Auckloo Sheik Ambarine Banon, Palaniandy Khanisya, Hung Yew Mun, Lazzara Giuseppe, Chai Siang-Piao, Pasbakhsh Pooria
Mechanical Engineering Discipline, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, Subang Jaya 47500, Malaysia.
Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
Nanomaterials (Basel). 2021 Nov 8;11(11):2998. doi: 10.3390/nano11112998.
This study, for the first time, focused on the fabrication of nonporous polyurea thin films (~200 microns) using the electrospinning method as a novel approach for coating applications. Multi-walled carbon nanotubes (MWCNTs) and hydrophilic-fumed nanosilica (HFNS) were added separately into electrospun polyurea films as nano-reinforcing fillers for the enhancement of properties. Neat polyurea films demonstrated a tensile strength of 14 MPa with an elongation of 360%. At a loading of 0.2% of MWCNTs, the highest tensile strength of 21 MPa and elongation of 402% were obtained, while the water contact angle remained almost unchanged (89°). Surface morphology analysis indicated that the production of polyurea fibers during electrospinning bonded together upon curing, leading to a nonporous film. Neat polyurea exhibited high thermal resistance with a degradation temperature of 380 °C. Upon reinforcement with 0.2% of MWCNTs and 0.4% of HFNS, it increased by ~7 °C. The storage modulus increased by 42 MPa with the addition of 0.2% of MWCNTs, implying a superior viscoelasticity of polyurea nanocomposite films. The results were benchmarked with anti-corrosive polymer coatings from the literature, revealing that the production of nonporous polyurea coatings with robust strength, elasticity, and thermal properties was achieved. Electrospun polyurea coatings are promising candidates as flexible anti-corrosive coatings for heat exchanges and electrical wires.
本研究首次聚焦于采用静电纺丝法制备无孔聚脲薄膜（约200微米），将其作为一种用于涂层应用的新方法。多壁碳纳米管（MWCNTs）和亲水性气相纳米二氧化硅（HFNS）分别作为纳米增强填料添加到静电纺聚脲薄膜中，以提高其性能。纯聚脲薄膜的拉伸强度为14 MPa，伸长率为360%。在MWCNTs的负载量为0.2%时，获得了最高拉伸强度21 MPa和伸长率402%，而水接触角几乎保持不变（89°）。表面形态分析表明，静电纺丝过程中聚脲纤维在固化时粘结在一起，形成了无孔薄膜。纯聚脲具有高耐热性，降解温度为380 °C。在用0.2%的MWCNTs和0.4%的HFNS增强后，降解温度提高了约7 °C。添加0.2%的MWCNTs后，储能模量增加了42 MPa，这意味着聚脲纳米复合薄膜具有优异的粘弹性。研究结果与文献中的防腐聚合物涂层进行了对比，结果表明已成功制备出具有高强度、弹性和热性能的无孔聚脲涂层。静电纺聚脲涂层有望成为用于热交换器和电线的柔性防腐涂层。
