ISSN:
1572-8870
Keywords:
Silphenylene
;
silphenylene siloxane
;
structure property relationships
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Some representative oligomers were prepared by polycondensation reactions of dimethyldichlorosilane with 1,4-di-Grignard reagent prepared from 1,4-dibromobenzene in diethyl ether. The structural characterization of the oligomers was carried out by FTIR and1H,13C, and29Si NMR spectroscopy. TheM n values were determined by vapor pressure osmometry. TheT g values were measured by DSC and the thermodegradation process was analyzed by TGA. In all cases the oligomers prepared in the absence of the blocking end group showed siloxane units in the main chain, which were quantified by1H and29Si NMR.29Si NMR was also used to determine the oligomer sequence. It was possible to correlate the $$\bar M_n $$ and structure withT g and with temperature at 3% weight loss. The results agree with these obtained for structurally similar polymers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01157524
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