scholarly journals Use of Dynamic Mechanical Analysis (DMA) for Characterizing Interfacial Interactions in Filled Polymers

Solids ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 108-120
Author(s):  
Muhammad Ahsan Bashir
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Viscoelastic Behavior ◽  
Mechanical Analysis ◽  
Organic Coatings ◽  
Interfacial Interactions ◽  
Filled Polymers ◽  
Dynamic Mechanical ◽  
And Performance ◽  
Tan Δ ◽  
Peak Value

Dynamic mechanical analysis (DMA) provides reliable information about the viscoelastic behavior of neat and filled polymers. The properties of filled polymers are relevant to different industries as protective organic coatings, composites etc. Interfacial interactions in filled polymers play an important role in determining their bulk properties and performance during service life. In this brief review article, studies that used DMA to characterize the interfacial interactions in filled polymers have been reviewed. The available open literature provides a mixed opinion about the influence of interfacial interactions on the glass transition temperature of filled polymers. Nevertheless, it appears that in the case of strong interfacial interactions between the filler particles and the polymeric matrix, the peak value of tan δ is reduced in comparison to that of a filled polymer where these interactions are weak.

Application of dynamic mechanical analysis techniques to bismuth telluride based thermoelectric materials

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Witold Brostow ◽  
Kevin P. Menard ◽  
John B. White
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Bismuth Telluride ◽  
Polymeric Materials ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Thermal Transitions ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Tan Δ ◽  
Te Material

Abstract Dynamic mechanical analysis (DMA) techniques are commonly applied to characterize polymer-based materials - but little if at all to characterize semiconductor thermoelectric (TE) materials. TE materials may be coupled with polymeric materials in advanced thermoelectric devices, and the knowledge of TE material properties will be useful in the choice of materials for future applications. We have obtained DMA results for both n-type and p-type bismuth telluride based TE materials. We find that tan δ values, indicative of viscoelastic energy dissipation modes, approach the values for glassy or semi-crystalline polymers, and are larger by more than a whole order of magnitude than the tan δ of structural metals. DMA thermal scans show clear hysteresis-type effects and a correlation with differential scanning calorimetry thermal transitions. DMA properties as a function of frequency are briefly discussed. Our results show that DMA techniques are useful in the evaluation of thermophysical and thermomechanical properties of these TE materials and of assembled coolers. The viscoelastic effects we report may provide a damping mechanism for severe stresses inherent to service conditions of the TE coolers.

Dynamic Mechanical Analysis of Synthetic epoxy (E) and Bio-epoxy Polymer Foam Integrated with Wood Filler Under 8000 hours Exposure to UV Irradiation

2020 ◽  
Vol 01 (01) ◽  
Author(s):  
A. Alzomor ◽  
◽  
A. Z. M. Rus ◽  
H. A. Wahab ◽  
N. S. M. Salim ◽  
...  
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Uv Irradiation ◽  
Epoxy Polymer ◽  
Mechanical Analysis ◽  
Filler Material ◽  
Polymer Foam ◽  
Dynamic Mechanical ◽  
Pu Foam ◽  
Powder Filler ◽  
Tan Δ

The most common sustainable polymer for polyurethane (PU) materials is the production of polyurethane (PU) materials using renewable resources, which will reduce thedependency on petroleum-based products for consumption.This research presents findings from an experimental research on dynamic mechanical and viscoelastic properties such as storage module (E'), loss module(E") and damping coefficient(tan δ)of synthetic epoxy (E) and bio-epoxy (B) polymer foam with different loading ratios of 0%, 5%, 10%, 15% and 20% flakes and powder filler.The samples were then exposed to 8000 hours of UV irradiation. The samples were subjected to dynamic mechanical analysis (DMA) over a temperature range of 25-180 ° C for (E) and (B) polymer foam at a frequency of 1 Hz.The results showed that the 20 %synthetic epoxy with flakes filler material, namely as E20L sample with the highest filler ratio, gives the maximum storage module and loss module values (0.3125 MPa and0.0625 MPa respectively), among other filler ratios due to bonding between foam and filler resulting in increased viscosity of the synthetic-epoxy PU foam. The bio-epoxy PU foam with a 5% powder filler material (B5P), has the highest storage value (3,956 MPa) and loss module (17,213 MPa), showing that bio-epoxy PU foams can dissipate energy faster than synthetic-epoxy polymer foams.Thermogravimetric analysis (TGA) showed that the synthetic epoxy (E) polymer foam had a higher Tg value and the highest value was reported by E5L (1.2) compared to bio-epoxy foams with far less repeatable results due to the less homogeneous polyol structure.

scholarly journals An FFT-solver used for virtual Dynamic Mechanical Analysis experiments: Application on a glassy/amorphous system and on a particulate composite

2021 ◽  
Author(s):  
Stéphane André ◽  
Julien Boisse ◽  
Camille Noûs
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Composite Structures ◽  
Viscoelastic Behavior ◽  
Particulate Composite ◽  
Mechanical Analysis ◽  
Point Of View ◽  
Small Scale ◽  
Experimental Point ◽  
Dynamic Mechanical ◽  
Voxel Grid

International audience FFT-based solvers are increasingly used by many researcher groups interested in modelling the mechanical behavior associated to a heterogeneous microstructure. A development is reported here that concerns the viscoelastic behavior of composite structures generally studied experimentally through Dynamic Mechanical Analysis (DMA). A parallelized computation code developed under complex-valued quantities provides virtual DMA experiments directly in the frequency domain on a heterogenous system described by a voxel grid of mechanical properties. The achieved precision and computation times are very good. An effort has been made to show the application of such virtual DMA tool starting from two examples found in the literature: the modelling of glassy/amorphous systems at a small scale and the modelling of experimental data obtained in temperature sweeping mode by DMA on a particulate composite made of glass beads and a polystyrene matrix, at a larger scale. Both examples show how virtual DMA can contribute to question, analyze, understand relaxation phenomena either on the theoretical or experimental point of view.

