This paper deals with the fabrication of non-woven polyurea nanofibers through an electrospinning process and evaluation of their mechanical properties under dynamic conditions. Polyurea is finding increasing applications for protection against dynamic loads like blast and ballistics. Processing polyurea into nanofibers can further improve their properties, especially with respect to mechanical properties and high surface areas, expanding their field of application. Till date, electrospinning has not been explored to prepare polyurea nanofibers. In the present work, segmented polyurea based on polypropylene oxide polyetheramine and isocyanate was processed into nanofibers and the influence of the electrospinning parameters on fiber morphology was studied. Uniform nanofibers could be obtained with polymer concentration > 25 %w/v, tip to collector distance < 20 cm, while maintaining a potential difference> 20 kV. Strain sweep and frequency sweep tests revealed dependence of the linear viscoelastic region of nanofibers on test temperature and the loss factor on frequency respectively.

本文通过电纺丝工艺制备非织造聚脲纳米纤维，并评估其在动态条件下的机械性能。聚脲在防止爆炸和弹道等动态载荷方面正在发现越来越多的应用。将聚脲加工成纳米纤维可以进一步改善其性能，尤其是在机械性能和高表面积方面，从而扩大了其应用范围。迄今为止，尚未探索静电纺丝法制备聚脲纳米纤维。在目前的工作中，将聚环氧丙烷聚醚胺和异氰酸酯为基的分段聚脲加工成纳米纤维，并研究了电纺丝参数对纤维形态的影响。可以获得浓度> 25％w / v的均匀纳米纤维，吸头到集电极的距离<20 cm，同时保持电势差> 20 kV。应变扫描和扫频测试表明，纳米纤维的线性粘弹性区域分别取决于测试温度和损耗因子与频率的关系。