Pessan Cibele Carneiro, de Lima Bruno Henrique Ramos, Leite Edson Roberto
Materials Engineering Department, Federal University of São Carlos (UFSCar) 13565-905 São Carlos SP Brazil
nChemi - Engenharia de Materiais LTDA Rua Alfredo Lopes, 1717, sala d11 13560-460 São Carlos SP Brazil
Nanoscale Adv. 2019 Jan 3;1(3):973-979. doi: 10.1039/c8na00345a. eCollection 2019 Mar 12.
The FeO@Poly(1,4-butanediol)/polyurethane nanocomposite is a highly interphase-dependable material with unique characteristics. Firstly, the nanoparticle's organic shell allows simple fabrication of very well dispersed nanocomposites and the incorporation of extremely high amounts of nanoparticles (NP) into the polymer matrix. Secondly, both chemical and physical aspects of the nanoparticles determine the material's mechanical behavior. The chemical functionality of the organic layer - free hydroxyl groups at the end of the tethered chains - ensures the material's stiffening through covalent bonds with the matrix, while being at molten state provides high flexibility and deformability yet maintaining mechanical resistance. As a result, nanocomposites at the low concentration region show increased elastic modulus and tensile strength and slight increase in total strain, while highly concentrated nanocomposites show reduction of elastic modulus and tensile strength and roughly double the total strain. The combination of the chemical and physical functionalities ensures high compatibility between nanoparticles and matrix and allows the production of highly concentrated - above 90% in weight - nanocomposites as a cohesive and flexible material, instead of a brittle wafer. This bifunctionality effect is unprecedented and the results open a wide range of new possibilities in the tailoring of functional nanomaterials for all sorts of applications in materials science.
FeO@聚（1,4-丁二醇）/聚氨酯纳米复合材料是一种高度依赖界面的材料，具有独特的特性。首先，纳米颗粒的有机壳层使得能够简单地制备出分散性非常好的纳米复合材料，并将极大量的纳米颗粒（NP）掺入聚合物基体中。其次，纳米颗粒的化学和物理特性都决定了材料的力学行为。有机层的化学官能团——连接链末端的游离羟基——通过与基体形成共价键确保材料变硬，而处于熔融状态时则提供高柔韧性和可变形性，同时保持机械抗性。结果，低浓度区域的纳米复合材料显示出弹性模量和拉伸强度增加，总应变略有增加，而高浓度纳米复合材料则显示出弹性模量和拉伸强度降低，总应变大约翻倍。化学和物理官能团的结合确保了纳米颗粒与基体之间的高相容性，并允许生产重量百分比高于90%的高浓度纳米复合材料，使其成为一种具有粘性和柔韧性的材料，而不是脆性薄片。这种双功能效应是前所未有的，其结果为材料科学中各种应用的功能纳米材料定制开辟了广泛的新可能性。
