Peculiar glass transition behavior and miscibility in a binary mixture comprising amorphous poly(ether imide) with semicrystalline poly(butylene terephthalate)

Eamor Woo, S. N. Yau

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39 Citations (Scopus)

Abstract

Miscibility and an asymmetric Tg-composition relationship have been demonstrated in the binary blends composed of amorphous pol(ether imide) (PEI) and semicrystalline poly(butylene terephthalate) (PBT). The peculiar Tg-composition behavior in the miscible PEI/PBT blends was analyzed using a free-volume approach, where uneven contributions to the mixtures free volumes were attributed to the vastly different crystallizing tendency of one constituent versus the other. A single Tg was observed in the PEI/PBT blends using differential scanning calorimetry (DSC) as well as dynamic mechanical analysis (DMA), which proved single relaxation and intimate mixing between these two components at the molecular scales. Additionally, homogeneous phase morphology in the blends was also substantiated using optical and scanning electron microscopy. Interactions between the polymers were investigated by analyzing the equilibrium melting point depression as well as the Tg dependence on composition.

Original languageEnglish
Pages (from-to)3626-3631
Number of pages6
JournalMacromolecules
Volume30
Issue number12
DOIs
Publication statusPublished - 1997 Jun 16

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Imides
Polyetherimides
Binary mixtures
Ether
Glass transition
Ethers
Solubility
Free volume
Chemical analysis
Dynamic mechanical analysis
Melting point
Differential scanning calorimetry
Polymers
Scanning electron microscopy
terephthalic acid
butylene

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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N2 - Miscibility and an asymmetric Tg-composition relationship have been demonstrated in the binary blends composed of amorphous pol(ether imide) (PEI) and semicrystalline poly(butylene terephthalate) (PBT). The peculiar Tg-composition behavior in the miscible PEI/PBT blends was analyzed using a free-volume approach, where uneven contributions to the mixtures free volumes were attributed to the vastly different crystallizing tendency of one constituent versus the other. A single Tg was observed in the PEI/PBT blends using differential scanning calorimetry (DSC) as well as dynamic mechanical analysis (DMA), which proved single relaxation and intimate mixing between these two components at the molecular scales. Additionally, homogeneous phase morphology in the blends was also substantiated using optical and scanning electron microscopy. Interactions between the polymers were investigated by analyzing the equilibrium melting point depression as well as the Tg dependence on composition.

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