Prediction of long‐term mechanical properties of PVDF/BaTiO<sub>3</sub> nanocomposite

Goodarzi, Vahabodin; Kokabi, Mehrdad; Razzaghi‐Kashani, Mehdi; Bahramian, Ahmad Reza

doi:10.1002/app.40596

Cited by 19 publications

(28 citation statements)

References 16 publications

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“…29,30 The calculations were done using reference temperature (T ref ) of 30 C on studied samples shown in Figure 7(d,f ). 29,30 The calculations were done using reference temperature (T ref ) of 30 C on studied samples shown in Figure 7(d,f ).…”

Section: Creep and Recovery Analysismentioning

confidence: 99%

“…The reason for this observation could be attributed to the hydrolysis of ester groups of PCL chains, leading to a decrease in molecular weight. 30 The variations in the storage modulus of PCL75PLA25HA3 after different hydrolytic times are shown in Figure 8(c). The storage modulus decreased with temperature and also with time of hydrolysis.…”

Section: Effect Of Time and Hydrolytic Degradation On Viscoelastic Prmentioning

confidence: 99%

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Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Shojaei

Nikuei

Goodarzi

et al. 2018

J of Applied Polymer Sci

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In this study, biodegradable polymer blends and their nanocomposites were prepared using poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) as blending components and hydroxyapatite (HA) nanoparticles as reinforcement. X-ray diffraction spectra showed that the presence of HA nanoparticles enhanced the intensity of the peaks (100) and (200) corresponding to the PCL's crystalline planes. The transmission electron microscopy images confirmed the high tendency of HA nanoparticles to locate in the PLA phase. The water uptake values of samples measured at pH 4 were more than those measured at other pH values. The weight loss behavior of blends in acidic medium was completely different from that in basic and neutral media. The Williams-Landel-Ferry equation and time-temperature superposition principle were applied to the creep compliance of the samples and their master curves were determined at reference temperature of 30 C, and the mechanical properties of samples were predicted in other conditions. The effect of pH on the creep-recovery response of studied samples was analyzed. From this analysis, it could be found that at pH 4, the creep stain increased, while, at pH 7, there was no a significant change in the viscoelastic property.

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Section: Creep and Recovery Analysismentioning

confidence: 99%

Section: Effect Of Time and Hydrolytic Degradation On Viscoelastic Prmentioning

confidence: 99%

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Shojaei

Nikuei

Goodarzi

et al. 2018

J of Applied Polymer Sci

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“…The TTS principle and Williams‐Landel‐Ferry (WLF) equations were used to obtain master curves at some reference temperatures. According to the generated creep compliance master curves, the creep compliance of the developed nanocomposites was predicted for about 10 years …”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and prediction of viscoelastic creep properties of PP/EVA/LDH nanocomposites using master curves based on time–temperature superposition

Mahdavi

Goodarzi

Khonakdar

et al. 2018

J of Applied Polymer Sci

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Prediction of viscoelastic behavior of polymers over a long‐term period is of vital importance for engineering applications. An attempt was made to uncover the interplay between the morphology and viscoelastic behavior of compatibilized polypropylene/ethylene vinyl acetate (EVA) copolymer blends in the presence of layered double hydroxide (LDH) nanoplatelets. The time–temperature superposition (TTS) principle and WLF equations were merged to obtain master curves of storage modulus at defined reference temperatures enabling prediction of storage modulus at high frequency ranges which are not experimentally measureable. Moreover, the creep compliance master curves were acquired for different reference temperatures to predict the creep compliance of nanocomposites over long period of times. It was found that the presence of LDH decreases the creep compliance at long period of times while it decreases the unrecoverable deformation of EVA domains. A simple mechanism was proposed to explain the creep and recovery behavior of samples blend at different temperatures. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46725.

