Irradiation of poly(vinyl ester)/clay nanocomposites

2017 ◽  
Vol 52 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Ahmad Mohaddespour ◽  
Seyed J Ahmadi ◽  
Hossein Abolghassemi ◽  
Seyed M Mahjoub ◽  
Saeid Atashrouz
Keyword(s):  
Vinyl Ester ◽  
In Situ Polymerization ◽  
Surface Hardness ◽  
Clay Nanocomposites ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Transition Electron Microscopy ◽  
Organically Modified ◽  
Polymerization Method

The effect of electron beam irradiation on pristine poly(vinyl ester) and cured poly(vinyl ester)/clay nanocomposite with different clay contents is studied at irradiation doses ranging from 100 to 1000 kGy at room temperature. Poly(vinyl ester)/clay nanocomposites were prepared with different amounts of organically modified montmorillonite (1, 3, and 5 wt.%) by in situ polymerization method. Morphology properties of synthesized nanocomposites were studied by X-ray diffraction and transition electron microscopy. The irradiation dose up to 500 kGy yields an increase in Young’s modulus and tensile strength of nanocomposites while further irradiation deteriorates the mechanical strength of samples. Irradiation has no considerable influence on the surface hardness of synthesized nanocomposites. Thermogravimetric analysis results reveal the thermal stability of poly(vinyl ester), and its nanocomposites is improved with irradiation up to 500 kGy. However, similar to mechanical perdition at 1000 kGy irradiation, thermal resistance of nanocomposites decreases. The enhancement in mechanical and thermal properties of synthesized nanocomposites is attributed to the cross-linking effect as bonds can be formed directly between the neighbouring chains.

scholarly journals Humidity Sensing Properties of Surface Modified Polyaniline Metal Oxide Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
S. C. Nagaraju ◽  
Aashis S. Roy ◽  
J. B. Prasanna Kumar ◽  
Koppalkar R. Anilkumar ◽  
G. Ramagopal
Keyword(s):  
In Situ Polymerization ◽  
High Sensitivity ◽  
Thermal Coefficient ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Praseodymium Oxide ◽  
Surface Modified ◽  
Oxide Composites ◽  
Polymerization Method

Polyaniline- (PANI) praseodymium Oxide (Pr2O3) composites have been synthesized by in situ polymerization method with different weight percentages. The synthesized composites have been characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The temperature dependent conductivity shows that the conductivity is due to the hopping of polarons and bipolarons. These composites show negative thermal coefficient (α) behavior as a function of temperature, which is characteristic behavior of semiconducting materials. Sensor studies have been carried out by two-probe method and found that the sensitivity increases with increase in % RH. It is noticed that stability increase is due to the presence of Pr2O3in polyaniline up to 30 wt%. A fast recovery and response time along with high sensitivity make these composites suitable for humidity sensors.

Preparation and Characterization of PET/MMT Nanocomposition Modified by MDI

2014 ◽  
Vol 904 ◽  
pp. 7-9
Author(s):  
Xiao Hua Gu ◽  
Xi Wei Zhang ◽  
Bao Yun Xu ◽  
Peng Zeng
Keyword(s):  
Thermal Stability ◽  
In Situ Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Organic Montmorillonite ◽  
Polymerization Method ◽  
Thermal Stability Of

In this paper, the diphenyl methane diisocyanate (MDI) was used to modify montmorillonoid (MMT) and got the organic montmorillonite (OMMT), which was used with the monomers of PET by in situ polymerization method to prepare PET/MMT nanocomposition. The OMMT was analyzed by the X ray diffraction (XRD) to test the change of the spacing layer. Dispersion of MMT in the PET/MMT nanocomposites were studied with XRD and SEM and by means of thermogravimetric analyzer (TGA) on the thermal stability of PET/MMT nanocomposites. The results showed that, MDI modified MMT successfully, and the compatibility of MMT and PET was increased .

