1975
DOI: 10.1002/pi.4980070106
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Fundamental properties of densified polymeric glasses

Abstract: Glass forming high polymers have been densified by application of high hydrostatic pressure (∼1.5 kbar) in the melt followed by cooling under pressure to ambient. A density increase of about 1% was induced in each of the following polymers: polyvinylchloride, polymethylmethacrylate, polystyrene, poly‐4‐chlorostyrene, poly‐3‐chlorostyrene, poly‐4‐methoxystyrene and poly‐4‐phenoxystyrene. Differential thermal analysis (DSC) and volume relaxation techniques were used to study the reversion of the densified glass … Show more

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Cited by 33 publications
(17 citation statements)
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“…δ > 0 (Fig 1). Over the range of vitrification pressures used (25 -200 MPa), δ varies from ∼6% to 29%, which falls in the range of literature results for other polymers [19,20,21]. That PMMA can be pressure densified is at odds with its conformance to isochronal superpositioning (eq.…”
Section: Resultsmentioning
confidence: 76%
“…δ > 0 (Fig 1). Over the range of vitrification pressures used (25 -200 MPa), δ varies from ∼6% to 29%, which falls in the range of literature results for other polymers [19,20,21]. That PMMA can be pressure densified is at odds with its conformance to isochronal superpositioning (eq.…”
Section: Resultsmentioning
confidence: 76%
“…The first preparation of glasses via pressure densification was by Tammann and Jenckel [21], with the technique having been applied to many materials: inorganic glasses such silica [28,29], hydrogen bonded liquids (phenolphthalein [21,22,38], sucrose [22], and glycerol [23]), the protic ionic liquid carvedilol dihydrogen phosphate [25], rosin (a mixture of organic acids) [21], and polymers including polyvinylethylene (PVE) [24], polystyrene (PS) [27,39,40], polymethylmethacrylate (PMMA) [41,42] and polyvinylchloride (PVC) [43]. In all cases it was reported that the glass cooled under pressure was denser, implying that none of these materials are Roskilde-simple.…”
Section: Discussionmentioning
confidence: 99%
“…In all cases it was reported that the glass cooled under pressure was denser, implying that none of these materials are Roskilde-simple. In some of the experimental studies of pressure densification the density of the compressed glass prior to the removal of pressure is reported, and an experimental δ parameter can be calculated: for PVC δ=0.15 [43], for atactic PMMA δ=0.24 [41], for polystyrene δ=0.13 [22], and for phenolphthalein δ=0.27 [38] (for these liquids P 1 was ~200-270 MPa and P0 was ambient pressure).…”
Section: Discussionmentioning
confidence: 99%
“…data taken from the Ref. [15]. Indeed, we suppose that the free volume can be described by one mean free volume radius resulting in one mean t 3 .…”
mentioning
confidence: 99%