Infrared spectroscopy, mechanical analysis, dielectric properties and microwave response of pigskin gelatin films plasticized withglycerol

2013 ◽  
Vol 1 ◽  
pp. 10-15 ◽  
Author(s):  
P. Bergo ◽  
I.C.F. Moraes ◽  
P.J.A. Sobral
Keyword(s):  
Infrared Spectroscopy ◽  
Dielectric Properties ◽  
Mechanical Analysis ◽  
Microwave Response ◽  
Gelatin Films

Physical Properties of Gelatin Films Plasticized with Glycerol, Studied by Spectroscopic Methods

2010 ◽  
Vol 636-637 ◽  
pp. 753-758 ◽  
Author(s):  
P. Bergo ◽  
R.A. Carvalho ◽  
A.C.S. Vadala ◽  
V.C.I. Guevara ◽  
P.J.A. Sobral
Keyword(s):  
Infrared Spectroscopy ◽  
Physical Properties ◽  
Silica Gel ◽  
Edible Films ◽  
Polymeric Matrix ◽  
Glycerol Content ◽  
Flexible Films ◽  
Gelatin Films ◽  
Hydrophilic Nature ◽  
New Interactions

The effect of glycerol content on the physical properties of gelatin-based edible films was studied in this work, on the basis of the interactions between the plasticizer and polymeric matrix. In this work, some non-usual techniques were used to characterize edible films. For dielectric measurements and infrared spectroscopy, these films were conditioned in silica gel in order to minimize the water effect. For other analysis, the films were conditioned in NaBr. Infrared spectroscopy showed no apparent changes in the position peaks, suggesting an absence of new interactions between the plasticizer and film matrix. It seems that the plasticizers only occupy some specific regions between the polymeric matrix, increasing their distance, and thus, affecting their mobility, which results in more flexible films. Dielectric constant of the films increased with plasticizer content, and decreased over silica gel conditioning. The polarizability was found to arise mainly from water molecules present in the film. Microwave response was found to be also sensitive to water content in the films, due to plasticizer hydrophilic nature. According to the diffractograms, gelatin films presented essentially an amorphous nature, independently of the glycerol content. The results suggest, therefore, that the glycerol induces no chemical modifications in the films.

scholarly journals Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1321 ◽  
Author(s):  
Xiaohong Chi ◽  
Lu Cheng ◽  
Wenfeng Liu ◽  
Xiaohong Zhang ◽  
Shengtao Li
Keyword(s):  
Dielectric Properties ◽  
Space Charge ◽  
Power Transmission ◽  
Breakdown Strength ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Insulation Material ◽  
Nano Silica ◽  
Scanning Calorimetry ◽  
High Voltage Direct Current

Polypropylene (PP) contains promising application prospects in thermoplastic cables for high voltage direct current (HVDC) power transmission because of its outstanding thermal and dielectric properties. However, the problem of poor toughness and space charge has restricted the application of pure PP in HVDC cables. In this paper, polyolefin elastomer (POE) and nano-silica were blended thoroughly and added into a PP mixture by a melting method. Scanning electron microscopy (SEM) was employed to observe the dispersion of POE and nanoparticles. Thermal properties were characterized by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Mechanical properties were evaluated by tensile tests. The elastomeric properties of composites were improved as the dispersed POE could transfer and homogenize external mechanical forces. DC breakdown results showed that the fail strength of composite with 10 phr POE and 1 phr nano-silica was obviously enhanced. The pulsed electro-acoustic (PEA) results showed that the injection and accumulation of space charge was increased by the introduction of POE, while it was restrained by the collective effect caused by nano-silica filling. X-ray diffraction (XRD) spectrograms showed that secondary ordered structures existed in the composites of PP, POE, and nano-silica, and that the ordered structure around the nanoparticles contributed to the enhancement of breakdown strength. The mechanical and dielectric properties were modified synergistically, which made the modified PP a propitious insulation material for HVDC cables.

