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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Factors Affecting Activity Coefficient01:17

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The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
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Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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离子导电性和基于固体类PEO的聚合物电解质的机械性能之间的相关性.

Agathe Naboulsi1,2,3, Ronan Chometon2,3,4, François Ribot2

  • 1LPPI, CY Cergy Paris Université, F-95000 Cergy, France.

ACS applied materials & interfaces
|March 11, 2024
PubMed
概括

本研究探讨了用于固态电池的基于聚乙烯糖醇的聚合物网络. 更高的聚合物灵活性和更低的交叉连接密度提高了离子导电性,这对电池性能至关重要.

关键词:
交联聚合物网络的交联聚合物网络.机械性能 机械性能 机械性能一个单离子导体导体.固体聚合物电解质的电解质运输号码 运输号码

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科学领域:

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

背景情况:

  • 聚乙烯甘甲基乙甲酸聚合物网络 (基于PEO的网络) 是金属所有固态电池的有前途的电解质.
  • 提高对其物理化学特性的理解对于满足电池电解质要求至关重要.

研究的目的:

  • 研究交叉连接密度和乙烯氧化物/比对 PEO 网络的机械性能和离子导电性的影响.
  • 对优化固体聚合物电解质 (SPEs) 和单离子SPEs (si-SPEs) 的机械性能进行离子导电的相关性.

主要方法:

  • 合成基于PEO的交联聚合物 (si-SPEs和SPEs) 使用无溶剂基共聚合.
  • 使用的3-[三甲) 硫胺硫]甲酸盐 (LiMTFSI),聚乙烯糖醇) 甲基乙醇甲酸盐 (PEGM) 和聚乙烯糖醇) 二甲酸盐 (PEGDM).
  • 纳入 LiTFSI 作为 SPEs 中的离子物种.

主要成果:

  • 大多数合成的聚合物薄膜是无形的,自立的,灵活的,均的和热稳定的.
  • 在SPE和si-SPE系列中观察到离子导电性和机械性能之间存在很强的相关性.
  • 离子导电性随着玻璃过渡温度,α放松温度和储存模量下降而增加.

结论:

  • +运输受到聚合物链灵活性和+/EO相互作用的显著影响.
  • 在基于PEO的网络中,降低机械刚性和增加链的流动性提高了离子导电性.
  • 这些发现为设计用于金属电池的先进固体聚合物电解质提供了洞察力.