Microstructure and dynamics of semicrystalline poly(ethylene oxide)-poly(vinyl acetate) blends

Daniel Fragiadakis, James Patrick Runt

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The microstructure and dynamics of semicrystalline, melt-miscible polyethylene oxide)/ polyvinyl acetate) (PEO/PVAc) blends were investigated using small-angle X-ray scattering (SAXS) and broadband dielectric relaxation spectroscopy, respectively. PEO/PVAc blends with selected compositions were crystallized, and SAXS was used to determine the location of the noncrystallizable PVAc in the structure. Values of the microstructural parameters indicate that little, if any, PVAc is incorporated into interlamellar regions under these crystallization conditions, but PVAc diffuses to interfibrillar regions during the crystallization process. For crystalline blends, a dielectric relaxation appears in the same location as the neat PEO a-process, indicating the presence of relatively mobile amorphous segments consisting almost entirely of PEO, in blends with compositions having as much as 50% PVAc. Considering the findings from the SAXS experiments, we attribute αPEO in the blends to the segmental process of the mobile portion of the interlamellar PEO segments. The shape of an observed higher temperature dielectric relaxation, particularly for blends with 30% and 50% PVAc content, suggests that it consists of multiple overlapping processes. The evidence suggests that these are a Maxwell-Wagner-Sillars (MWS) interfacial polarization process (similar to the one observed for neat PEO), a slow segmental process associated with amorphous interfibrillar regions, and possibly a second MWS relaxation.

Original languageEnglish (US)
Pages (from-to)1028-1034
Number of pages7
JournalMacromolecules
Volume43
Issue number2
DOIs
StatePublished - Jan 26 2010

Fingerprint

Polyethylene oxides
Dielectric relaxation
Microstructure
X ray scattering
Crystallization
Polyvinyl acetates
Chemical analysis
vinyl acetate
Spectroscopy
Polarization
Crystalline materials
Experiments
Temperature
polyvinyl acetate

All Science Journal Classification (ASJC) codes

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

Cite this

Fragiadakis, Daniel ; Runt, James Patrick. / Microstructure and dynamics of semicrystalline poly(ethylene oxide)-poly(vinyl acetate) blends. In: Macromolecules. 2010 ; Vol. 43, No. 2. pp. 1028-1034.
@article{f3770399a46345f4bda1208ba8455184,
title = "Microstructure and dynamics of semicrystalline poly(ethylene oxide)-poly(vinyl acetate) blends",
abstract = "The microstructure and dynamics of semicrystalline, melt-miscible polyethylene oxide)/ polyvinyl acetate) (PEO/PVAc) blends were investigated using small-angle X-ray scattering (SAXS) and broadband dielectric relaxation spectroscopy, respectively. PEO/PVAc blends with selected compositions were crystallized, and SAXS was used to determine the location of the noncrystallizable PVAc in the structure. Values of the microstructural parameters indicate that little, if any, PVAc is incorporated into interlamellar regions under these crystallization conditions, but PVAc diffuses to interfibrillar regions during the crystallization process. For crystalline blends, a dielectric relaxation appears in the same location as the neat PEO a-process, indicating the presence of relatively mobile amorphous segments consisting almost entirely of PEO, in blends with compositions having as much as 50{\%} PVAc. Considering the findings from the SAXS experiments, we attribute αPEO in the blends to the segmental process of the mobile portion of the interlamellar PEO segments. The shape of an observed higher temperature dielectric relaxation, particularly for blends with 30{\%} and 50{\%} PVAc content, suggests that it consists of multiple overlapping processes. The evidence suggests that these are a Maxwell-Wagner-Sillars (MWS) interfacial polarization process (similar to the one observed for neat PEO), a slow segmental process associated with amorphous interfibrillar regions, and possibly a second MWS relaxation.",
author = "Daniel Fragiadakis and Runt, {James Patrick}",
year = "2010",
month = "1",
day = "26",
doi = "10.1021/ma9020938",
language = "English (US)",
volume = "43",
pages = "1028--1034",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "2",

}

Microstructure and dynamics of semicrystalline poly(ethylene oxide)-poly(vinyl acetate) blends. / Fragiadakis, Daniel; Runt, James Patrick.

In: Macromolecules, Vol. 43, No. 2, 26.01.2010, p. 1028-1034.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure and dynamics of semicrystalline poly(ethylene oxide)-poly(vinyl acetate) blends

AU - Fragiadakis, Daniel

AU - Runt, James Patrick

PY - 2010/1/26

Y1 - 2010/1/26

N2 - The microstructure and dynamics of semicrystalline, melt-miscible polyethylene oxide)/ polyvinyl acetate) (PEO/PVAc) blends were investigated using small-angle X-ray scattering (SAXS) and broadband dielectric relaxation spectroscopy, respectively. PEO/PVAc blends with selected compositions were crystallized, and SAXS was used to determine the location of the noncrystallizable PVAc in the structure. Values of the microstructural parameters indicate that little, if any, PVAc is incorporated into interlamellar regions under these crystallization conditions, but PVAc diffuses to interfibrillar regions during the crystallization process. For crystalline blends, a dielectric relaxation appears in the same location as the neat PEO a-process, indicating the presence of relatively mobile amorphous segments consisting almost entirely of PEO, in blends with compositions having as much as 50% PVAc. Considering the findings from the SAXS experiments, we attribute αPEO in the blends to the segmental process of the mobile portion of the interlamellar PEO segments. The shape of an observed higher temperature dielectric relaxation, particularly for blends with 30% and 50% PVAc content, suggests that it consists of multiple overlapping processes. The evidence suggests that these are a Maxwell-Wagner-Sillars (MWS) interfacial polarization process (similar to the one observed for neat PEO), a slow segmental process associated with amorphous interfibrillar regions, and possibly a second MWS relaxation.

AB - The microstructure and dynamics of semicrystalline, melt-miscible polyethylene oxide)/ polyvinyl acetate) (PEO/PVAc) blends were investigated using small-angle X-ray scattering (SAXS) and broadband dielectric relaxation spectroscopy, respectively. PEO/PVAc blends with selected compositions were crystallized, and SAXS was used to determine the location of the noncrystallizable PVAc in the structure. Values of the microstructural parameters indicate that little, if any, PVAc is incorporated into interlamellar regions under these crystallization conditions, but PVAc diffuses to interfibrillar regions during the crystallization process. For crystalline blends, a dielectric relaxation appears in the same location as the neat PEO a-process, indicating the presence of relatively mobile amorphous segments consisting almost entirely of PEO, in blends with compositions having as much as 50% PVAc. Considering the findings from the SAXS experiments, we attribute αPEO in the blends to the segmental process of the mobile portion of the interlamellar PEO segments. The shape of an observed higher temperature dielectric relaxation, particularly for blends with 30% and 50% PVAc content, suggests that it consists of multiple overlapping processes. The evidence suggests that these are a Maxwell-Wagner-Sillars (MWS) interfacial polarization process (similar to the one observed for neat PEO), a slow segmental process associated with amorphous interfibrillar regions, and possibly a second MWS relaxation.

UR - http://www.scopus.com/inward/record.url?scp=74849130213&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=74849130213&partnerID=8YFLogxK

U2 - 10.1021/ma9020938

DO - 10.1021/ma9020938

M3 - Article

VL - 43

SP - 1028

EP - 1034

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 2

ER -