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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

4.2K
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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.2K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.4K
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...
3.4K
Polymers02:34

Polymers

42.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
42.6K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

5.0K
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.
5.0K
Thermosensation01:43

Thermosensation

34.6K
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
34.6K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

3.0K
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...
3.0K

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相关实验视频

Updated: Mar 14, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
12:07

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

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在溶剂流下热敏聚合物通过分子动力学流动.

Scott D Hopkins1, Estela Blaisten-Barojas1

  • 1Center for Simulation and Modeling (formerly, Computational Materials Science Center) and Department of Computational and Data Sciences, George Mason University, Fairfax, Virginia 22030, United States.

The journal of physical chemistry. B
|March 13, 2026
PubMed
概括

这项研究引入了一种新的流动分子动力学方法,用于模拟聚合物溶液. 该方法揭示了聚合物延长的速度值,并证明了中的热敏聚合物行为.

科学领域:

  • 计算物理化学和工程计算物理化学和工程
  • 分子动力学模拟模型
  • 聚合物科学 聚合物科学

背景情况:

  • 稀释聚合物溶液 (LFDPS) 层流的传统计算方法难以捕获原子级分子特征.
  • 流动分子动力学 (FMD) 为模拟分子溶液流量提供了一个有希望的替代方案,但其在凝结相中的应用是有限的.
  • 现有的粗粒度和连续流体动力学方法需要用户定义的参数,这些参数阻碍了分子行为的准确复制.

研究的目的:

  • 为LFDPS.研究一个新的非平衡分子动力学 (NEMD) 方法的适用性.
  • 在流量条件下探索聚合物结构变化的原子化机制.
  • 证明使用热敏聚合物进行in silico LFDPS实验的可行性.

主要方法:

  • 在一个新的NEMD框架内使用了自定义修改的OPLS-AA力场.
  • 模拟LFDPS使用三个溶剂 (水,水/甘油混合物,甘油) 和两个热敏聚合物 (PNIPAM,PDEA).
  • 进行了200 ns的模拟,以观察应用流动下的能量和聚合物结构动态.

主要成果:

  • NEMD方法提供了稀释聚合物溶液中定向流量的描述性原子学视角.
  • 确定了聚合物从球状到延伸线圈状态的延伸所需的临界流速值 (v_th).

更多相关视频

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

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相关实验视频

Last Updated: Mar 14, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

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  • 证明了用热敏聚合物进行的in silico LFDPS实验可以在标准条件以上的10-40K温度下实现.

    • 结论:

    • 开发的口疾病方法准确地捕捉了LFDPS在原子级别,克服了传统方法的局限性.
    • 识别的流速值是影响聚合物形状变化的关键参数.
    • 热敏聚合物提供可调节的LFDPS系统,可通过流速和温度控制,适用于微流体和生物传感应用.