Reference

Synthesis and study of polyimides based on 2-fluoro-7-methyltricyclodecenetetracarboxylic acid dianhydride and different diamines

Synthesis and study of polyimides based on 2-fluoro-7-methyltricyclodecenetetracarboxylic acid dianhydride and different diamines. Zhubanov, B. A.; Almabekov, O. A.; Kravtsova, V. D. (Inst. Khim. Nauk, Alma-Ata, USSR). Izv. Akad. Nauk Kaz. SSR, Ser. Khim., 27(2), 32-8 (Russian) 1977. CODEN: IKAKAK. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 24, 25 The optimum conditions were found for the synthesis of the title dianhydride (I) [63057-68-1] from maleic anhydride [108-31-6] and p-fluorotoluene [352-32-9], and for the synthesis of polyamic acids and polyimides from I and benzidine, 4,4'-diaminodiphenyl ether (II), p-xylylenediamine (III), and hexamethylenediamine (IV). The rate consts. (0.030-0.110 min-1) and overall activation energies (7.8-12.1 kcal/mol) were detd. for thermal cyclodehydration of polyamic acids from I and II, III, and IV. The polyimides were thermally stable to 400.degree. and were classified as medium-frequency dielecs.

Reactions on Ziegler-Natta catalysts

Reactions on Ziegler-Natta catalysts. 15. Introduction of halogenated aralkyl groups into 1,4-polybutadiene and metathesis degradation of the modified polymers. Demel, Hans; Hummel, Klaus (Inst. Org. Chem. Org.-Chem. Technol., Tech. Univ. Graz, Graz, Austria). Makromol. Chem., 178(6), 1699-706 (German) 1977. CODEN: MACEAK. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) 1,4-Polybutadiene [9003-17-2] was aralkylated with p-MeC6H4F [352-32-9], o- [95-49-8], m- [108-41-8], and p-MeC6H4Cl [106-43-4], p-BrC6H4Me [106-38-7], 2-chloro-p-xylene [95-72-7], and 2,4- [95-73-8] and 3,4-dichlorotoluene [95-75-0] in the presence of dicumyl peroxide [80-43-3]. The IR spectra of the products were detd., and the polymers were metathesized by 4-octene [592-99-4] and the products identified by gas chromatog.-mass spectroscopy. Aralkylation was accompanied by methylation.