3,3 ,4,4 -Oxydiphthalic

Isomers of 3,3, 4,4 -oxydiphthalic anhydride(3,3, 4,4 -ODPA), i.e., 2,2, 3,3 -oxydiphthalic anhydride (2,2, 3,3 -ODPA) and 2,3,3, 4 -oxydiphthalic anhydride (2,3,3, 4 -ODPA) were synthesized. Polyimides were prepared from these dianhydrides, and their... 

There are only two inexpensive dianhydrides 3,3,4,4,-benzophcnonctctracarbox-ylic dianhydride (BTDA) and pyromellitic dianhydride (PMDA). Some other commercially available dianhydrides were used, like 3,3, 4,4 -biphenyltetracarboxylic dianhydride (BPDA), 2,2,-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA), oxydiphthalic anhydride (ODPA), and 3,3/,4,4/-diphenylsulfonetetracarboxylic dianhydride (DSDA) (Fig. 5.29). Many other dianhydrides are reported in the literature (Fig. 5.30) ... 

Interestingly, aromatic tetracarboxylic acids themselves such as pyromellitic acid (PMA),3,3,4,4,-biphenyltetracarboxylic acid (BPA),4,4 -oxydiphthalic acid... 

The aromatic diamines and dianhydrides used in the preparation of the polyamic acid resins and the diamic acid additives are listed in Figure 1. The 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), 4,4 -oxydianiline (4,4 -ODA), and 3,3 -diaminodiphenylsulfone (3,3 -DDS02) were obtained from commercial sources. The remaining monomers were obtained as experimental materials as follows (1) 4,4 -bis(3,4-dicarboxyphenoxy) diphenylsulfide dianhydride (BDSDA) from General Electric Corporate R D Center (2) 4,4 -oxydiphthalic anhydride (ODPA) from Occidental Chemical Corporation (3) 2,2-bis[4(4-aminophenoxy)phenyl]hexafluoropropane (4-BDAF) from Ethyl Corporation and (4) 2,2-bis[4(3-aminophenoxy)phenyl]hexafluoropropane (3-BDAF) and 3,3 -oxydianiline (3,3 -ODA) from Mitsui Toatsu, Inc. 

A series of 15 wt % isomeric polyimide precursor resin solutions was prepared by the National Aeronautics and Space Administration Langley Research Center. The polymerization procedure has been described previously (2,3). The poly(amic-acid) resin solutions were made from 3,3, 4,4 -benzophenonetetracarboxylic acid dianhydride (BTDA), 4,4 -oxydiphthalic anhydride (ODPA), diaminobenzophenone (DABP), and methylenedianiline (MDA) monomers. 

Zang and coworkers [147] reported the characterization of three homochiral helical coordination polymers of Cu(II) with 2,2, 3,3 -oxydiphthalic dianhydride. TG and powder XRD analyses showed that one of the porous frameworks is stable after the removal of solvent water molecules. In contrast, the others changed their structures to amorphous ones because of the simultaneous loss of solvent and coordination water molecules. 

Poly [4,4 -oxybis(benzoyl chloride)-co-phenolphthalein] Poly [4,4 -oxydiphthalic anhydride-co-3,3 -bis(p-aminophenyl) 440... 

Oxydianiline (ODA) BEYO Chemical Co., 4,4 -Oxydiphthalic anhydride (ODPA) Shanghai Research Institute > o-... 

C22H9BrN205 polyimide based on 3,3, 4,4 -oxydiphthalic dianhydride and 5-bromide-1,3-pheny lene-diamine 213... 

The incorporation of pyridine or triazole improves the adhesion between poly(imide)s and copper.Poly(3,3, 4,4 -benzophenone tetracarboxylic dianhydride-3,5-diamino-l,2,4-triazole) (BTDA-DATA) contains the triazole moiety as repeating units. Poly(4,4 -oxydiphthalic anhydride-1,3-aminophenoxybenzene-8-azaadenine) (ODPA-APB-8-AA) bears the triazole moieties at the end." BTDA-DATA starts to decompose at 350°C. However, ODPA-APB-8-AA starts to decompose at 400°C. The polymers have been tested as adhesives for copper surfaces. The adhesion is increased by the formation of copper complexes. 

Oxydiphthalic anhydride (4,4 -ODPA) can be prepared from chlorophthalic anhydride in < -dichlorobenzene and potassium carbonate. Hexaethylguanidinium chloride is used as a phase transfer catalyst. ... 

D. J. Brunelle and Q. Ye. Method for preparing oxydiphthalic anhydrides using guanidininm salt as catalyst. US Patent 6 706 897, assigned to General Electric Company (Niskayuna, NY), March 16, 2004. 

Intrinsically microporous Pis have been prepared from 2,2 -diamino-l,l -binaphthalene or 4,4 -(9-fluorenylidene)dianiline. As anhydrides pyromel-litic dianhydride, 3,3, 4,4 -biphenyltetracarboxylic dianhydride, 4,4 -oxydiphthalic anhydride, and 4,4 -(hexafluoroisopropylidene)diphthalic anhydride were used [81]. 

A poly(imide-siloxane)/titania hybrid film was fabricated by a sol-gel process by the in situ formation of titania within the poly(imide-siloxane) matrix [85]. The poly(amic acid siloxane) polymer was prepared from 4,4 -oxydiphthalic anhydride, 2, 2-bis [4-(4-aminophenoxy) phenyl] propane, and a,a>-bis(3-aminopropyl)polydimethylsiloxane. Acetylace-tone was used as chelating agent in order to reduce the rate of hydrolysis of titanium alkoxide in the polymer. The presence of titania on the surface of eventually produced films enhances the adhesive strength at the interface. 

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