Copolymers of 3,5‐dimethylphenyl acrylate and methyl methacrylate: synthesis, characterization and determination of monomer reactivity ratios
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Bibliographic record
Abstract
Abstract Copolymers of 3,5‐dimethylphenyl acrylate (DMPA) and methyl methacrylate (MMA) having various compositions were synthesized using free radical solution polymerization in butane‐2‐one at 70 ± 1 °C with benzoyl peroxide as initiator. The structure of the copolymer was confirmed by FTIR, 1 H NMR and 13 C NMR spectroscopic techniques. The polydispersity indices of the copolymers determined using gel permeation chromatography suggest that the chain termination by disproportion was predominant when the mole fraction of MMA in the feed is high and radical recombination was predominant when the mole fraction of DMPA was high in the feed. The glass transition temperature of the copolymer increases with increase in MMA content. The thermal stability of the copolymers increases with increase in DMPA content. The copolymer compositions were determined using 1 H NMR analysis. The monomer reactivity ratios were determined by application of conventional linearization methods such as the Fineman–Ross ( r 1 = 0.3942; r 2 = 2.3250), the Kelen–Tüdös ( r 1 = 0.3848; r 2 = 2.2584), an extended Kelen–Tüdös ( r 1 = 0.3608; r 2 = 2.3384) and a non‐linear error‐in‐variables model method using a computer program, RREVM ( r 1 = 0.3879; r 2 = 2.2642). These values suggest that MMA is more reactive than DMPA and the copolymer will be richer in MMA units. Copyright © 2003 Society of Chemical Industry
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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 | 0.000 |
| 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)
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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