Lactic acid copolyesters with carboxyl derivatives of p-tert-butylthiacalix[4]arene: synthesis and effect of macrocycle conformation on the physicochemical properties

Autor:	Ivan I. Stoikov, Alexander V. Gerasimov, Alena A. Vavilova, Pavel L. Padnya, Vladimir V. Gorbachuk, D. N. Shurpik, Olga A. Mostovaya
Rok vydání:	2019
Předmět:	010405 organic chemistry General Chemistry Buffer solution 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis Lactic acid Solvent Thermogravimetry chemistry.chemical_compound Differential scanning calorimetry chemistry Polymer chemistry Acetone Thermal stability
Zdroj:	Russian Chemical Bulletin. 68:2098-2104
ISSN:	1573-9171 1066-5285
DOI:	10.1007/s11172-019-2672-3
Popis:	An approach to p-tert-butylthiacalix[4]arene derivatives functionalized with lactic acid fragments in three conformations (cone, partial cone, 1,3-alternate) was developed. The use of tetraglyme as a solvent and magnesium sulfate with p-toluenesulfonic acid as co-condensation catalysts made it possible to obtain the desired products without admixtures of oligolactic acid. The structure of the synthesized macrocycles was characterized by a complex of physico-chemical methods. The thermal properties of the synthesized lactic acid copolyesters were studied by simultaneous thermogravimetry and differential scanning calorimetry analysis. Significant effect of the p-tert-butylthiacalix[4]arene platform on the thermal stability of the obtained products was demonstrated. Nanoscale particles of the synthesized macrocycles with a low polydispersity index were obtained using nanoprecipitation from methanol or acetone into a buffer solution.
Databáze:	OpenAIRE
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