Photoacid generators are used as components of photocurable polymer formulations and chemically amplified photoresists in microelectronics industry. In recent years, these compounds gained importance as components of various engineering materials. The review presents the classification of photoacid generators and summarizes data on photochemical processes giving photoacids. A special section is devoted to practical applications of photoacid generators and the current state of their development. The bibliography includes 118 references.

Novel hyperbranched poly ([1,2,3]-triazole-[1,3,5]-triazine)s (HBP TT) were synthesized by a 1,3-dipolar cycloaddition reaction from AB 2 monomer -2-azido-4,6-bis-prop-2-yn-1-yloxy-[1,3,5]-triazine (ABPOT). The monomer contains one azide group A and two terminal alkyne units B. Thermal polymerization of ABPOT in bulk or in DMF solution leads to hyperbranched polymers containing both 1,4-and 1,5-disubstituted [1,2,3]-triazoles. The monomer was also polymerized catalytically in the presence of Cu(I) salts under mild reaction conditions in DMSO solution and in bulk affording hyperbranched poly-[1,2,3]-triazoles 1,4-disubstituted only. The reactions lead to the products soluble in aprotic polar solvents like DMSO or DMF. Side reactions can proceed in a few cases, particularly: (i) homocoupling of alkyne groups, leading to the formation of insoluble products as a result of cross-linking, (ii) isomerization of propynyloxytriazine fragments to propynyl-or propadienyltriazinone ones, and (iii) hydrolysis of triple bonds without the loss of solubility. Heats of formation of monomer and synthesized polymers were calculated from their combustion heats. All products were characterized by NMR-, IR-spectroscopy, and size exclusion chromatography (SEC) data. The obtained results open the prospect for the use of HBP TT as the high-enthalpy modifiers for energetic and non-energetic binders.

The kinetics of the noncatalytic reactions of isophorone diisocyanate with n propanol, isopro panol, 1,3 diazidopropan 2 ol, propargyl alcohol, and phenol in toluene in the temperature range from 20 to 90°C at the stoichiometric ratio of reactive groups has been investigated by IR spectroscopy. The apparent rate constants for the reactions of the aliphatic and cycloaliphatic isocyanate groups of isophorone diisocy anate with all of the alcohols have been measured. The activation parameters of the reactions of isophorone diisocyanate with n propanol, isopropanol, and 1,3 diazidopropan 2 ol have been determined. The data obtained are considered in terms of the alcohol structure and molecular organization of solutions.

Nowadays, hyperbranched polymers (HBP) are obtained by different polycondensation and polyaddition reactions [1]. Almost interest is the reaction of 1,3-dipolar cycloaddition of azides to alkynes (1,3-DCA) [2, 3]. There is a series of papers dedicated to the preparation of triazine-triazole HBPs [4, 5, 6]. These polymers were obtained by the reaction of azido-acetylene AB2 monomers polyaddition: 2-azido-4,6-bis (propyne-2-yloxy) -1,3,5-triazine (ABPOT) and 2,4-diazido-6- (propine-2-yloxy) -1,3,5-triazine (DAPOT) (Fig. 1).

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