Rod-shaped dendrimer
First Claim
1. A cylindrically-shaped dendrimer having at least 8 core branches emanating from an essentially linear core, each core branch extending through at least two generations and having at least two terminal groups provided that (1) the ratio of terminal groups to the branches emanating from the core is more than one, (2) the density of terminal groups in the dendrimer is at least 1.5 times that of an extended conventional star polymer having a similar linear core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the extended conventional star polymer bears only one terminal group, (3) a molecular volume that is no more than 80 percent of the molecular volume of said extended conventional star polymer, and (4) the aspect ratio of the molecules of the dendrimer is at least 2:
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Abstract
Rod-shaped dendrimers having a plurality of dendritic branches emanating from an essentially linear core are prepared by first reacting a linear polyfunctional core compound such as a polyethyleneimine with a first dendritic branching reactant such as an ester of an unsaturated carboxylic acid, e.g., methyl acrylate, and then successively reacting the resulting product with a second dendritic branching reactant such as ethylenediamine and then with the first or another dendritic branching reactant.
The rod-shaped dendrimers are useful in the production of molecular composites and as crystallinity modifiers for polymeric materials.
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Citations
13 Claims
- 1. A cylindrically-shaped dendrimer having at least 8 core branches emanating from an essentially linear core, each core branch extending through at least two generations and having at least two terminal groups provided that (1) the ratio of terminal groups to the branches emanating from the core is more than one, (2) the density of terminal groups in the dendrimer is at least 1.5 times that of an extended conventional star polymer having a similar linear core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the extended conventional star polymer bears only one terminal group, (3) a molecular volume that is no more than 80 percent of the molecular volume of said extended conventional star polymer, and (4) the aspect ratio of the molecules of the dendrimer is at least 2:
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13. A dendrimer which is a dendrimer represented by the formula:
- ##EQU6## wherein ○
I is a polyfunctional linear core, Zc is a functional group bonded to the core and an X group of the first generation, Nc is the number of functional groups 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 Y.sup. t, Nt is zero or a number which corresponds to the number of Zt groups bonded to one Yt group, i represents a number 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 i are the same within a generation and are the same or different in different generations and (2) all Xt Yt (Zt)N t of the terminal generation are the same.
- ##EQU6## wherein ○
Specification