模拟聚苯乙烯pompom /线状和pompom /星形共混物的伸长粘度

IF 2.3 3区 工程技术 Q2 MECHANICS Rheologica Acta Pub Date : 2023-08-03 DOI:10.1007/s00397-023-01411-1
Valerian Hirschberg, Shan Lyu, Max G. Schußmann, Manfred Wilhelm, Manfred H. Wagner
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引用次数: 1

摘要

Hirschberg等人最近报道了聚苯乙烯(PS) Pom-Pom与两种线性聚苯乙烯共混物的伸长流变学(J. Rheol. 2023, 67:403-415)。Pom-Pom PS280k-2x22-22k在每个分支点上都有一个自纠缠的主链(Mw,bb = 280 kg/mol)和22个纠缠的侧链(Mw,a = 22 kg/mol),以75%到2wt %的重量分数与两个Mw分别为43 kg/mol (PS43k)和90 kg/mol (PS90k)的线状聚苯乙烯(PS)混合。而纯Pom-Pom在拉伸流动中表现出强烈的应变硬化(SHF >100)、应变硬化(SHF >10)在只含2 wt%的棉球/线状混合物中仍然可以观察到。分子量分数在10%以上的共混物的伸长启动粘度可以用分子应力函数(MSF)模型很好地描述,但需要两个非线性拟合参数。本文表明,基于分层松弛和动态稀释概念的分层多模分子应力函数(HMMSF)模型可以对拉长粘度数据进行定量和无参数建模。此外,我们还研究了由20 wt%的pomm - pom PS280k-2x22-22k和80 wt%的11条分子量为Mw,a = 25 kg/mol的PS星组成的共混物的伸长粘度,该共混物的跨分子量与PS43k相似,Mw,a与pomm - pom相似。这项工作可能会通过添加具有优化拓扑的聚合物来获得预期的应变硬化,例如用于吹膜应用,从而为不太明确的聚合物的聚合物升级回收开辟可能性。图形抽象
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Modeling elongational viscosity of polystyrene Pom-Pom/linear and Pom-Pom/star blends

The elongational rheology of blends of a polystyrene (PS) Pom-Pom with two linear polystyrenes was recently reported by Hirschberg et al. (J. Rheol. 2023, 67:403–415). The Pom-Pom PS280k-2x22-22k with a self-entangled backbone (Mw,bb = 280 kg/mol) and 22 entangled sidearms (Mw,a = 22 kg/mol) at each of the two branch points was blended at weight fractions from 75 to 2 wt% with two linear polystyrenes (PS) having Mw of 43 kg/mol (PS43k) and 90 kg/mol (PS90k), respectively. While the pure Pom-Pom shows strong strain hardening in elongational flow (SHF > 100), strain hardening (SHF > 10) is still observed in Pom-Pom/linear blends containing only 2 wt% of Pom-Pom. The elongational start-up viscosities of the blends with Pom-Pom weight fractions above 10 wt% are well described by the Molecular Stress Function (MSF) model, however, requiring two nonlinear fit parameters. Here we show that quantitative and parameter-free modeling of the elongational viscosity data is possible by the Hierarchical Multi-mode Molecular Stress Function (HMMSF) model based on the concepts of hierarchical relaxation and dynamic dilution. In addition, we investigated the elongational viscosity of a blend consisting of 20 wt% Pom-Pom PS280k-2x22-22k and 80 wt% of a PS star with 11 arms of Mw,a = 25 kg/mol having a similar span molecular weight as PS43k and similar Mw,a as the Pom-Pom. This work might open up possibilities toward polymer upcycling of less-defined polymers by adding a polymer with optimized topology to gain the intended strain hardening, e.g., for film blowing applications.

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来源期刊
Rheologica Acta
Rheologica Acta 物理-力学
CiteScore
4.60
自引率
8.70%
发文量
55
审稿时长
3 months
期刊介绍: "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."
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