Dynamic and Gas Barrier Properties of Multifunctional Polymer Composites Under Extreme Conditions
Bibliographic record
Abstract
Thermoplastic polymers have shown a great potential for design and development of components and structures in high temperatures – high pressures environments. Recyclability, superior chemical resistance, low production and transportation costs and high strength to weight ratio have given a competitive edge to these polymeric candidates when compared to their metallic counterparts. With the focus on the dynamic, creep and gas barrier properties of thermoplastic polymers under extreme conditions, this study primarily aims to provide robust improvement strategies on the basis of composite science and engineering. Two experimental setups were designed and validated to measure the tensile creep behavior and barrier properties to supercritical carbon dioxide at elevated temperatures. Nonlinear creep characteristics of Polyvinylidene Fluoride copolymer were characterized under 5 MPa to 12.5 MPa tensile stress and at 40 °C to 80 °C, and a generalized temperature dependent model was formulated to generate time-temperature-compliance master curves for creep life predictions. Identification of gas barrier properties from the measured data was optimized using nonlinear regression, which significantly reduced the required time for long permeation tests for standard to advanced engineering thermoplastics. Laminar composite structures of polyethylene and ethylene vinyl alcohol were manufactured, which showed advantages of both utilized polymers in terms toughness in flexural mode and barrier to moisture at target service temperature of 82 °C. Full morphological analysis was performed on the multilayer design to address the fracture surface characteristics as well as the interfacial properties, which was also supported by the chemical composition analysis. Classical lamination theory was shown to effectively predict the experimentally measured data in terms of the equivalent dynamic flexural moduli over the measured temperature range of 35 °c to 85 °C. Graphene nanoplatelets were incorporated in high-density polyethylene to improve the mechanical and barrier properties. The effects of nanoparticles content and processing conditions on the crystallization of the matrix as well as the dispersion of nanoparticles were addressed quantitively using image processing methods. Substantial improvement in creep and barrier properties using laminar and particulate systems confirmed the potential of composite science strategies for improving the properties of thermoplastic polymers in high temperature – high pressure environments.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".