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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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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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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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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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来自与食品接触材料的烯迁移.

Tatiana Gonçalves Norte1, Fernando Ramos2, Cristina Nerín3

  • 1University of Coimbra, Faculty of Pharmacy, Health Sciences Campus, Azinhaga de St. Comba, 3000-548 Coimbra, Portugal.

Food chemistry
|December 21, 2025
PubMed
概括

来自食品包装的 styrene 迁移是令人担忧的,尽管水平通常在极限之内. 需要对累积暴露和更安全的食品包装的可持续解决方案进行进一步的研究.

关键词:
循环经济是一个循环经济.暴露 暴露 暴露与食品接触的材料.食品仿制剂是一种食品仿制剂.移民 移民 移民斯泰林是一种烯.

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科学领域:

  • 食品科学与技术 食品科学与技术
  • 环境健康 环境健康
  • 聚合物化学 聚合物化学

背景情况:

  • styrene 是食品包装塑料中的一个关键有机化合物.
  • 人们对烯迁移到食品中的情况及其对健康的影响存在担忧.
  • 了解烯迁移对于食品安全至关重要.

研究的目的:

  • 审查和综合关于食品包装中的 styrene 迁移的研究.
  • 评估检测 styrene 迁移的方法.
  • 评估影响移民和人类健康后果的因素.

主要方法:

  • 文献综述和对现有研究进行比较分析.
  • 评估用于确定 styrene 迁移的分析方法.
  • 评估影响 styrene 迁移的因素 (例如,包装,加工).

主要成果:

  • 食品中的 styrene 含量通常符合当前的监管标准.
  • 包装材料和食品加工对 styrene 迁移有很大的影响.
  • 来自不同来源的累积暴露需要进一步调查.

结论:

  • 虽然目前的水平往往是安全的,但需要持续监测和更新的安全标准.
  • 对 styrene 迁移进行特定背景的评估是必不可少的.
  • 采用循环经济原则对于减少 styrene 释放和提高食品包装安全至关重要.