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相关概念视频

Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

437
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
437
Superplasticizers01:30

Superplasticizers

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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
301
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
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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.
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...
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Step-Growth Polymerization: Overview01:03

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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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相关实验视频

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延迟结晶反应启发的水性聚氨具有高性能.

Chenxi Huyan1, Dong Liu2, Xiang Han1

  • 1State Key Laboratory of Fluorine and Nitrogen Chemicals, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.

Nature communications
|October 30, 2025
PubMed
概括
此摘要是机器生成的。

本研究提出了一种具有增强机械强度和性的高性能水性聚氨弹性体 (WPUE). 它利用延迟结晶反应为传统热塑性聚氨弹性体 (TPUE) 的可持续替代品.

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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
  • 可持续化学 可持续化学

背景情况:

  • 水性聚氨弹性体 (WPUE) 通过减少挥发性有机化合物 (VOC) 排放,为热塑性聚氨弹性体 (TPUE) 提供了一个可持续的替代品.
  • 然而,与TPUE相比,WPUE通常具有较低的机械强度,这限制了其广泛采用.
  • 开发高性能WPUE对于推进聚合物制造中的绿色化学原则至关重要.

研究的目的:

  • 开发一种高性能水性聚氨弹性体 (WPUE),其机械性能与热塑性聚氨弹性体 (TPUE) 相似或超过.
  • 调查负责WPUE中增强机械性能的自强化机制.
  • 展示一种可持续和绿色的替代传统的基于溶剂的聚氨弹性体.

主要方法:

  • 合成WPUE使用对称的单体和工程等级的键,以创建一个动态的双相结构.
  • 描述WPUE的机械性能,包括性和强度,在拉力拉伸下.
  • 对延迟结晶反应及其与变形过程中的双相结构相关性的分析.

主要成果:

  • 在开发的WPUE中实现了0.959 GJ/m3的高性和81.8 MPa的强度.
  • 鉴定了一种延迟结晶反应机制,由于硬质障碍,在~13的拉伸比率下触发.
  • 在拉伸比>20时观察到硬和软部分的共同结晶,从而显著提高机械性能.

结论:

  • 开发的WPUE通过一种新的自我增强机制表现出卓越的机械强度和性.
  • 这一突破为传统TPUE提供了一个可行的,高性能和可持续的替代方案,与绿色化学目标保持一致.
  • 设计的动态双相结构和延迟结晶反应是实现更广泛应用的强大的WPUE的关键.