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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.6K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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在triblock共聚物中,结晶和微相分离之间的竞争和合.

Shichu Yang1, Zhihao Shen1, Xing-He Fan1

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.

Macromolecular rapid communications
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概括

块共聚合物与液晶和半晶块自组装成状和六角结构. 聚合物结晶显著影响纳米结构的形成,导致独特的相位过渡.

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区块共聚物的区块共聚物.结晶化 结晶化的过程.较低的混乱 - 顺序过渡.微相分离的微相分离方法半晶体聚合物半晶体聚合物

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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
  • 纳米技术 纳米技术

背景情况:

  • 块共聚合物 (BCP) 自组装成各种纳米结构.
  • 结合液晶 (LC) 和半晶体聚合物修改了BCP的自组装.
  • 半导体外套LC聚合物 (MJLCPs) 具有独特的特性.

研究的目的:

  • 合成和描述含有聚甲基素 (PDMS),聚L-乳酸 (PLLA) 和PMVBPLC块的新型BCP.
  • 研究PLLA结晶对BCP纳米结构形成的影响.
  • 探索温度依赖的相位行为和过渡.

主要方法:

  • 三阻抗共聚合物的合成 (PDMS-b-PLLA-b-PMVBP).
  • 温度依赖的小角度X射线散射 (SAXS) 用于结构分析.
  • 分析相位转换和纳米结构的演变.

主要成果:

  • 双块共聚合物PLLA-b-PMVBP由于具有相似的可溶性参数,没有显示有序的纳米结构.
  • 在环境温度下,triblock共聚合物PDMS-b-PLLA-b-PMVBP呈现出状 (LAM),在高温下呈现出六角形 (HEX).
  • PLLA结晶显著影响了BCP自组装,可能与微相分离竞争或合.
  • 观察到一种罕见的下层障碍 - 顺序过渡 (LDOT).

结论:

  • 聚合物结晶和微相分离之间的相互作用支配了BCP纳米结构.
  • 观察到温度诱导的结构转变 (LAM到HEX).
  • 包括LDOT在内的新阶段行为突出显示了使用功能块自组装BCP的复杂性.