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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.
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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.
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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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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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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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在生物基聚烯的酶催化脱聚合过程中进行符合性选择.

Ximena Lopez-Lorenzo1,2, Ganapathy Ranjani1,2, Per-Olof Syrén1,2

  • 1School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, 100 44, Sweden.

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概括
此摘要是机器生成的。

当聚合物链形状与酶活性位相匹配时,生物聚合物的酶降解会增强. 这种形状选择是优化生物催化解聚合物的关键,以实现可持续的生物经济.

关键词:
生物基聚合物 生物基聚合物生物催化剂是一种生物催化剂.符合性选择的选择.酶性降解 酶性降解

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科学领域:

  • 生物催化和聚合物科学
  • 可持续化学 可持续化学
  • 生物技术是生物技术.

背景情况:

  • 酶性聚合物降解对生物经济至关重要,但聚合物的体积和链形状阻碍了生物催化剂的效率.
  • 之前的研究表明,聚乙烯二甲 (PET) 符合PETase的基因具有不同的亲缘关系,这影响了脱聚合率.
  • 在生物聚合物生物催化剂中的结构功能关系仍然不太清楚.

研究的目的:

  • 研究由基基二醇和可再生二醇衍生的新型生物聚合物的酶生物降解.
  • 探索聚合物链形状,酶活性部位结合和脱聚合效率之间的相关性.
  • 阐明形状选择在优化生物聚合物的生物催化降解中的作用.

主要方法:

  • 四种生物聚合物的合成,含有不同的半芳香和亚芳香含量.
  • 使用IsPETase S238A,Dura和LCC酶进行酶去聚合.
  • 诱导适合对接 (IFD) 分析,以预测基质-酶的形状匹配.

主要成果:

  • 酶去聚合的单体产量在没有预处理的情况下从2%到17%不等.
  • 降解效率与IFD预测的聚合物链和酶活性位点之间的形状匹配程度密切相关.
  • 这种相关性不管反应温度如何,都是正确的.

结论:

  • 符合性选择是生物聚合物的酶去聚合的关键因素.
  • 聚合物链的特定形状 (直或扭) 显著影响其与酶基态对象的亲和力.
  • 优化生物催化降解需要仔细考虑聚合物基质和酶之间的结构兼容性,为可持续的生物工艺开发提供见解.