Fiber Reinforced Soft Composites with Tunable Extensibility, Stiffness, and Strength for Synthetic Bio-tissue Applications

具有可调延展性、刚度和强度的纤维增强软复合材料，适用于合成生物组织应用

• 批准号: 20K20193
• 负责人: キング ダニエル
• 金额: $ 2.41万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-01 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K20193/
• 关键词: Biomaterials; Tunability; Composites; Toughness; Stretchability; Bio-inspiration; Hydrogels

We have developed a method to incorporate wrinkled fabric structures into elastomer composites with controlled wavelength. 3D printing is used to create molds with controlled shape. Fabric is compressed between these molds, and then the edges of the fabric are immersed in melted wax. When the wax solidifies, the fabric can be removed from the mold, and the fabric maintains the imposed wrinkled structure. The wrinkled fabric is then placed into a reactor, and pre-polymer solution is injected and exposed to UV light, to synthesize the elastomer. Finally a laser cutter is used to cut the sample to the desired shape. The proposed method works well to design extensible fabric-reinforced soft materials.These samples have been mechanically characterized, and the resulting properties are unique compared to regular soft materials. The incorporation of a wrinkled structure of fabric introduced a new transition point during tensile testing. Initial stress-strain behavior appears linearly elastic, closely matching that of the matrix. A transition strain occurs, where the composite quickly becomes stiff, and the modulus in this region approaches that of the fabric. The strain at which this transition occurs is controlled by the wrinkled fabric structure. We have demonstrated that we can cause this transition to occur at strains ranging from 5-30%. This simple method allows for fabrication of J-shaped composites, similar to natural biomaterials.

我们已经开发了一种将皱纹的织物结构结合到具有控制波长的弹性体复合材料中的方法。 3D打印用于创建具有控制形状的模具。织物在这些模具之间被压缩，然后将织物的边缘浸入融化的蜡中。当蜡固化时，可以从模具中除去织物，并保持织物的皱纹结构。然后将皱纹的织物放入反应器中，并注入前聚合物溶液并暴露于紫外线，以合成弹性体。最后，使用激光切割器将样品切成所需的形状。所提出的方法非常适合设计可扩展的织物增强软材料。这些样品已经机械地表征了这些样品，与常规软材料相比，所得的特性是独一无二的。结合织物的结构在拉伸测试期间引入了一个新的过渡点。初始应力 - 应变行为似乎是线性弹性的，与基质的弹性匹配。发生过渡应变，其中复合材料迅速变硬，该区域中的模量接近织物的模量。这种过渡发生的应变由皱纹的织物结构控制。我们已经证明，我们可以导致这种过渡在5-30％之间发生。这种简单的方法允许制造与天然生物材料相似的J形复合材料。