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| Titel: |
Radiolytic Scissioning in Polydimethylsiloxane Networks |
| Auteur: |
Tanny, G. B. Pierre, L. E. St. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 1 (1972) nr. 4 pagina's 279-293 |
| Jaar: |
1972-07-01 |
| Inhoud: |
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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 6 gevonden artikelen
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