2D-INADEQUATE NMR EVIDENCE FOR THE TERMINATION MECHANISM OF STYRENE FREE-RADICAL POLYMERIZATION

被引:38
作者
HENSLEY, DR
GOODRICH, SD
HUCKSTEP, AY
HARWOOD, HJ
RINALDI, PL
机构
[1] KNIGHT CHEM LAB,DEPT CHEM,AKRON,OH 44325
[2] UNIV AKRON,MAURICE MORTON INST POLYMER SCI,DEPT POLYMER SCI,AKRON,OH 44325
关键词
D O I
10.1021/ma00109a034
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
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.
引用
收藏
页码:1586 / 1591
页数:6
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