Linear-Dendritic Block Copolymers Based on N-Isopropylacrylamide and Perfluorinated Polyphenylenegermane: Synthesis and Properties at Various Interfacial Boundaries

Properties in Langmuir Monolayers and Langmuir-Blodgett Films of a Block Copolymer Based on N-Isopropylacrylamide and 2,2,3,3-Tetrafluropropyl Methacrylate

“…The relative constant of chain transfer on bis -(pentafluorophenyl)germane during radical polymerization of NIPAAm equal to 2.2 determined previously using Mayo method indicates that if it is possible to use this polymer as a basis for production of block copolymers [ 22 ]. To obtain an amphiphilic linear block copolymer, a chain transfer reaction was used at the initial stage to obtain a functional polymer PNIPAAm–Ge(C 6 F 5 ) 2 H ( Scheme 1 ).…”

“…The surface pressure isotherms of the functional polymer PNIPAAm–Ge(C 6 F 5 ) 2 H using a mixture of solvents chloroform/methanol on subphases of different acidity and at different volumes of spreading solutions were obtained also. The curves were compared with similar curves obtained when chloroform was used as a solvent [ 22 ]. It was found that in the case of the functional polymer PNIPAAm–Ge(C 6 F 5 ) 2 H the presence of methanol in the mixture of the spreading solution does not have a significant effect on the behavior of macromolecules at the water–air interface, that is, only PFMA units participate in the formation of hydrogen bonds.…”

“…Thus, a comprehensive study of the properties of the obtained polymers based on N -isopropylacrylamide at various interphase boundaries showed that the modification of this polymer with a fluorinated linear block is much more efficient than with branched perfluorinated polyphenylenegermane [ 22 ], which illustrates the decrease in the surface energy of the LB film (to 41.0 mJ/m 2 ) in the case of an amphiphilic block copolymer. Low surface energy of the LB film and the hydrophobicity of the block copolymer PNIPAAm–Ge(C 6 F 5 ) 2 –PFMA can be used, for example, to build medical devices with a thromboresistant surface (biosensors, artificial endoprostheses, heart valves and other implants for which the components forming thrombi are unacceptable) [ 39 ].…”

“…Linear-dendritic block copolymers based on N -isopropylacrylamide and perfluorinated polyphenylengermane with different MM of hydrophilic blocks were obtained by chain transfer reaction on bis -(pentafluorophenyl)germane by radical polymerization of N -isopropylacrylamide and subsequent activated polycondensation [ 22 ]. The structure of the polymers was confirmed by IR– and 1 H NMR spectroscopy.…”