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Bhaskar J.,Uttar Pradesh Technical University | Haq S.,Uttar Pradesh Technical University | Yadaw S.B.,Defence Material and Stores Research and Development Establishment
Journal of Thermoplastic Composite Materials | Year: 2012

The wood plastic composites (WPCs) are made using matrices of recycled polypropylene with sawdust (pine wood flour) as filler. Corresponding WPCs are also made using virgin plastics (vPP, virgin polypropylene) for comparison with the recycled plastic-based composites. All varieties of these WPCs are made through melt compounding and injection molding with varying formulations based on the plastic type (PP, polypropylene), plastic form (recycled and virgin), wood flour content, and addition of maleated polypropylene-coupling agent. The melt flow index and mechanical properties of WPCs are investigated. The results clearly show that recycled PP (rPP) can be successfully used to produce stable and strong WPCs. Properties and performances of WPC made of rPP are comparable to WPC made of wood and vPP. Therefore, WPCs based on both rPP and vPP matrices have potential to be used as construction materials with wood flour. © The Author(s) 2011 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav. Source


Kumar S.,Defence Material and Stores Research and Development Establishment | Misra M.K.,Defence Material and Stores Research and Development Establishment | Mondal S.,Advanced Systems Laboratory | Gupta R.K.,Defence Material and Stores Research and Development Establishment | And 3 more authors.
Ceramics International | Year: 2015

Uni-directional C/SiC composites were fabricated by thermal molding of carbon fiber tows with the in-house synthesized polycarbosilane. The molding was carried out at 300. °C followed by pyrolysis at two different temperatures viz. 1400 and 1600. °C. The composite specimens were densified by repeated vacuum infiltration of the polycarbosilane at 170. °C and pyrolysis at the pre-decided temperatures to achieve density up to 1.8-1.85. g/cc. Flexural and tensile strength of the composites pyrolysed at 1600. °C were found to be 700. MPa and 275. MPa while the properties of the composites pyrolysed at 1400. °C were about 20% lower than these values. Micro-structure revealed that the in-situ growth of SiC nano-pins at 1600. °C, play an important role to enhance the mechanical properties. Growth mechanism of the SiC nano-pins has also been proposed. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Abraham A.A.,Defence Material and Stores Research and Development Establishment | Chauhan R.,Defence Material and Stores Research and Development Establishment | Srivastava A.K.,Defence Material and Stores Research and Development Establishment | Katiyar M.,Defence Material and Stores Research and Development Establishment | Tripathi D.N.,Defence Material and Stores Research and Development Establishment
Journal of Polymer Materials | Year: 2011

Epoxy foams were made at ambient conditions, by simultaneous crosslinking and foaming, using an amine-amide adduct as curing agent and polymethyl hydrosiloxane as blowing agent which can result in the evolution of hydrogen gas by reacting with the curing agent. The foam composition consisted of a combination of aromatic and aliphatic epoxy resins, foam stabilizer and nucleating agent to control the foam properties. Foams of different densities (0.15, 0.25, 0.35 and 0.45 g/cm3), were prepared by varying the weight percentage of blowing agent in the compositions. Microstructure of the foams were studied using scanning election microscopy (SEM). The effect of microstructure of the foams on the mechanical, thermal and dielectrical properties was then studied using different methods like compression test, dynamic mechanical analysis (DMA), thermal mechanical analysis (TMA) etc. The properties of the foam were observed to be strongly dependent on the microstructure of the foams. © MD Publications Pvt. Ltd. Source

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