SOME PHYSICAL-PROPERTIES OF 2 HOMOLOGOUS SERIES OF PERFLUORO-POLYOXYALKYLENE OLIGOMERS

被引:19
作者
DANUSSO, F
LEVI, M
GIANOTTI, G
TURRI, S
机构
[1] Dip. Chimica Industriale ed Ingegneria Chimica G.Natta, Politecnico di Milano, 20133 Milano
[2] AUSIMONT S.p.A.-Centro Ricerche Sviluppo (CRS), Bollate, Milano
关键词
D O I
10.1016/0014-3057(94)90075-2
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Glass transition temperature T(g), specific volume v and viscosity eta were measured for two homologous series of oligomer fractions having the same linear perfluorinated poly(oxymethylene-co-oxyethylene) molecular body, and a pair of equal end units -CH2OH or -CH2OCOCF3. By decreasing the molecular weight a marked end unit effect is observed in a progressively differing value of every property of the two series. Typical two-parameter equations are valid, to a first approximation, to represent T(g)-M and upsilon-M relations, whereas the diol series shows a remarkably anomalous, non-monotonic trend of the eta-M relation, which does not follow the typical exponential equation below M(c), as does on the contrary the trifluoroacetate series.
引用
收藏
页码:647 / 651
页数:5
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