Correlation Between Thermal Diffusivity and Dynamic Mechanical Properties of Soft Magnetic Particle Filled Thermoplastic Composites

2011 ◽  
Author(s):  
S. Kirchberg ◽  
M. Anhalt ◽  
B. Weidenfeller
Keyword(s):  
Thermal Diffusivity ◽  
Storage Modulus ◽  
Filler Particle ◽  
Free Path Length ◽  
Dynamic Mechanical Properties ◽  
Thermoplastic Composites ◽  
Flash Method ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Measurement ◽  
Filler Fraction

Measurements of thermal diffusivity α by laser flash method (LFA) and storage modulus E′ by dynamic mechanical analysis (DMA) have been performed on polypropylene-iron silicon (PP/FeSi6.8) composites with filler particle content from 10 vol.-% to 60 vol.-% at temperatures from 300 K to 415 K and 200 K to 425 K, respectively. The thermal diffusivity induces a decline with increased temperature for all examined materials. The drop in thermal diffusivity versus temperature corresponds with the filler fraction. Observing the behavior of the storage modulus of FeSi6.8 filled PP one can show that the larger the filler fraction of particles in the polymer the stronger is the decrease of storage modulus versus temperature. The inflection point of the dynamic mechanical measurement curve at about 360 K corresponds very well with starting increase of thermal conductivity. The achieved results can be explained by the relation of the velocity v of phonons and its free path length l to the thermal diffusivity α according to α = (1/3)vl (Einstein approximation). Moreover, v is correlated to the bulk modulus K (and specific density ρ) via v ≈ (K/ρ)0.5.

Preparation of high-strength SEBS nanocomposites reinforced with halloysite nanotube: Effect of SEBS-g-MA compatibilizer

2019 ◽  
Vol 33 (10) ◽  
pp. 1336-1357 ◽  
Author(s):  
Nazlı Arman ◽  
Emre Tekay ◽  
Sinan Şen
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Maleic Anhydride ◽  
Storage Modulus ◽  
Tensile Modulus ◽  
Dynamic Mechanical Properties ◽  
Thermal Stabilities ◽  
Halloysite Nanotube ◽  
Dynamic Mechanical ◽  
Strength And Toughness

Poly(styrene -b-ethylene- co-butylene -b-styrene) (SEBS)/organophilic halloysite nanotube (Org-HNT) nanocomposites were prepared by solution mixing and then compression molded. Maleic anhydride grafted SEBS (SEBS- g-MA) was also used as a compatibilizer in preparation of SEBS/SEBS- g-MA/Org-HNT ternary nanocomposites. Surface morphologies and both static and dynamic mechanical analyses as well as thermal stabilities of the nanocomposites were carried out. Both the binary and ternary nanocomposites exhibited higher tensile moduli, tensile strength, and toughness values compared to neat SEBS. The elastic modulus was found to increase about 385% and 320% with addition of 3 and 5 phr Org-HNT into the SEBS matrix, respectively, while the maximum toughness was achieved via SEBS-5H composite with an increase of 45%. The ternary nanocomposite having 3 phr Org-HNT and 10 phr SEBS- g-MA (3H10SMA) gave about a 325% and 103% increase in the elastic modulus and toughness, respectively, together with a 75% increase in the tensile strength as the maximum value. This result was ascribed to interactions of the surface of the nanotubes with the maleic anhydride (MA) group of the compatibilizer. The same nanocomposite was also found to have two times higher dynamic storage modulus at 25°C than neat SEBS and almost the same damping value, which is an indication of improvement in the elastic character of SEBS without impairing its damping ability. Although a much higher damping value was obtained via use of 20 phr SEBS- g-MA with the same amount of nanotubes, the corresponding storage modulus decreased too much, close to that of neat SEBS. The enhanced tensile modulus, strength, and toughness of the 3H10SMA nanocomposite, which is consistent with its dynamic mechanical properties, indicate a good balance between the toughness/damping and stiffness. Moreover, all the nanocomposites exhibited better thermal stabilities than neat SEBS, showing higher midpoint degradation temperatures and peak maximum temperatures at which the maximum degradation occurs.

