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在编程过程中压缩形状记忆聚氨泡的4D打印工具.

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关键词:
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 添加剂制造 添加剂制造 添加剂制造

背景情况:

  • 形状记忆聚合物 (SMPs) 的受控变形,特别是圆柱形的聚合物,存在重大挑战.
  • 现有的强力应用方法缺乏准确性,用于对圆柱状SMP样品进行均压缩.

研究的目的:

  • 开发一种基于材料的解决方案,用于使用四维 (4D) 打印来控制SMP的变形.
  • 通过一种新的工具方法使圆柱形SMP泡样本能够进行均的压缩.

主要方法:

  • 使用化丝制造 (FFF) 来4D打印一个由聚氨 (PEU) 制成的热敏工具.
  • 采用差异扫描热度计 (DSC) 来确定PEU的玻璃化过渡温度 (Tg) 和聚尿 (PEUU) 的化行为.
  • 在4D打印工具中集成了一个激光切割的PEUU泡筒,通过热循环进行压缩和形状固定.

主要成果:

  • 4D打印的PEU工具在加热到75°C时成功压缩了PEU泡样本,转移了内部应力.
  • 压缩泡的形状在冷却到-15°C时被固定,并在23°C下保持其编程形状900天.
  • 再加热至75°C成功恢复了PEUU泡的原始形状,证明了形状记忆恢复.

结论:

  • 4D打印提供了一种可行的材料方法,用于创建定制的热敏工具,用于精确的SMP编程.
  • 这种技术克服了变形圆柱形SMP的局限性,为复杂形状编程铺平了道路.
  • 未来的应用包括各种4D打印工具几何结构,用于编程各种SMP和其他可编程材料.