Article
Materials Science, Multidisciplinary
Vineeta Shukla, Sanjeev K. Srivastava
Summary: The study explores the utility of RGO/PdNi/EVA ternary nanocomposites in EMI shielding applications, finding that the shielding efficiency increases with filler content. The nanocomposites exhibit superior mechanical strength and thermal stability compared to the EVA matrix.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Yu Lei, Imane Boucenna, Veronique Thevenet, Diana Dragoe, Alain Ponton
Summary: In this study, PVA/GO composites were prepared using the freezing-thawing method, with investigations on their morphology, chemical structure, viscoelastic properties, and absorption of a cationic dye. The results showed that increasing the concentration of GO led to significant improvements in the properties of the composites, particularly in terms of absorption capacity. A correlation between absorption, swelling, and viscoelastic properties was proposed for the PVA/GO composites.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Composites
Gibin George, Arunjunairaj Mahendran, Selvakumar Murugesan, S. Anandhan
Summary: The study involved creating composites of EVACO and surface-modified MWCNTs using a solution casting technique, with acid treatment enhancing compatibility. The addition of minute quantities of m-MWCNTs significantly improved mechanical properties and thermal stability of the composites, but did not drastically alter electrical conductivity due to filler loading remaining below a threshold level.
POLYMER COMPOSITES
(2021)
Article
Polymer Science
J. D. Badia, R. Teruel-Juanes, Y. Echegoyen, S. Torres-Giner, J. M. Lagaron, A. Ribes-Greus
Summary: This study evaluated the impact of graphene nanoplatelets (GNPs) on the segmental motions of poly(ethylene-co-vinyl alcohol) (EVOH) using dielectric thermal analysis (DETA). Two relaxation zones were identified, with different relaxation behaviors observed at various temperatures. The addition of GNPs was found to increase the dynamic fragility parameters and dielectric permittivity of the nanocomposite fibers.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Biochemistry & Molecular Biology
Slawomir Wilczewski, Katarzyna Skorczewska, Jolanta Tomaszewska, Krzysztof Lewandowski, Waldemar Studzinski, Magdalena Osial, Piotr Jenczyk, Hubert Grzywacz, Agata Domanska
Summary: In this study, a method to improve the dispersion of graphene in rigid poly(vinyl chloride) matrix using a plant extract from Curcuma longa L. is proposed. The use of the proposed extract as a dispersant resulted in improved dispersion, mechanical properties, thermal stability, and glass transition temperature of the nanocomposites. This suggests that the extract can be a promising eco-friendly additive for the production of nanocomposites with enhanced homogeneity.
Article
Polymer Science
Rambabu Koyilapu, Suchismita Subhadarshini, Shuvra Singha, Tushar Jana
Summary: In this study, in-situ RAFT polymerization of poly(N-vinylimidazole) (PNVI) was successfully carried out in the intergalleries of Cloisite nanoclay to synthesize PNVI of different molecular weights. The PNVI modified clays were used to prepare nanocomposite membranes, with the results showing that the clay containing high molecular weight PNVI demonstrated the most effective enhancement of membrane properties.
Article
Materials Science, Composites
Mohammad Razavi-Nouri, Masoud Salavati
Summary: The influence of multi-walled carbon nanotubes (MWCNTs) on the thermal, mechanical, wetting properties, and rheological behavior of poly(ethylene-co-vinyl acetate) (EVA)/acrylonitrile-butadiene rubber nanocomposites was investigated. It was found that the addition of MWCNTs improved the solid surface free energy, work of adhesion, spreading coefficient, and Girifalco-Good's interaction parameter, while reducing the contact angle and interfacial free energy. The nanocomposite with 1 wt% nanofillers exhibited the highest tensile strength and toughness. Furthermore, the relaxation ratio and relaxation rate index decreased with increasing carbon nanotubes (CNTs) concentration. The increment in MWCNTs loading led to an increase in the yield stress of the molten materials according to a quadratic equation. The analysis also showed that the crystallization process was triggered at a slightly higher temperature with the introduction of CNTs, while the melting point and nucleation rate decreased noticeably with the increase in nanofillers content.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Composites
Mohammad Razavi-Nouri, Fatemeh Saeedi, Farshid Ziaee
Summary: Nanocomposites of PMMA and EVA with varying MWCNT content were prepared, with optimal mechanical properties achieved at 5 wt% MWCNT and significant increase in electrical conductivity at 2.5 wt% MWCNT. Rheological characterization showed an increase in normalized relaxation time up to 5 wt% nanofiller, followed by stability at higher MWCNT amounts.
