Adhesion and Detachment Mechanisms between Polymer and Solid Substrate Surfaces: Using Polystyrene–Mica as a Model System
Bibliographic record
Abstract
The adhesion and detachment of polymer and solid substrate surfaces play important roles in many engineering applications such as for designing adhesives, biomedical adhesives, adhesive tapes, robust protective coatings, biomedical scaffolds, prosthetic devices (e.g., artificial joints and implants), and fabrication of micro- and nanoelectromechanical devices. In this work, a surface forces apparatus (SFA) coupled with top-view optical microscopy was employed to measure the adhesion between thin polystyrene (PS) films and a mica substrate to probe their detachment behaviors. Various factors, including molecular weight (MW), contact time, and polarity-enhancing UV/ozone treatment, were examined. The results show that increased chain-end density, chain mobility, and segment polarity can all contribute to enhanced adhesion strength for both the “symmetric” PS–PS and “asymmetric” PS–mica systems but attributed to different adhesion/detachment mechanisms. For the asymmetric PS–mica system, the increased chain-end density (lower MW), increased chain mobility, and increased polarity (induced by UV/ozone treatment) facilitate the rearrangement of the polystyrene chains and the development of mainly “polar” interactions such as dipole–dipole, dipole–induced dipole, and attractive hydrogen bond interactions between the polar groups on the UV-treated PS (the π-electron clouds of the phenyl rings) and the highly polar mica surface. For the symmetric PS–PS system, the enhanced adhesion is mainly due to the interdiffusion, interdigitation, interpenetration, and entanglement of chains across the polymer–polymer contact interface. Importantly, during the separation of a UV/ozone-treated PS surface from mica, “stick–slip” detachment was observed, resulting in a residue of concentric polymer rings left on the mica surface. Our results provide new fundamental and practical insights into the adhesion, detachment, and damage (wear) mechanisms of polymer–polymer and polymer–solid surfaces.
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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 | 0.001 |
| 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".