Effects of Palm Waste Filled Thermoplastic Composites on Dynamic Mechanical Analysis

2018 ◽  
Vol 280 ◽  
pp. 422-430
Author(s):  
M.S. Zakaria ◽  
Che Mohd Ruzaidi Ghazali ◽  
Kamarudin Hussin ◽  
Mohd Kahar A. Wahab ◽  
K.A. Abdul Halim ◽  
...  
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Loss Modulus ◽  
Mechanical Analysis ◽  
Filler Loading ◽  
Thermoplastic Composites ◽  
Dynamic Mechanical ◽  
Twin Screw ◽  
Fine Size ◽  
Tan Δ ◽  
Palm Waste

The effects of palm waste (palm slag and palm ash) filled thermoplastic (high density polyethylene (HDPE) and recycled HDPE (rHDPE)) composites on dynamic mechanical analysis were examined. Two different particle size (150 μm – 300 μm) as coarse size and (≤ 75 μm) as fine size were used in this study. The palm waste of HDPE and rHDPE with 8 different types of sample were prepared using a twin screw extruder. 10 % of filler loading was chosen to produce the composite. The DMA result indicated that the fine size palm ash and coarse size palm slag have highest storage modulus incorporated with rHDPE composite meanwhile the effect of palm slag incorporated with HDPE also shown the similar findings as palm ash incorporated with HDPE. The loss modulus indicated that the coarse size of palm slag shows the lowest value and virgin HDPE gained the highest value after 90 °C in HDPE composite meanwhile fine size of palm ash and coarse size of palm slag both indicates the highest value when incorporated with rHDPE composite. For tan δ there are no significant differences recorded between the palm waste filled HDPE composite where virgin HDPE show the highest value. Meanwhile coarse size palm slag composite recorded the nearly identical tan δ value of rHDPE as the highest filled rHDPE composite. Conclusively, fine size palm ash and coarse size palm slag show the better viscoelastic properties in rHDPE composite.

Dynamic Mechanical Analysis of Polyurethane-Epoxy Interpenetrating Polymer Networks

2009 ◽  
Vol 21 (5) ◽  
pp. 608-623 ◽  
Author(s):  
Mariana Cristea ◽  
Sorin Ibanescu ◽  
Constantin N. Cascaval ◽  
Dan Rosu
Keyword(s):  
Activation Energy ◽  
Molecular Dynamics ◽  
Dynamic Mechanical Analysis ◽  
Loss Factor ◽  
Loss Modulus ◽  
Polymer Networks ◽  
Mechanical Analysis ◽  
Interpenetrating Polymer Networks ◽  
Dynamic Mechanical ◽  
Tan Δ

A series of semi-interpenetrated polymer networks based on bisphenol A epoxy resin and polyurethane was synthesized by sequential procedure. The molecular dynamics of polyurethane incorporated in the resin network with increasing amounts of resin was followed by dynamic mechanical analysis. All phenomena that concur in the material are evaluated by cross-examination of the storage modulus ( E'), loss modulus ( E'') and loss factor (tan δ) variation with temperature. Complex aspects were elucidated in consecutive heating-cooling-heating cycles and by calculating the apparent activation energy of relaxations in multiplex experiments.

scholarly journals Probing Dynamic Mechanical Analysis and Atomic Force Microscopy of Polypropylene/Kaolin Nanocomposite

2018 ◽  
Vol 7 (4.30) ◽  
pp. 465
Author(s):  
Dagaci Muhammad Zago ◽  
Suzi Salwah Binti Jika ◽  
Nur Azam Bin Badarulzaman ◽  
Nurun Najwa Binti Ruslan ◽  
Awwal Hussain Nuhu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Damping Factor ◽  
Force Microscopy ◽  
Dynamic Mechanical ◽  
Atomic Force ◽  
Roll Mill ◽  
Moulding Machine ◽  
Tan Δ

The Dynamic mechanical analysis (DMA) and Atomic force microscopy (AFM) studies were conducted and evaluated on polypropylene/kaolin (P/K) nanocomposite treated with maleic anhydride (MA) and dicumyl peroxide (DCP) as additives in an in- situ process.  Two-roll mill was used in compounding of the nanocomposites while moulding were done by injection moulding machine. Investigation in to the effect of K and MA/DCP on the nanocomposites (NCs) indicates that interfacial interactions between PP and K as filler was eminent. DMA analysis reveals an increase in the storage modulus which was at maximum significantly in P/K NC with 3 wt% and decrease in damping factor tan δ also at P/K NC of 3 wt%. The AFM study indicates that there was uniform and smooth surface roughness among the NCs. Thus, addition of MA/DCP on to P/K NC improves the reinforcing influence on the nanocomposites for better improvement.

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