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Khan S. Y. Allauddin U. Hasani S. M. F. Khan R. Arsalan M. 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12761-12778
Journal of Thermal Analysis and Calorimetry - The influence of tube curvature, conical valve geometry, and initial swirl on the thermal performance of vortex tubes is numerically investigated.... 相似文献
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Basit Shafiq M. Allauddin Usman Qaisrani Mumtaz A. Rehman Tauseef-ur- Ahmed Naveed Usman Mushtaq M. Ali Hafiz Muhammad 《Journal of Thermal Analysis and Calorimetry》2022,147(21):12127-12127
Journal of Thermal Analysis and Calorimetry - 相似文献
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Aswini K. Mishra Shaik Allauddin K. R. Radhika Ramanuj Narayan K. V. S. N. Raju 《先进技术聚合物》2011,22(6):882-890
The present study describes the effect of NCO/OH ratio and addition of Cerium (Ce)‐Zirconium (Zr) mixed oxide nanoparticles on the properties of Hyperbranched Polyurethane Urea (HBPUU) Coatings. Initially a hydroxyl terminated hyperbranched polymer (HTBP) was synthesized through A3 + CB2 approach. The HTBP and Ce‐Zr nanopowder dispersed HTBP, both were reacted with hexamethylene diisocyanate (HDI) separately; at various NCO/OH eq. ratios to get different NCO terminated HBPU and HBPU/Ce‐Zr hybrid prepolymers. These prepolymers were used for the preparation of HBPUU and HBPUU/Ce‐Zr hybrid coating films through moisture curing. The techniques such as 1H NMR, 13C NMR, FT‐IR, and XRD have been used for structural information while Dynamic mechanical and thermal analyzer (DMTA), Thermogravimetric analysis (TGA) and Universal testing machine (UTM) have been used for evaluation of thermo‐mechanical properties. The combined spectroscopic investigations results indicate the formation of HBPUU network with a degree of branching of 76% while FT‐IR deconvolution results indicates the formation of more hydrogen bonded structure with increasing NCO/OH ratio. The XRD and FT‐IR studies confirm the presence of Ce‐Zr mixed nanoparticles in the HBPUU hybrids. As per TGA and DMTA analysis the thermal stability, char residue, storage modulus (E', material stiffness) and glass transition temperature (Tg), increases with increasing NCO/OH ratio and Ce‐Zr nanoparticle loading in HBPUU coatings. In general, UTM data suggest that the tensile strength increases and per cent elongation at break decreases with increasing the NCO/OH ratio and addition level of nanoparticles in HBPUU coatings. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Basit Shafiq M. Allauddin Usman Qaisrani Mumtaz A. Rehman Tauseef-ur- Ahmed Naveed Usman Mushtaq M. Ali Hafiz Muhammad 《Journal of Thermal Analysis and Calorimetry》2022,147(21):12111-12126
Journal of Thermal Analysis and Calorimetry - Heat exchangers serve as pivotal components in industries. Enhancement in the performance of heat exchangers has been the focus of researchers in the... 相似文献
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