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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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相关实验视频

Updated: Jun 25, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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具有光热响应的素基聚氨具有机械坚固性,快速自我愈合,固态可塑性和形状记忆性能.

Xiaochun Liu1, Zhiyi Huang1, Jianxin Wu1

  • 1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.

International journal of biological macromolecules
|May 22, 2024
PubMed
概括

研究人员开发了一种具有光热反应的新型基于素的聚氨 (DLPU). 这种可持续材料在近红外辐射下表现出了显著的自我愈合和形状变化的特性.

关键词:
在Lignin的基础上.有光热反应的光热反应.聚氨是一种聚氨.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 可持续材料 可持续材料

背景情况:

  • 对石油化学资源枯竭和环境污染的日益担忧,需要可持续的材料替代品.
  • 是天然生物质成分,为开发功能性材料提供了一个有前途的可再生资源.

研究的目的:

  • 开发一种对光热有反应性的基于素的聚氨 (DLPU).
  • 通过受控的纽带动力学,向DLPU传授自我愈合和形状转变的能力.

主要方法:

  • 在聚氨网中加入红素和氧化碳酸盐键.
  • 使用近红外 (NIR) 辐射触发光热效应.
  • 机械性能,光热转换效率和响应性行为的表征.

主要成果:

  • 该DLPU显示出出色的机械强度 (30.2 MPa) 和性 (118.7 MJ·m−3).
  • 高光热转换效率 (54.4%) 实现了高效的自我愈合 (96.0% 拉伸强度恢复) 和形状记忆效应 (98.8% 固定性,95.3% 恢复).
  • 尼尔射线照射激活了氧化碳酸盐和键的可逆动态,导致光控制的可塑性和形状变化.

结论:

  • 开发的DLPU是一种多功能,灵敏的材料,具有利用高价值木质素的巨大潜力.
  • 这项研究为创造具有可调自愈和形状记忆功能的先进聚氨提供了可持续的途径.