Additive manufacturing of aromatic thermoplastics from photocurable precursor salts
AssigneeVirginia Tech Intellectual Properties, Inc.
InventorsJana Herzberger, Timothy E. Long, Viswanath Meenakshisundaram, Christopher B. Williams
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Abstract
In various aspects, a polymer resin is provided for vat photopolymerization. The resin can include a polyamic acid salt formed from the addition of a photocrosslinkable amine to a polyamic acid. The resin can include a photoinitiator suitable for initiating crosslinking of the photocrosslinkable amine when exposed to a light source of a suitable wavelength and intensity. The polyamic acid can be formed, for instance, by the addition of a diamine to a suitable dianhydride. Methods of additive manufacturing using the resins are also provided.
Claims33
A polymer resin for vat photopolymerization, the polymer resin comprising:
- (i) a polyamic acid salt comprising repeat units having a structure according to the following formula
- where each occurrence of R″ comprises a photocrosslinkable group;
- where each occurrence of R is independently selected from the group consisting of H, substituted and unsubstituted alkyl, substituted and unsubstituted heteroalkyl, and substituted and unsubstituted alkenyl;
- where each occurrence of Ar is independently selected from the group
- where each occurrence of X is a substituted or unsubstituted aryl or heteroaryl group;
- where each occurrence of Y is independently selected from the group consisting of O, S, C═O, C(CF3)2, C(CH3)2, SO2, and C≡C;
- (ii) a photoinitiator suitable for initiating crosslinking of the photocrosslinkable groups when exposed to a light source of a suitable wavelength and intensity;
- and
- (iii) a suitable solvent.
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Dependencies are inferred from the claim text.