Investigation of Magnetic Properties and Nanostructure of Fe2.75Mn0.25O4@ PANI Materials and their Potential as the Magnetic Ink

2020 ◽  
Vol 855 ◽  
pp. 308-314
Author(s):  
Nadiya Miftachul Chusna ◽  
Sunaryono ◽  
Yunan Amza Muhammad ◽  
Rosabiela Irfa Andin ◽  
Ahmad Taufiq
Keyword(s):  
Magnetic Properties ◽  
Crystal Size ◽  
In Situ Polymerization ◽  
Xrd Analysis ◽  
Hysteresis Curve ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Polymerization Method

The Fe2.75Mn0.25O4 nanoparticles were successfully synthesized by using the coprecipitation method, while the Fe2.75Mn0.25O4@PANI materials were successfully fabricated by using the in situ polymerization method. This research aimed to investigate the magnetic properties and nanostructure of the Fe2.75Mn0.25O4 nanoparticles and Fe2.75Mn0.25O4@PANI materials. Some characterizations of the samples were successfully carried out by using X-Ray Diffraction (XRD) instruments, Fourier Transform Infrared (FTIR), and Vibrating Sample Magnetometer (VSM) each of which was conducted to characterize the crystal structure, functional groups, morphology, and the magnetic properties of the materials. The XRD analysis results showed that the Fe2.75Mn0.25O4@PANI materials had a crystal size of 8.09 nm. Meanwhile, the FTIR spectrum represented vibrations due to the atomic bonds that made up the Fe2.75Mn0.25O4@PANI materials. Furthermore, the hysteresis curve from the VSM characterization results showed that the Fe2.75Mn0.25O4@PANI material saturation magnetization value was around 2.85 emus/g. From those characterization results, the Fe2.75Mn0.25O4@PANI materials are very potential to be applied as magnetic ink

Dual Carbon Coating Used in the Preparation of LiFePO4/C Cathode Material

2013 ◽  
Vol 724-725 ◽  
pp. 844-847
Author(s):  
Ying Jiang ◽  
Fu Xin Zhong ◽  
Zhong Yuan Cheng ◽  
Peng Fei Yu ◽  
Yun Xia Jin ◽  
...  
Keyword(s):  
Cathode Material ◽  
In Situ Polymerization ◽  
Carbon Sources ◽  
Cycle Performance ◽  
Electrochemical Performances ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Polymerization Method

The LiFePO4/C cathode material was synthesized by two–step addition of dual carbon sources method based on the in situ polymerization method combining with two–step sintering process. In this study, the structure and morphology have been studied systematically by X–ray diffraction (XRD) and scanning electron microscope (SEM).The electrochemical performances have been shown by the charge/discharge capacity, rate property, cycle performance. It was evidenced that the two–step addition of dual carbon sources had remarkable advantages, including the more complete coating carbon, and the improvement in the electrochemical performance of LiFePO4/C.

scholarly journals In-Situ Preparation of Conducting Polymers/Copper (II)-Maghnite Clay Nanocomposites

2017 ◽  
Vol 14 (2) ◽  
pp. 204-211 ◽  
Author(s):  
Fatima Zeggai ◽  
Mohammed Belbachir ◽  
Aicha Hachmaoui
Keyword(s):  
Conducting Polymers ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Preparation ◽  
Ft Ir ◽  
The Fourier Transform

In this work we report a simple way for the conducting polymer nanocomposites synthesis using on algerian hydrophilic natural Montmorillonite (MMT) nanoclay named Maghnite (Mag) as dopant. The electrochemical properties study of the following conducting polymers: poly(4-aminobenzylamine) (P4ABA) and polyaniline (PANI) nanocomposites with copper maghnite (Mag-Cu) were successfully prepared by In-Situ polymerization, in presence of inorganic nanolayers of clay, and oxidizing agent ammonium persulfate. The synthesis of copolymers was developed at different feed mole fractions of monomer. The products were characterized by the Fourier transform Infrared (FT-IR), the ultraviolet-visible (UV–vis) spectroscopies and X-ray diffraction (XRD). The results showed that the in-situ polymerization produced real nanocomposites containing aniline and 4-aminobenzylamine units.

scholarly journals Gas Sensor based on PANI/Cu-ZnS Porous Micropshere Film for CO2 detection

2020 ◽  
Author(s):  
Hemalatha Parangusan ◽  
Jolly Bhadra ◽  
Zubair Ahmad ◽  
Shoaib Mallick ◽  
Farid Touati ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Gas Sensing ◽  
In Situ Polymerization ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Co2 Gas ◽  
Transmission Electron ◽  
Co2 Detection ◽  
Polymerization Method

In this letter, we report the structural, morphological and CO2 gas sensing properties of the polyaniline (PANI) coated Cu-ZnS microspheres. PANI coated Cu-ZnS microspheres were prepared by hydrothermal and in-situ polymerization method. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to investigate the structural and morphological properties. The fabricated sensor based on PANI coated Cu-ZnS microspheres exhibits good CO2 sensing performance with rapid response (31 s) and recovery (23 s) times.