POLYMER COMPOSITES
(2021)
Article
Engineering, Chemical
Iman Taraghi, Sandra Paszkiewicz, Izabela Irska, Anna Szymczyk, Amelia Linares, Tiberio A. Ezquerra, Magdalena Kurcz, Magdalena Winkowska-Struzik, Ludwika Lipinska, Krystian Kowiorski, Elzbieta Piesowicz
Summary: The study investigated the effect of GO and rGO on the properties of PVA, showing that the addition of GO can improve the thermal and mechanical properties of PVA, while decreasing the elongation at break. Additionally, all specimens exhibited insulating behavior, with only the sample containing a high amount of rGO showing electrical conductivity.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Polymer Science
Solmaz Massoudi, Massoumeh Bagheri, Younes Beygi Khosrowshahi, Maryam Hosseini
Summary: Two series of pH-sensitive poly (N-vinyl imidazole)/nitrogen-doped graphene quantum dots nanocomposite hydrogels (PVI/NGQD) were successfully synthesized via in situ polymerization method. The swelling behavior of the hydrogels was influenced by the crosslinker and NGQD content, and the incorporation of NGQDs increased the crystallinity and thermal stability of the nanocomposites. The nanocomposite hydrogels exhibited antibacterial activity and potential for biomedical applications.
Article
Materials Science, Composites
Tanuja Arya, Bhashkar Singh Bohra, Chetna Tewari, Sunil Dhali, Vishwesh Dikshit, Sravendra Rana, Yong Chae Jung, Nanda Gopal Sahoo
Summary: The present study describes an environmentally friendly and economically feasible method for synthesizing graphene oxide (GO) using agricultural waste, specifically oak fruit. The resulting agricultural waste-derived GO (AGO) is used as a reinforcing filler in the production of poly(vinyl alcohol) (PVA) polymer nanocomposites. The addition of AGO significantly improves the mechanical and thermal properties of PVA, making it a promising material for structural applications.
POLYMER COMPOSITES
(2023)
Article
Engineering, Chemical
Yifan Xia, Sinu C. Rajappan, Dmytro Serhiichuk, Mikkel Rykaer Kraglund, Jens Oluf Jensen, David Aili
Summary: A series of poly(vinyl alcohol-co-vinyl acetal) gel electrolytes were prepared and assessed for their performance as electrode separators in alkaline water electrolysis. The membrane properties could be tuned by varying the degree of functionalization, and a membrane with moderate vinyl acetal content showed good mechanical robustness and ion conductivity. The membrane effectively prevented hydrogen crossover during alkaline water electrolysis tests. The strategies presented in this work have general relevance to the field for the development of new ion-solvating membrane systems.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Environmental
Jiajia Xu, Huawei Qiao, Kai Yu, Mingfeng Chen, Canpei Liu, Walter Richtering, Huagui Zhang
Summary: In this study, smart foams stabilized by Cu2+ responsive microgels were presented as a proof-of-concept and demonstrated their potential for selective recovery of Cu2+ from competitive ions. The research laid foundations for the development of microgel-based flotation as a smart and green technology for Cu2+ recovery.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Mary Lizeth A. Anero, Arantxa Danielle S. Montallana, Magdaleno R. Vasquez
Summary: Smooth, continuous, bead-free zinc oxide (ZnO)-loaded electrospun poly(vinyl alcohol) (PVA) nanofibers were successfully fabricated by adjusting PVA concentration and adding ZnO powders. Various analyses confirmed the successful physical blending of ZnO in PVA, and the optical bandgap of the ZnO:PVA composite sheets was found to be suitable for photocatalytic applications.
RESULTS IN PHYSICS
(2021)
Article
Polymer Science
Beom-Gon Cho, Shalik Ram Joshi, Seongjin Lee, Shin-Kwan Kim, Young-Bin Park, Gun-Ho Kim
Summary: Functionalized graphene-polymer nanocomposites have been widely studied for their enhanced properties, but their current applications are limited by the multi-step processes or hazardous reducing agents required for functionalization. This study presents a single-step method for synthesizing thermally reduced graphene oxide (TrGO) using shellac, which shows promise for potential applications in biomedical devices. At a filler loading of 1.5%, the PVA-TrGO nanocomposite exhibited significantly improved mechanical and thermal properties, as well as enhanced antibacterial effectiveness compared to neat PVA.
