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相关概念视频

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K

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相关实验视频

Updated: Jun 28, 2025

Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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从物理交叉连接的同质关联聚合物制成的3D打印模块化软弹性体.

Myoeum Kim1, Shifeng Nian1, Daniel A Rau1

  • 1Soft Biomatter Laboratory, Department of Material Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, United States.

ACS polymers Au
|April 15, 2024
PubMed
概括

研究人员开发了新的软,可再加工的弹性体,用于使用关联聚合物进行3D打印. 这些材料使复杂结构的直接墨水写作 (DIW) 能够在没有溶剂或后处理的情况下实现,为先进的应用提供可调节的特性.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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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:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 增材制造 增材制造 增材制造

背景情况:

  • 弹性体的三维 (3D) 打印对于先进的设备至关重要.
  • 需要软,可再加工的弹性体,可以在没有溶剂或后处理的情况下打印.

研究的目的:

  • 开发模块化软弹性体,用于直接墨水写作 (DIW) 打印.
  • 为了实现3D打印弹性体的融化再加工和无溶剂制造.

主要方法:

  • 合成线性-关联性-线性 (LAL) 三块共聚物与基于胺基的键.
  • 通过关联性聚合物相互作用和块共聚合物自我组装利用物理交叉链接.
  • 使用高温DIW打印平台进行直接制造.

主要成果:

  • 开发了具有Young模块的弹性体,可从8kPa调整到8MPa.
  • 在整个模量范围内保持高拉力破裂应变 (约150%).
  • 通过DIW实现复杂,可变形的3D结构,无需溶剂或后处理.
  • 经过证明的化再加工能力,为DIW创造了可用的最软的材料.

结论:

  • LAL三块式共聚合物形成双交联网络,适合DIW打印.
  • 开发的弹性体为设计柔软,可融化回收材料提供了多功能平台.
  • 这项工作解决了对先进,易于加工的柔软弹性体材料的关键需求.