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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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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 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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size
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用聚乙烯糖醇基塑化剂增强聚乳酸膜:一种反应挤出方法

Carlos Lazaro-Hdez1, Jaume Gomez-Carturla1, Marina P Arrieta2,3

  • 1Instituto Universitario de Investigación de Tecnología de Materiales (IUITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, Alcoy, Alicante, 03801, Spain.

Macromolecular rapid communications
|May 20, 2025
PubMed
概括
此摘要是机器生成的。

反应挤出增强聚乳酸 (PLA) 薄膜与聚乙烯糖醇 (PEG) 增塑剂,提高灵活性和减少安全食品接触的迁移. 这一过程提高了机械和热性能,扩大了PLA.

关键词:
交叉链接 交叉链接 交叉链接膜挤出 膜挤出聚乙烯糖醇是一种聚乙烯糖醇.多乳酸多乳酸是什么意思反应挤出反应式挤出.

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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

背景情况:

  • 聚乳酸 (PLA) 是一种可生物降解的聚合物,其灵活性和可塑化剂迁移受到限制.
  • 提高PLA的性能对于扩大其应用,特别是食品包装至关重要.

研究的目的:

  • 为了提高PLA薄膜的机械和热性能,使用聚乙烯糖醇 (PEG) 基塑化剂.
  • 通过反应挤出 (REX) 来减少PLA薄膜中的塑化剂迁移.
  • 评估修改后的PLA薄膜是否适用于与食品接触的应用.

主要方法:

  • 使用聚乙烯糖醇 (PEG) 作为可塑剂对PLA薄膜进行修改.
  • 作为交叉链接剂的二甲基过氧化物 (DCP) 的反应挤出 (REX) 的应用.
  • 评估机械性能 (破裂时的延长,抗拉强度),热稳定性,玻璃过渡温度 (Tg),可塑化剂迁移,光学性能和水蒸气透性.

主要成果:

  • 加入PEG使破裂时的延长率从12.0%增加到61.3%,同时保持拉伸强度.
  • 雷克斯显著减少了塑化剂的迁移,从140.3 mg/kg降至40.8 mg/kg.
  • 降解温度从268.7°C增加到333.8°C,Tg降低到38.3°C,提高了柔性.
  • 经过修改的膜显示保持透明度和增加水蒸气透性.

结论:

  • 反应挤出有效地增强了用PEG塑性化的PLA薄膜,提高了机械强度,延展性和热稳定性.
  • 减少塑化剂迁移使得这些修改后的PLA薄膜在与食品接触的应用中安全.
  • 改进的性能扩大了PLA的工业应用,同时保持了其对环境的好处.