ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
The changes in solvent resistance and solution viscosity of polyethylene glycol and polypropylene glycol after heating with dicumyl peroxide at 140°C. are consistent with crosslinking of the former and degradation of the latter. Analytical work showed that in both cases all of the peroxide decomposed could be accounted for acetophenone and cumyl alcohol. In the case of polyethylene glycol, crosslinking results from abstraction of secondary hydrogen atoms and dimerization of the resulting radicals; in the case of polypropylene glycol abstraction of tertiary hydrogen atoms leads to radicals which break down by scission at a C—O bond to give a ketone and a more stable radical. This latter process proceeds with an efficiency of unity.
Zusätzliches Material:
2 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1963.070070205
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