Mean-Field Calculations of the Dynamic Mechanical Properties of Heterogeneous Elastomer Blends

1989 ◽  
Vol 62 (2) ◽  
pp. 305-314 ◽  
Author(s):  
K. A. Mazich ◽  
P. C. Killgoar ◽  
J. A. Ingram
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Glass Transition ◽  
Storage Modulus ◽  
Theoretical Calculations ◽  
Mean Field ◽  
Dynamic Mechanical Properties ◽  
Particle Model ◽  
Dynamic Mechanical ◽  
Grain Model

Abstract A method for calculating the dynamic mechanical properties of elastomer blends with co-continuous structures has been presented. The calculations are based on Kerner's packed-grain model for composite media. Comparisons of theoretical calculations with experimental data show that this model closely approximates the viscoelastic properties of blends with a co-continuous structure, at least in the glass-transition regions of the respective blend components. We have also shown that the storage modulus of co-continuous blends may be well-represented by a discrete-particle model. This result can be misleading, however, if the storage modulus alone is calculated and compared with experimental data. A comparison of viscoelastic data (log E′ and tan δ) with calculation clearly distinguishes the models and indicates that the packed-grain model is the correct representation of the structure of co-continuous blends. The agreement between theory and experiment reported above was principally found in the glass-transition regions of the respective components in the elastomer blend. We extended the comparison well into the rubbery region and found that the agreement between Kerner's mean-field theory and the experimental data was poor, particularly for the loss tangent. Different relaxation mechanisms (relaxations over greater periods of time) are available to the blend in the rubbery region of viscoelastic response, and these mechanisms are apparently not accounted for in the mean-field calculations.

Study on Dynamic Mechanical Properties of n-HA/PA66 Composites

2011 ◽  
Vol 418-420 ◽  
pp. 1511-1515
Author(s):  
Lin Cheng ◽  
Xiang Zhang ◽  
Yu Bao Li
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Loss Modulus ◽  
Physiological Saline ◽  
Dynamic Mechanical Properties ◽  
Intrinsic Properties ◽  
Polyamide 66 ◽  
Dynamic Mechanical ◽  
Reinforcing Effects

The dynamic mechanical properties of nano-hydroxyapatite (n-HA) reinforced polyamide 66 (PA66) biocomposites were studied with reference to the effect of n-HA content, frequency and physiological saline. The intrinsic properties of the components, morphology of the system and the nature of interface between the phases determine the dynamic mechanical properties of the composite. The storage modulus (E') values of n-HA/PA66 composites were much higher than those of pure PA66, indicating that the incorporation of n-HA in PA66 matrix induced reinforcing effects obviously. And the E' values of composites increased with increasing of n-HA content. The loss modulus (E") of the composite with 30wt% n-HA was higher that those of pure PA66 and the composite with 40wt% n-HA below 55°C, however, above 55°C, the E" values enhanced with increase of n-HA content. Both frequency and physiological saline had obvious effects on the dynamic mechanical properties for n-HA/PA66 composite. E' and E" values enhanced with increase of frequency, but tanδ values decreased with increasing of frequency. After soaked in physiological saline, the E' and E" values of the composite decreased.

Effect of Nanoclay on the Dynamic Mechanical Properties of Styrene Butadiene and Acrylonitrile Butadiene Rubber Vulcanizates

2005 ◽  
Vol 78 (2) ◽  
pp. 321-335 ◽  
Author(s):  
Susmita Sadhu ◽  
Anil K. Bhowmick
Keyword(s):  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Filler Loading ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Dynamic Mechanical ◽  
Acrylonitrile Butadiene Rubber ◽  
Montmorillonite Clays ◽  
Styrene Butadiene ◽  
And Storage

