Poly(ethylene-co-butylene)-b-(styrene-ran-maleic anhydride) <sub>2</sub> Compatibilizers via Nitroxide Mediated Radical Polymerization
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Telechelic poly(ethylene-ran-butylene) initiator terminated with [tert-butyl[1-(diethoxyphosphoryl)-2,2-dimethylpropyl]amino] nitroxide groups (PEB-(SG1) 2 ) was used to initiate the controlled radical copolymerization of maleic anhydride (MA) and styrene (ST). The ST/MA copolymerizations were performed in 1,4-dioxane at 110°C and resulted in PEB-b-P(ST-ran-MA) 2 triblock copolymers with relatively narrow molecular weight distributions <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:mrow> <m:mrow> <m:mo>(</m:mo> <m:mrow> <m:msub> <m:mover> <m:mi>M</m:mi> <m:mo>¯</m:mo> </m:mover> <m:mi>m</m:mi> </m:msub> <m:mo>/</m:mo> <m:msub> <m:mover> <m:mi>M</m:mi> <m:mo>¯</m:mo> </m:mover> <m:mi>n</m:mi> </m:msub> <m:mo>≈</m:mo> <m:mn>1.5</m:mn> </m:mrow> <m:mo>)</m:mo> </m:mrow> </m:mrow> </m:math> . Gel permeation chromatography (GPC) indicated that the initiator used was ≈93% efficient. The resulting copolymers were then blended as 20 wt.% dispersions in nylon 6 (PA6) at 230°C. With as little as 10 mol.% of MA in the feed to make the PEB-b-P(ST-ran-MA) 2 , blends were deemed dynamically compatibilized based on the reduced particle size. All of the PEB-b-P(ST-ran-MA) 2 /PA6 blends resulted in a minor phase particle size <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:mrow> <m:msub> <m:mrow> <m:mover> <m:mi>D</m:mi> <m:mo>¯</m:mo> </m:mover> </m:mrow> <m:mrow> <m:mtext>vs</m:mtext> </m:mrow> </m:msub> <m:mo>=</m:mo> <m:mn>0.1</m:mn> </m:mrow> </m:math> μm while the PEB-b-P(ST)/PA6 blend had <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:mrow> <m:msub> <m:mrow> <m:mover> <m:mi>D</m:mi> <m:mo>¯</m:mo> </m:mover> </m:mrow> <m:mrow> <m:mtext>vs</m:mtext> </m:mrow> </m:msub> <m:mo>=</m:mo> <m:mn>1.15</m:mn> </m:mrow> </m:math> μm (i.e. no MA in the copolymer). Tensile testing revealed yield stresses and strains decreased steadily from pure PA6 to non-reactive PEB-b-P(ST) 2 /PA6 to PEB-b-P(ST-ran-MA) 2 /PA6. However, no difference in tensile properties was observed between PEB-b-P(ST-ran-MA) 2 /PA6 samples made from PEB-b-P(ST-ran-MA) 2 copolymer of varying MA content.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 it