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首页> 外文期刊>Journal of Applied Polymer Science >Shape-Memory Polymer Networks with Fe_3O_4 Nanoparticles for Remote Activation
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Shape-Memory Polymer Networks with Fe_3O_4 Nanoparticles for Remote Activation

机译：具有Fe_3O_4纳米粒子的形状记忆聚合物网络用于远程激活

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Shape-memory polymers (SMPs) have recently shown the capacity to actuate by remote heating via the incorporation of magnetic nanoparticles into the polymer matrix and exposure to an alternating magnetic field. In this study, methacrylate-based thermoset SMP networks were synthesized through free-radical polymerization with varying amounts of Fe_3O_4 magnetite (0, 1, and 2.5 wt %). Furthermore, the chemistry of the networks was controlled to maintain a constant glass transition temperature (T_g)while varying the degree of chemical crosslinking. Remote heating of the networks was shown to be a direct function of the nanoparticle concentration and independent of the chemistry. Magnetite reinforcement was shown to influence the thermomechanical properties of the networks; increasing Fe_3O_4 concentrations led to decreases in T_g and rubbery modulus. However, networks with a higher degree of crosslinking were more resistant to thermomechanical changes with respect to magnetite concentration. Strain to failure was shown to decrease with the addition of nanoparticles and the free-strain shape-memory cycle was investigated for all of the networks. Networks with lower degrees of crosslinking and high magnetite concentrations showed a significant amount of irrecoverable strain. Last, the use of remotely heated shape-memory materials is discussed in light of potential biomedical applications.
机译：形状记忆聚合物（SMP）最近显示出通过将磁性纳米颗粒掺入聚合物基质并暴露于交变磁场而通过远程加热来激活的能力。在这项研究中，通过自由基聚合与不同量的Fe_3O_4磁铁矿（0、1和2.5 wt％）合成了基于甲基丙烯酸酯的热固性SMP网络。此外，控制网络的化学反应以保持恒定的玻璃化转变温度（T_g），同时改变化学交联度。网络的远程加热被证明是纳米颗粒浓度的直接函数，并且与化学反应无关。研究表明，磁铁矿增强会影响网络的热机械性能。 Fe_3O_4浓度的增加导致T_g和橡胶模量的降低。但是，具有较高交联度的网络相对于磁铁矿浓度更能抵抗热机械变化。结果表明，随着纳米颗粒的加入，失效应变降低，并且对所有网络的自由应变形状记忆循环进行了研究。交联度较低且磁铁矿浓度较高的网络显示出大量不可恢复的应变。最后，根据潜在的生物医学应用讨论了远距离加热的形状记忆材料的使用。

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