高填充聚合物组合物的风湿学-填充,结构和运输现象的极限
Alexander Ya Malkin1, Valery G Kulichikhin1, Svetlana Yu Khashirova2
1A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Science, 29. Leninsky Prospect, 119991 Moscow, Russia.
Polymers
|February 10, 2024
概括
高度填充的悬浮物表现出从液态到固态的关键态过渡. 了解颗粒包装和集群动态对于材料加工和产品质量至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 类风病学 类风病学 类风病学
- 聚合物科学 聚合物科学
背景情况:
- 研究含有高度球形固体填充剂的材料的气质学.
- 专注于填充剂度的关键点及其对材料行为的影响.
研究的目的:
- 详细介绍高填充材料中关键度点的物理.
- 总结关于粒子包装极限的理论和实验数据.
- 探索接近最大包装的现象,包括不稳定性和异质性.
主要方法:
- 综述关于风湿学理论和实验数据.
- 分析模型和精细结构研究.
- 检查临界填料度附近的物理现象.
主要成果:
- 识别了几何转变:液体,屈服,弹性-塑料和弹性固体类状态.
- 总结了密集颗粒包装的极限,对于应用至关重要.
- 观察到的不稳定性和集群形成导致不连续性和墙壁滑动.
结论:
- 了解高度填充系统中的关键现象对于粒子技术至关重要.
- 对变和不稳定的洞察力为多相处理提供了信息.
- 密集的包装极限和异质性动态是材料性能的关键因素.
相关概念视频
Polymer Classification: Architecture
2.7K
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...
2.7K
Polymer Classification: Crystallinity
2.9K
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...
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...
2.9K
Polymers: Molecular Weight Distribution
3.4K
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.
3.4K
Molecular Weight of Step-Growth Polymers
2.2K
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...
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...
2.2K
Types of Fluids
255
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
255
Characteristics of Fluids
330
Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
330


