Pressure-dependent photon correlation spectroscopic investigation of poly(propylene oxide) near the glass transition

Steven W. Smith; Benny D. Freeman; Carol K. Hall

doi:10.1021/ma960408+

Pressure-dependent photon correlation spectroscopic investigation of poly(propylene oxide) near the glass transition

Steven W. Smith, Benny D. Freeman, Carol K. Hall

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23 Citations (Scopus)

Abstract

The effect of pressure on structural relaxations in poly(propylene oxide) (PPO; MW = 4000) near the glass transition has been determined using photon correlation spectroscopy. Experimental results are reported for pressures ranging from 2.5 to 3.9 kbar at 253 K. The structural relaxation exhibits two distinct processes separated by ∼3 orders of magnitude in time. This observation is consistent with results of dielectric relaxation studies of PPO. The faster relaxation is associated with local segmental motions important in the glass-rubber transition. The mean relaxation time for the faster process exhibits an exponential dependence on pressure.

Original language	English
Pages (from-to)	2052-2057
Number of pages	6
Journal	Macromolecules
Volume	30
Issue number	7
DOIs	https://doi.org/10.1021/ma960408+
Publication status	Published - 7 Apr 1997
Externally published	Yes

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10.1021/ma960408+

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abstract = "The effect of pressure on structural relaxations in poly(propylene oxide) (PPO; MW = 4000) near the glass transition has been determined using photon correlation spectroscopy. Experimental results are reported for pressures ranging from 2.5 to 3.9 kbar at 253 K. The structural relaxation exhibits two distinct processes separated by ∼3 orders of magnitude in time. This observation is consistent with results of dielectric relaxation studies of PPO. The faster relaxation is associated with local segmental motions important in the glass-rubber transition. The mean relaxation time for the faster process exhibits an exponential dependence on pressure.",

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AU - Hall, Carol K.

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N2 - The effect of pressure on structural relaxations in poly(propylene oxide) (PPO; MW = 4000) near the glass transition has been determined using photon correlation spectroscopy. Experimental results are reported for pressures ranging from 2.5 to 3.9 kbar at 253 K. The structural relaxation exhibits two distinct processes separated by ∼3 orders of magnitude in time. This observation is consistent with results of dielectric relaxation studies of PPO. The faster relaxation is associated with local segmental motions important in the glass-rubber transition. The mean relaxation time for the faster process exhibits an exponential dependence on pressure.

AB - The effect of pressure on structural relaxations in poly(propylene oxide) (PPO; MW = 4000) near the glass transition has been determined using photon correlation spectroscopy. Experimental results are reported for pressures ranging from 2.5 to 3.9 kbar at 253 K. The structural relaxation exhibits two distinct processes separated by ∼3 orders of magnitude in time. This observation is consistent with results of dielectric relaxation studies of PPO. The faster relaxation is associated with local segmental motions important in the glass-rubber transition. The mean relaxation time for the faster process exhibits an exponential dependence on pressure.

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JO - Macromolecules

JF - Macromolecules

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ER -

Pressure-dependent photon correlation spectroscopic investigation of poly(propylene oxide) near the glass transition

Abstract

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