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Details for article 6 of 6 found articles
| Title: |
Radiolytic Scissioning in Polydimethylsiloxane Networks |
| Author: |
Tanny, G. B. Pierre, L. E. St. |
| Appeared in: |
International journal of polymeric materials |
| Paging: | Volume 1 (1972) nr. 4 pages 279-293 |
| Year: |
1972-07-01 |
| Contents: |
γ-radiation induced backbone cleavage in stressed polydimethylsiloxane networks displays the stress relaxation profile expected for random scission of a network possessing a Gaussian distribution of chain lengths. G (scission) as measured by stress relaxation, is found to be dose rate dependent below 0.4 Mr/hr, but does not reveal any atmospheric or temperature effects. The value of G (scission) = 0.7, obtained at a dose rate of 0.4 Mr/hr, is in good agreement with that determined from sol-dose measurements. The postulated mechanism of scission is based upon a three step reaction scheme involving a siliconium ion produced initially by γ-ray cleavage of an SiO bond. The ion is capable of reacting with a neighbouring chain before it is terminated by an electron or some other neutralizing species. Mathematical analysis of this mechanism leads to the observed dose rate dependence. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 6 of 6 found articles
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