Polyimide aerogels having polyamide cross-links and processes for making the same
View Patent ↗An aerogel and process of making the aerogel is provided. The aerogel is a polyimide aerogel having polyamide cross-links formed using a triacid chloride cross-linker.
1. An aerogel, comprising:
a polyimide oligomer component; and
a triacid chloride cross-link, the triacid chloride cross-link connected to the polyimide oligomer component, the polyimide oligomer component comprising a reaction product of a combination of diamines and a dianhydride in a ratio of (n+1) to n where n is the number of repeat units in the oligomer.
2. The aerogel of claim 1 , wherein the combination of diamines includes equal parts of a first diamine and a second diamine.
3. The aerogel of claim 2 , wherein the polyimide oligomer component comprises a backbone structure wherein the first and second diamines alternate.
4. The aerogel of claim 3 , wherein the first diamine comprises one of oxydianiline (3,4′-ODA) and 4,4′-oxydianiline (4,4′-ODA).
5. The aerogel of claim 4 , wherein the second diamine comprises 2,2′-dimethylbenzidine (DMBZ).
6. The aerogel of claim 3 , wherein n is between 10 and 30.
7. The aerogel of claim 3 , containing a polymer concentration greater than or equal to 7 wt. % and less than or equal to 10 wt. %.
8. The aerogel of claim 7 , wherein the dianhydride can is selected from the group consisting of benzophenone-3,3′,4,4′-tetracarboxylic dianhydride (BTDA), 2,2′-bis(3,4′-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), and biphenyl-3,3′,4,4′-tetracarboxylic dianhydride (BPDA).
9. An aerogel, comprising:
a polyimide oligomer component; and
a triacid chloride cross-link, the triacid chloride cross-link connected to the polyimide oligomer component, the polyimide oligomer component comprising a reaction product of a combination of diamines and a combination of dianhydrides in a ratio of (n+1) to n where n is the number of repeat units in the oligomer.