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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.
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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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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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具有pH响应降解性的电离合聚合物:在特定环境中加速降解.

Xiao Li1, Wei-Zhen Zheng1, Peng-Yuan Xu1

  • 1National Engineering Research Center of Engineering Plastics and Ecological Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the total environment
|August 30, 2024
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概括

对环境敏感的可生物降解聚合物为塑料的稳定性和降解提供了解决方案. 用硫酸基 (PBATS) 组修改的聚乙烯基合丁甲基 (PBAT) 显示了增强的特性和响应pH的降解,非常适合环境和医疗用途.

关键词:
离子体是什么? 离子体是什么在PBAT和PBAT之间海水是可以降解的.5-硫二甲酸是的 5-硫二甲酸适应pH的降解特性.

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 环境科学 环境科学

背景情况:

  • 可生物降解塑料需要稳定性和可控降解之间的平衡.
  • 环境敏感的聚合物提供可调节的降解配置文件.
  • 聚乙烯基合丁二甲酸盐 (PBAT) 是一种常见的可生物降解聚.

研究的目的:

  • 开发一种对环境有响应的生物降解聚.
  • 通过合成修改来增强PBAT的特性.
  • 为了研究改性聚合物的pH响应性降解行为.

主要方法:

  • 用1-3-异甲-5-硫酸盐 (SIPA) 合成的聚乙烯基酸盐-co-甲 (PBAT) 的合成修饰,以产生PBATS.
  • 机械和热性能的表征.
  • 评估水友性和吸水能力.
  • 在各种pH缓冲溶液,天然海水和模拟体液中进行降解研究.

主要成果:

  • 修改后的共聚,PBATS,表现出增强的机械和耐热性能.
  • 与PBAT相比,PBATS显著改善了水友性和吸水能力.
  • 在酸性和性条件和海水下降解加速,但在中性pH (7.2) 时被抑制.
  • 在模拟的酸性胃液中观察到特定和快速的降解.

结论:

  • 引入硫酸离子组使PBAT具有环境响应和pH依赖的降解.
  • PBATS表现出可调节的降解,比传统的可生物降解聚合物具有优势.
  • 这种材料由于其响应性降解特性,在环境修复和医疗领域具有潜在的应用.