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相关概念视频

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
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温度直角的动态聚合物网络.

Matthias Udo Mayer-Kriehuber1,2, Evelyn Sattler1, David Reisinger1,2

  • 1Polymer Competence Center Leoben GmbH Sauraugasse 1 A-8700 Leoben Austria sandra.schloegl@pccl.at sandra.schloegl@unileoben.ac.at.

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概括
此摘要是机器生成的。

在共价适应性聚合物网络 (CAN) 中的潜在催化剂可以实现快速再加工. 本研究介绍了用于独立,温度控制的切换的双热催化剂,允许用于先进制造的可编程材料特性.

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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
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 共价适应性聚合物网络 (CAN) 为再加工提供了动态性质.
  • 潜伏催化剂,特别是热催化剂,对于控制的网络激活至关重要.
  • 现有的保温系统往往缺乏对激活和关闭温度的独立控制.

研究的目的:

  • 系统地调查具有明显温度配置的热基发电机 (TBG).
  • 量化评估催化剂激活/失活对动态乙烯光聚合物中应力松的影响.
  • 在单一的CAN系统中开发和演示温度对角催化.

主要方法:

  • 基于酸盐和酸盐的TBGs的合成和表征.
  • 在动态乙烯光聚合物上进行定量应力松测量.
  • 用于直角催化,TBG与不重叠的热形状的组合.
  • 使用数字光处理3D打印制造多重修复物体的制造.

主要成果:

  • 基于酸和酸盐的TBG的激活和失活温度是不同的.
  • 两个催化剂的独立运行使得四个不同的债券交换制度能够完全通过温度控制.
  • 证明了材料性质的可逆,多循环切换.
  • 成功制造了多重修复的3D打印组件.

结论:

  • 使用双隐性催化剂的温度直角催化在CAN中是可行的.
  • 这种方法将材料稳定性与再加工要求分开.
  • 为需要可编程机械响应的应用提供了多功能平台,包括软机器人和可切换粘合剂.