Branched and hyperbranched polyetherimides
AssigneeThe Board of Trustees of the University of Illinois
InventorsJeffrey S. Moore, D. Scott Thompson, Larry J. Markoski
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Abstract
Branched or hyperbranched polymeric structures which contain at least one etherimide branch point, more specifically from stable A1Bn (where n≧2), AB, AA, and BB monomers; Am end-capping agents (where m=1); Bn cores (where n≧1) and combinations thereof; with controllable degrees of branching (DB=0-1), molecular architectures, end-group compositions, along with methods for their preparation.
Claims22
A branched or hyperbranched polymeric structure which contains at least one etherimide branch point from the group comprising any of the following generic structures:
- (a) at least one structural unit which is considered to be an etherimide branch point of an A1B2 type having at least one of the following structures
- (b) at least one structural unit which is considered to be an etherimide branch point of an A1B3 type having at least one of the following structures
- (c) At least one structural unit similar to those in (b) above and derived from A1Bn branch points (where n>3);
- (d) at least one structural unit which contains an aryl imide and is considered to be an etherimide branch point of an A1B2 type of which the naphthalimide structures below are an example having at least one of the following structures
- (e) at least one structural unit which contains an aryl imide and is considered to be an etherimide branch point of an A1B2 type and of which the naphthalimide structures below are an example having at least one of the following structures
- (f) At least one structural unit similar to those in (e) above and derived from A1Bn branch points (where n>3).
A method to produce materials from at least one AmBn monomer, (where m=1 and n≧1) comprising:
- (a) reacting an amino-phenol and an aromatic anhydride using heat and in the presence of acetic acid to produce an arylimide;
- (b) mixing the arylimide with a silyl electrophile and a base in the presence of an organic solvent, wherein the silyl electrophile has the structure
- where either R1, R2, or R3 or all (R1, R2, and R3) have more than one carbon atom when m=1 and n=1, or R1, R2, or R3 have one carbon atom or more when m=1 and n is greater than 1 and X is a leaving group;
- and
- (c) polymerizing the AMBN monomer.
An AmBn monomer(where m=1 and n≧1), made by the steps of:
- (a) reacting an amino-phenol and an aromatic anhydride using heat and in the presence of acetic acid to produce an arylimide;
- and
- (b) mixing the arylimide with a silyl electrophile and a
- base in the presence of an organic solvent, wherein the silyl electrophile has the structure
- where either R1, R2, or R3 or all (R1, R2, and R3)have more than one carbon atom when m=1 and n=1, or R1, R2, or R3 have one carbon atom or more when m=1 and n is greater than 1 and X is a leaving group, produces the AmBn monomers of the present invention.
Dependencies are inferred from the claim text.