Wei, Haibing; Pei, Xueliang; Fang, Xingzhong published the artcile< Comparative study on polyimides from isomeric 3,3'-, 3,4'-, and 4,4'-linked bis(thioether anhydride)s>, HPLC of Formula: 118-45-6, the main research area is polyimide isomeric thioether anhydride preparation thermal mech property.
Three isomeric bis(thioether anhydride) monomers, 4,4′-bis(2,3-dicarboxyphenylthio) di-Ph ketone dianhydride (3,3′-PTPKDA), 4,4′-bis(3,4-dicarboxyphenylthio) di-Ph ketone dianhydride (4,4′-PTPKDA), and 4-(2,3-dicarboxyphenylthio)-4′-(3,4-dicarboxyphenylthio) di-Ph ketone dianhydride (3,4′-PTPKDA), were prepared through multistep reactions. Their structures were determined via Fourier transform IR, NMR, and elemental anal. Three series of polyimides (PIs) were prepared from the obtained isomeric dianhydrides and aromatic diamines in N-methyl-2-pyrrolidone (NMP) via the conventional two-step method. The PIs showed excellent solubility in common organic solvents such as chloroform, N,N-dimethylacetamide, and NMP. Their glass transition temperatures decreased according to the order of PIs on the basis of 3,3′-PTPKDA, 3,4′-PTPKDA, and 4,4′-PTPKDA. The 5% weight loss temperatures (T5%) of all PIs in nitrogen were observed at 504-519 °C. The rheol. properties of isomeric PI resins based on 3,3′-PTPKDA/4,4′-oxydianiline/phthalic anhydride showed lower complex viscosity and better melt stability compared with the corresponding isomers from 4,4′- and 3,4′-PTPKDA. In addition, the PI films based on three isomeric dianhydrides and on 2,2′-bis(trifluoromethyl)benzidine had a low moisture absorption of 0.27-0.35%. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011.
Journal of Polymer Science, Part A: Polymer Chemistry published new progress about Absorption (water). 118-45-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H3ClO3, HPLC of Formula: 118-45-6.
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics