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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.
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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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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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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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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.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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甲烯酸聚合物与"翻转的外部"基:一篇评论

Dhiraj Kumar1, Robert D Bolskar2, Isha Mutreja3

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概括

新的乙烯基二醇 (乙烯基甲基酸盐) (EGEMA) 牙科复合材料通过外部定位键来提高耐久性. 这种设计增强了对水解的抗性,比传统的甲基酸盐材料提供了更好的长期性能.

关键词:
降解降解降解降解降解.牙科 牙科是指牙科.牙科材料 牙科材料耐久性 耐久性 耐久性翻转了埃斯特尔集团的情况.甲基酸盐单体分子这是一种新型聚合物.物理属性 物理属性

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科学领域:

  • 生物材料科学 生物材料科学
  • 聚合物化学 聚合物化学
  • 牙科材料 牙科材料

背景情况:

  • 目前的牙科树脂复合材料在长期耐用性方面存在局限性,原因是甲基酸聚合物中质键的水解.
  • 聚合物骨干中的结容易被水和酶降解.

研究的目的:

  • 评估一种新型甲烯酸单体乙烯基二醇 (乙烯甲烯酸) (EGEMA) 的降解耐力和物理性能.
  • 为了比较EGEMA与传统的乙烯基醇二甲酸盐 (EGDMA) 的性能.

主要方法:

  • 定制合成EGEMA与外部基组.
  • 使用缓冲剂,雌激酶和微生物环境进行降解试验.
  • 使用LC/GC-MS进行降解产品的分析.
  • 基于生物信息学的生物降解预测.

主要成果:

  • 与EGDMA相比,EGEMA在所有降解试验中表现出优越的物理和机械性能.
  • EGEMA的水解产生了最小的乙醇,保持了聚合物骨干的完整性.
  • 实验结果与生物信息学关于生物降解的预测保持一致.

结论:

  • 由于其外部基组的定位,EGEMA具有增强的降解耐受性.
  • 这种新的结构有可能提高牙修复材料的临床耐用性.
  • 需要对具有外部基组的定制合成甲基酸盐进行进一步的研究.