In:
Journal of Polymer Science Part A: Polymer Chemistry, Wiley, Vol. 47, No. 23 ( 2009-12), p. 6715-6725
Abstract:
Water‐soluble palladium complexes ci s‐[Pd(L)(OAc) 2 ] ( 1–8 ) (L represents a diphosphine ligands of the general formula CH 2 (CH 2 PR 2 ) 2 , where for a : R (CH 2 ) 6 OH; b–g : R (CH 2 ) n P(O)(OEt) 2 , n = 2–6 and n = 8; h : R (CH 2 ) 3 NH 2 ) have been employed, after activation with a large excess of HBF 4 , for emulsion polymerization of alkenes (propene, butene, and their equimolar mixtures) with carbon monoxide. Aliphatic polyketone lattices with a high solid content (21%), high molecular weight (6.3 × 10 4 g mol −1 ), and narrow polydispersities ( M w / M n ≈ 2) were isolated. The catalytic activity of the dicationic palladium (II) based catalysts, C1–C8 is highly dependent on the length of the alkyl chain of the ligand. Catalyst 3 proved to be highly active for propene/CO copolymers, whereas 6 is active for butene/CO and propene/CO‐butene/CO systems. The presence of methyl β‐cyclodextrin, as a phase‐transfer agent, and undecenoic acid, as an emulsifier, increase the molar mass and the stability of the polyketones and finally the activity of the catalyst. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 6715–6725, 2009
Type of Medium:
Online Resource
ISSN:
0887-624X
,
1099-0518
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
3004641-5
detail.hit.zdb_id:
1473076-5
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