Synthesis of well-defined polystyrene with multi-functional end groups utilizing cyclotriphosphazene

Autor:	Tomoyuki Itaya, Sadao Negayama, Minoru Sugiyama, Kenzo Inoue
Rok vydání:	1997
Předmět:	chemistry.chemical_classification Polymers and Plastics Organic Chemistry Polymer Coupling reaction End-group chemistry.chemical_compound Electrophilic substitution Anionic addition polymerization Benzyl chloride chemistry Polymer chemistry Materials Chemistry Polystyrene Phosphazene
Zdroj:	Macromolecular Rapid Communications. 18:225-231
ISSN:	1521-3927 1022-1336
DOI:	10.1002/marc.1997.030180303
Popis:	Telechelic polystyrenes with five benzyl chloride moieties at the polymer end (PSt-E) were prepared by coupling reaction of polystyryllithium with hexakis(4-chloromethyl-phenoxy)cyclotriphosphazene (4). The coupling reaction occurs almost quantitatively and unfavorable side reactions were not operative. When a mole ratio [4]/[sec-BuLi] = 9.3 was used, polystyrenes with cyclophosphazene carrying five benzyl chloride moieties at the polymer end (PSt-E) were obtained in more than 90% yield, which have narrow and predictable molecular weights (Mw/Mn = 1.05). A star shaped polystyrene with phosphazene core could also be prepared by using excess polystyryl anions.
Databáze:	OpenAIRE
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