Špírková Milena, Hodan Jiří, Konefał Rafał, Machová Luďka, Němeček Pavel, Paruzel Aleksandra
Institute of Macromolecular Chemistry CAS, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic.
Polymers (Basel). 2020 Sep 2;12(9):2001. doi: 10.3390/polym12092001.
A series of waterborne polycarbonate-based poly(urethane-urea) nanocomposite films were prepared and characterized. An isocyanate excess of 30 mol% with respect to the hydroxyl groups was used in the procedure, omitting the chain-extension step of the acetone process in the dispersion preparation. The individual steps of the synthesis of the poly(urethane-urea) matrix were followed by nuclear magnetic resonance (NMR) spectroscopy. The nanofillers (1 wt% in the final nanocomposite) differed in nature and shape. Starch, graphene oxide and nanocellulose were used as representatives of organic nanofillers, while halloysite, montmorillonite, nanosilica and hydroxyapatite were used as representatives of inorganic nanofillers. Moreover, the fillers differed in their shape and average particle size. The films were characterized by a set of methods to obtain the tensile, thermal and surface properties of the nanocomposites as well as the internal arrangement of the nanoparticles in the nanocomposite film. The degradation process was evaluated at 37 °C in a HO + CoCl solution.
制备并表征了一系列水性聚碳酸酯基聚（聚氨酯-脲）纳米复合薄膜。在该过程中，异氰酸酯相对于羟基过量30 mol%，在分散体制备中省略了丙酮法的扩链步骤。聚（聚氨酯-脲）基体合成的各个步骤通过核磁共振（NMR）光谱进行跟踪。纳米填料（在最终纳米复合材料中为1 wt%）在性质和形状上有所不同。淀粉、氧化石墨烯和纳米纤维素用作有机纳米填料的代表，而埃洛石、蒙脱石、纳米二氧化硅和羟基磷灰石用作无机纳米填料的代表。此外，填料在形状和平均粒径上也有所不同。通过一组方法对薄膜进行表征，以获得纳米复合材料的拉伸、热和表面性能以及纳米复合薄膜中纳米颗粒的内部排列。在37°C的HO + CoCl溶液中评估降解过程。
