Dynamic mechanical behavior of phenoxy/carbon nanotube composites: assessment through different functionalization

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Mahdi Najjar Disfani ◽  
Seyed-Hassan Jafari ◽  
Hossin Ali Khonakdar
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Melt Mixing ◽  
Dynamic Mechanical ◽  
Transmission Electron ◽  
Dispersion State ◽  
Nanotube Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Abstract Nanocomposites of phenoxy resin with various functionalized multi-walled carbon nanotubes (CNTs) were investigated to assess and compare the effect of functionalization on dynamic mechanical properties. Non-functionalized and various functionalized CNTs containing -COOH, -OH, and -NH2 groups were utilized for preparing phenoxy/CNT nanocomposites through a melt mixing process. Dynamic mechanical properties of nanocomposites, storage modulus (E′), and loss tangent (tanδ) data in temperature range of 20–120°C were collected. Transmission electron microscopy and optical microscopy were also used to gain an insight into the CNTs dispersion state within phenoxy matrix. The functionalized CNTs had no adverse effect on storage modulus of phenoxy. The morphological investigation revealed the highest degree of agglomeration and the shortest tube lengths for the CNT-COOH within phenoxy matrix.

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.

Enhanced thermal, static, and dynamic mechanical properties of multi-walled carbon nanotubes-reinforced acrylonitrile butadiene styrene nanocomposite

2019 ◽  
pp. 089270571988601 ◽  
Author(s):  
Sahil Kapoor ◽  
Meenakshi Goyal ◽  
Prashant Jindal
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Thermal Expansion ◽  
Acrylonitrile Butadiene Styrene ◽  
Dynamic Mechanical Properties ◽  
Gravimetric Analysis ◽  
Dynamic Mechanical ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Butadiene Styrene

Nanocomposites of acrylonitrile butadiene styrene (ABS) with multi-walled carbon nanotubes (MWCNTs) have been fabricated using a facile solution blending technique with the variable weight of MWCNTs in ABS within a range of 1–5 wt% in the ABS/MWCNTs nanocomposites. Morphological characterization using field emission scanning electron microscope has shown uniform dispersion of MWCNTs in the nanocomposites. Thermal gravimetric analysis has shown improved thermal degradation stability for 5 wt% ABS/MWCNTs nanocomposites in comparison to pure ABS. Thermal expansion analysis of ABS/MWCNTs nanocomposites also showed a significant reduction in thermal strain and coefficient of thermal expansion (CTE) in comparison to pure ABS, with the 5 wt% sample showing a maximum reduction in thermal expansion properties. Mechanical characterization for 5 wt% ABS/MWCNTs nanocomposite, using nanoindentation, showed significant improvement in elastic modulus (90%) and hardness (99%) in comparison to pure ABS. The dynamic mechanical properties of 5 wt% ABS/MWCNTs nanocomposites also showed significant improvement with storage modulus and hardness improving by 153% and 342%, respectively, in comparison to pure ABS. These enhanced thermal and mechanical properties of ABS/MWCNTs nanocomposites enable their applications for a wider scope in various areas of engineering-based application, especially in the automobile industry.

Dynamic Thermo-Mechanical Properties of Chemically Surface Modified MWCNTs Reinforced Polymeric Composites

2007 ◽  
Vol 26-28 ◽  
pp. 285-288 ◽  
Author(s):  
Abu Bakar Sulong ◽  
Joo Hyuk Park
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Polymeric Composites ◽  
Matrix Composites ◽  
Chemical Surface ◽  
Dynamic Mechanical Thermal Analyzer ◽  
Thermal Analyzer ◽  
Multi Walled Carbon Nanotubes ◽  
Surface Modified ◽  
Walled Carbon Nanotubes

The dynamic thermo-mechanical properties of two types of chemically surface modified (Carboxylated and Octadecylated) multi-walled carbon nanotubes (MWCNTs) and As produced MWCNTs reinforced epoxy matrix composites are investigated by Dynamic Mechanical Thermal Analyzer at 1.0 wt% concentration. Moreover, influence of MWCNTs concentration variations to the dynamic thermo-mechanical properties are evaluated at Carboxylated MWCNT reinforced polymeric composites (from 0.1 to 5.0 wt %). Higher interfacial bonding strength is achieved by introducing the chemical surface modification. Also MWCNTs reinforced polymer shows higher storage modulus (from 30°C to 70°C) than pure polymer. Moreover, the storage modulus of composites increases linearly by increasing MWCNTs concentration. However, glass transition temperature (Tg) of composites decreases linearly by increasing MWCNTs concentration.