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“…The shift factor a T (defined in Eq . ) is an important parameter in the TTS method, which can be obtained through the well‐known WLF Equation expressed as :

\log a_{T} = \frac{- C_{1} (T - T_{0})}{C_{2} + (T - T_{0})}

…”

Section: Theoretical Backgroundsmentioning

confidence: 99%

“…Commonly, T 0 is taken as T g , in that case the C 1 and C 2 constants are equal to 17.44 and 51.6, respectively. The WLF constants for other reference temperatures can be obtained from the following equations:

C_{1}^{T_{0}} = \frac{C_{1}^{T g} C_{2}^{T g}}{(C_{2}^{T g} + (T_{0} - T_{g}))}

C_{2}^{T_{0}} = C_{2}^{T g} + (T_{0} - T_{g})

where

C_{1}^{T g}

and

C_{2}^{T g}

are the C 1 and C 2 constants at T g , respectively . At temperatures above the reference temperature ( T 0 ), the curve is shifted to the right‐side hand with a negative shift factor (log a T < 0), while for lower temperatures the curve is shifted to the left‐side with a positive shift factor (log a T > 0).…”

Section: Theoretical Backgroundsmentioning

confidence: 99%

Prediction of mechanical properties of PP/EVA polymer blends governed by EVA phase change in the presence of environmentally‐friendly inorganic tungsten disulfide nanotubes (INT‐WS₂)

et al. 2018

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Anticipating dynamic mechanical behavior of polymeric materials over long period of time and under different frequencies is the first step to be taken to afford load‐bearing applications. Nevertheless, what we know about dynamic mechanical behavior of polymers is only limited to experiments, which necessitates large pools of data spending too much money, time, and energy. Environmentally‐friendly inorganic tungsten disulfide nanotube (INT‐WS2), was introduced to polypropylene/ethylene vinyl acetate copolymer (PP/EVA, 75/25 wt/wt) blends through melt mixing, and dynamic mechanical analysis (DMA) frequency sweep tests were performed to obtain master curves based on time‐temperature superposition (TTS) theorem. The influence of EVA phase change (solid, semi solid, and melt domains) on the creep and recovery behavior of nanocomposites in linear region was then studied. It was found that using INT‐WS2 along with PP‐g‐MA results in distinctive improvement in creep‐recovery response of nanocomposites. Burger and Weibull models were used to mimic viscoelastic behavior of the nanocomposites. Creep compliance master curves predicted creep compliance, while analysis of cyclic creep‐recovery at 30 °C revealed almost constant permanent strain parameters for sample having 5 wt% INT‐WS2 and PP‐g‐MA after three times repeating test cycles. Influence of phase change phenomenon of EVA domains on creep‐recovery behavior of nanocomposites was mechanistically demonstrated. POLYM. COMPOS., 40:1964–1978, 2019. © 2018 Society of Plastics Engineers

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Prediction of long‐term mechanical properties of PVDF/BaTiO₃ nanocomposite

Cited by 19 publications

References 16 publications

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Experimental analysis and prediction of viscoelastic creep properties of PP/EVA/LDH nanocomposites using master curves based on time–temperature superposition

Prediction of mechanical properties of PP/EVA polymer blends governed by EVA phase change in the presence of environmentally‐friendly inorganic tungsten disulfide nanotubes (INT‐WS₂)

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Prediction of long‐term mechanical properties of PVDF/BaTiO3 nanocomposite

Cited by 19 publications

References 16 publications

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Experimental analysis and prediction of viscoelastic creep properties of PP/EVA/LDH nanocomposites using master curves based on time–temperature superposition

Prediction of mechanical properties of PP/EVA polymer blends governed by EVA phase change in the presence of environmentally‐friendly inorganic tungsten disulfide nanotubes (INT‐WS2)

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Prediction of long‐term mechanical properties of PVDF/BaTiO₃ nanocomposite

Prediction of mechanical properties of PP/EVA polymer blends governed by EVA phase change in the presence of environmentally‐friendly inorganic tungsten disulfide nanotubes (INT‐WS₂)