Detail of "32703-79-0"

Reference

Amino-substituted-4-t-butylphthalic acid esters

Amino-substituted-4-t-butylphthalic acid esters. Keske, Robert G. (Standard Oil Co. (Indiana), USA). U.S. US 4078142 7 Mar 1978, 4 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C101-66.There are some reagents like 32703-79-0 is used in this study. NCL: 560019000. APPLICATION: US 76-700583 28 Jun 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 25 The esters were prepd. and polymd. 32703-79-0 is just another one chemical used in this study. to give polyimides having improved soly. in org. solvents. Thus, 4-tert-butylphthalic anhydride [32703-79-0] was nitrated and the product was esterified with trimethyl orthoacetate [1445-45-0] to give dimethyl 4-nitro-5-tert-butylphthalate [66644-02-8] which was hydrogenated (5% Pd/C) to give dimethyl 4-amino-5-tert-butylphthlate (I) [66643-12-7]. Heating I 6 h at 340° in N-cyclohexylpyrrolidone contg. boric acid gave homopolymer [66643-14-9] of no.-av. mol. wt. 2304 and inherent viscosity 0.08 in THF. ..

Chemical Influence of the Dianhydride and the Diamine Structure on a Series of Copolyimides Studied by Molecular Dynamics Simulations

Chemical Influence of the Dianhydride and the Diamine Structure on a Series of Copolyimides Studied by Molecular Dynamics Simulations. Pinel, E.; Brown, D.; Bas, C.; Mercier, R.; Alberola, N. D.; Neyertz, S. ( Laboratoire Materiaux Organiques a Proprietes Specifiques (LMOPS), Universite de Savoie, UMR CNRS 5041, Vernaison 69390, Fr.). Macromolecules, 35(27), 10198-10209 (English) 2002 American Chemical Society. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Mol.Several reagents with their cas registry numbers 420839-61-8 and 32703-79-0 are used here. dynamics (MD) simulations were carried out on a series of five polyimides based on two different dianhydrides: the flexible 4,4'-oxydiphthalic dianhydride (ODPA) and the rigid bulky bicyclo(2.2.2)-oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BCDA). The diamines are 4,4'-oxydianiline (ODA), 2-trifluoromethyl-4,4'-oxydiphenylamine (CF3ODA), and 2-methoxy-4,4'-oxydiphenylamine (MeOODA). The polyimides are potential candidates for gas sepn. membranes, and the effects of increasing BCDA content in ODPA/BCDA copolyimides and adding trifluoromethyl or methoxy substituents on ODA were studied at the mol. level. Amorphous long-chain models were built using a hybrid pivot Monte Carlo/MD sampling prepn. procedure. The reproducibility of this approach was tested on a series of eight independently prepd. systems. The d., cohesive energy, Hildebrand parameters, conformational characteristics, intermol. structure, and available void spaces were analyzed for each system. Both the BCDA moiety and the trifluoromethyl substituent on the diamine led to decreasing chain cohesion and increasing available void space. This is attributed to steric effects of the BCDA dianhydride, while the trifluoromethyl group combines both steric and electronic repulsion. The steric effect of the methoxy substituent on the diamine is not strong enough to significantly differ from the unsubstituted system. .