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相关概念视频

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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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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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对环保固态聚氨泡的研究目前的进展

Sylwia Makowska1,2, Dawid Szymborski1, Natalia Sienkiewicz1

  • 1Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, 90-924 Lodz, Poland.

Materials (Basel, Switzerland)
|August 29, 2024
PubMed
概括

这项研究探讨了使用植物性聚合物和纸张废物的纤维素合成环保型聚氨 (PU) 泡. 这些可持续材料为传统石化产品提供了一个有希望的替代品,用于隔热.

关键词:
异酸盐是一种异酸盐.聚类是多聚的组成部分.聚氨泡是一种聚氨泡属性 属性 属性 属性可持续性 可持续性的可持续性废物填充器 废物填充器 废物填充器

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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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科学领域:

  • 材料科学 材料科学 材料科学
  • 绿色化学 绿色化学
  • 聚合物化学 聚合物化学

背景情况:

  • 聚氨泡由于密度和导电性较低,可以提供出色的绝热.
  • 目前的合成依赖于有毒的石化物质,如异酸盐和聚醇.
  • 工业界对传统聚氨前体的可持续替代品有很大的需求.

研究的目的:

  • 描述使用环保材料合成聚氨泡的过程.
  • 调查从废纸中获得的植物性聚醇和纤维素作为可持续原料的使用情况.
  • 开发用于聚氨泡合成的创新和有前途的方法.

主要方法:

  • 聚氨泡的合成使用植物性聚合物.
  • 从废纸中提取的纤维素作为增强剂的加入.
  • 由此产生的泡接口和属性的表征.

主要成果:

  • 使用可持续原料成功合成聚氨泡.
  • 植物材料和纸张废弃物衍生的纤维素作为可行的组件的证明.
  • 通过使用这些新型材料,提高泡接口性能的潜力.

结论:

  • 描述的方法为聚氨泡合成提供了一种创新的方法.
  • 从废纸中利用植物性聚醇和纤维素是一种有希望的可持续替代品.
  • 这项研究可以通过减少对石化产品的依赖,显著影响聚氨泡生产的未来.