Abstract Nanocomposites based on Styrene Butadiene Rubber (SBR) and Acrylonitrile Butadiene Rubber (NBR) with varying acrylonitrile contents (19%, 34% and 50%, respectively) and octadecyl amine modified and unmodified Na-Montmorillonite clays were prepared. Dynamic mechanical thermal analysis (DMTA) was performed on these composites over a range of temperatures (−80 °C to +80 °C), frequencies (0.032 Hz to 32 Hz) and strains (0.001% to 10%). The results showed that there were significant changes in tan delta peak temperature and height and storage modulus with the addition of small amount (4 phr) of the modified and the unmodified fillers. These were magnified with the increase of filler loading. The tan delta peak heights decreased and the storage modulus increased in general. With increasing strain, the nanocomposites showed lowering of storage modulus, because of the breakdown of the agglomerated structures. The torage modulus increased with increasing frequency, and the modified filler loaded samples registered higher E' values compared to those of the gum rubber.

DYNAMIC MECHANICAL PROPERTIES OF NANOCOMPOSITES WITH POLY (VINYL BUTYRAL) MATRIX

2010 ◽  
Vol 24 (06n07) ◽  
pp. 805-812 ◽  
Author(s):  
A. M. TORKI ◽  
I. ŽIVKOVIĆ ◽  
V. R. RADMILOVIĆ ◽  
D. B. STOJANOVIĆ ◽  
V. J. RADOJEVIĆ ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Titania Nanoparticles ◽  
Mixing Process ◽  
Melt Mixing ◽  
Dynamic Mechanical ◽  
The Matrix ◽  
Silica And Titania ◽  
Vinyl Butyral

This work reports the preparation of SiO 2 and TiO 2/poly (vinyl butyral) nanocomposites with enhanced dynamic mechanical properties. Silica and titania nanoparticles were introduced in the matrix as the neat powder and as colloidal sol using the melt mixing process. Composites reinforced with colloidal sol silica and titania showed higher mechanical properties than the ones reinforced with as-received particles. When sol TiO 2 particles are used, the highest increase of storage modulus of about 54% is obtained for 5 wt% loading, while for sol SiO 2, the storage modulus increases with the addition of nanosilica with the largest increase of about 99% for 7 wt% loading. In addition, nanocomposites were introduced within Kevlar/PVB composites. The addition of 5 wt% silica and titania colloidal sol lead to the remarkable increase of the storage modulus for about 98 and 65%, respectively. Largest contribution of nanoreinforcements in lowering the glass transition temperature is observed for 7 wt% loading of TiO 2 and SiO 2 colloidal sol.

Thermal and dynamic mechanical analysis of hybrid jute/sisal fibre reinforced epoxy composite

2016 ◽  
Vol 232 (9) ◽  
pp. 743-748 ◽  
Author(s):  
MK Gupta
Keyword(s):  
Thermal Properties ◽  
Storage Modulus ◽  
Hybrid Composites ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Decomposition Temperature ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Sisal Fibre ◽  
Dynamic Mechanical

The aim of the present study is to investigate the dynamic mechanical and thermal properties of hybrid jute/sisal fibre reinforced epoxy composites. The hybrid composites were prepared by hand layup technique having total fibre loading of 30% by weight with different weight ratios of jute and sisal fibres. Dynamic mechanical properties such as storage modulus ([Formula: see text]), loss modulus ([Formula: see text]) and damping ([Formula: see text]) were investigated in the temperature range of 30–200 ℃. The thermal stability of the prepared composites was studied using thermogravimetric analysis. Other thermal properties such as glass transition temperature ( Tg), crystallization temperature ( Tc) and decomposition temperature ( Td) were also obtained by differential scanning calorimetry. The results indicated a positive effect of hybridization in terms of increase in dynamic mechanical and thermal properties. Storage modulus, loss modulus and Tg were found to be higher for hybrid composite having a higher percentage of jute fibres.

