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相关概念视频

Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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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...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Types of Step-Growth Polymers: Polyesters01:20

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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.
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相关实验视频

Updated: Jun 22, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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可伸缩的多二氧化弹性体

Kai Liu1,2, Xinhai Zhang1, Dong Zhao1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China.

Fundamental research
|June 27, 2024
PubMed
概括
此摘要是机器生成的。

机械互锁聚合物 (MIP) 为先进的弹性体提供了独特的分子运动. 这项研究引入了由于集成的机械键增强了机械性能的可拉伸的聚二氧化弹性体 (PREs).

关键词:
动态材料是一种动态材料.弹性体 弹性体 弹性体机械上相互锁定的分子.机械互锁的高分子.聚罗塔克桑酸是一种多氧化物.

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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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相关实验视频

Last Updated: Jun 22, 2025

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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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
  • 超分子化学 超分子化学

背景情况:

  • 机械互锁聚合物 (MIP) 显示出由于分子运动性而具有高性能弹性体的潜力.
  • 关于MIPs,特别是线性多素的机械性质的研究落后于它们的合成.

研究的目的:

  • 开发和表征新的可拉伸的聚二氧化弹性体 (PREs).
  • 研究机械键和宏观材料特性之间的关系.
  • 建立PREs作为模型系统,以了解MIP中的结构-属性相关性.

主要方法:

  • 一个氧功能化 [2]rotaxane 的合成.
  • 凝结聚合的 [2]rotaxane与二氧化酸盐形成PREs.
  • 机械测试用于评估伸展性,模和性.

主要成果:

  • 成功合成了可拉伸的多[2]rotaxane弹性体 (PREs).成功合成了可拉伸的多[2]rotaxane弹性体 (PREs).
  • 代表性的PRE表现出异常的伸展性 (∼1200%),Young的模量为24.6MPa,性为49.5MJ/m3.
  • 建立了多[2]rotaxanes的拓结构和它们的宏观机械性能之间的相关性.

结论:

  • PREs独特的拓架构,包括机械键,显著增强了宏观的机械性能.
  • 能量消散路径,包括主机-客机相互作用解离和车轮-轴滑动,是观察到的机械性能的关键.
  • PREs作为有效的模型系统,用于阐明机械键在弹性性质中的作用.