ISSN:
0887-624X
Schlagwort(e):
photopolyaddition
;
bis(alkoxyallene)
;
dithiol
;
alkoxyallene
;
high pressure mercury lamp
;
irradiation
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Polyadditions of 1,4-benzenedithiol (BDT) to bis(alkoxyallene)s, such as 1,4-bis(allenyloxy)xylene (3) and 1,4-bis(allenyloxy) benzene (4), were carried out in benzene at 25°C by irradiation with a high pressure mercury lamp. Thiol groups were added to the terminal double bonds of the allenyloxy groups selectively to afford polymers containing reactive carbon-carbon double bonds in the main chain, similar to the radical polyadditions using azobis(isobutyronitrile) (AIBN). The molecular weight of the polymer obtained from BDT and 3 was 10 times higher than that of the polymer produced in the radical polyaddition with AIBN; whereas the molecular weight of the polymer from BDT and 4 was similar to that in the radical polyaddition, probably because of poor solubility of 4 and the polymer toward benzene. The geometrical structure of carbon-carbon double bonds in the polymer isomerized from an E to Z structure with reaction time by virtue of both the addition elimination of thiyl radical to the double bonds and the UV irradiation. © 1996 John Wiley & Sons, Inc.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
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