Abstract
Blends of polybutylene terephthalate (PBT) and thermo tropic liquid crystalline polymer (LCP) and blend of PBT, LCP and nanosilica have been prepared by melt mixing technique. Polymer composites made by engineering thermoplastic PBT and reinforcing polymer LCP has been extruded in presence of nanosilica in different mixing sequence. Here the mixing sequence of PBT, LCP and nanosilica has been picked out so as to study the different changes that can be observed in the characteristics in each of the system. The resultant mixtures are then compression moulded in high temperature range. Microstructures of the blends have been studied by Field Emission Scanning Electron Microscope (FESEM). Thermal properties and dynamic behaviour of the composites have been analyzed by Thermo gravimetric Analysis (TGA) and Dynamic Mechanical Thermal Analyser (DMTA), respectively. From the TGA analysis it is evident that PNL has superior thermal stability than the other nanocomposites. FESEM analysis revealed that the nanosilica prefers the low viscous LCP phase than the high viscous PBT. PNL has the highest tensile modulus among all the nano composites due to migration of nanosilica from high viscous PBT to low viscous LCP phase. There is a remarkable enhancement in storage modulus value is observed in case of PNL system than the other nano composites.
Highlights
In the advent of rigid rod-like molecules and due to their spontaneous molecular orientation the thermo tropic liquid crystalline polymers (TLCPs) gains impressive rheological, thermal, and dynamic mechanical stability and thereby making them useful for a number of specialized application in conjunction with other thermoplastics
Blends of polybutylene terephthalate (PBT) and thermo tropic liquid crystalline polymer (LCP) and blend of PBT, LCP and nanosilica have been prepared by melt mixing technique.Polymer composites made by engineering thermoplastic PBT and reinforcing polymer LCP has been extruded in presence of nanosilica in different mixing sequence
The mixing sequence of PBT, LCP and nanosilica has been picked out so as to study the different changes that can be observed in the characteristics in each of the system.The resultant mixtures are compression moulded in high temperature range.Microstructures of the blends have been studied by Field Emission Scanning Electron Microscope (FESEM)
Summary
In the advent of rigid rod-like molecules and due to their spontaneous molecular orientation the thermo tropic liquid crystalline polymers (TLCPs) gains impressive rheological (low melt viscosity), thermal, and dynamic mechanical stability and thereby making them useful for a number of specialized application in conjunction with other thermoplastics. Some nanocomposite materials have been shown to be several times tougher and improved thermal and mechanical property than the bulk component materials (Ishida, Campbell, & Blackwell, 2000; Beecroft & Ober, 1997; Messersmith & Giannelis, 1995). To improve the processibility these thermoplastics are often blended with the polymer of lower viscosity like liquid crystalline polymer (LCP) and to minimize the phase separation in binary or multi component system, some compatibiliser is to be added during blending (Sahoo, Das, Pandey, & Mathur, 2002; Datta & Weiss, 1991; Jose, Thomas, Biju, Koshy, & Karger-Kocsis, 2008). The properties of LCP/polymer composites fall far short of expectations, mainly due to poor interfacial adhesion between the dispersed LCP phase and the thermoplastic matrix phase (Datta & Weiss, 1996). This paper mainly highlights about the migration of nanofillers to the low viscous medium (LCP) and for this how the thermomechanical, morphological propertiesare altered for different composite system
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