Novel palladium(II)-catalyzed direct synthesis of polymers with oxamide and urea linkages
- Pennsylvania State Univ., University Park (United States)
Polyoxamides and polyureas are interesting classes of polymers because the high concentration of hydrogen bonds present results in high melting points and superior mechanical properties. Herein, the authors report novel palladium(2)-catalyzed carbonylation of [alpha],[omega]-diamines leading to the synthesis of (a) polyureas and (b) polymers with both oxamide and urea linkages, the relative proportions of which can be varied rationally. The reactions were carried out under an oxidative condition using iodine as promoter. Remarkably, the ratio of oxamide to urea linkages in the resultant polymers was a sensitive function of the added iodine, with the ratio decreasing from 1.5 to 0 with increasing iodine concentration. Unreacted amines constituted the end groups, and, thus, further reactions of the polymers through reactions of the termini should be possible.
- DOE Contract Number:
- FG02-84ER13295
- OSTI ID:
- 6482468
- Journal Information:
- Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 26:7; ISSN MAMOBX; ISSN 0024-9297
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMIDES
AMIDINASES
AMINES
CARBONYLATION
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
ELEMENTS
ENZYMES
HYDROLASES
MECHANICAL PROPERTIES
METALS
NON-PEPTIDE C-N HYDROLASES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
POLYMERS
PROTEINS
SYNTHESIS
TRANSITION ELEMENTS
UREASE