基于styrene的热塑性弹性体的与过程相关的流动特征及其通过rheometric数据的表示
Markus Kaempfe1, Matthieu Fischer1, Ines Kuehnert1
1Leibniz-Institut für Polymerforschung Dresden e.V., D-01069 Dresden, Germany.
Polymers
|September 9, 2023
概括
热塑性弹性体 (TPSs) 呈现出复杂的流动行为,挑战了标准的折射学数据. 它们的多相形态显著影响处理,限制了传统表征方法的可靠性.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 类风病学 类风病学 类风病学
背景情况:
- 基于 styrene 块共聚合物的热塑性弹性体 (TPS) 具有复杂的多相形态.
- 这些形态学显著影响它们的流动行为,通常被标准表征技术所忽视.
- 了解非牛顿流体现象对于TPS处理中准确的风度数据至关重要.
研究的目的:
- 评估非牛顿流体现象对于热塑性弹性体 (TPS) 处理中的类比数据有效性的相关性.
- 评估TPS常用的表征和评估程序的可靠性.
- 调查剪切和几何条件对TPSs风湿行为的影响.
主要方法:
- 三种商业TPS具有相似硬度 (约. 60 岸边 A) 但不同的应用.
- 采用平行板和高压毛细血管类风湿学来进行材料特征.
- 采用计算流体动力学 (CFD) 模拟来建模毛细血管风力计流量并评估数据的有效性.
主要成果:
- 经过切割和几何条件的影响,TPS表现出明显的质行为.
- 观察到压力损失的不成比例增加 (高达三分之一),当加倍毛细血管直径的最低粘度TPS.
- CFD模拟无法再现低粘度材料的毛细管流,这表明模拟的限制或材料的复杂性.
结论:
- 对于TPS的常规确定的风力测量数据在评估不同材料等级的工艺流量时具有有限的适用性.
- TPS复杂的多相形态需要先进的评估方法,超出标准的类风湿学.
- 非牛顿流现象和几何效应在TPS处理中起着关键作用,影响数据解释.
更多相关视频
13:34High Throughput Traction Force Microscopy Using PDMS Reveals Dose-Dependent Effects of Transforming Growth Factor-β on the Epithelial-to-Mesenchymal Transition
Published on: June 1, 2019
9.5K
07:14In situ Photo-rheology Monitors Viscoelastic Changes in Photo-responsive Polymer Networks
Published on: June 20, 2025
140
相关概念视频
Polymer Classification: Stereospecificity
2.5K
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...
2.5K
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
Members Made of Elastoplastic Material
119
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
119
Types of Step-Growth Polymers: Polyesters
2.3K
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...
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...
2.3K
Polymer Classification: Architecture
2.8K
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...
2.8K
Plastic Behavior
219
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...
219
