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相关概念视频

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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...

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相关实验视频

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

来自催化乳液聚合物的亚微米聚乙烯颗粒.

Florian M Bauers1, Ralf Thomann, Stefan Mecking

  • 1Institut für Makromolekulare Chemie und Freiburger Materialforschungszentrum der Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 31, D-79104 Freiburg, Germany.

Journal of the American Chemical Society
|July 17, 2003
PubMed
概括

通过乳液聚合合成的线性聚乙烯颗粒表现出独特的状形状和状结构. 这种方法导致在微米以下的水滴中形成明显的结晶行为,与散装聚乙烯不同.

科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 线性聚乙烯颗粒通常通过散装聚合制成.
  • 催化乳液聚合提供了合成聚乙烯纳米颗粒的替代途径.
  • 了解这些纳米粒子的形态和结晶对于它们的应用至关重要.

研究的目的:

  • 通过催化乳液聚合合成的线性聚乙烯颗粒的形态和结构的特征.
  • 为了研究这些纳米粒子在乳液聚合过程中的结晶行为.
  • 为了比较结晶过程与传统的散装聚乙烯.

主要方法:

  • 传输电子显微镜 (TEM) 检测粒子形态和叶片厚度.
  • 原子力显微镜 (AFM) 用于粒子尺寸和面积比.
  • 乙烯的催化乳液聚合.

主要成果:

  • 聚乙烯颗粒呈现出非球形,状的形状,平均面积比约为10.
  • 粒子在它们较短的轴上呈现了状堆叠,有些粒子由单片组成.
  • 叶片厚度在9-11nm之间,受聚合温度的影响.
  • 发生了亚微米滴的单个结晶,导致显著的超冷却 (约55°C).

更多相关视频

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
07:01

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Published on: January 25, 2018

相关实验视频

Last Updated: Jun 2, 2026

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
07:01

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Published on: January 25, 2018

结论:

  • 催化乳液聚合产生独特的形聚乙烯纳米颗粒,具有明显的层状结构.
  • 乳液聚合物的结晶过程的特点是独立的滴滴结晶和大量的超冷却.
  • 这些发现为纳米粒子形成和聚合过程中的结晶机制提供了洞察力.