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相关概念视频

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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Polymer Classification: Stereospecificity01:26

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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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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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Polymer Classification: Architecture01:14

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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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Step-Growth Polymerization: Overview01:03

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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.
Many natural and synthetic polymers are produced by...
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Molecular Weight of Step-Growth Polymers01:08

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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.
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The extent of the...
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可调和可降解的动态热从兼容的多基甲酸混合物中制成.

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概括

在这项研究中,从聚酸酸盐 (PHAs) 制造出一种可生物降解的聚合物混合物. 由此产生的动态热是可降解和可再加工的,为交联聚合物提供可持续的替代品.

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科学领域:

  • 聚合物科学与工程 聚合物科学与工程
  • 生物技术和生物工程 生物技术和生物工程
  • 材料科学 材料科学 材料科学

背景情况:

  • 聚酸酸 (PHAs) 是生物基聚烯,具有作为可降解热塑性替代品的潜力.
  • PHAs的化学多样性表明它们在制造可逆性,可降解的热中具有实用性.
  • 一些PHA共聚合物的脆性需要改进机械性能的策略.

研究的目的:

  • 为了设计Pseudomonas putida KT2440用于合成聚3-基酸-co-3-基基酸 (PHBU).
  • 开发使用PHBU和软PHA共聚合物的兼容性,动态耐热混合物.
  • 评估由此产生的动态热稳固混合物的可降解性和热力学性能.

主要方法:

  • 用*Pseudomonas putida* KT2440进行基因工程,以产生PHBU.
  • 物理混合PHBU与多3-基二酸-co-3-基二酸) 在不同的比例.
  • 使用乙烯点击化学,安装动态乙烯交叉链接.
  • 通过扫描电子显微镜对混合物不混合性进行表征.
  • 在淡水中评估热力学形状和生物降解.

主要成果:

  • 成功合成PHBU,其中含有3基酸盐和不和3基酸盐.
  • 创建兼容的动态热固体与可调节的热力学特性 (硬,中,软) 结合在一起.
  • 在生物降解实验中实现了及时的质量损失,证明了交联混合物的可降解性.
  • 证明了重新处理动态耐热材料的潜力.

结论:

  • 建立了一个由两个组成部分组成的平台,用于从PHA共聚合物中生产可降解和可再加工的动态热稳固混合物.
  • 开发的材料为传统的交联聚合物提供了一个可持续的替代品.
  • 这种方法使得基于PHA的材料适用于各种交联聚合物应用.