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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.4K
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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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

2.9K
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.
2.9K
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...
2.6K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.4K
Polymers02:34

Polymers

34.3K
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...
34.3K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.1K

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简化聚合物粒子设计:使用块共聚合物创建多空洞结构.

Netnapha Kamlangmak1, Thitirat Rattanawongwiboon2, Hideto Minami3

  • 1Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani 12110, Thailand.

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概括

研究人员开发了多功能多空聚合物颗粒,使用区块共聚合物作为原体. 这些颗粒具有出色的吸附性和可重复使用性,可用于各种应用.

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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

背景情况:

  • 开发新的聚合物架构对于先进的材料应用至关重要.
  • 多孔聚合物颗粒由于其内部结构而具有独特的特性.

研究的目的:

  • 为了合成使用块共聚合物作为体的多孔聚合物颗粒.
  • 描述合成颗粒的结构,多孔性和吸附能力.

主要方法:

  • 通过溶液转移聚合来合成的聚二甲基胺乙基甲基酸) -块聚甲基酸 -三甲基酸 -三甲基酸) (PDMAEMA-b-P) -MMA-MPS).
  • 使用区块共聚合物作为微悬浮聚合乙烯基醇二甲基酸盐 (EGDMA) 和乙基甲基酸盐 (HEMA) 的基聚合物.
  • 使用扫描电子显微镜 (SEM) 和使用布鲁纳乌尔埃梅特特勒 (BET) 分析的孔隙性进行了粒子形态的特征.

主要成果:

  • 在24小时内实现了99%的单体转化,这表明聚合过程顺利进行.
  • SEM证实了多孔聚合物颗粒结构的形成.
  • BET分析显示了明确的多孔性,染料吸附性研究证实了水和油阶段的高效性能.
  • 在经过10个重复使用周期后,颗粒保持了超过80%的吸附效率.

结论:

  • 通过使用块共聚合物作为原体,建立了一种简单而通用的方法来生产多孔聚合物颗粒.
  • 合成的多孔P(EGDMA-HEMA) 颗粒显示出有前途的吸附性能和可重复使用性.
  • 该技术为创建各种应用的先进聚合物材料提供了可行的途径.