CONTROLLED AGGREGATION OF POLYMER LATICES PART 3. INFLUENCE OF TEMPERATURE AND SURFACE CHEMISTRY
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Bibliographic record
Abstract
ABSTRACT The possibility of obtaining narrowly dispersed particles through the controlled aggregation of polymer latices has been investigated. Concentrated polystyrene, poly(styrene-co-acrylic acid) and poly(styrene-co-butadiene-co-acrylic acid) latices were aggregated through the addition cationic surfactant under stirring. The method under investigation was proven to be effective in obtaining 5-15 urn particles with a narrow size distribution and a strong control of the average size. The aggregation properties of polymer latices were related to their chemical nature (chemical structure of the polymer and surface chemistry); the trends observed were explained through calculations of the fundamental forces involved in this process. Important differences were found between the aggregation of the latices that contain acrylic acid as a comonomer and those without acrylic acid. Narrow size distributions, with geometric standard deviations between 1.2–1.35 were obtained only for the latices containing acrylic acid. It was shown that on the surface of these particles there is a hairy layer formed by the polyacrylic acid chains. The thickness of this layer is dependent on the chemical environment and temperature. Its presence was demonstrated by capillary viscometry and electrophoretic mobility measurements.
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Full frame distilled prediction
Teacher imitationNot 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.
Codex and Gemma teacher scores by category
| 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 | 0.001 |
| 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)
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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 it