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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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Plastic Behavior01:21

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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高性能可回收聚弹性体通过过渡应变强化.

Chang Gao1, Kam C Poon1, Matilde Concilio1

  • 1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, United Kingdom.

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概括
此摘要是机器生成的。

新的无形块聚弹性体通过短暂应变强化实现高强度和弹性,增强机械性能,同时保持可持续材料的可回收性.

关键词:
区块共聚物的区块共聚物.高性能的高性能.机械性能 机械性能 机械性能聚卡普罗拉克托尼是一种多重的产物.聚聚是什么意思 聚聚是一种可持续的聚合物聚合物热塑性弹性体的热塑性弹性体.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 可持续材料 可持续材料

背景情况:

  • 聚热塑性弹性体提供了可持续性,但通常会损害强度和弹性等机械性能.
  • 实现强硬和坚固的弹性体通常涉及复杂的配方和交联/结晶性控制,阻碍了可回收性.
  • 目前的方法在平衡机械性能与易于回收的方面面临挑战.

研究的目的:

  • 开发具有改进的机械性能和可回收性的新型无形块聚弹性体.
  • 为了提高强度和性,在完全无形结构中引入暂时应变刚性.
  • 创造可持续的弹性体,克服现有材料的局限性.

主要方法:

  • 商业化单体的受控聚合,以制造块共聚合物.
  • 无形区块聚弹性体的合成,其中有一个中心的poly ((ɛ-caprolactone-co-ɛ-decalactone) 区块和poly ((cyclohexene oxide-alt-phthalate) 侧面区块.
  • 通过调整e-caprolactone与e-decalactone的比率来调整热力学性能.

主要成果:

  • 最好的弹性体 (30-50%重量%聚烯) 实现了高达40MPa的抗拉强度和破裂时延伸>2000%,弹性回收>90%.
  • 材料表现出应变诱导的结晶,在拉伸力机械性质上表现优于商业弹性体.
  • 证明了广泛的使用温度范围 (-60至140°C),高热稳定性 (≥300°C) 和出色的可回收性.

结论:

  • 无形块聚弹性体中的过渡应变强化增强了强度和性,同时保持了可回收性.
  • 这些新材料代表了可持续弹性体技术的重大进步.
  • 开发的弹性体提供了机械性能,热稳定性和可回收性的优越组合.