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Copolymers based on aliphatic diamines of various methylene chain lengths and guanidine hydrochloride were prepared by polycondensation in the melt. Antibacterial activity of water-soluble copolymers based on guanidine against conditionally pathogenic microorganisms Escherichia coli and Bacillus cereus was evaluated using diffusion in agar. A relationship was found between the ratio of the number of hydrophobic methylene groups to the number of ionized guanidines and the antibacterial activity of the copolymers. Several samples showed high antimicrobial activity as compared with polyhexamethyleneguanidine hydrochloride (PHMGHC), which is widely used as a medical disinfectant.

The possibility of preparing modification solutions from sodium naphthalenide wastes and their effect on Teflon adhesion were studied.Organometallic complexes of alkali metals (Li, Na, K) and aromatic hydrocarbons (diphenyl, naphthalene, anthracene, etc.) are widely used to enhance adhesion of inert polymers, including Teflon [1,2]. Wastes remaining after modifying the Teflon surface with Na-naphthalene complex comprise more than 70% of the initial active solution. The spent inactive solution containing various toxic compounds after neutralization is discharged into industrial sewage and pollutes the environment.Arene complexes of metals are unstable; they are prepared under the anaerobic conditions [1,3]. Previously [4], we attempted to prepare arene complexes of metals at room temperature in air using ethers [tetrahydrofuran (THF), dimethyl ethylene glycol, dimethyl diethylene glycol, diethyl diethylene glycol] and obtained dark solutions whose color was determined by the kind of metal and aromatic hydrocarbon.In this study we examined by ESR solutions of sodium and naphthalene in THF, prepared at room temperature. We also examined the possibility of reusing the spent inactive solution of sodium naphthalenide to enhance the Teflon adhesion. EXPERIMENTALThe ESR spectra were recorded on a Bruker ESR-300 spectrometer at T = 298 K. The g-factor in the ESR spectra of the solution in question agrees with that of the naphthalene radical anion [5].We attempted to reuse the spent inactive solution.On adding sodium and naphthalene into the spent solution, its color changed from yellowish to dark brown; according to ESR data, this solution is diamagnetic.