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相关概念视频

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Polymers02:34

Polymers

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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...
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Polymers02:34

Polymers

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Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

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Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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如何表征超分子聚合物:一个用户指南

Yuhang Sheng1, Menglan Ma1, Shijun Li1

  • 1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Zhejiang Key Laboratory of Organosilicon Material Technology, Hangzhou Normal University, Hangzhou 311121, P. R. China.

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概括

由非共价键连接的超分子聚合物具有独特的动态特性. 本综述详细介绍了表征技术,强调了需要结合方法才能充分理解.

关键词:
超分子聚合物的高分子聚合物用X射线技术进行X射线检查.描述方法的表征方法.质谱仪的质谱学.显微镜 显微镜的使用非共价相互作用的非共价相互作用.核磁共振光谱仪 核磁共振光谱仪摄影光谱仪 摄影光谱仪自动组装的自动组装机超分子化学 超分子化学

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料化学 材料化学
  • 超分子化学 超分子化学

背景情况:

  • 超分子聚合物不同于传统的宏分子,利用可逆的,非共价相互作用.
  • 这些独特的纽带赋予了动态可逆性,刺激反应能力和自我愈合能力.
  • 对于传统的聚合物而言,已经确立的表征方法对于超分子系统来说是不够的.

研究的目的:

  • 系统地审查和总结目前用于超分子聚合物表征的方法.
  • 解决缺乏标准化和普遍适用的分析技术的问题.
  • 为该领域的研究人员提供全面的资源.

主要方法:

  • 核磁共振 (NMR) 光谱仪 (VC-NMR,VT-NMR,COSY,NOESY,ROESY,DOSY) 的使用情况.
  • 质谱学 (ESI,MALDI,APCI) 和光谱学 (UV-VIS,FL,CD,IR) 的研究.
  • 光散射 (DLS,SLS),X射线技术 (SC-XRD,SAXS,WAXS),显微镜 (AFM,SEM,TEM,CLSM) 和传统的聚合物方法 (SEC,VPO,TGA,DSC) 等.

主要成果:

  • 广泛的光谱,散射,显微镜和热分析技术适用.
  • 由于超分子系统的复杂性,没有单一的方法可以提供完整的描述.
  • 补充技术对于全面理解是必不可少的.

结论:

  • 超分子聚合物的全面表征需要采用多种技术的方法.
  • 结合各种方法,可以深入了解热力学,动力学,形态学和响应能力.
  • 对于这种新兴的材料类别,仍然需要标准化表征协议.