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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

Polymers

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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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基于基的新型功能性非性CO2聚碳酸盐:合成和特性

Nikita M Maximov1, Sergey A Rzhevskiy2, Andrey F Asachenko1,2

  • 1Faculty of Chemistry, Lomonosov Moscow State University, Lenin Hills, 1, bld. 3, 119991 Moscow, Russia.

International journal of molecular sciences
|October 29, 2025
PubMed
概括

新型功能性聚碳酸盐通过环开放式共聚合物合成. 这些新材料,poly ((solketal glycidyl ether carbonate-co-propylene carbonate),具有可调节的特性,并且在去除保护后更容易降解.

关键词:
聚碳酸盐是一种聚碳酸盐.化) CoIIIX复合体的复合物.环开放式共聚合.

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科学领域:

  • 聚合物化学 聚合物化学
  • 有机合成 有机合成
  • 材料科学 材料科学 材料科学

背景情况:

  • 开发具有可控性质的功能性聚碳酸对于先进的材料应用至关重要.
  • 环开聚合为合成复杂的聚合物架构提供了一种多功能途径.
  • 催化系统是实现高选择性和对聚合物特性控制的关键.

研究的目的:

  • 通过环开 copolymerization 合成新的功能性聚碳酸盐,聚 ((solketal glycidyl 以太碳酸盐-co-propylene 碳酸盐).
  • 为了研究反应条件的影响,如添加水,在聚合物分子重量分布.
  • 探索合成的基功能聚碳酸盐的特性和循环聚合行为.

主要方法:

  • 索尔基特糖乙烯,氧化物和二氧化碳的环开放共聚合.
  • 催化使用rac- ((salcy) CoIIIX复合物和bis ((triphenylphosphine) 微盐.
  • 酸性水解用于去除索尔基特组的保护.

主要成果:

  • 获得了从2 × 104到1 × 105的数值平均分子重量和狭窄的双模分离分子重量分布 (分散度为1.02-1.07) 的聚合物.
  • 添加水导致具有单模分布 (分散率为1.11) 的聚合物.
  • 基功能性聚碳酸盐表现为无形性质,Tg接近或低于室温,并在较温和的条件下经历了循环聚合.

结论:

  • 新型功能性聚碳酸盐在受控的分子重量和分布下成功合成.
  • 基团的存在增加了聚碳酸盐的可降解性.
  • 这些材料有可能用于需要可降解和功能性聚合物的应用.