3th WCSET-2014 at Nepal

 

Mechanical Engineering / Sustainable Energy Session:

Title:            Experimental investigations on mechanical properties of Linear Low Density Poly ethylene - Fumed Silica nano composites
Authors:       Girish Chandran V., Sachin Waigaonkar, Vishal Ahuja
Abstract:      Nano Scale additives are currently gaining much interest in polymer reinforcements due to its ability of providing enhanced mechanical properties such as tensile strength, impact toughness, creep, stress relaxation, optical properties, electrical conductivity, gas and solvent transport and many other intrinsic and extrinsic properties with relatively low level of nano particle dispersion in polymer matrix. Linear Low density Polyethylene (LLDPE) is widely used for many outdoor engineering and domestic applications due to its high strength, impact resistance, environmental stress resistance and broader processing window. In this current research work the influence of FS nano particles, on the mechanical properties of LLDPE is investigated. LLDPE-FS nano-composite blends (1 – 8 wt % FS) were prepared by melt mixing and was compression moulded to prepare the samples for experimental investigation. The addition of the FS in low concentrations brought up an increase in the elastic modulus and the tensile strength of LLDPE accompanied by a significant increase in the elongation at break. A noticeable increment of flexural modulus, flexural strength and toughness was observed while the impact strength was found to decrease with the addition of FS in LLDPE. The increased mechanical properties on addition of FS are attributed to the suppression of spherulitic growth formation in LLDPE during melt mixing, creating well organized lamellar amorphous regions in the crystalline structure. The presence of FS in amorphous regions of LLDPE offers hindrance to molecular chain mobility and forms a three dimensional network structure resulting in the increased viscosity of polymer melt and reduced impact resistance in solid state.

Keywords:    LLDPE, Nano Composites, Fumed Silica, Mechanical Properties
Pages:          419-422

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