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Stereoregularity in poly[methyl(3,3,3‐trifluoropropyl)siloxane]
Author(s) -
Kuo ChungMien,
Saam John C.,
Taylor Richard B.
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210330210
Subject(s) - siloxane , monomer , polymer , polymer chemistry , polymerization , materials science , amorphous solid , chemistry , organic chemistry , composite material
Anionic ring‐opening polymerization of the cis and trans isomers of 1,3,5‐trimethyl‐1,3,5‐tris(3′,3′,3′‐trifluoropropyl)cyclotrisiloxane ( cis ‐ and trans ‐F 3 ) and their mixtures was conducted under conditions that suppressed siloxane bond redistribution in order to preserve stereoregularity formed in the resulting poly[methyl(3,3,3‐trifluoropropyl)siloxane] (PMTFPS). Proton decoupled 19 F NMR of the resulting polymers was interpreted by assuming that the original stereoconfiguration of the monomer was preserved and that the monomer inserted with a roughly equal probability of forming meso or racemic configurations relative to the configuration of the reacting chain end. Polymers from cis ‐F 3 were solid and crystalline at room temperature while the more typical polymers from mixtures of isomers containing greater than 50% trans ‐F 3 were liquid and amorphous.