二氧化硅纳米颗粒对聚乙烯醇/银纳米线悬浮液流变特性和形貌的影响

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2021-11-30 DOI:10.1007/s13367-021-0025-x

Seung Hak Lee, Si Yoon Kim, Reza Salehiyan, Kyu Hyun

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引用次数: 3

摘要

研究了二氧化硅纳米颗粒(SiNPs)对聚乙烯醇(PVA)/银纳米线(AgNW)悬浮液流变特性和微观结构的影响。对于不含SiNPs的PVA/AgNW悬浮液，使用由小振幅振荡剪切(SAOS)试验确定的存储模量计算流变渗透阈值。SAOS测试结果显示，PVA/AgNW悬浮液有两种过渡浓度，导致不同的结构发展。在所有AgNW浓度下，大振幅振荡剪切(LAOS)试验的存储模量表现出双步应变软化行为，而老挝试验获得的弹性应力分量也表现出与存储模量相似的发展趋势。在大应变幅剪切作用下，观察到两种不同的结构。在PVA/AgNW混悬液中加入SiNPs后，PVA/AgNW混悬液的流变性能得到提高。老挝实验结果表明，PVA/AgNW悬浮液的储存模量和弹性应力分量与AgNW浓度有关。含SiNPs的PVA/AgNW悬浮液在低AgNW浓度下不存在双步应变软化现象，而在高AgNW浓度下存在双步应变软化现象。

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Effects of silica nanoparticles on the rheological properties and morphologies of polyvinyl alcohol/silver nanowire suspensions

We investigated the effects of silica nanoparticles (SiNPs) on the rheological properties and microstructures of polyvinyl alcohol (PVA)/silver nanowire (AgNW) suspensions. For PVA/AgNW suspensions without SiNPs, rheological percolation threshold was calculated using storage modulus determined by small amplitude oscillatory shear (SAOS) tests. Results from SAOS tests revealed that PVA/AgNW suspensions had two transition concentrations, which led to different structure developments. Storage modulus from large amplitude oscillatory shear (LAOS) tests showed double-step strain softening behavior at all AgNW concentrations tested, and elastic stress components, also obtained by LAOS tests, exhibited trends similar to storage modulus development. Furthermore, two distinguishable structures were observed when large strain amplitude shear was applied. When SiNPs were added to PVA/AgNW suspensions, the rheological properties of PVA/AgNW suspensions from SAOS tests increased. LAOS results showed storage modulus and elastic stress components of PVA/AgNW suspensions were dependent on AgNW concentration. Doublestep strain softening disappeared for PVA/AgNW suspensions containing SiNPs at low AgNW concentrations, whereas at high AgNW concentrations double-step strain softening behavior was observed.

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.