Author : Randy A. Johnson
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (227 download)
Book Synopsis Synthesis and Characterization of Thianthrene-Based Polyamides by : Randy A. Johnson
Download or read book Synthesis and Characterization of Thianthrene-Based Polyamides written by Randy A. Johnson and published by . This book was released on 1994 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thianthrene-2,7- and -2,8-dicarboxylic acids plus a synthetic intermediate, 4,4'-thiobis(3-chlorobenzoic acid), have been synthesized in good yields via nucleophilic aromatic substitution of Na2S on N, N-dimethyl-3,4- dichlorobenzamide. New aromatic polyamides having inherent viscosities of 1.29 to 2.39 dL/g were prepared by the direct polycondensation reaction of the dicarboxylic acids with 4,4'-oxydianiline and 1,4-phenylenediamine in N-methyl- 2-pyrrolidinone using triphenyl phosphite and pyridine. The fused-ring thianthrene-based polyamides were more soluble than analogous poly(thioether amide)s. Polymer films were cast from either DMF or DMAc/LiCl solutions and analyzed by FTIR and NMR. All prepared aramids displayed good thermal stability by DSC and TGA.