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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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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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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...
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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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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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聚烯混合物与选择性交联分散相混合,基于西兰基改性聚乙烯.

Markus Gahleitner1, Tung Pham2, Doris Machl1

  • 1Borealis Polyolefine GmbH, Innovation Headquarters, St. Peterstr. 25, 4021 Linz, Austria.

Polymers
|December 23, 2023
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概括

这项研究探讨了使用西兰-交联聚乙烯 (PE) 修饰剂来增强聚烯 (PP) 的冲击强度. 较低密度的PE修饰剂,特别是含有烯酸盐的修饰剂,显著提高了性,尽管相位稳定不是主要的机制.

关键词:
交叉连接 交叉连接机械学 机械学 机械学形态学 形态学 形态学多阶段的多相.聚乙烯聚乙烯的使用情况.聚烯聚烯的使用方法类风病学 类风病学 类风病学 类风病学

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科学领域:

  • 聚合物科学与工程 聚合物科学与工程
  • 材料科学 材料科学 材料科学
  • 复合材料 复合材料 复合材料

背景情况:

  • 聚烯 (PP) 多相组合物需要形态稳定,以保持一致的冲击强度.
  • 现有的稳定PP形态的方法在性能和适用性方面存在局限性.
  • 分离混合和交联过程为材料改造提供了一种新的方法.

研究的目的:

  • 调查使用西兰交联聚乙烯 (PE) 同型和共聚合物作为PP的冲击修饰剂.
  • 评估不同PE修饰剂对各种PP共聚合物的刚性冲击平衡的影响.
  • 了解冲击强度改进背后的机制,并评估可处理性.

主要方法:

  • 使用商业用烯共聚合低密度PE (LD-PEX) 和烯接种高密度PE (HD-PEX) 作为修饰剂.
  • 与各种PP共聚合物配制的混合物,包括乙烯-随机共聚合物 (PPR),冲击 (PPI) 和随机冲击 (PPRI) 共聚合物.
  • 评估了由此产生的组合物的冲击强度,刚度与冲击平衡,形态和融化流量.

主要成果:

  • 使用LD-PEX和HD-PEX修饰剂的混合物在PPR,PPI和PPRI共聚合物中显示出更好的刚性影响平衡.
  • 较低密度的PE修饰剂,特别是带有烯酸的LD-PEX (Tg ~ -40 °C),表现出优越的硬化效果.
  • 观察到冲击强度的改善,但主要不是由于预期的相位稳定;混合过程中颗粒大小增加.
  • 热塑性可加工性得到维持,但化流速的下降限制了实际应用.

结论:

  • 可交叉链接的PE修饰剂提供了一个可行的途径来增强PP共聚物质的冲击性能.
  • 修饰剂密度和特定的共因子 (如烯酸盐) 显著影响固效率.
  • 虽然保留了可加工性,但对于工业用途,降低融流速需要仔细考虑.