Synthesis and Characterization of Poly(ethylene glycol) Methyl Ether Endcapped Poly(ethylene terephthalate)

Qin Lin, Serkan Unal, Ann R. Fornof, Yuping Wei, Huimin Li, R. Scott Armentrout, Timothy Edward Long*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Linear and branched poly(ethylene terephthalate) (PET) copolymers with poly(ethylene glycol) (PEG) methyl ether (700 or 2000 g/mol) end groups were synthesized using conventional melt polymerization. DSC analysis demonstrated that low levels of PEG end groups accelerated PET crystallization. The incorporated PEG end groups also decreased the crystallization temperature of PET dramatically, and copolymers with a high content of PEG (>17.6 wt%) were able to crystallize at room temperature. Rheological analysis demonstrated that the presence of PEG end groups effectively decreased the melt viscosities and facilitated melt processing. XPS and ATR-FTIR revealed that the PEG end groups tended to aggregate on the surface, and the surface of compression molded films containing 34.0 wt% PEG were PEG rich (85 wt% PEG). PEG end-capped PET (34.0 wt% PEG) and PET films were immersed into a fibrinogen solution (0.7 mg/mL BSA) for 72 h to investigate the propensity for protein adhesion. XPS demonstrated that the concentration of nitrogen (1.05 %) on the surface of PEG endcapped PET film was statistically lower than PET (7.67%). SEM analysis was consistent with XPS results, and revealed the presence of adsorbed protein on the surface of PET films.

Original languageEnglish
Pages (from-to)163-172
Number of pages10
JournalMacromolecular Symposia
Publication statusPublished - 2003 Sept 1
Externally publishedYes


  • Biocompatibility
  • Crystallization rate
  • Melt polymerization
  • Poly(ethylene glycol) (PEG)
  • Poly(ethylene terephthalate) (PET)

ASJC Scopus subject areas

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


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