Effect of PEG Molecular Weight in Hydrophilic-segment on the Crystallization of Cast Film of Water-borne Polyurethane
Bibliographic record
Abstract
The polyurathane are the segmented copolymers that consist of alternating soft and hard segment units. In order to obtain a better synthesizing way of water borne polyurethane (WBPU) dispersion, the WBPU whose macromolecular chain structure combined of anionic and nonionic types was prepared by a new technology of second order expanded chain. Quasi quantitative analytical method of FTIR spectra was adopted to characterize the effect of pre polymerization's condition(time temperature)on pre polymerization's process, and the stable WBPU dispersion was obtained in the following optimal condition: 70 ℃, dimethylolpropionic acid(DMPA) as ionic hydrophilic monomer, polyethylene glycol(PEG) as first order expanded chain agent, triethylamine(TEA) as neutralizing agent, triethylenetetramine (TETA) as second order expanded chain agent, n NCO /n OH =1.3, prepolymerization period 5 h, and expanded chain period 2～4 h. It was indicated by test of forming cast film that it was easy to form cast film with higher PEG molecule weight. Wide angle X ray diffraction (XRD), differential scanning calorimetric (DSC) methods were used to study the effect of PEG molecular weight in hydrophilic segment on the crystallization of WBPU cast films. The results indicated that crystal form of WBPU was monoclinic, and along with the PEG molecule weight increased, the percentage of soft segment and molecular chain pliancy increased resulting in higher crystallinity and tightness.
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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) | 0.001 | 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".