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Temperature-controlled reversible pore size change of electrospun fibrous shape-memory polymer actuator based meshes

机译：电纺纤维形状记忆聚合物致动器网啮合的温度控制可逆孔径变化

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Fibrous membranes capable of dynamically responding to external stimuli are highly desirable in textiles and biomedical materials, where adaptive behavior is required to accommodate complex environmental changes. For example, the creation of fabrics with temperature-dependent moisture permeability or self-regulating membranes for air filtration is dependent on the development of materials that exhibit a reversible stimuli-responsive pore size change. Here, by imbuing covalently crosslinked poly(epsilon-caprolactone) (cPCL) fibrous meshes with a reversible bidirectional shape-memory polymer actuation (rbSMPA) we create a material capable of temperature-controlled changes in porosity. Cyclic thermomechanical testing was used to characterize the mechanical properties of the meshes, which were composed of randomly arranged microfibers with diameters of 2.3 +/- 0.6 mu m giving an average pore size of approx. 10 mu m. When subjected to programming strains of epsilon(m) = 300% and 100% reversible strain changes of epsilon(rev)' = 22% +/- 1% and 6% +/- 1% were measured, with switching temperature ranges of 10 degrees C-30 degrees C and 45 degrees C-60 degrees C for heating and cooling, respectively. The rbSMPA of cPCL fibrous meshes generated a microscale reversible pore size change of 11% +/- 3% (an average of 1.5 +/- 0.6 mu m), as measured by scanning electron microscopy. The incorporation of a two-way shape-memory actuation capability into fibrous meshes is anticipated to advance the development and application of smart membrane materials, creating commercially viable textiles and devices with enhanced performance and novel functionality.
机译：能够在纺织品和生物医学材料中受到能够动态响应外部刺激的纤维膜，其中需要适应性行为以适应复杂的环境变化。例如，具有用于空气过滤的温度依赖性湿度渗透性或自调节膜的织物的产生取决于表现出可逆刺激响应性孔径变化的材料的发育。这里，通过利用具有可逆双向形状记忆聚合物致动（RBSMPA）的可逆双向形状记忆聚合物致动（RBSMPA）的纤维网，我们产生能够温度控制的孔隙率变化的材料。循环热机械测试用于表征网眼的机械性能，其由随机排列的微纤维组成，直径为2.3 +/-0.6μm，其占平均孔径约为。 10亩。当受到ε（m）的编程菌株时，测量ε（Rev）'= 22％+/- 1％和6％+/- 1％的300％和100％可逆应变变化，开关温度范围为10用于加热和冷却，分别为C-30摄氏度和45摄氏度的45摄氏度。通过扫描电子显微镜测量，CPCL纤维网的CPCL纤维网的RBSMPA产生11％+/- 3％（平均为1.5 +/-0.6μm）的微观可逆孔径。预计将双向形状记忆致动能力掺入纤维网格中，以推进智能膜材料的开发和应用，从而创建具有增强性能和新功能的商业可行纺织品和器件。

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