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RISS 인기검색어
- 검색키워드
- 저자 : Alagirusamy, R. (검색결과 4 건)
- 무료
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Dry Electrostatic Spray Coated Towpregs for Thermoplastic Composites
Vijay Goud,Ramasamy Alagirusamy,Apurba Das,Dinesh Kalyanasundaram 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Though the processing steps for the manufacture of thermoplastic composites present little difficulty when compared to those for thermoset composites, it is not cost effective as a result of difficulty in accomplishing thorough infusion of resin into fibers and fibrous structures. Tremendously high viscosity for thermoplastic resin leads to numerous problems in the manufacturing process of thermoplastic composites. Pre-impregnation processes such as melt impregnation or solution impregnation, tend to form a stiff towpreg that cannot be used for any textile preforming operation. Powder coating can be a destined to be a cost effective as well as efficient processing technology to produce a flexible towpreg. A method for production of flexible towpregs for thorough infusion of resin into fibers using electrostatic spray gun, which involves powder coating a bundle of filaments is described. During the powder coating process using electrostatic spray gun, powder particles fetched by a conveying air stream, from a fluidizing hopper, are charged in the high voltage corona discharge by ion bombardment and transported to the fiber tow through the combination of electrostatic, aerodynamic and gravitational forces. Aerodynamic forces have the obligation to carry the powder particles to the tow where electrostatic forces dominate and cause the adherence of powder particles to the potentially grounded tow. After the powder deposition, tow is made to pass through convective oven where powder particles glue to the reinforcement as a result of partial liquefaction of the powder. The towpreg formed is then wound by the take up device. Take up device is equipped with dancerarm which ensures constant line tension and thereby consistent powder deposition. The effects of process variables of the electrostatic spray process such as corona voltage, fluidizing air pressure, conveying air pressure, distance of gun from tow and tow velocity on maximum powder deposition are investigated and reported.
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Deopura, B.L.,Mattu, Ankush,Jain, Anurag,Alagirusamy, R. The Korean Fiber Society 2002 Fibers and polymers Vol.3 No.1
Polypropylene filaments were spun from a mixture of PP chips of two different Melt Flow Index (MFI) (3 MFI and 35 MFI). A significant difference was observed in the melting characteristics of the resultant filaments from either of the individual components as observed from the DSC. The main difference being in the degree of melting achieved at any temperature in the initial stages of the melting range, which was found to be higher in case of the filaments spun from the b]end. These filaments were then thermally bonded using silicon oil bath and heated roller method. Subsequently the bond strength of the filaments was measured on the Instron Tensile Tester using the loop technique. The values of the world strengths obtained from the blend were compared with those made from the individual component. It was found that the bond strength of the bonds obtained from the blended filament at a given temperature was higher than that of the bonds made from the filaments of either of the individual components, which is also suggested by the DSC curves. The difference in the bond strength was found to be as high as 25% in case of the blend with 60:40 composition ratios of the 3 MFI and 35 MFI components respectively.
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Mukhopadhyay, S.,Deopura, B.L.,Alagirusamy, R. The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.4
High Modulus and high tenacity polypropylene fibers have been prepared by drawing on a gradient heater. Results show that fiber properties are significantly affected by temperature profiles of final stage drawing on a gradient heater. The gradient drawn filaments showed superior mechanical properties when compared to filaments drawn over a constant temperature heater. Fibers with initial modulus of 16.4 GPa and tenacity of 670 MPa have been manufactured in the process. The nature of the gradient drawing had a significant effect on end properties. The superior mechanical properties are attributed to the high crystal perfection and crystallinity and low void fractions obtained at high draw ratios when drawn over a gradient heater.
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Rahul R. Gadkari,Ashutosh Gupta,Uddesh Teke,Atul Awadhiya,Mohammad Shahadat,Wazed Ali,Apurba Das,Ramasamy Alagirusamy 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
In this study, a novel eco-friendly chitosan-cinnamaldehyde cross-linked nanoparticles (CSN) weresynthesised via a green route and deposited, in alternating combination with sodium tripolyphosphate(TPP), over polyester (PET) nonwoven fabric using layer-by-layer (L-B-L) coating technique. Thesuccessful deposition of a nano-level coating (upto 684.7 nm) of 10.5 bi-layers of CSN and TPP, i.e. (CSN/TPP)10.5, with CSN at the top, was achieved at individualfibre surface as confirmed via scanning electronmicroscopy. Fabric coated with (CSN/TPP)10.5 showed remarkable antibacterial activity against both theGram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, even with a lowconcentration of the nanoparticles (0.1 w/v). Moreover, the coating material possesses very low toxicityas revealed by the cytotoxicity test. The developed fabric could also adsorb metal ions like Pb2+, Cu2+, Fe3+,Ni2+, Zr4+ and Cd2+, etc. from water. The coating was found to be stable in alkaline and neutral pHenvironments. The slight reduction in the pore dimensions, air permeability and tensile strength of fabricafter coating were insignificant with respect to its potential applications in developing health careproducts, medical and health care textiles and dry or wet purification media.
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