Application of mean-field theory in PP/EVA blends by focusing on dynamic mechanical properties in correlation with miscibility analysis

Razavi, Masoud; Khonakdar, Hossein Ali; Jafari, Seyed Hassan

doi:10.1016/j.compositesb.2015.04.026

Cited by 31 publications

(23 citation statements)

References 22 publications

(27 reference statements)

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“…Five different test frequencies were used in this study (0.5, 1, 5, 10, and 20 HZ). It has been suggested to interrelate the change of glass transition temperature with test frequencies using the Arrhenius equation . According to classic Arrhenius equation, the molecular relaxation time can be expressed as:

τ = τ_{0} e^{\frac{Δ E - γ σ}{R T}}

where △ E and σ are activation energy of relaxation and the stress, respectively, τ 0 is the hypothetical relaxation time at an infinite temperature, T is the absolute temperature, γ is the variable, and R is the gas constant.…”

Section: Resultsmentioning

confidence: 99%

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Effect of in situ reactive interfacial compatibilization on structure and properties of polylactide/sisal fiber biocomposites

Hao

2017

Polymer Composites

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The interfacial property is of great importance for polymer composites materials. In this study, polylactide (PLA) and sisal fibers (SF) were melt‐blended to fabricate bio‐based composites via in situ reactive interfacial compatibilization with addition of triglycidyl isocyanurate (TGIC). The interfacial adhesion between PLA matrix and sisal fibers was improved, which was confirmed by scanning electron microscope characterization. TGIC played a hinge‐like role between fibers and matrix, which bonded the PLA molecular chain to the fiber surface. FTIR analysis after Soxhlet extraction demonstrated the bonding of PLA molecular chain to the fiber surface. At the same time, the interfacial reaction and microstructures of composites were further investigated by thermal and rheological analyses. Differential scanning calorimetry and dynamic rheological measurement indicated that the mobility of the PLA molecular chain in composites was restricted because of introduction of TGIC, which also reflecting the improved interfacial interaction between sisal fibers and PLA matrix. The tensile properties of composites were improved because of improved interfacial adhesion between sisal fibers and PLA matrix. POLYM. COMPOS., 39:E174–E187, 2018. © 2017 Society of Plastics Engineers

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τ = τ_{0} e^{\frac{Δ E - γ σ}{R T}}

Section: Resultsmentioning

confidence: 99%

“…Five different test frequencies were used in this study (0.5, 1, 5, 10, and 20 HZ). It has been suggested to interrelate the change of glass transition temperature with test frequencies using the Arrhenius equation [33,34]. According to classic Arrhenius equation, the molecular relaxation time can be expressed as:…”

Section: Dma Characterizationmentioning

confidence: 99%

Effect of in situ reactive interfacial compatibilization on structure and properties of polylactide/sisal fiber biocomposites

Hao

2017

Polymer Composites

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“…The first two peaks relate to the bulk relaxation of PP and EVA and the third one and its tendency to get upwards at higher relaxation times can be attributed to the shape relaxation of dispersed PP domains within the EVA matrix. In our previous study on miscibility of PP/EVA blends, it was indicated that miscibility of PP/EVA blends is mainly due to the penetration of EVA chains within the PP molecules [8]. Therefore, the increase in height of PP relaxation peaks can be attributed to miscibility of high viscous EVA chains with PP.…”

Section: Glve Model Approachmentioning

confidence: 97%

“…These features turn them as the most versatile commodity polymers. However, both of these polymers have some drawbacks, such as low impact strength for PP and low modulus for EVA [8]. Their complementary properties, i.e., low impact strength and high modulus of PP and low modulus and high impact strength of EVA, along with good compatibility between these materials in melt state, make them as a suitable pair to produce polyolefinic materials with adjustable balance of properties.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic oscillatory rheological properties of PP/EVA/organo-modified LDH ternary hybrids based on generalized Newtonian fluid and generalized linear viscoelastic approaches

