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相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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聚合物-纳米粒子二元混合物的热演变.

Sanjay Kumar1,2, Sangram K Rath3, Ashwani Kushwaha4

  • 1Department of Chemical Engineering, B.M.S. College of Engineering, Bengaluru 560 019, India.

Physical chemistry chemical physics : PCCP
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PubMed
概括
此摘要是机器生成的。

聚合物-纳米粒子混合物的热演变改变了纳米粒子结晶性和聚合物-纳米粒子相互作用. 这个过程创建了一个分散的接口,影响材料特性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 纳米技术纳米技术

背景情况:

  • 聚合物-纳米粒子 (NP) 混合物表现出独特的特性,受热历史的影响.
  • 了解热进化过程中的微观变化对于定制材料性能至关重要.

研究的目的:

  • 实验性地研究热演变对NP分散,结晶性,聚合物-NP接口和相互作用的影响.
  • 将这些变化映射到各种温度和NP度的地图上.

主要方法:

  • 实验探测一个模型的聚丁和粘土纳米板块混合物.
  • 在温度 (T > Tg) 和NP度的频谱中进行分析.

主要成果:

  • 热演变和NP度对NP分散没有影响.
  • 随着热演变,NP晶体秩序显著下降.
  • 一个利的聚合物-NP接口过渡到一个扩散层,而已经扩散的接口保持不变.
  • 主要的相互作用从聚合物-聚合物转向聚合物-NP.

结论:

  • 热演变显著影响NP结晶性和聚合物-NP界面特性.
  • 这项研究解释了聚合物-纳米粒子混合物中异常行为的分子基础.
  • 这些发现为设计先进的纳米复合材料提供了洞察力.