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相关概念视频

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
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在聚合物涂层中的厚度梯度是通过在固体基板上的反应层次组装在固体基板上进行的.

Sezer Özenler1,2, Ali Ata Alkan3, Ufuk Saim Gunay4

  • 1Department of Chemistry, Izmir Institute of Technology, Urla 35430, Izmir, Turkey.

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概括
此摘要是机器生成的。

本研究介绍了一种方法,使用层次组装创建精确的聚合物涂层厚度梯度 (0-20 nm). 关键参数,如化时间,度和基板倾斜控制梯度形成量身定制的材料特性.

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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Density Gradient Multilayered Polymerization DGMP: A Novel Technique for Creating Multi-compartment, Customizable Scaffolds for Tissue Engineering
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Density Gradient Multilayered Polymerization DGMP: A Novel Technique for Creating Multi-compartment, Customizable Scaffolds for Tissue Engineering

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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
  • 表面化学 表面化学

背景情况:

  • 精确控制聚合物涂层厚度对于先进的材料应用至关重要.
  • 渐变聚合物涂层提供可调整的表面性能,但需要强大的制造方法.

研究的目的:

  • 开发和描述一种简单,强大的方法,用于在聚合物涂层中创建纳米精度厚度梯度.
  • 调查关键参数对梯度形成的影响,并分析由此产生的表面特性.

主要方法:

  • 聚和聚乙胺在金基板上的反应层层组装.
  • 潜伏时间,聚合物度和基板倾斜角度的系统变化.
  • 使用原子力显微镜 (AFM),视角依赖红外光谱和光显微镜进行表征.

主要成果:

  • 以纳米精度达到从0-20nm的厚度梯度.
  • 证明表面粗度随着涂层厚度的增加而下降.
  • 观察到,随着厚度的增加,扬模量 (0.50到1.4MPa) 的增加,表明机械稳定性得到了增强.
  • 使用红外光谱学确定聚合物方向,并将光强度与涂层厚度相关联.

结论:

  • 开发的方法提供了对聚合物涂层厚度梯度的精确控制.
  • 制造过程是强大的,并依赖于快速反应动力学,以实现高效的层沉积.
  • 具有特征的梯度涂层具有可调节的纳米机械和表面性能,适合各种应用.