MétaCan
Menu
Back to cohort
Record W2114834894 · doi:10.1002/polb.21621

Free volume of molten and glassy polystyrene and its nanocomposites

2008· article· en· W2114834894 on OpenAlex
L. A. Utracki

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueJournal of Polymer Science Part B Polymer Physics · 2008
Typearticle
Languageen
FieldMaterials Science
TopicPolymer Nanocomposites and Properties
Canadian institutionsNational Research Council Canada
Fundersnot available
KeywordsPolystyreneOrganoclayMaterials scienceVolume (thermodynamics)ThermodynamicsCompressibilityGlass transitionVolume fractionNanocompositeThermal expansionAtmospheric temperature rangeEquation of stateAnalytical Chemistry (journal)Composite materialChemistryPolymerOrganic chemistryPhysics

Abstract

fetched live from OpenAlex

Abstract The Pressure‐Volume‐Temperature ( PVT ) dependencies of polystyrene‐based clay‐containing nanocomposites (CPNC) were determined in the glassy and molten state. The PVT data in the melt were fitted to the Simha‐Somcynsky (S‐S) lattice‐hole equation‐of‐state (eos), yielding the free volume quantity, h = h ( T , P ), and the characteristic reducing parameters, P *, V *, T *. The data within the glassy region were interpreted considering that the latter parameters are valid in the whole range of independent variables, than calculating h = h ( T , P ) from the experimental values of V = V ( T , P ). Next, the frozen free volume fraction in the glass was computed as FF = FF( P ). In the molten state the maximum reduction of free volume was observed at w solid ≈ 3.6–wt % clay, amount sufficient to adsorb all PS into solidified layer around organoclay stacks. In the vitreous state FF increased with clay content from 0.6 to 1.6—this is the first time FF ≫ 1 has been observed. The highest value was determined for CPNC with the highest clay content, w = 17.1 wt %, thus well above w solid . The derivative properties, compressibility, κ , and the thermal expansion coefficient, α , depend on T , P , and w . Plots of κ versus T indicate the presence of two secondary transitions, one at T β / T g ≈ 0.9 ± 0.1 and other at T T / T g = 1.2 ± 0.1. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2504–2518, 2008

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.061
Threshold uncertainty score0.942

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0010.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0000.001
Science and technology studies0.0010.002
Scholarly communication0.0000.002
Open science0.0010.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.018
GPT teacher head0.228
Teacher spread0.210 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it