The combined effect of matrix molecular weight, filler concentration, and filler-matrix interactions on the dynamic viscoelasticity of polydimethylsiloxane/clay composites
{"title":"The combined effect of matrix molecular weight, filler concentration, and filler-matrix interactions on the dynamic viscoelasticity of polydimethylsiloxane/clay composites","authors":"Akanksha Gavendra, Asima Shaukat","doi":"10.1007/s00397-023-01417-9","DOIUrl":null,"url":null,"abstract":"<div><p>The macroscopic properties of particle-filled polymer melts depend sensitively on the state of particle dispersion and the structure and dynamics of the interfacial polymer layer, which, in turn, are governed by factors like polymer molecular weight (<i>M</i><sub><i>w</i></sub>), particle concentration (<i>C</i>), and particle-polymer interfacial interactions. However, the combined effect of these factors on the macroscopic properties is far from fully understood, especially for polymers filled with anisotropic particles. In this work, we investigate the combined effect of <i>M</i><sub><i>w</i></sub>, <i>C</i>, and polymer end-group (methyl, Me or hydroxyl, OH) on the dynamic viscoelastic behavior of polydimethylsiloxane (PDMS)/clay composites. The linear viscoelastic behavior of these composites follows a non-monotonic dependence on <i>M</i><sub><i>w</i></sub>, which varies considerably with a modification in <i>C</i> or the polymer end-group. Furthermore, for both Me-PDMS/clay and OH-PDMS/clay composites, the non-linear tests reveal either strain softening-hardening-softening or sustained softening beyond the linear regime, depending on the combination of <i>C</i> and <i>M</i><sub><i>w</i></sub>. The critical strains for the onset of softening and hardening vary differently with <i>M</i><sub><i>w</i></sub> for different combinations of<i> C</i> and the polymer end-group. Our results suggest that the morphology and rheological behavior of these composites are dictated by a complex interplay of various competing effects, namely, particle agglomeration, interfacial polymer packing and density, entanglements, and bridging interactions. These findings give insight into tailoring the properties of polymer composites by adjusting the combination of <i>C</i>, <i>M</i><sub><i>w</i></sub>, and particle-polymer interactions.</p><h3>Graphical abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 11-12","pages":"641 - 663"},"PeriodicalIF":2.3000,"publicationDate":"2023-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rheologica Acta","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s00397-023-01417-9","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MECHANICS","Score":null,"Total":0}
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Abstract
The macroscopic properties of particle-filled polymer melts depend sensitively on the state of particle dispersion and the structure and dynamics of the interfacial polymer layer, which, in turn, are governed by factors like polymer molecular weight (Mw), particle concentration (C), and particle-polymer interfacial interactions. However, the combined effect of these factors on the macroscopic properties is far from fully understood, especially for polymers filled with anisotropic particles. In this work, we investigate the combined effect of Mw, C, and polymer end-group (methyl, Me or hydroxyl, OH) on the dynamic viscoelastic behavior of polydimethylsiloxane (PDMS)/clay composites. The linear viscoelastic behavior of these composites follows a non-monotonic dependence on Mw, which varies considerably with a modification in C or the polymer end-group. Furthermore, for both Me-PDMS/clay and OH-PDMS/clay composites, the non-linear tests reveal either strain softening-hardening-softening or sustained softening beyond the linear regime, depending on the combination of C and Mw. The critical strains for the onset of softening and hardening vary differently with Mw for different combinations of C and the polymer end-group. Our results suggest that the morphology and rheological behavior of these composites are dictated by a complex interplay of various competing effects, namely, particle agglomeration, interfacial polymer packing and density, entanglements, and bridging interactions. These findings give insight into tailoring the properties of polymer composites by adjusting the combination of C, Mw, and particle-polymer interactions.
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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