-sulfobenzoic acid, sodium salt (SSBA), were synthesized using metal-catalyzed melt polymerization techniques. SSBA (1.0-5.0 mol%) in the presence of sodium acetate (10 mol % compared to SSBA) served as an ideal chain-end functionalization reagent, and molecular weights (ηinh = 0.28-0.80) were reproducibly obtained at various SSBA levels. 1H NMR spectroscopy quantified the presence of the sodiosulfonate end groups and the formation of diethylene glycol. For comparative purposes, polyesters containing telechelic alkyl ester end groups derived from dodecanol were also synthesized at nearly equivalent molecular weights in order to fundamentally understand the role of ionic end groups on rheological and thermal performance. Differential scanning calorimetry indicated that the presence of ionic end groups significantly increased the crystallization half-time. A comparison of the crystallization half-time for telechelic ionomers vs non-ionomers demonstrated that ionic aggregation exerted a more profound effect in the diffusion-controlled regime (lower than 150°C). Melt rheology confirmed that the ionic end groups increased the melt viscosity compared to non-ionomers at equivalent molecular weights. Moreover, ionomers and non-ionomers with nearly equivalent molecular weights exhibited similar slopes in log(melt viscosity) vs temperature curves, which is consistent with crystallization data. Melt viscosity vs temperature studies for telechelic ionomers also suggests that ionic aggregation was more stable below 150°C compared to high molecular weight non-ionomer analogues.

Original languageEnglish
Pages (from-to)8738-8744
Number of pages7
JournalMacromolecules
Volume35
Issue number23
DOIs
Publication statusPublished - 2002 Nov 5
Externally publishedYes

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Polyethylene Terephthalates
Ionomers
Polyethylene terephthalates
Molecular weight
Crystallization
Viscosity
Dodecanol
Agglomeration
Sodium
Sodium Acetate
Polyesters
Glycols
Rheology
Nuclear magnetic resonance spectroscopy
Differential scanning calorimetry
Esters
Salts
Metals
Polymerization
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Synthesis and characterization of telechelic poly(ethylene terephthalate) sodiosulfonate ionomers. / Kang, Huaiying; Lin, Qin; Armentrout, R. Scott; Long, Timothy Edward.

In: Macromolecules, Vol. 35, No. 23, 05.11.2002, p. 8738-8744.

Research output: Contribution to journalArticle

Kang, Huaiying ; Lin, Qin ; Armentrout, R. Scott ; Long, Timothy Edward. / Synthesis and characterization of telechelic poly(ethylene terephthalate) sodiosulfonate ionomers. In: Macromolecules. 2002 ; Vol. 35, No. 23. pp. 8738-8744.
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