Ceria doped mullite reinforced polybenzoxazine nanocomposites with improved UV‐shielding and thermo‐mechanical properties

Abstract

In this present work, the UV shielding behavior of various mol percent of Ce doped mullite samples (CM0–5) were studied. The UV shielding behavior of mullite increasing with respect to ceria and reaching 78% of shielding tendency at 300 nm for CM5 was one of the fascinating outcomes of the study. Based on its exhibition of high shielding tendency, CM5 was chosen and functionalized with Glycidyl terminated silane. Subsequently, the resultant functionalized ceria doped mullite (FCM) was reinforced with polybenzoxazine (PBZ) matrix in order to build up FCM/PBZ nanocomposites. A detailed study was also conducted on the level of influence FCM yields in impacting properties such as UV shielding and thermo‐mechanical nature of FCM/PBZ nanocomposites. Upon analysis, it was determined that the 1.5 wt% FCM reinforced PBZ nanocomposite delivered 89% and 78% shielding efficiency at 300 and 200 nm UV region, respectively. Furthermore studies indicated that it exhibited 34% improved char yield, enhanced tensile strength, that is, 24.81% and 162°C as its glass transition temperature in comparison with neat PBZ matrix and other FCM/PBZ nanocomposites. These results suggest that the Ce doped mullite with high UV shielding properties can be used as a reinforcement to increase the UV shielding tendency of polymeric material which is of industrial significance. POLYM. COMPOS., 39:2073–2080, 2018. © 2016 Society of Plastics Engineers

Failure analysis of fiber-reinforced composites subjected to coupled thermo-mechanical loading

“…5) Increase the external loading and repeated the above steps until failure occurs [34,42]. During the calculations, the following equation of classic laminate theory is used along with the microscopic RVE model at each integration point, that is, 7) where N and M are the internal force and moment vectors, respectively. A and D are the inplane and bending stiffness matrices, respectively.…”

“…Studies on coupled thermo-mechanical responses of materials, which play an important role in structural health monitoring and optimal design of composites, have attracted great interests from both engineers and academic researchers [5][6][7]. Discussions on the effects of thermal stresses [8][9], thermal aging [10][11][12], sintering temperature [13] and thermal expansion [14] on the properties of composite materials have been reported by many investigators.…”

Bio-silicon reinforced siloxane core polyimide green nanocomposite with multifunctional behavior

“…In comparison with UV shielding metal oxides such as titania, ceria, zinc oxide, and so on, the resulting Si provides equivalent shielding effect. 10,11 In fact, in most of the metal oxides, due to their bandgap, UV light-induced photocatalytic reactions are initiated, resulting in the degradation of the polymeric structures. 7 In that context, our low-cost biomass-derived Si reinforcement definitely provides significant advantages and can be considered as an alternative choice for UV shielding applications.…”

“…), and metal (silver) were predominately reported as high dielectric reinforcements for polymeric nanocomposites. [6][7][8][9][10] These reinforcements improve electrical behavior but fail to protect the materials from UV radiation. In recent years, metal oxidesrelated nanocomposites such as ZnO, TiO 2 , CeO 2 , and so on were used to improve UV shielding tendency.…”

“…In recent years, metal oxidesrelated nanocomposites such as ZnO, TiO 2 , CeO 2 , and so on were used to improve UV shielding tendency. [10][11] However, such metal oxides have no impact in improving the dielectric properties of the polymer and are not so economical, limiting their wider application. Hence, the development of suitable reinforcement, which improves both electrical properties and UV shielding, is highly warranted.…”