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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

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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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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture
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一个定制的自组装协同生物催化剂用于塑料脱聚合.

Wei Zhang1, Yuying Han1, Feng Yang1

  • 1Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education; Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology; National Engineering Laboratory for Industrial Enzymes, Tianjin 300457, China.

Journal of hazardous materials
|August 1, 2024
PubMed
概括

研究人员开发了一种用于有效降解塑料的新型生物催化剂. 这种基于酶的方法增强了聚废物回收利用,为环境挑战提供了可持续的解决方案.

关键词:
在MHETase的基础上.酸酶 (PETase) 是一种塑料的降解 塑料的降解聚乙烯四甲酸是一种聚乙烯甲酸.有协同效应的效应.

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科学领域:

  • 生物技术是生物技术.
  • 材料科学 材料科学 材料科学
  • 环境科学 环境科学

背景情况:

  • 塑料废物,特别是聚,对环境构成重大挑战.
  • 酶降解为塑料回收提供了一个可持续的循环碳路径.
  • 聚乙烯酸酶 (PETase) 和MHET酸酶 (MHETase) 是PET脱聚合的关键酶.

研究的目的:

  • 设计一个强大的,高效的协同生物催化剂,用于直接降解PET.
  • 增强对PET表面的酶吸附,并提高酶稳定性.
  • 为了实现可扩展的聚废物的生物催化上循环.

主要方法:

  • 工程化水蛋白HFBI融合PETase和MHETase,以改善PET表面相互作用和稳定性.
  • 开发了一种定制的自组装协同生物催化剂 (MC@CaZn-MOF) 用于两步解聚合过程.
  • 在未经处理的AGf-PET上评估了催化剂的附着性,耐用性和降解效率.

主要成果:

  • 量身定制的MC@CaZn-MOF生物催化剂表现出增强的附着性和耐久性,在pH值8.0和60°C下120小时后保持超过70%的活性.
  • MC@CaZn-MOF直接分解未经处理的AGf-PET,达到90%以上的体重减轻,并产生9.5毫米的TPA.
  • 双功能催化剂促进了聚废物的高效脱聚合.

结论:

  • 开发的MC@CaZn-MOF代表了大规模生物催化PET降解的重大进展.
  • 这种方法为聚合物回收利用提供了一个可行的策略,并促进了环境可持续性.
  • 协同作用的生物催化剂设计提高了实际塑料废物管理的效率和稳定性.