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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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...
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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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.9K
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.
7.9K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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没有溶剂的环保方法来制备热可逆完全生物基弹性体.

Jie Yu1, Hui Yang1, Haijun Ji1

  • 1Beijing State Key Laboratory of Organic-Inorganic Composites & Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China.

ACS omega
|September 11, 2023
PubMed
概括

这项研究引入了一种新的可再加工的生物基弹性体,使用furfuryl甲基酸盐 (FMA). 开发的材料显示出出色的可回收性,在再加工后有超过90%的抗拉强度回收,为传统提供了可持续的替代品.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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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
  • 可持续材料 可持续材料

背景情况:

  • 由于不可逆转的火山化,石化制品面临资源短缺和回收挑战.
  • 可再加工和生物基弹性体的开发对于资源保护和环境可持续性至关重要.

研究的目的:

  • 通过使用furfuryl methacrylate (FMA) 合成和表征一种新的可再加工的生物基弹性体.
  • 研究FMA含量对弹性体结构和特性的影响.
  • 准备热可逆弹性体材料和复合材料,提高机械性能和可回收性.

主要方法:

  • 高温乳液聚合以合成聚二甲基酸乙二甲基酸二甲基酸 (PDBIMFA).
  • 福里埃变换红外 (FTIR) 和1H核磁共振 (NMR) 光谱用于结构特征.
  • 融化混合与双胺 (BMI) 作为交叉连接剂和碳黑 (CB) 作为强化填充剂,利用迪尔斯-阿尔德反应进行热可逆交叉连接.

主要成果:

  • 成功合成了基于FMA含量的PDBIMFA,具有基于FMA含量的调节性质.
  • 制备具有热可逆交联的PDBIMFA-BMI弹性体和CB/PDBIMFA-BMI复合材料.
  • 在两种材料的两次再加工周期后,实现了拉伸强度回收率超过90%.
  • 碳黑的证明增强作用,同时保持良好的再加工能力.

结论:

  • 开发的基于PDBIMFA的材料为可持续,可再加工的弹性体提供了一个有前途的途径.
  • 通过FMA和BMI的热可逆交叉连接的结合,为创造可回收替代品提供了一个战略.
  • 碳黑的添加增强了机械性能,而不会影响再加工能力,为先进的生物基复合材料铺平了道路.