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Determination of the tacticity of ring‐opened metathesis polymers of norbornene and norbornadiene by 13 C NMR spectroscopy of their hydrogenated derivatives
Author(s) -
AiSamak Basma,
AmirEbrahimi Valia,
Carvill Andrew G.,
Hamilton James G.,
Rooney John J.
Publication year - 1996
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/(sici)1097-0126(199609)41:1<85::aid-pi582>3.0.co;2-y
Subject(s) - norbornene , norbornadiene , tacticity , romp , ring opening metathesis polymerisation , polymer , polymer chemistry , metathesis , materials science , carbon 13 nmr , nuclear magnetic resonance spectroscopy , chemistry , organic chemistry , polymerization , catalysis
The 125 MHz 13 C nuclear magnetic resonance (NMR) spectra of the hydrogenated derivatives of ring‐opened metathesis polymers (ROMP) of bicyclo[2.2.1]hept‐2‐ene (norbornene) and bicyclo[2.2.1]hepta‐2,5‐diene (norbornadiene) prepared using a range of initiators, have been analysed in detail. The signals due to the methylene carbon atoms in the enchained cyclopentyl rings of these polymers show fine structure which is assigned to m and r ring dyads and mm, mr/rm and rr ring triads, enabling the tacticity of the hydrogenated polymer, and thus of the polyolefin precursor, to be determined for high‐ cis or high‐ trans polymers. Novel methods for making high‐ cis polymers are described and solvent‐dependent variations in the stereospecificity of the propagation reaction have been observed.