The thermodynamic properties of silicon and germanium diphenyldihydride polyaddition products with the bis-ethinyl derivatives of the same metals

An adiabatic vacuum calorimeter was used to measure the heat absorption capacity ( C p° ) of the polyvinylenediphenylsilyl- (PVS) and polyvinylenediphenylgermyl-αω-dihydribes, and of their copolymer (PVSG) composed of regularly alternating vinylenediphenylsilyl and vinylenediphenylgermyl chain units...

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Bibliographic Details
Published in:Polymer science USSR 1978, Vol.20 (2), p.382-386
Main Authors: Lebedev, B.V., Rabinovich, I.B., Lebedev, N.K., Sladkov, A.M., Vasneva, N.A.
Format: Article
Language:English
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Summary:An adiabatic vacuum calorimeter was used to measure the heat absorption capacity ( C p° ) of the polyvinylenediphenylsilyl- (PVS) and polyvinylenediphenylgermyl-αω-dihydribes, and of their copolymer (PVSG) composed of regularly alternating vinylenediphenylsilyl and vinylenediphenylgermyl chain units in the 7–330°K range with a 0·2% determination accuracy. The glass transition range has been detected and the glass temperatures ( T g ) have been determined. The H T °- H 0°; S T °- S o °, and G T °- G 0° functions were cakculated from the obtained results for the 0–300°K range and the configurational entropy S conf° has been evaluated. The likely reasons for the thermodynamic property differences between the investigated polymers have been assessed.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(78)90048-5