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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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.
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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 polymer...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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相关实验视频

Updated: Jun 14, 2026

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
09:02

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

来自块聚合物前体的纳米孔状线性聚乙烯.

Louis M Pitet1, Mark A Amendt, Marc A Hillmyer

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Journal of the American Chemical Society
|April 2, 2010
PubMed
概括
此摘要是机器生成的。

通过使用块聚合物,为离子电池制造新的纳米孔聚合物膜. 这些膜提供了量身定制的多孔性和出色的化学耐药性,这对于先进的电池技术至关重要.

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 电化学 电化学 电化学

背景情况:

  • 多孔聚烯膜对于离子电池至关重要,作为隔离器,防止短路.
  • 具有牺牲组件的块聚合物是通过自我组装和选择性去除来创建纳米孔膜的有希望的前体.

研究的目的:

  • 合成和表征新型区块聚合物,用于为离子电池应用制造量身定制的纳米孔膜.
  • 研究这些膜的结构-性质关系,重点关注孔隙性,机械强度和化学抗性.

主要方法:

  • 使用环开聚合物的块聚合物的合成,用聚烯 (PLA) 作为牺牲成分和线性聚乙烯 (LPE) 作为矩阵.
  • 使用吸附和扫描电子显微镜对形态和多孔性的表征.
  • 通过拉力测试评估机械性能,通过暴露于缩强酸的化学耐受性进行测试.

主要成果:

  • 成功合成了LPE-PLA块共聚合物,在广泛的组成范围内形成双连续形态.
  • 选择性去除PLA产生的半晶体LPE纳米孔膜与相互连接的空隙 (<100 nm孔隙).
  • 由此产生的膜表现出出色的机械强度和出色的化学抗强酸性.

结论:

  • 块共聚合物提供了一种多功能途径,用于为先进的电池分离器设计具有可调节性质的纳米多孔聚合物膜.
  • 开发的基于LPE的纳米孔膜显示了提高离子电池安全性和性能的巨大潜力.