UV Curable Polymers with Organically Modified Clay as the Nanoreinforcements

2003 ◽  
Vol 788 ◽  
Author(s):  
Fawn M. Uhl ◽  
Brian R. Hinderliter ◽  
Siva Prashanth Davuluri ◽  
Stuart G. Croll ◽  
Shing-Chung Wong ◽  
...  
Keyword(s):  
Glass Transition ◽  
Uv Curing ◽  
Barrier Properties ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
Uv Curable ◽  
Organically Modified ◽  
Transition Barrier

ABSTRACTUV curable polymers are prevalent in microelectronic applications. Several advantages are associated with UV curing such as rapid cure, solvent free systems, application versatility, low energy requirements, and low temperature operation. To be used in electronics the films must posses the following attributes: high glass transition, barrier properties, low shrinkage, flexibility, and enhanced mechanical properties. The area of polymer-clay nanocomposites have been widely investigated by researchers and improved mechanical, thermal, and barrier properties were reported. Most researchers have attempted nanocomposite formation by melt mixing or in situ polymerization. Little is understood on UV curable nanocomposites. This paper seeks to examine nanoclay-containing polymers using organomodified montmorillonites in UV curable systems and the effects of such clay inclusions on the properties of UV cured films. By x-ray diffraction it appeared that intercalated structures were formed. In the case of an epoxy acrylate formulation an increase in glass transition temperature was observed for formulations containing clay.

MECHANICAL AND THERMAL PROPERTIES OF MONTMORILLONITE-EPOXY NANOCOMPOSITE

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3247-3253 ◽  
Author(s):  
B. T. MAROUF ◽  
R. BAGHERI ◽  
R. A. PEARSON
Keyword(s):  
Thermal Properties ◽  
In Situ Polymerization ◽  
Mechanical And Thermal Properties ◽  
Toughening Mechanism ◽  
X Ray Diffraction ◽  
X Ray ◽  
Epoxy Nanocomposite ◽  
Transmission Electron ◽  
Stiffening Effect

In this investigation, the mechanical and thermal properties of the montmorillonite-epoxy nanocomposites were studied. The epoxy compounds were prepared by in situ polymerization and the intercalation dispersion were obtained as evidenced using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results reveal remarkable stiffening effect and slight toughening effect of the MMT in the epoxy resin and an insight about the crack tip and notch tip toughening mechanism. According to the DMA, the glass transition temperature increases as increasing the MMT content.

Fabrication of bionanocomposites reinforced with hemp nanocellulose and evaluation of their mechanical, thermal and dynamic mechanical properties

2021 ◽  
pp. 146442072110046
Author(s):  
SS Rana ◽  
MK Gupta
Keyword(s):  
Mechanical Properties ◽  
In Situ Polymerization ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
X Ray Diffraction ◽  
Dynamic Mechanical ◽  
Hemp Fibres ◽  
Polymerization Method

The present study aims to fabricate the epoxy-based bionanocomposites reinforced with hemp nanocellulose and the evaluation of their mechanical, thermal and dynamic mechanical properties. Nanocellulose from hemp fibres was isolated via the chemo-mechanical method and its bionanocomposites were prepared using the in situ polymerization method. Although many researchers have reported studies on the preparation and characterization of bionanocomposites however, studies on the mechanical, thermal, and dynamic mechanical properties of epoxy-based bionanocomposites reinforced with hemp nanocellulose are still unreported. The mechanical properties (i.e. tensile, flexural, hardness, and impact) and dynamic mechanical properties (i.e. glass transition temperature, damping behaviour, storage, and loss modulus) of the developed bionanocomposites were investigated. Further, the crystalline behaviour and thermal stability were also studied using the X-ray diffraction and thermogravimetric analysis techniques, respectively. The results revealed that an addition of nanocellulose considerably improved the mechanical, thermal, and viscoelastic properties of the bionanocomposites. As much as 52.17%, 48.17%, 89.08%, and 15.67% improvements in the tensile strength, flexural strength, impact strength, and hardness, respectively, for the 2 wt.% nanocellulose composites were found over the epoxy matrix.

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