ISSN:
0025-116X
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Carborane-containing oligoorganosilazanes (COS) (20 to 60 wt.-%) prepared by coammonolysis of (o-carboranylmethoxy)dichloro(phenyl)silane and trichloro(phenyl)silane (COS 1), or 1-chloro-1-phenyl-1-sila-2,7-dioxa-4,5-(1,2-carborano)cycloheptane and dichloro(dimethyl)-silane (COS 2), were used to crosslink polyphenylene type prepolymers on the basis of 4,4′-oxydiacetophenone and acetophenone (FPP-1). This allowed the reduction of the crosslinking temperature of FPP-1 by 100-150°C, retaining a high heat resistance of the final crosslinked polymer. Octamethylcyclotetrasilazane (15 wt.-%) was used to crosslink the carborane-containing prepolymers on the basis of 1,2-bis[4-(4-acetylphenoxy)phenyl]-o-carborane and acetophenone (FPP-2) and 1,2-bis(4-acetylbenzyl)-o-carborane and acetophenone (FPP-3). At 350°C a polymer was formed with a gel fraction amounting to 94%.
Zusätzliches Material:
2 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1990.021910409
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