| dc.creator | Saunders, D. W. | |
| dc.creator | Parsons, D. A. | |
| dc.creator | Lightfoot, D. R. | |
| dc.date | 2017-08-21T15:35:21Z | |
| dc.date | 2017-08-21T15:35:21Z | |
| dc.date | 1967-08 | |
| dc.date.accessioned | 2022-05-09T10:11:33Z | |
| dc.date.available | 2022-05-09T10:11:33Z | |
| dc.identifier | http://dspace.lib.cranfield.ac.uk/handle/1826/12350 | |
| dc.identifier.uri | https://reports.aerade.cranfield.ac.uk/handle/1826.2/4528 | |
| dc.description | Cross-linked samples of polyethylene were prepared by electron irradiation of both high and low density polymers in the crystalline state. A further cross-linked sample was obtained by curing a high density polyethylene by reaction with dicumyl peroxide at 180°C. The stress-strain birefringence relations were obtained, on specimens cut from these samples, at temperatures between 130 and 250°C. All samples showed a substantial decrease in stress-optical coefficient with increasing degree of cross-linking and with increasing temperature. The stress-optical properties at each temperature were extrapolated to zero degree of cross-linking to give quantities characteristic of the Guassian network. Comparison of these properties with Gaussian theory of the network leads to a value of ca.1150 cals/mole for the difference in energy between trans and gauche conformations of successive links of the polyethylene chain and also indicates that the optical anisotropy of a - CH2 group in the elastomeric state is more nearly given by Denbigh’s than by Bunn and Daubeny's polaris-abilities. | |
| dc.language | en | |
| dc.publisher | College of Aeronautics | |
| dc.relation | CoA/N/Mat-11 | |
| dc.relation | 11 | |
| dc.title | The temperature dependence of photo-elastic properties of cross-linked amorphous polyethylenes | |
| dc.type | Report |
| Files | Size | Format | View |
|---|---|---|---|
| COA_N_MAT_11_1967.pdf | 2.866Mb | application/pdf |
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