一个简单的一步路线,为激光烧结的聚合物粉引入功能
Eduards Krumins1, Liam A Crawford2, David M Rogers1
1School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK.
Nature communications
|April 11, 2024
概括
研究人员开发了一种可扩展的方法,使用超临界二氧化碳来功能化聚胺-12 (PA-12) 用于增材制造. 这一过程可以从PA-12材料中创建彩色和抗生物污染的3D打印物体.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 增材制造 增材制造 增材制造
背景情况:
- 聚胺-12 (PA-12) 由于其可加工性,主导激光烧结 (LS) 和增材制造 (AM).
- 目前在LS中的PA-12材料具有有限的颜色选择,容易产生生物污染.
- 需要具有成本效益的方法来增强PA-12的功能,用于AM应用.
研究的目的:
- 开发一种简单,干净,可扩展的方法来使PA-12具有功能.
- 为PA-12物体引入诸如颜色和抗生物污染能力之类的理想性质.
- 为了使功能化PA-12在商业增材制造设备中的使用.
主要方法:
- 使用超临界二氧化碳 (scCO2) 作为材料修饰的介质.
- 采用自由基聚合,将功能移植到PA-12上.
- 使用标准激光烧结设备证明了功能化PA-12的加工能力.
主要成果:
- 通过scCO2-介导的功能化过程成功创建了彩色PA-12材料.
- 开发了具有证明抗生物污染特性的PA-12材料.
- 功能化的PA-12材料与现有的商业激光烧结打印机兼容.
结论:
- 开发的方法提供了一个廉价和可扩展的途径,以使PA-12用于增材制造的功能化.
- 这种方法通过克服色彩和生物污染的局限性,显著扩大了PA-12在3D打印中的潜在应用.
- 功能化技术有望提高增材制造的能力.
相关概念视频
Cationic Chain-Growth Polymerization: Mechanism
2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
Polymers
35.7K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
35.7K
Step-Growth Polymerization: Overview
3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.5K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.3K
Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K


