PREPARATION AND PROPERTIES OF A NOVEL EPOXIDIZED CASTOR OIL/CLAY NANOCOMPOSITES

2004 ◽  
Vol 03 (04n05) ◽  
pp. 663-669 ◽  
Author(s):  
S.-J. PARK ◽  
F.-L. JIN ◽  
J.-R. LEE
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Mechanical Analysis ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tearing Energy ◽  
And Storage ◽  
Epoxidized Castor Oil

A novel nanocomposites of modified clay in a glassy epoxy were prepared using a direct melt intercalation technique. The contents of oganoclay were varied with 0, 1, 2, and 3 wt% and N-benzylpyrazinium hexafluoroantimonate (BPH) was used for curing of epoxy matrix as a cationic latent catalyst. Dynamic mechanical analysis (DMA) measurement was performed to examine the glass transition temperature of the nanocomposites. As a result, X-ray diffraction indicated the intercalation of the epoxy chains happening inside the gallery of clay. The nanocomposites showed a higher glass transition temperature and storage modulus than those of the pristine epoxy. The mechanical interfacial properties of the nanocomposites were also investigated and the improvement in tearing energy of 160% over pristine epoxy was obtained.

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.

Study of the Glass Transition Temperature of (Se100-xBix)90Te10 (x = 0, 0.5, 1, 1.5, 2, 2.5, 3) Alloys

2011 ◽  
Vol 316-317 ◽  
pp. 55-58 ◽  
Author(s):  
Deepshikha Sharma ◽  
Saneel K. Thakur
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Heating Rate ◽  
Network Model ◽  
Differential Analysis ◽  
X Ray Diffraction ◽  
Glass Transition Temperatures ◽  
X Ray ◽  
Xrd Studies

Alloys of (Se100-xBix)90Te10 (x =0, 0.5, 1, 1.5, 2, 2.5, 3 at.%) were prepared by using a conventional melt-quench technique. The samples under investigation were characterized using X-ray diffraction (XRD) and differential analysis (DTA) at a heating rate of 10K/min. It was found, from the XRD studies, that the alloys were amorphous in nature. The glass transition temperatures of the alloys were found to increase with increasing bismuth content. This increase in the glass transition temperature was explained on the basis of a chemically ordered network model.

scholarly journals Measurement of the x-ray dose-dependent glass transition temperature of structured polymer films by x-ray diffraction

2007 ◽  
Vol 102 (1) ◽  
pp. 013528 ◽  
Author(s):  
Heilke R. Keymeulen ◽  
Ana Diaz ◽  
Harun H. Solak ◽  
Christian David ◽  
Franz Pfeiffer ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dose Dependent

Structure and Low Melting Property of Vanadate Tellurite Glass

2010 ◽  
Vol 663-665 ◽  
pp. 1229-1233 ◽  
Author(s):  
Shi Yong Luo ◽  
Wen Cai Xu ◽  
Xin Lin Zhang ◽  
Li Xia Huo
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Tellurite Glass ◽  
Melting Process ◽  
Glass Frit ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The glasses (80-x)TeO2·xV2O5·20MO (M=Sn, Bi, Ca, Na and K) had been examined as potential replacements for PbO-based glass frits with low firing temperature. The glasses with TeO2 0-44 mol%, and V2O5 39-82 mol% are not suitable for glass frit since they are easy to crystallize. The glasses with the content of the TeO2 54-74 mol%, and the V2O5 9-29 mol% were investigated by differential scanning calorimetry, X-ray diffraction, infrared spectra and fluidity evaluation experiments. The glasses possess appropriate fluidity and do not crystallize in the re-melting process at 723-753 K. The glass transition temperature of the glasses is at 544-578 K. The structure of the glasses is layer upon layer mainly connected by the structure units of [VO4] and [TeO3]. Other modifier ions locate mainly between the layers. The isolated V=O band from the VO5 bipyramids is not occurred in the vitreous structure of the glasses.

Effects of epoxidized natural rubber as a compatibilizer on latex compounded natural rubber-clay nanocomposites

2017 ◽  
Vol 37 (1) ◽  
pp. 43-51 ◽  
Author(s):  
Jing-Hua Tan ◽  
Xiao-Ping Wang ◽  
Yi-Wu Liu ◽  
Yuan-Fang Luo ◽  
De-Min Jia ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Mechanical Analysis ◽  
Epoxidized Natural Rubber ◽  
Rubber Matrix ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical Performances ◽  
And Storage ◽  
Latex Compounding

Abstract Natural rubber (NR)/montmorillonite (MMT) nanocomposites compatibilized with epoxidized natural rubber (ENR) were produced by latex compounding method. The effects of ENR as a compatibilizer on NR/MMT nanocomposites were investigated. The addition of ENR brought intercalation or exfoliation of the clay, which improved the clay dispersion in the rubber matrix, as characterized by X-ray diffraction (XRD) and transmission electronic microscopy (TEM). The interfacial interaction of ENR with MMT was investigated by Fourier transform infrared spectroscopy (FTIR). The vulcanization was hindered by the incorporation of ENR, while the mechanical performances, thermal stability and ageing resistance were improved. The glass transition temperature and storage modulus increased with ENR loading, which was corroborated by dynamic mechanical analysis (DMA).

Dynamic mechanical behaviour of kevlar and carbon-kevlar hybrid fibre reinforced polymer composites

2020 ◽  
pp. 095440622097060
Author(s):  
Pragati Priyanka ◽  
Harlal Singh Mali ◽  
Anurag Dixit
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Storage Modulus ◽  
Composite Laminates ◽  
Mechanical Analysis ◽  
Textile Composites ◽  
Elastic Behaviour ◽  
Dynamic Mechanical

Comprehensive experimental results of dynamic mechanical analysis (DMA) of polymer reinforced textile composites are presented in the current investigation. Plain and 2x2 twill woven multilayer fabrics of monolithic kevlar and hybrid carbon-kevlar (C-K) are reinforced into the thermoset polymer matrix. Kevlar/epoxy and C-K/epoxy composite laminates are fabricated using an in-house facility of the vacuum-assisted resin infusion process. Variation of the visco-elastic behaviour (storage modulus, damping factor and glass transition temperature, Tg) along with time, temperature and frequency is studied for the composites. Dynamic mechanical analysis is performed under temperature sweep with frequency ranging from 1-50 Hz. Results depict the effect of inter yarn hybridisation of carbon with kevlar yarns on the storage modulus, damping performance, and creep behaviour of dry textile composites. Temperature swept dynamic characterisation is also performed to evaluate the degradation and damping performance of the composite laminates soaked in the deionised water at glass transition temperature Tg, ½ Tg, and ¾ Tg. The morphological study has been performed post the dynamic mechanical analysis using field emission scanning electron microscope.

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