Latex films that are formed by evaporating dispersions in the absence of volatile organic compounds (VOCs) typically suffer from poor mechanical strength compared to solution-cast latex films. In our previous work, we discovered that this disadvantage can be overcome by using microspheres crosslinked with rotaxanes, which consist of a crown ether wheel and an axle. In the present study, to obtain tougher latex films, we investigated the relationship between the mechanical properties and the nanostructures of films prepared at different film-formation temperatures (FFT), i.e., FFTs above and below the glass-transition temperatures ( T g ) of the microspheres. Tensile tests revealed that the films showed the highest fracture energies when the film was formed at a temperature higher than the T g of the microspheres and followed by annealing. In addition, the interfacial thickness ( t inter ), which is an indicator of the magnitude of the relationship between the t inter of neighboring microspheres, was correlated with the fracture energy as a function of annealing time. Thus, tough latex films could be obtained without the use of any additives by increasing the FFT during the formation and subsequent annealing of the film. This study may lead to new applications, e.g., VOC-free coatings for biomaterials. Latex films typically suffer from poor mechanical strength compared to solution-cast latex films. In the present study, to obtain tougher latex films, we investigated the relationship between the mechanical properties and the nanostructures of films prepared at different film-formation temperatures (FFTs), i.e., FFTs above and below the glass-transition temperatures ( T g ) of the microspheres. Tensile tests revealed that the films showed the highest fracture energies when the film was formed at a temperature higher than the T g of the microspheres and followed by annealing.

中文翻译：

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由聚（丙烯酸丁酯-共聚甲基丙烯酸甲酯）微球制备的不含挥发性有机化合物的乳胶膜的结构与机械强度之间的温度依赖性关系

与溶液浇铸乳胶薄膜相比，在不存在挥发性有机化合物 (VOC) 的情况下通过蒸发分散体形成的乳胶薄膜通常具有较差的机械强度。在我们之前的工作中，我们发现可以通过使用与轮烷交联的微球来克服这一缺点，该微球由一个冠醚轮和一个轴组成。在本研究中，为了获得更坚韧的乳胶膜，我们研究了在不同成膜温度 (FFT) 下制备的薄膜的机械性能与纳米结构之间的关系，即高于和低于玻璃化转变温度 (T g ) 的 FFT的微球。拉伸试验表明，当薄膜在高于微球 T g 的温度下形成并随后退火时，薄膜显示出最高的断裂能。此外，界面厚度 (t inter ) 是相邻微球之间 t inter 关系大小的指标，与作为退火时间函数的断裂能相关。因此，通过在薄膜的形成和随后的退火过程中增加 FFT，可以在不使用任何添加剂的情况下获得坚韧的乳胶薄膜。这项研究可能会带来新的应用，例如用于生物材料的无 VOC 涂层。与溶液流延胶乳膜相比，胶乳膜通常具有较差的机械强度。在本研究中，为了获得更坚韧的乳胶膜，我们研究了在不同成膜温度 (FFT) 下制备的薄膜的机械性能与纳米结构之间的关系，即，FFT 高于和低于微球的玻璃化转变温度 (T g )。拉伸试验表明，当薄膜在高于微球 T g 的温度下形成并随后退火时，薄膜显示出最高的断裂能。