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相关概念视频

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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相关实验视频

Updated: Sep 13, 2025

Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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结构聚合物衍生陶复合材料通过近红外热立体石版.

Evelyn Wang1, Shruti Gupta2, Charles J Rafalko2

  • 1Department of Chemical Engineering, Michigan State University, East Lansing, Michigan 48824, United States.

ACS applied polymer materials
|July 31, 2025
PubMed
概括

接近红外的热立体石版印刷可以打印先进的聚合物衍生陶复合材料. 这种方法克服了UV印刷对高性能,轻质陶材料的局限性.

关键词:
3D NIR 热 SLA 是一个 3D NIR 热 SLA.添加剂制造 添加剂制造 添加剂制造机械性能 机械性能 机械性能聚合物衍生陶的聚合物衍生陶.碳化是碳化的重要组成部分.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 添加剂制造 添加剂制造 添加剂制造
  • 陶工程 陶工程 陶工程

背景情况:

  • 传统的紫外 (UV) 立体石刻 (SLA) 面临着复合树脂的挑战,包括有限的光透和低颗粒负载.
  • 这些局限性阻碍了具有理想性质的聚合物衍生陶 (PDC) 复合材料的制造.

研究的目的:

  • 开发一种近红外 (NIR) 热SLA技术,用于打印2.5D结构PDC复合材料.
  • 为了克服基于UV的印刷在PDC复合材料中高SiC颗粒负载的局限性.

主要方法:

  • 利用NIR激光器进行空间控制的热能传递,在反应性树脂池中诱导局部聚合.
  • 使用聚合物透和热解 (PIP) 进行后处理,以加密和强化印刷样品.
  • 加入了预陶聚合物,形成一个Si-O-Cx支网络,用于在加工过程中保持结构完整.

主要成果:

  • 在5次PIP循环后,达到74.3 ± 13.7 MPa的屈曲强度和2.31 g/cm3的密度.
  • 制造的2.5D网格设计,包括蜂结构,其压力强度为32.8±11.2 MPa,有效密度低1.07 g/cm3.
  • 成功打印了具有高SiC颗粒载荷的PDC复合材料,克服了以前的材料限制.

结论:

  • NIR热SLA是制造高性能2.5D PDC复合材料的可行方法.
  • 开发的技术提供了改进的机械性能,并使轻量化结构设计成为可能.
  • 这种方法扩大了先进陶复合材料制造的可能性.