Hydrolytically-stable dense star polyamine
First Claim
1. A dense star polyamine having at least one core branch emanating from a core, each core branch having at least one terminal amine group provided that (1) the ratio of terminal amine groups to the branches emanating from the core is 2:
- 1 or greater, (2) the density of terminal amine groups in the dense star polyamine is at least 1.5 times that of an extended conventional star polyamine having similar core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the conventional star polyamine bears only one terminal amine group, and (3) a molecular volume that is equal to or less than 80 percent of the molecular volume of said extended conventional star polyamine.
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Abstract
Dense star polyamines having terminal group densities greater than extended conventional star polyamines exhibit greater and more uniform reactivity than their corresponding extended conventional star polyamines. For example, a second generation, amine-terminated polyamine dense star polyamine prepared from tri(2-aminoethyl)amine and aziridine has 4.7×10-3 amine moieties per unit volume (cubic Angstrom units) in contrast to the 1.7×10-3 amine moieties per unit volume contained by an extended conventional star polyamine. Such dense star polyamines are useful as calibration standards, high efficiency proton scavengers and in making size selective membranes.
255 Citations
21 Claims
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1. A dense star polyamine having at least one core branch emanating from a core, each core branch having at least one terminal amine group provided that (1) the ratio of terminal amine groups to the branches emanating from the core is 2:
- 1 or greater, (2) the density of terminal amine groups in the dense star polyamine is at least 1.5 times that of an extended conventional star polyamine having similar core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the conventional star polyamine bears only one terminal amine group, and (3) a molecular volume that is equal to or less than 80 percent of the molecular volume of said extended conventional star polyamine.
- View Dependent Claims (2, 3, 4, 5, 13, 14, 19, 21)
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6. The dense star polyamine which is a dendrimer represented by the formula:
- ##EQU7## wherein ○
I is a polyfunctional core, Zc is a functional group bonded to the core and an X group of the first generation, Nc is the number of functional group bonded to the core, Xi is a monofunctional tail of a repeating unit Yi of the i generation which is bonded to Yi and a Z group of the i-1 generation, Zi is a functional group bonded to Yi and an X group of the i+1 generation, Ni is a number of at least 2 which corresponds to the multiplicity of the polyfunctional head of Yi, π
is the product function, Ni-1 is a number of at least 2 which corresponds to the multiplicity of the polyfunctional head of Yi-1 wherein Yi-1 is a repeating unit of the Yi-1 generation, Xt is the monofunctional tail of a repeating unit Yt of the terminal generation, Zt is a terminating group bonded to Yt, Nt is zero or a number which corresponds to the number of Zt groups bonded to one Yt group, i represents a nunmber of a particular generation in a series from 1 to a number from 1 to t-1, provided that (1) all Xi Yi (Zi)N.spsb.i are the same within a generation and may be the same or different in different generations and (2) all Xt Yt (Zt)N.spsb.t of the terminal generation are the same. - View Dependent Claims (7, 8, 9, 10, 11, 12, 15, 16, 17, 18, 20)
- ##EQU7## wherein ○
Specification