Mechanical and morphological characterization of basalt/Cissus quadrangularis hybrid fiber reinforced polylactic acid composites

2020 ◽  
Vol 234 (14) ◽  
pp. 2895-2907 ◽  
Author(s):  
A Arul Jeya Kumar ◽  
M Prakash
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Water Absorption ◽  
Dynamic Mechanical Analysis ◽  
Fourier Transform Infrared Spectroscopy ◽  
Polylactic Acid ◽  
Natural Fibers ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Cissus Quadrangularis

In today's scenario, most of the research works are carried out on the replacement of synthetic fibers using eco-friendly materials called natural fibers. Although there are many research findings in connection with natural fibers, in this work, a new combination of natural fiber having high biomedical potential is reinforced in the polymer composite. Three different weight fractions of polylactic acid, basalt, and Cissus quadrangularis fibers were melt mixed using twin-screw extruder named as PBCQ 1, PBCQ 2, and PBCQ 3. The mechanical, physical, and thermomechanical properties were studied by testing tensile, flexural, impact, hardness, water absorption, Fourier-transform infrared spectroscopy, and dynamic mechanical analysis of the injection-molded biomedical composite specimens prepared as per ASTM standards. It was noticed that the PBCQ 2 composite has the maximum elongation strength, bending strength, shear strength, and shore D hardness compared to other composites taken in this study. Water absorption of PBCQ 1 and PBCQ 2 composites are relatively less than PBCQ 3. The scanning electron microscopy micrograph of PBCQ composites shows tight bonding between the matrix and fibers. The adhesion of matrix and fibers was confirmed by Fourier-transform infrared spectroscopy graph, which indicates the stretching of molecular structure for the occurrence of O–H, C=O, and C–H links. The dynamic mechanical analysis curve of the PBCQ 2 composite indicates high storage modulus and less loss modulus compared to PBCQ 1 and PBCQ 3 due to the low weight percentage of basalt fiber in these composites.

Dielectric Properties of Dielectrophoretically Aligned ZnO-PDMS Composites

2016 ◽  
Author(s):  
Md Abdulla Al Masud ◽  
Zoubeida Ounaies
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Mechanical Analysis ◽  
High Yield ◽  
Chemical Route ◽  
Random Composites ◽  
Pdms Elastomer ◽  
Random Dispersion ◽  
Zno Rods

ZnO based polymer composite materials are of great interest because of their excellent electrical, optical, semiconductor and biocompatible properties. In this study, we synthesize anisotropic composites of aligned ZnO rods in polydimethylsiloxane (PDMS) elastomer and study their dielectric properties as a function of applied electric field and frequency. Submicron ZnO rods are synthesized using an inexpensive, high yield chemical route. Washed and purified ZnO rods are then aligned in uncured PDMS at different electric field and frequency. We find that under electric field, ZnO rotates with their long axis in the direction of the electric field and before coalescing form chains in the silicone elastomer. From the optical microscopy images and in situ dielectric measurements, the best alignment parameters are found at 4 kV/mm and 10 kHz. These conditions are then selected to prepare aligned ZnO-PDMS composites. Complete curing of composites is confirmed using dynamic mechanical analysis (DMA). Our results show that aligned ZnO in uncured PDMS exhibit higher dielectric permittivity compared to random dispersion with the same composition. For the cured ZnO-PDMS composites, dielectric permittivity increases by 80% compared to random composites.

scholarly journals Study of selected thermoplastics using dynamic mechanical analysis

2018 ◽  
Vol 157 ◽  
pp. 07002
Author(s):  
Marcel Kohutiar ◽  
Mariana Pajtášová ◽  
Róbert Janík ◽  
Iveta Papučová ◽  
Jana Pagáčová ◽  
...  
Keyword(s):  
Glass Transition ◽  
Infrared Spectroscopy ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Stress And Strain ◽  
Analysis Method ◽  
X Ray ◽  
Dynamic Mechanical

The aim of given paper is to study selected polymers using dynamic mechanical analysis method (DMA). DMA is one of the most useful techniques for the study of the viscoelastic behaviour of thermoplastic polymers. In relation to DMA, an oscillatory stress and strain is applied to the material at specific frequencies and temperatures and based on this mentioned fact hereinbefore, the resulting changes after the loading in the material are measured. This technique allows detecting the melting temperature and the glass transition temperature of the thermoplastic materials. Furthermore, some spectroscopy techniques, such as energy dispersive X-ray spectroscopy (EDX) and infrared spectroscopy (IR), were also used for the investigation of the thermoplastics. The thermoplastics used for examination, namely polyethylene, polystyrene, polypropylene and polyethylene terephthalate, were gained from the waste of the packaging.

Investigations of dielectric properties of wolframite A0.5Zr0.5NbO4 ceramics by bond theory and far-infrared spectroscopy

2020 ◽  
Vol 46 (3) ◽  
pp. 3688-3694 ◽  
Author(s):  
Hongyu Yang ◽  
Shuren Zhang ◽  
Yuanpeng Li ◽  
Hongcheng Yang ◽  
Ying Yuan ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Dielectric Properties ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Bond Theory
Sign in / Sign up

Export Citation Format

Share Document