Vishal Mathur

Morphology, miscibility and mechanical properties of PMMA/PC blends

This study deals with some results on morphology, miscibility and mechanical properties for polymethyl methacrylate/polycarbonate (PMMA/PC) polymer blends prepared by solution casting method at different concentration between 0 and 100 wt%. Dynamic storage modulus and tan δ were measured in a temperature range from 30 to 180°C using dynamical mechanical analyzer (DMA). The value of the storage modulus was found to increase with the addition of the PC in the matrix. Transition temperature of pure PMMA and pure PC is found to be 83.8 and 150°C, respectively. The result shows that the two polymers are miscible for whole concentration of PC in PMMA. The distribution of the phases in the blends was studied through scanning electron microscopy (SEM). Also the mechanical properties like elongation at break and fracture energy of the PMMA/PC blends increase with the increase in concentration of PC in PMMA.

Morphological effects on mechanical properties of polystyrene-polyvinylchloride blends

The morphological effects on mechanical properties of polystyrene/polyvinylchloride (PS/PVC) polymer blends were investigated through dynamic mechanical analyzer. Study reveals that the peaks of Tan δ curves of pure PVC and pure PS samples fall at temperatures 58.9 ± 0.2°C and 113.1 ± 0.1°C, respectively. Tan δ curves of 30, 50 and 70-wt% of PVC blends show two peaks indicating the immiscibility of PS/PVC blend. It has been observed that peak falling at lower temperature side shifts towards the higher temperature with the increase of PS concentration and the other one which falls at higher temperature side shifts towards lower temperature side with the increase of PVC concentration in PS/PVC blends. The variation in mechanical performance is attributed to the polymer domain interactions resulting from the different morphologies of various blend compositions.

Effect of nano CdS dispersion on thermal conductivity of PS/PVC and PS/PMMA polymeric blend nanocomposites

The effect of dispersion of CdS nano-filler particles in respective PS/PVC and PS/PMMA polymer blend matrices on the effective thermal conductivity has been studied through Hot Disk Thermal Constant Analyzer based on transient plane source (TPS) technique. The thick film samples have been prepared by dispersing nano-filler particles of CdS (6 wt%) in respective PS/PVC and PS/PMMA binary blend matrices. The nanocomposite nature of prepared samples ascertained through small angle X-ray scattering (SAXS) as well as transmission electron microscopy (TEM) measurements. It is observed that at room temperature nano CdS dispersed polymeric blend samples offer higher effective thermal conductivity.

Phase Transition and Mechanical Properties of PS/PVC/CdS Polymeric Nanocomposites

The present study reports the phase transition temperature and mechanical properties of CdS dispersed PS‐PVC nanocomposite through Dynamic Mechanical Analyzer (DMA). Thick films of polymeric nanocomposites have been synthesized by dispersing nano‐filler particles of CdS in PS/PVC binary blend matrix. The surface morphology of PS/PVC blend samples has been characterized by Scanning Electron Microscopy (SEM) while the nanostructure of the CdS filler in PS/PVC/CdS composite has been ascertained through small angle X‐ray Diffraction (XRD) technique. The phase transition temperature study of PS/PVC polymeric blends reveals that glass transition temperature, Tg, of the PS phase shifts towards lower temperature with the increase in PVC content in the blend whereas for CdS embedded polymeric phases of blends i.e. for PS/PVC/CdS samples, an increase in respective Tg values have been observed. This is suggestive to the fact that phase transition temperature and mechanical properties have been significantly influenc...

Thermo-mechanical performance of PVC/ZnO nanocomposites

ABSTRACT The present paper deals with the study of thermo-mechanical performance of PVC/ZnO nanocomposites. The samples have been prepared by solution casting technique with different (0, 2, 4, 6 and 8) wt. % of ZnO nanoparticles in poly (vinyl chloride) (PVC) matrix and structurally characterized through scanning electron microscopy. In thermo-mechanical analysis, dynamic mechanical analyzer gives the information about storage modulus and phase transition temperature (Tg). From these viscosities, profile at elevated temperature and activation energy of phase transition can be evaluated. This study reveals that dispersion of nano-ZnO significantly altered the thermo-mechanical properties of neat PVC but the effect is composition-dependent.

Structural, Morphological and Tensile Study of CdS/Polystyrene (PS) Nanocomposite

Thick film of CdS/Polystyrene (PS) nanocomposite was synthesized by dispersing nanofiller particles of CdS in PS matrix. The nanostructure of the CdS particles has been ascertained through X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). Small angle x-ray scattering analysis has been performed in order to ascertain nanocomposite character of the PS/CdS sample. Scanning Electron Microscopy (SEM) analyses of these samples have been carried out to establish the surface morphology. The Tensile studies of prepared samples have been ascertained through Dynamic Mechanical Analyzer (DMA). This study reveals that the young’s modulus and the toughness of the material are greatly influenced by the existence of interfacial energetic interaction between dispersed CdS nanofiller particles and matrix of PS.

Miscibility and Thermophysical Properties of Blend of Poly methyl methacrylate with Polyvinylchloride

The present paper reports the investigations on miscibility and thermophysical properties of blend of Poly methyl methacrylate with Polyvinylchloride, prepared by solution casting method. The miscibility of the samples is examined by dynamic mechanical analyzer (DMA) and the thermophysical properties (thermal conductivity (λ) and thermal diffusivity (χ)) have been measured using the transient plane source (TPS) technique from room temperature to 100 °C. The results of thermal transport properties of PMMA/PVC blend show an increasing trend of λ and χ upto Tg, beyond which they show a decreasing trend. The variation of thermal conductivity and diffusivity of PMMA, PVC and PMMA/PVC blend with temperature is explained on the basis of structural changes of the sample and mean free path of the phonons.