使用分子动力学模拟方法研究不同的聚合物改性模型青.
George Rucker1, Liqun Zhang2,3
1Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN, 38505, USA.
Environmental science and pollution research international
|January 22, 2026
概括
研究人员使用分子动力学模拟来研究废弃轮胎聚合物如PS,SBS和SBR如何提高青性能. 这些聚合物改变了青的密度和导热性,有助于废旧轮胎回收用于道路路面.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 聚合物科学 聚合物科学
背景情况:
- 青是一种原油衍生物,对于道路路面和屋顶至关重要.
- 通过将轮胎衍生聚合物纳入青混合物来回收废旧轮胎,可以提高路面的性能.
- 了解分子级别的修改是优化这种回收过程的关键.
研究的目的:
- 调查不同废旧轮胎聚合物的分子级改造对青性能的影响.
- 用模拟来比较聚合物改性青与原始青的物理和机械性能.
- 为设计有效的废轮胎回收策略提供洞察力.
主要方法:
- 采用全原子LAMMPS分子动力学模拟来模拟使用四种常见聚合物的青系统:聚乙烯 (PE),聚烯 (PS), styrene-butadiene (SBR) 和 styrene-butadiene-styrene (SBS).
- 从室温到热混合青温度的温度范围内的模拟系统.
- 预测的关键性质包括密度,组件扩散系数,辐射分布函数,导热率,相关函数,粘度和聚合物旋转半径.
主要成果:
- 聚合物添加改变了青分子的包装,PS,SBS和SBR增加了青粘合剂密度,而PE则减少了它.
- 青粘合剂系统的导热率随着聚合物加入而下降.
- 组件扩散系数在不同的青系统中表现出类似的温度依赖.
结论:
- 该研究阐明了不同聚合物修改青性能的分子机制.
- 这些发现为了解青介质中的聚合物行为提供了基础.
- 结果支持废轮胎回收利用的战略设计,以改善青路面.
相关概念视频
02:00Molecular Models
43.6K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
43.6K
01:01Polymers: Defining Molecular Weight
3.8K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight. So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
The number average molecular weight (Mn) is the summation of the number...
3.8K
01:10Polymers: Molecular Weight Distribution
4.7K
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.
4.7K
01:08Molecular Weight of Step-Growth Polymers
2.7K
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...
2.7K
02:34Polymers
40.5K
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...
40.5K
02:34Polymers
23.2K
23.2K