Abstract
The segmental and local dynamics of amorphous blends of poly(methyl methacrylate) and polyethylene oxide) (PMMA/PEO) were investigated using dielectric relaxation spectroscopy. The derivative of the dielectric permittivity facilitates the observation of the cooperative segmental relaxation (α b) in blends with low PEO content, which is mostly masked in ∈″ spectra. For blends aged at room temperature, a DSC endotherm gradually develops near the expected PEO T m and shifts to higher temperatures with increasing aging time. However, X-ray diffraction from PEO crystals is not observed, indicating that the glassy blends undergo physical aging at room temperature. A relaxation appears in the blends between the PMMA and PEO local relaxations, which we propose is associated with regions of PEO partial order.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 8110-8115 |
| Number of pages | 6 |
| Journal | Macromolecules |
| Volume | 37 |
| Issue number | 21 |
| DOIs | |
| State | Published - Oct 19 2004 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
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Broadband dielectric investigation of amorphous poly(methyl methacrylate)/poly(ethylene oxide) blends. / Jin, Xing; Zhang, Shihai; Runt, James Patrick.
In: Macromolecules, Vol. 37, No. 21, 19.10.2004, p. 8110-8115.Research output: Contribution to journal › Article
TY - JOUR
T1 - Broadband dielectric investigation of amorphous poly(methyl methacrylate)/poly(ethylene oxide) blends
AU - Jin, Xing
AU - Zhang, Shihai
AU - Runt, James Patrick
PY - 2004/10/19
Y1 - 2004/10/19
N2 - The segmental and local dynamics of amorphous blends of poly(methyl methacrylate) and polyethylene oxide) (PMMA/PEO) were investigated using dielectric relaxation spectroscopy. The derivative of the dielectric permittivity facilitates the observation of the cooperative segmental relaxation (α b) in blends with low PEO content, which is mostly masked in ∈″ spectra. For blends aged at room temperature, a DSC endotherm gradually develops near the expected PEO T m and shifts to higher temperatures with increasing aging time. However, X-ray diffraction from PEO crystals is not observed, indicating that the glassy blends undergo physical aging at room temperature. A relaxation appears in the blends between the PMMA and PEO local relaxations, which we propose is associated with regions of PEO partial order.
AB - The segmental and local dynamics of amorphous blends of poly(methyl methacrylate) and polyethylene oxide) (PMMA/PEO) were investigated using dielectric relaxation spectroscopy. The derivative of the dielectric permittivity facilitates the observation of the cooperative segmental relaxation (α b) in blends with low PEO content, which is mostly masked in ∈″ spectra. For blends aged at room temperature, a DSC endotherm gradually develops near the expected PEO T m and shifts to higher temperatures with increasing aging time. However, X-ray diffraction from PEO crystals is not observed, indicating that the glassy blends undergo physical aging at room temperature. A relaxation appears in the blends between the PMMA and PEO local relaxations, which we propose is associated with regions of PEO partial order.
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U2 - 10.1021/ma049281b
DO - 10.1021/ma049281b
M3 - Article
AN - SCOPUS:7644243070
VL - 37
SP - 8110
EP - 8115
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 21
ER -