ISSN:
0887-624X
Keywords:
living polymerization
;
cationic polymerization
;
styrene
;
end-functionalized polymer
;
macromonomer
;
organosilicon compounds
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The end-functionalization of living polymers with bases (methanol, benzylamine, diethyl sodiomalonate, and sodium methoxide) and organosilicon compounds [X — Si(CH3)3;X —: CH2=C(CH3)COO—, CH3COO—, CH2=CHCH2—, C6H5—] was investigated in the living cationic polymerization of styrene initiated with the 1-phenylethyl chloride/SnCl4/nBu4NCl system in CH2Cl2 at -15°C. The four bases and C6H5SiMe3, independent of their structures, were apparently incapable of reacting with the living end and invariably led to polystyrenes with the ω-end chlorine [∼ ∼ ∼ CH2CH(Ph)Cl] originated from the initiating system. The number-average end-functionality (F̄n) of the chloride, determined by 1H-NMR, was close to unity (F̄n 〉 0.9). The presence of chlorine in the polymer was also confirmed by elemental analysis. In contrast, the quenching by the trimethylsilyl compounds with X = methacryloxy, acetoxy, and allyl gave ω-end-functionalized polystyrenes with the corresponding terminal groups (X) for which the F̄n values were close to unity (F̄n 〉 0.9). The effects of the structure of silyl compounds on end-capping are also discussed. © 1994 John Wiley & Sons, Inc.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1994.080321316
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