Study of Microstructure and Dynamic Mechanical Analysis of Biodegradable Tableware Produced with Corn Straw

2011 ◽  
Vol 380 ◽  
pp. 160-163 ◽  
Author(s):  
Alun ◽  
Zhi Hui Sun ◽  
Quan Rong Jing ◽  
Ri Dun Hu ◽  
Chun Li Yang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Dynamic Mechanical Property ◽  
Corn Straw ◽  
Dynamic Mechanical ◽  
Scan Electronic Microscope ◽  
Electronic Microscope

This paper focused on biodegradable tableware processed with plant fiber, which were obtained by mechanical processing corn straw, abundant in Heilongjiang Province of China. Firstly, the microstructure characteristics of tableware were described by Scan Electronic Microscope (SEM). Secondly, the dynamic mechanical property of biodegradable tableware was analyzed by DMA, which will provide a reference to optimize the biodegradable tableware design in future. And the dynamic mechanical property of biodegradable tableware also was compared with the dynamic mechanical properties of the plastic snack box. The results showed that biodegradable tableware had a highly storage modulus (E′) originally, it was 3216MPa,while the maximum storage modulus (E′) of plastic snack box was 852MPa. And the results also indicated that the treat temperature has a significant effect on the dynamic mechanical properties of biodegradable tableware, as the treat temperature increased closely to 95°C, the biodegradable tableware appeared glassy transition, but the storage modulus (1650MPa) was still much higher than that of the plastic snack box.

scholarly journals Dynamic mechanical analysis of nylon 6 fiber-reinforced acrylonitrile butadiene rubber composites

2021 ◽  
pp. 096739112110461
Author(s):  
C Rajesh ◽  
P Divia ◽  
S Dinooplal ◽  
G Unnikrishnan ◽  
E Purushothaman
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Damping Factor ◽  
Butadiene Rubber ◽  
Bonding Agents ◽  
Fiber Loading ◽  
Dynamic Mechanical ◽  
Acrylonitrile Butadiene Rubber

Dynamic mechanical properties of polymeric materials are of direct relevance to a range of unique polymer applications. The aim of the study is to investigate the dynamic mechanical properties of composites of short nylon 6 fiber with acrylonitrile butadiene rubber (NBR). The storage modulus (G′), loss modulus (G″), and the damping factor (tan δ) have been analyzed with reference to the effects of fiber loading, curing systems, and bonding agents over a range of temperature and at varying frequencies. The storage modulus increases with increment in fiber loading, whereas loss modulus and damping factor decrease. The glass transition temperature shifts to higher temperature upon increment in fiber loading. Dicumyl peroxide (DCP)–cured composites show higher storage modulus and lower damping than the corresponding sulfur-cured one. The addition of hexa-resorcinol and phthalic anhydride as bonding agents enhances the dynamic mechanical properties of the composites. The experimental results have been evaluated by comparing with Einstein, Guth, and Nielsen models.

Dynamic mechanical behavior of composite materials reinforced by graphene and huntite minerals

2021 ◽  
Vol 63 (12) ◽  
pp. 1090-1096
Author(s):  
Dilek Atilla ◽  
Binnur Gören
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Storage Modulus ◽  
Loss Modulus ◽  
Damping Ratio ◽  
Weight Percent ◽  
Dynamic Mechanical Properties ◽  
Grain Structure ◽  
Dynamic Mechanical ◽  
Pure Resin

Abstract The aim of this study is to investigate the dynamic mechanical properties of composite materials reinforced by mineral experimentally. Graphene and huntite minerals were added to epoxy resin at different weight ratios (wt.-%) as 0.5 weight percent, 1 weight percent and 3 weight percent, to examine the effect of mineral types and percentages on the resulting dynamic mechanical properties. In addition, the effect of non-layered huntite unlike graphene, with a nano-sized grain structure, was investigated. Thus, glass transition temperature (Tg), storage modulus (E’), loss modulus (E”) and damping ratio (tan δ) values were determined and compared. Moreover, a tensile test was performed in order to explain the relation between stress and strain. It was seen that adding different minerals caused different results according to types and proportions. In general, adding minerals to the pure resin increased the storage modulus and loss modulus, whereas the damping ratio (tan δ) decreased compared to the pure resin.

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