ISSN:
0887-624X
Schlagwort(e):
alkoxyallenes
;
isocyanide
;
block copolymerization
;
allylnickel catalyst
;
living coordination polymerization
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
A living block copolymerization of allene derivatives with 1-phenylethyl isocyanide (3) using [(allyl)NiOCOCF3]2 (1) is described. After complete polymerization of allene monomers such as n-octyloxyallene (2A) with 1, further addition of 3 to the reaction system yielded the corresponding block copolymers in high yield. For instance, a block copolymer (4A, Mn = 39,600, Mw/Mn = 1.20) was obtained in 96% yield by the addition of 3 ([3]/[1] = 250) to the living solution of poly(n-octyloxyallene) (Mn = 14,400, Mw/Mn = 1.03) prepared by the polymerization of 2A in the ratio of [2A]/[1] = 90. The resulting copolymer was a brownish orange gum or a solid, depending on the length of each of the segments. The solubility of the block copolymers could be controlled by the allene components. The copolymer of 2A with 3 having appropriate length of segments was soluble in n-hexane, while that of methoxyethoxyethoxyallene (2D) with 3 was soluble in methanol. © 1997 John Wiley & Sons, Inc.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
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