et al. 2016

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A comprehensive investigation was performed on single-step melt processed polypropylene (PP)/(ethylene vinyl acetate copolymer (EVA)/organo-modified layered double hydroxide (LDH) counterpart ternary hybrids to explore the effect of LDH loading on small-amplitude oscillatory shear (SAOS) rheological properties and to correlate the properties with microstructure. The rheological results were analyzed in detail from qualitative and quantitative perspectives. Using qualitative interoperation of storage modulus and complex viscosity alteration against LDH loading, and also quantitative analysis by viscosity models based on both the generalized Newtonian fluid (GNF) and generalized linear viscoelastic (GLVE) approaches, detailed predictions were carried out on the microstructure of samples and also partitioning of the organo-modified LDH particles and their intercalation and exfoliation extent within hybrids. By comparing the elasticity and relaxation spectrum of PP-rich/LDH with those of EVA-rich/LDH hybrids, it was predicted that organo-modified LDH platelets, in the case of PP-rich samples, have been located at the interface or within the EVA dispersed particles, while in the case of EVA-rich samples, they mainly localized within the matrix. In addition, the crossover frequency and slope of G 0 and G 00 curve at terminal region were correlated with the extent of intercalated and exfoliated structures of filler. The validity of these predictions on microstructure of the developed hybrids was confirmed visually using transmission electron microscope (TEM) micrographs.

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“…It is noted that while T g represents the relationship between the mobility of polymer chains and temperature, peak temperature is decreased by about 6 2 78C when frequency goes from 1 to 50 Hz. It has been suggested that it is possible to interrelate the temperature at which a relaxation process is observed with the frequency of excitation (ƒ) by the Arrhenius equation (especially over a limited frequency range), which predicts change in relaxation time as the glass transition is approached from above T g due to the decrease of free volume [29,30]. According to the classic Arrhenius equation, molecular relaxation time(s) may be expressed as follows:…”

Section: Calculation Of the Activation Energymentioning

confidence: 99%

Study on dynamic mechanical, thermal, and mechanical properties of long glass fiber reinforced thermoplastic polyurethane/poly(butylene terephthalate) composites

Zhang

Qin

et al. 2016

Polymer Composites

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Long glass fiber reinforced thermoplastic polyurethane and Poly (butylene terephthalate) (PBT) (LGFTP) composites with different ratios of TPU and PBT were prepared by using self-designed impregnation device. The dynamic mechanical, thermal, and mechanical properties of LGFTP composites were studied. Results showed that there was good compatibility between TPU and PBT. Dynamic mechanical thermal analysis (DMA) results indicated that the TPU content and scanning frequencies had some influence on dynamic mechanical properties and glass transition of LGFTP composites. In addition, the Arrhenius relationship has been used to calculate the activation energy of atransition of the composites. Differential scanning calorimetry (DSC) analysis indicated that with increasing TPU content the crystallization temperature (T c ), the melting point (T m ), and the percent crystallinity (X c ) decreased. Both TG and DTG curves of the LGFTP composites are shifted to lower temperatures with the increasing of TPU content. Mechanical properties showed that the addition of TPU could lead to a remarkable increase tensile and notched izod impact strength with a small reduction in flexural strength and modulus of LGFTP composites. POLYM. COMPOS., 00:000-000,

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Application of mean-field theory in PP/EVA blends by focusing on dynamic mechanical properties in correlation with miscibility analysis

Cited by 31 publications

References 22 publications

Effect of in situ reactive interfacial compatibilization on structure and properties of polylactide/sisal fiber biocomposites

Effect of in situ reactive interfacial compatibilization on structure and properties of polylactide/sisal fiber biocomposites

Analysis of dynamic oscillatory rheological properties of PP/EVA/organo-modified LDH ternary hybrids based on generalized Newtonian fluid and generalized linear viscoelastic approaches

Study on dynamic mechanical, thermal, and mechanical properties of long glass fiber reinforced thermoplastic polyurethane/poly(butylene terephthalate) composites

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