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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.7K
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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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.
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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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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相关实验视频

Updated: Jan 10, 2026

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
09:22

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Published on: August 28, 2015

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完全线性α,ω-基终结聚乙烯具有近乎理想的晶度.

Naganath Patil1, Noor Albarbari1, Nikos Hadjichristidis1

  • 1Polymer Synthesis Laboratory, Chemistry Program, KAUST Catalysis Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.

Angewandte Chemie (International ed. in English)
|November 21, 2025
PubMed
概括
此摘要是机器生成的。

一种新的启动剂,1,5-(bis-borinane) (1,5-BBP),使C1聚合能够产生具有异常结晶性的高度线性聚甲 (PM). 这一突破解决了先进材料应用中合成无缺陷聚合物的重大挑战.

关键词:
这是一个双功能启动器.在C1的聚合物化过程中.接近理想的结晶度.完美的线性链条 完美线性的链条聚乙烯聚乙烯的使用方法

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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相关实验视频

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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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
  • 有机合成 有机合成

背景情况:

  • 合成完美线性聚乙烯 (PE) 和其类似物,如聚甲 (PM),由于分支缺陷而具有挑战性.
  • 这些缺陷阻碍了叶片包装,降低了结晶性,并限制了材料的特性.
  • 现有的C1聚合方法难以实现高线性和受控的聚合物架构.

研究的目的:

  • 开发一种新型的多同质化 (C1聚合) 启动器,以合成明确的α,ω-基聚甲 (PM).
  • 实现前所未有的对分子质量,多分散性和PM的线性控制.
  • 为了研究以最小化分支合成的PM的特性.

主要方法:

  • 开发和应用一种用于C1聚合的新型1,5-(bis-borinane) (1,5-BBP) 启动剂.
  • 对二甲基硫甲基化物实施单体净化策略,以减少分支.
  • 使用H NMR,B NMR,MALDI-TOF MS,SEC,定量C NMR,DSC,WAXS和固态2D NMR进行表征.

主要成果:

  • 在高温下成功合成了具有可控摩尔质量和狭窄多分散性的α,ω-基终结PM.
  • 在PM中实现了低于0.04%的残留分支,通过定量C NMR证实了这一点,这与以前的方法相比显著改善.
  • 由此产生的颗粒物呈现出异常高的结晶度 (高达99.1%),化温度 (高达143.15°C) 和聚变度 (高达290 J·g-1).

结论:

  • 新的1,5-BBP启动器和单体净化策略使得通过C1聚合合成高度线性PM的合成成为可能.
  • 对启动器设计,单体纯度和反应条件的精确控制是实现聚合物晶度理论极限的关键.
  • 这项工作为具有优越的热和机械性能的高级聚合物材料提供了一条途径,这是由于增强的结晶性.