Synthesis of Branched Polyethylene and Characterization of Their Structures and Properties
Bibliographic record
Abstract
The branched polyethylene(br-PE) were synthesized by [ArN-C(An)—C(An)-NAr]NiBr2[An=acenaphthyl,Ar=2,6-C6H3(iPr)2] in the presence of the modified methylaluminoxane(MMAO) and methylaluminoxane(MAO).The effects of experimental conditions in which ethylene pressure,temperature and time were varied on ethylene polymerization were investigated.The structures of the obtained polyethylene were characterized by high-temperature NMR,high-temperature GPC and DSC.It was found that the activities from MMAO were higher than that from MAO about 10 times,which reaches 107 g/(mol Ni·h).The branches of polyethylene prepared from MMAO were about(45—64)/1000C,while that from MAO were about(82—88)/1000C.The mechanical properties of the br-PE were analyzed and compared with low density polyethylene(LDPE) and ethylene propylene methylene(EPM).It was shown that br-PE exhibits high tensile strength(27.90 MPa),which is much higher than LDPE(14.40 MPa) and EPM(5.44 MPa).The elastic modulus of br-PE is 2.10 MPa,almost same as EPM(2.11 MPa).The elongation at break of br-PE is 774.6%,little higher than that of LDPE(725.6%),but lower than that of EPM(1770.1%).
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How this classification was reachedexpand
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 | 0.000 |
| 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 teacher head, 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".