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Thermal degradation kinetics and modeling study of ultra high molecular weight polyethylene (Uhmwp)/graphene nanocomposite
, Article Molecules ; Volume 26, Issue 6 , 2021 ; 14203049 (ISSN) ; Shakiba, M ; Khosravi, F ; Ramakrishna, S ; Abasi, E ; Teo, Y. S ; Kalaee, M ; Abdouss, M ; Ahmad Ramazani, S. A ; Moradi, O ; Ghomi, E. R ; Sharif University of Technology
MDPI AG
2021
Abstract
The incorporation of nanofillers such as graphene into polymers has shown significant improvements in mechanical characteristics, thermal stability, and conductivity of resulting polymeric nanocomposites. To this aim, the influence of incorporation of graphene nanosheets into ultra-high molecular weight polyethylene (UHMWPE) on the thermal behavior and degradation kinetics of UHMWPE/graphene nanocomposites was investigated. Scanning electron microscopy (SEM) analysis revealed that graphene nanosheets were uniformly spread throughout the UHMWPE’s molecular chains. X-Ray Diffraction (XRD) data posited that the morphology of dispersed graphene sheets in UHMWPE was exfoliated. Non-isothermal...
Performance of glued-in rod timber joints under seawater and UV exposure cycles
, Article Construction and Building Materials ; Volume 322 , 2022 ; 09500618 (ISSN) ; Shakiba, M ; Yekrangnia, M ; Tannert, T ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Timber joints with glued-in rod connections provide an interesting technical solution for numerous structural applications, also under harsh environmental conditions; yet little research is available on this topic. This paper experimentally investigated the effect of exposure to seawater wetting/drying cycles and seawater wetting/drying plus UV radiation cycles on the pull-out performance of glued-in rod timber connections. Three rod diameters, three anchorage lengths, and four exposures were considered, leading to manufacturing and testing a total of 189 specimens. The quasi-static monotonic pull-out resistance of joints was a function of rod diameter and anchorage length as well as...