Vol 485, No 2 (2019)

Terpolymers with a molecular weight of 65 and 13 kDa containing 90 mol % of N-vinylpyrrolidone, 7 mol % of N-vinylformamide, and 3 mol % of N-vinyliminodiacetic acid units have been synthesized. Diethyldithiocarbamate and benzyldithiocarbamate have been used as coligands. The mixed-ligand complexation with Ga³⁺ ion has been studied by HPLC. The composition and structure of the resulting metal–polymer complexes have been determined by exclusion chromatography and spectral (IR, ¹H NMR) data.

Cationic copolymerization of cholesterol vinyl ether with N-allenylpyrrolidone yielded co-oligomers with molecular mass of 1200–2100. The polymerization of N-allenylpyrrolidone involves both 1,2- and 2,3-positions of the allenyl substituent to give four types of units as a result of prototropic isomerization of the initially formed structures. In the developed method, the composition of co-oligomers can be controlled and, hence, their hydrophilic/hydrophobic balance, solubility, and membranotropic properties can also be contolled to change the potential biological activity of the products.

A new method was proposed to produce high-flexural-strength corundum ceramics from α-Al₂O₃ samples synthesized by heat treatment of boehmite AlOOH at 1300°C for 5 h. It was shown that hydrothermal treatment of MDGA-grade hydrargillite at 200°C in a 0.4 wt % magnesium acetate solution for 3 days gives finely crystalline boehmite, which is a feedstock for synthesizing corundum ceramics with a flexural strength of 400 MPa.