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.

Mixing Methods Influencing on Properties of Epoxidized Natural Rubber/Polypropylene Thermoplastic Vulcanizates

2013 ◽  
Vol 844 ◽  
pp. 109-112 ◽  
Author(s):  
Chesidi Hayichelaeh ◽  
Charoen Nakason ◽  
Anoma Thitithammawong
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Dynamic Mechanical Properties ◽  
Epoxidized Natural Rubber ◽  
Melt Mixing ◽  
Dynamic Mechanical ◽  
Thermoplastic Vulcanizates ◽  
Mixing Method ◽  
Internal Mixer

Epoxidized natural rubber (ENR)/Polypropylene (PP) thermoplastic vulcanizates were prepared by melt mixing method in an internal mixer. Influences of different mixing methods for incorporation of processing oil into the TPVs on tensile and dynamic mechanical properties of the TPVs and crystallinity of the PP were investigated. Results show that distribution of processing oil in the ENR/PP TPV is important due to the processing oil can promote and in the same time can interrupt an improvement in elastomeric properties of the TPV. Incorporation of processing oil into the ENR phase by preparation of oil extended ENR (the mixing method 1) before mixing with the PP was the better way to produce the TPV. It promoted the TPV with superior tensile and dynamic mechanical properties than the TPVs prepared from the mixing method 2 and 3 in which the processing oil was directly added into the PP phase. Furthermore, the TPV from the mixing method 1 had less effect of processing oil on the PP crystallization.

scholarly journals INFLUENCE OF FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBES ON FILTERABILITY AND MECHANICAL PROPERTIES OF RAYON NANOCOMPOSITE FILAMENTS

2016 ◽  
Vol 3 (01) ◽  
Author(s):  
Holia Onggo ◽  
Rike Yudianti ◽  
Endang Ruchiat
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Carbon Nanotube ◽  
Carbon Nanotube Dispersion ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Nanotube Dispersion ◽  
Scanning Electron

Carbon nanotube-rayon composite filaments was fabricated by spinning and coagulation of the mixture of 100mL functionalized carbon nanotube dispersion (containing 0.72 g FCNT) and cellulose xanthate in NaOH solution using viscose process. In the process, CNT was functionalized using mixture of acidic solution ( H2SO4/HNO3, 3:1 v/v). Influence of functionalized (FCNT) and non-functionalized carbon nanotubes (nFCNT) on the fabrication of rayon nanocomposite filament was studied. Physical and morphological properties of the nanocomposite filaments were characterized by single filament tenacity tester, photo micrograph, scanning electron microscope (SEM) and transmission electron microscope (TEM). Filterability and mechanical properties of FCNT-rayon nanocomposite filament greatly improved by reducing clogging constant from 1689 to 153 and increasing tenacity from 2.72 to 3.01 g/denier and decreasing elongation from 57.1 to 36.5% respectively compared with those of nFCNT-rayon nanocomposite filament.Keywords: functionalized multi-walled carbon nanotubes, nanocomposite filament, mechanical properties, filterability, dispersion  ABSTRAKRayon nanocomposite filaments telah dibuat melalui proses pemilinan (spinning) dan koagulasi (coagulation) dari campuran 100 mL larutan functionalized carbon nanotube dispersion (FCNT=0,72 g), selulosa santat dalam larutan NaOH melalui proses viskosa. CNT di functionalisasi (FCNT) menggunakan campuran larutan asam (H2SO4/HNO3, 3:1 v/v). Pengaruh fungsionalisasi CNT pada pembuatan rayon nanocomposite filaments dipelajari dengan cara membandingkannya dengan CNT tanpa fungsionalisasi (nFCNT). Sifat fisik dan morfologi dari rayon-nanocomposite filaments dikarakterisasi menggunakan tenacity tester, photo micrograph, scanning electron microscope (SEM) dan transmission electron microscope (TEM). Viskosa FCNT memiliki daya saring (Kw) cukup baik yaitu 155, sedangkan viskosa nFCNT  memiliki daya saring 1689 (tidak baik). Kekuatan mekanik dari FCNT-rayon nanocomposite filaments berturut turut adalah 3,01 g/denier (tenacity), dan 36,5% (elongation), lebih baik dibandingkan dengan nFCNT-rayon nanocomposite filament: 2,72 g/denier (tenacity) dan 57,1% (elongation).Kata kunci: fungsionalisasi multi-walled carbon nanotubes, rayon-nanocomposite filament, sifat mekanik, daya saring, dispersi

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