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Polymer Classification: Stereospecificity01:26

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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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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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应变速率和热暴露对通过选择性激光烧结处理的聚胺 (PA12) 的影响

Chiara Morano1, Marco Alfano2, Leonardo Pagnotta1

  • 1Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, Italy.

Materials (Basel, Switzerland)
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概括

这项研究研究了排位率和热量如何影响3D打印聚胺 (PA12) 的机械性能. 选择性激光烧结 (SLS) 生产的零件,揭示了速率依赖性和加工后热处理对性能的部分影响.

关键词:
通过3D打印打印3D打印.机械性能 机械性能 机械性能尼龙是什么意思 尼龙是什么意思聚胺是一种聚胺.强度强度强度强度强度强度强度强度强度强度强度强度强热特性 热特性 热特性

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物工程 聚合物工程
  • 添加剂制造 添加剂制造 添加剂制造

背景情况:

  • 聚合物为运输行业提供轻量化解决方案,减少排放.
  • 增材制造 (AM) 能够实现传统方法无法实现的复杂几何形状.
  • 了解3D打印聚合物机械性能对于产品的性能和耐用性至关重要.

研究的目的:

  • 调查排位速度和热暴露对3D打印聚胺12 (PA12) 的机械特性的影响.
  • 为了评估PA12粉末和烧结材料的热性能.
  • 为了比较3D打印的PA12与其散装对应物的特性.

主要方法:

  • 选择性激光烧结 (SLS) 用于制造PA12标本.
  • 机械测试在各种位移速度下进行.
  • 使用差分扫描热量计 (DSC) 来分析热性质.
  • 对一些标本进行了加工后热处理.

主要成果:

  • 3D打印的PA12的机械性能表现出预期的速度依赖.
  • 处理后的热处理表明对机械行为的部分影响.
  • DSC分析为材料的热特性提供了洞察力.

结论:

  • 这项研究证实了3D打印PA12的机械性质的速度依赖性.
  • 后处理热处理可以修改,但不会完全改变机械性能.
  • 需要进一步的研究才能充分理解影响机械性能的微观结构变化.