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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis02:29

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

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Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
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Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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地板温度调节的聚乙烯-高) 具有热稳定性和化学可回收性,可通过聚凝-脱聚-再聚合策略实现.

Shiyu Guan1, Mingqian Wang1, Jingying Xiao1

  • 1Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.

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概括

我们使用一种新的合成策略开发了地板温度 (Tf) 调节的聚乙烯-乙烯 (PEAE). 这些先进材料提供了增强的热稳定性和可回收性,性能优于传统的天花板温度 (Tc) 调节的聚合物.

关键词:
化学的可回收性 化学的可回收性宏观循环是一种宏观循环.聚乙-乙) 是一种聚乙-乙.环开放型聚合方式

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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
  • 可持续化学 可持续化学

背景情况:

  • 聚乙烯-乙烯 (PEAE) 为先进材料提供了脱聚合性和热稳定性之间的平衡.
  • 目前的PEAE研究重点是天花板温度 (Tc) 调节,通常受到单体合成的限制.
  • 地板温度 (Tf) 调节的PEAE显示出增强热力学稳定性的承诺,但面临合成挑战.

研究的目的:

  • 开发一种新的合成策略,用于宏循环乙烯-单体.
  • 创建第一个具有高性能的Tf监管PEAE的例子.
  • 为了证明PEAE的热稳定性,化可加工性和化学可回收性得到改善.

主要方法:

  • 开发了一种用于宏环单体合成的"多重凝聚-脱聚合"战略.
  • 通过宏环单体的环开聚合 (ROP) 合成Tf调节的PEAE.
  • 以热性质,结晶性和可加工性为结果的PEAE的特征.

主要成果:

  • 成功合成了具有高效率和选择性的宏环乙烯单体.
  • 产生了一种半晶体,柔性Tf调节的PEAE,具有高分解温度 (Td,5% = 378.3 °C).
  • 与Tc调节的聚1,4-二-2-相比,已经证明了更高的热稳定性 (PPDO,Td,5% = 238.4 °C).

结论:

  • "多重凝聚-脱聚合"战略使得高性能Tf调节PEAE的合成成为可能.
  • 经Tc调节的PEAE克服了Tc调节类型的局限性,提供了更好的热稳定性和可回收性.
  • 这项工作为开发先进的聚乙-乙材料提供了分子设计原则.