Davletbaeva I M, Dulmaev S E, Sazonov O O, Klinov A V, Davletbaev R S, Gumerov A M
Kazan National Research Technological University 68 Karl Marx Str. Kazan Republic of Tatarstan 420015 Russian Federation
Kazan National Research Technical University named after A.N.Tupolev - KAI 10 Karl Marx Str. Kazan Republic of Tatarstan 420111 Russian Federation.
RSC Adv. 2019 Jul 29;9(41):23535-23544. doi: 10.1039/c9ra05314j.
The hyperbranched polymers have drawn intensive attention in the design of macromolecules and functional materials because of their unique physical and chemical properties resulting from the branched architecture and the high number of functional groups. In the present study, by means of light scattering, viscosimetry, thermomechanical analysis, tensile stress-strain, mechanical loss tangent and water vapor permeability measurements, we demonstrate the hierarchical macromolecular organization of organoboron polyurethanes synthesized using sterically hindered amino ethers (AEBA) of boric acid. It is shown that the water vapor permeability of polyurethanes obtained on the basis of sterically hindered aminoethers of boric acid is due to the peculiarities of the chemical structure of AEBA, which can exhibit an ionomeric nature and the presence of steric hindrances created in the hyperbranched structure of AEBA, which can lead to an increase in free volume in such polyurethanes.
由于支化结构和大量官能团所产生的独特物理和化学性质，超支化聚合物在大分子和功能材料的设计中引起了广泛关注。在本研究中，通过光散射、粘度测定、热机械分析、拉伸应力 - 应变、机械损耗角正切和水蒸气透过率测量，我们证明了使用硼酸的空间位阻氨基醚（AEBA）合成的有机硼聚氨酯的分级大分子组织。结果表明，基于硼酸的空间位阻氨基醚获得的聚氨酯的水蒸气透过率归因于AEBA化学结构的特殊性，AEBA可表现出离聚体性质以及在AEBA超支化结构中产生的空间位阻，这可能导致此类聚氨酯中自由体积的增加。
