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相关概念视频

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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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...
3.7K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.7K
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...
2.7K

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相关实验视频

Updated: Jan 16, 2026

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy
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Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy

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聚合物混合物增方法用于量化100%聚烯混合物的聚烯变体.

Meysam Hashemnejad1, Ami Doshi1

  • 1Cincinnati Technology Center, LyondellBasell, 11530 Northlake Drive, Cincinnati, OH 45249, USA.

Polymers
|September 27, 2025
PubMed
概括

精确识别回收材料中的聚烯类型对于有效的回收至关重要. 一种新的结晶化分化 (CEF) 方法精确量化了回收聚烯混合物中的Homo-PP和Random-PP.

科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 对消费后回收 (PCR) 聚烯的准确表征对于优化机械回收和与原始聚合物混合至关重要.
  • 在100%的PP材料中,区分异体性Homo-PP (Homo-PP),随机PP和非晶体PP组件是具有挑战性的.
  • 现有的方法难以精确量化复杂的回收流中的PP变体.

研究的目的:

  • 开发和验证一种基于溶液的结晶化分离 (CEF) 技术,用于精确的PP变体量化.
  • 为了能够准确地确定回收聚烯中的Homo-PP,Random-PP和非晶体PP含量.
  • 支持知情的材料选择,提高聚烯回收操作的效率.

主要方法:

  • 采用了一种基于溶液的新结晶化分化 (CEF) 技术.
  • 线性低密度聚乙烯 (LLDPE) 引入,以促进100% PP样本中的Homo-PP与随机PP的分离.
  • 已建立的校准曲线被用于PP变体的定量分析.

主要成果:

  • 在PP混合系统中,CEF技术成功地分离和量化了Homo-PP和Random-PP.
  • 通过广泛的成分范围实现了准确的量化,从大约5%到95%的重量随机-PP.
关键词:
构成分析 构成分析结晶化化分化 (CEF) 的方法聚乙烯聚乙烯的使用情况.聚烯的特性描述聚烯聚烯的使用方法消费后回收物 (PCR) 的使用

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  • 该方法有效地解决了Homo-PP,随机PP和非晶体PP分数.

    • 结论:

    • 拟议的CEF方法为在回收材料中的PP变体的特征提供了可靠的解决方案.
    • 这种技术为PP成分提供了宝贵的见解,有助于优化回收过程.
    • 更好地了解PCR PP成分可以促进更可持续和更有效的聚合物回收利用.