Thermal and dynamic mechanical properties of PP/EVA nanocomposites containing organo-modified layered double hydroxides

Rafiee, Faezeh; Otadi, Mahmood; Goodarzi, Vahabodin; Khonakdar, Hossein Ali; Jafari, Seyed Hassan; Mardani, Elham; Reuter, Uta

doi:10.1016/j.compositesb.2016.08.013

Cited by 50 publications

(30 citation statements)

References 27 publications

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“…The effect of HA nanoparticles on the morphology of PCL75PLA25 sample is investigated in Figure 3(g-j). [26][27][28] According to the SEM images of Figure 3(i,j), it is seen that the presence of 3 wt % HA nanoparticles more decreases in compare with pure blend, the PLA domain sizes as a results of increasing the interaction between two phases, and therefore the density of dispersed PLA domains is significantly increased. As expected, the addition of nanoparticles reduced particle sizes and improved the dispersion of minor phases.…”

Section: Microstructure Analysismentioning

confidence: 96%

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: Microstructure Analysismentioning

confidence: 96%

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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“…There are sufficient works focused on different aspects of PP/EVA blends containing organo‐modified montmorillonite (OMMT) . The use of organo‐modified layered double hydroxide (LDH) on morphological, thermal, and mechanical properties of PP/EVA blends was also studied in a number of previous investigations of this group . Overall, LDHs because of their typical metal‐hydroxide‐like chemistry and conventional clay‐like layered crystalline structure through endothermic decomposition and char formation donate higher thermal stability and flame properties to polymeric matrix and therefore it can be a better candidate for improving creep resistance purpose at high temperatures as compared to OMMT with limited thermal stability …”

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 crystallinity degree ( X c ) of the PP matrix phase is calculated by using the following equation :

X_{normalc} = Δ H_{normalc} / false(W_{normali} \times Δ H_{0} false)

where Δ H c is the enthalpy of crystallization and the value measured by the DSC crystal curves, W i is the mass fraction of PP in experiment materials, Δ H 0 is the enthalpy of complete crystallization (perfect crystal) of PP and the value is 187.7 J/g .…”

Section: Resultsmentioning

confidence: 99%

Influence of montmorillonite on the properties of halogen–antimony flame retardant polypropylene composites

Zhang

Niu

et al. 2018

Polymer Composites

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In order to improve the flame retardant properties of polypropylene, MMT/nano‐Sb2O3/BEO/PP‐based composites were prepared by melt blending method after mechanical ball mixing by using a high energy ball milling technique. The crystallization performance, flame retardant performance, and tensile strength of the composites were investigated, and the flame‐retardant mechanism was analysed. The results show that montmorillonite (MMT) can improve not only the tensile strength of polypropylene composites, but also the flame retardant performance basing on increasing of the intensity of residual carbon layer. Incorporation of 13 wt% of BEO, 7 wt% of nano‐Sb2O3 and 7 wt% of MMT within PP matrix resulted in excellent frame retardant properties, which the LOI value of MMT/nano‐Sb2O3/BEO/PP composites increased to 27.9% and the falme retardant grade reached V‐0 grade in UL‐94 testing. Meanwhile, The crystallinity and tensile strength of the composites are better than those of pure PP. The addition of MMT can reduce the using amount of BEO on the basis of improving the flame retardant performance and tensile strength. POLYM. COMPOS., 2019. © 2019 Society of Plastics Engineers

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Thermal and dynamic mechanical properties of PP/EVA nanocomposites containing organo-modified layered double hydroxides

Cited by 50 publications

References 27 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

Influence of montmorillonite on the properties of halogen–antimony flame retardant polypropylene composites

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