Benzophenonetetracarboxylic dianhydride

Benzophenone process, 73 583 Benzophenonetetracarboxylic dianhydride (BTDA), 70 406, 407t Benzophenone trifluoroborane, 4 1441 Benzopyran Red, colorant for plastics,... 

Wrasidlo 79) fabricated semipermeable poly(N-amide)imide (26) membrane from 3,3, 4,4 -benzophenonetetracarboxylic dianhydride (27) and isophthalic dihydrazide (28). The membrane with 28 i thickness had a water flux of 11401/m2 day-2000 A and salt rejection of 99.95%, while a 39.8% acetylated cellulose acetate membrane with 16 ji thickness had values of 118 1/m2 day and 99.35%. 

Yamada Y, Furukawa N (1997) Preparation and characterization of siloxane-imide block copolymers based on 3,31-4,4-benzophenonetetracarboxylic dianhydride. Polym J (Tokyo) 29(11) 923... 

Bell et al. [1] synthesized an exhaustive number of position isomers of diaminodi-phenylmethane (MDA), diaminodiphenyl ether (DDE) and diaminobenzophenone (DBF) and demonstrated that the meta linked diamines gave polyimides with markedly lower glass transition temperatures (Tg) than those of para- aksA structure. Interestingly, or/to-linked structures were ineffective in decreasing Tg probably because of possible steric restriction imposed on the rotational freedom of main chains. Melt fusible LARC-TPI developed by NASA is based on this discovery and is composed of 3,3 -DBP and 3,3, 4,4 -benzophenonetetracarboxylic dianhydride (BTDA). Diamines containing one or more stable linkages between aromatic rings such as —O—, —S—, —SO2 -, CO—, —C(CH3)2—, and —C(CF3)2—, have been used to synthesize many tractable polyimides. Some of the standard procedures to prepare these diamines are described below. 

A foam was prepared firom polymeric isocyanate (134 pbw) 3,3, 4,4 -benzophenonetetracarboxylic dianhydride (45 pbw) epoxy novolak resin (20 pbw) wetting agent (1 pbw) methanol (2.5 pbw) N,N, N -tris(dimethylaminopropyl)-s-hexahydrotriazine (2.5 pbw) triethylenediamine (2.5 pbw) and l-phenyl-3-methyl-2-phospholene 1-oxide (2.5 pbw). 

One polymer for which a Py-GC/MS analysis has been performed is poly(3,3 ,4,4 -benzophenonetetracarboxylic dianhydride-a/f-thionin). The structure of the polymer is shown below ... 

Materials. 3,3, 4,4 -Benzophenonetetracarboxylic dianhydride (BTDA), 4,4 -methylenedianiline (MDA), p-aminobenzonitrile (PABN), and p-toluenesulfonic acid monohydrate (PTSA) were of commercial sources and used as received. Graphite fiber used as the reinforcing filler was Hercules HMS grade. 

C35H19N305 polyimide based on 3,3, 4,4 -benzophenonetetracarboxylic dianhydride and 4,4 -diaminotriphenylamine 222... 

Benzophenone, 4,4 -dihydroxy-. See 4,4 -Dihydroxybenzophenone Benzophenone, 2-hydroxy-4-(octyloxy)-. See Benzophenone-12 2-Benzophenone, methyl-. See 2-M ethyl benzophenone p-Benzophenone, methyl-. See 4-M ethyl benzophenone Benzophenone, 4-phenyl-. See p-Phenylbenzophenone 4-Benzoyl biphenyl Benzophenone tetracarboxylate dianhydride 3,3, 4,4 -Benzophenonetetracarboxylate dianhydride. See 3,3, 4,4 -Benzophenone tetracarboxylic dianhydride... 

Benzophenonetetracarboxylate dianhydride Benzophenone-3,3 -4,4 -tetracarboxylic dianhydride BTDA 5,5 -Carbonylbis 1,3-isobenzofurandione... 

Woo et al. [452] synthesized sPI membranes for DMFC using BDSA, ODA and 3,3, 4,4 -benzophenonetetracarboxylic dianhydride (BTDA), with different sulfonation levels controlled by the BDSA/ODA molar ratio. The proton conductivity was moderate (1.7-41 mS.cm ), but the methanol permeability is much lower than Nafion 117. 

Figure 2 Relation between dissolution rate and PAA/PAE blend ratio. BTDA 3,3, 4,4-benzophenonetetracarboxylic dianhydride, DDE 4,4 -diamino-diphenyl ether, ODPA 4,4 -oxydiphthalic anhydride, DAPP 2,2-bis((3-amino-phenoxy)phenyl)propane.

In a 250 ml flask, 2,98 g of bis(p-diaminophenyl)ether was dissolved in 35 ml DMF using mechanical stirring. Then added dropwise 2,4l6 g of 3 3AA-benzophenonetetracarboxylic dianhydride (dissolved in 40 ml DMF) over a period of 100 minutes.Then 1.47 g of maleic anhydride was slowly added, maintained not over 20 C. The resulting MPE amic acid was precipitated in water, filtered and washed with water, dried.MPE amic acid was characterized by Infra-red, DSC and Elemental analysis. 

Chen H, Yin J (2003) Synthesis of autophotosensitive hyperbranched polyimides based on 3,3, 4,4 -benzophenonetetracarboxylic dianhydride and l,3,5-tris(4-aminophenoxy)benzene via end capping of the terminal anhydride groups by ort/io-alkyl aniline. J Poljrm Sci A Poljrm Chem 41 2026-2035... 

A copolycondesation-type poly (amic acid) was synthesized using pyromellitic dianhydride and 3,3, 4,4 -benzophenonetetracarboxylic dianhydride as dianhydride monomers, and 4,4 -oxydianiline as a diamine monomer under microwave irradiation in dimethylformamide. PAA was then converted into a polyimide by an imidization (Li et al., 2008). 

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