ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Polydimethyltin oxide, polydi-n-butyltin oxide, polydi-n-octyltin oxide and polydiphenyltin oxide have been shown to have the structure: Only the polydi-n-octyltin oxide was soluble in xylene and in this case a number-average molecular weight measurement showed that n was 25. The other polymers were found to be uniformly insoluble without reaction, even in polar solvents like dimethylsulfoxide or N-methyl-2-pyrrolidone. These polymers are high melting substances (300-400°) which decompose at or slightly above their melting points; they are hard, brittle, crystalline (x-ray) solids. On pyrolysis at 400° the polydiphenyltin oxide yields tetraphenyltin; the polydi-n-octyltin oxide mostly 1-octene. These polymers react with aqueous sodium sulfide to yield, after acidification, the dialkyl- or diaryl-tin sulfides which are trimeric. These unusual properties have been contrasted to the low melting, amorphous, soluble polydialkylsiloxanes. The differences in these physical properties have been explained on the basis of a highly ionic tin-oxygen bond leading to a R2Sn+2O-2 crystal lattice which would be expected to exhibit the properties found experimentally.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1961.1204915231
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