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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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完全可混合的聚乙烯纳米复合材料.

Matthias Bieligmeyer1, Sara Mehdizadeh Taheri, Ian German

  • 1Physikalische Chemie I, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany.

Journal of the American Chemical Society
|October 23, 2012
PubMed
概括

完全混合的聚乙烯纳米复合材料是使用聚合物刷涂层纳米颗粒制成的. 这些增强了材料的质量.

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Last Updated: May 17, 2026

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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07:41

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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
  • 纳米技术纳米技术

背景情况:

  • 开发完全可混合的聚合物纳米复合材料是具有挑战性的,因为纳米粒子聚合.
  • 聚乙烯 (PE) 纳米复合材料往往由于分散不良和缺乏混合性而受到影响.
  • 控制纳米粒子分散是理解和改进材料性能的关键.

研究的目的:

  • 建立一种制造完全可混合聚乙烯 (PE) 纳米复合材料的方法.
  • 系统地研究PE纳米复合材料的热力学特性.
  • 了解聚合物涂刷纳米颗粒在PE混合性和性质中的作用.

主要方法:

  • 合成聚合物刷涂层纳米粒子.
  • 在不同比例下将纳米粒子与聚乙烯 (PE) 混合.
  • 描述纳米复合材料的热力学特性 (储存模量,软化温度,融粘度).
  • 在纳米颗粒的存在下分析PE的结晶行为.

主要成果:

  • 实现了完全混合的PE纳米复合材料,具有均的分散,没有聚合.
  • 观察到储存模量和软化温度与纳米颗粒含量的显著增加.
  • 在添加纳米颗粒时,没有发现融粘度的改变.
  • 证明PE涂层纳米粒子作为PE结晶的核化剂.

结论:

  • 聚合物刷涂层纳米颗粒提供了一条通往与半晶聚合物完全混合的纳米复合材料的通道.
  • 涂PE的纳米粒子通过促进PE结晶来增强固态中的热力学特性.
  • 这种方法克服了聚合问题,使纳米复合材料特性能够进行系统研究.