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Synthesis of end‐functionalized oligomers by one‐batch cationic polymerization
Author(s) -
Nguyen Hung Anh,
Guis Christine,
Cheradame Hervé
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200007)157:1<121::aid-masy121>3.0.co;2-l
Subject(s) - cationic polymerization , polymerization , polymer chemistry , context (archaeology) , chemistry , polymer , monomer , materials science , combinatorial chemistry , organic chemistry , biology , paleontology
The synthesis of end‐functionalized oligomers by cationic polymerization is examined. Special attention is devoted to the problem of achieving this synthesis in a one‐batch process, starting from the monomer and an additive which is properly functionalized. The functions of interest are chosen among the pseudohalide functions, azide and isothiocyanate. The functionalizing cationic polymerization of 2‐methylpropene was the main system discussed in this context. A brief mention about the behavior of 1,3‐pentadiene, isobutylvinylether, and 2‐methyl‐2‐oxazoline is presented. It is shown that depending upon the strength of the Lewis acid and the experimental conditions, the specificity of the functionalization and the possibility of a controlled polymerization can be obtained. The experimental observations can be rationalized by assuming an equilibrium between the active species and the dormant chain ends containing a halide or a pseudohalide. This assumption allows to explain the synthesis of polymers containing two different types of chain termini but corresponding to a narrow molecular weight distribution.