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6601208 
Journal Article 
2D-INADEQUATE NMR EVIDENCE FOR THE TERMINATION MECHANISM OF STYRENE FREE-RADICAL POLYMERIZATION 
Hensley, DR; Goodrich, SD; Huckstep, AY; Harwood, HJ; Rinaldi, PL; , 
1995 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
AMER CHEMICAL SOC 
WASHINGTON 
28 
5 
1586-1591 
English 
WOS:A1995QK08100034 
1D- and 2D-INADEQUATE NMR data for two poly(styrene-alpha-C-13) samples are presented. They represent the first recorded detection of the head-to-head enchainments in polystyrene that result when polystyrene radicals terminate by combination. Resonances that are attributable to structures resulting from head-to-head propagation reactions and to a terminal methylene carbon, which may have been produced either by a chain transfer reaction or by a disproportionation termination reaction, have also been detected. The C-13 NMR spectra of several polymers and copolymers that serve as models for head-to-head enchainments in polystyrene are also discussed.