Melt strain hardening of polymeric systems filled with solid particles: review and supplementary experimental results

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-04-26 DOI:10.1007/s00397-024-01452-0

Helmut Münstedt

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Abstract

Melt strain hardening is an interesting characteristic property of the elongational flow of polymers. While strain hardening of many unmodified polymer melts has been widely discussed, a comprehensive presentation of the influence of particles on this property is missing. Using literature data and own measurements, the effects of solid particles of various geometries are compared. Micro-sized particles generally reduce melt strain hardening and may even lead to strain thinning. This behavior is postulated to be due to shear flow components around the particles and resulting shear thinning of the polymer matrices that reduces the resistance to flow. More complex is the influence of nano-sized fillers and layered silicate nanoparticles, in particular. Weakly exfoliated particles show effects similar to micro-fillers, but for strongly exfoliated silicates distinct strain hardening is observed that increases with decreasing elongational rate. This behavior is particularly pronounced for polymers modified with maleic anhydrides and thought to be related to electrostatic forces between exfoliated platelets of the silicates and polymer molecules hindering molecular motions.

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填充固体颗粒的聚合物体系的熔融应变硬化：综述和补充实验结果

熔体应变硬化是聚合物拉伸流动的一个有趣特性。虽然许多未改性聚合物熔体的应变硬化已被广泛讨论，但还没有全面介绍颗粒对这一特性的影响。我们利用文献数据和自己的测量结果，对不同几何形状的固体颗粒的影响进行了比较。微小颗粒通常会降低熔体应变硬化，甚至可能导致应变变薄。据推测，这种行为是由于颗粒周围的剪切流成分以及聚合物基质的剪切变薄导致流动阻力减小。纳米级填料和层状硅酸盐纳米颗粒的影响更为复杂。弱剥离颗粒显示出与微填料类似的效果，但对于强剥离硅酸盐，则观察到明显的应变硬化，并随着伸长率的降低而增加。这种现象在马来酸酐改性的聚合物中尤为明显，并被认为与剥离的硅酸盐微粒和聚合物分子之间阻碍分子运动的静电力有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

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."