Article
Chemistry, Applied
Xueliang Xiao, Xiayan Huang, Ao Wang, Shaojie Cao, Mina Noroozi, Mahyar Panahi-Sarmad
Summary: In this study, a cellulose-based aerogel containing graphene oxide (GO), chemically-reduced-GO (CrGO), and thermally-reduced-GO (TrGO) was prepared to investigate its mechanical and electrical properties as well as meso-(nano)structure features. The effect of reduction processes on the cellulose/GO aerogel was studied using FT-IR spectroscopy and EDS analysis, confirming the accomplishment of the reduction processes. The formation of a porous structure in the aerogels was observed, and the meso-(nano)structure was characterized using Mercury-porosimetry and BET tests. The mechanical behavior of the aerogel improved with an increase in the C/O ratio. Low thermal and moderate electrical conductivity were measured for the reduced aerogels with the addition of different conductive fillers. A novel method was introduced to study the shape memory properties, and the thermally-reduced aerogel showed the best shape recovery rate in an aqueous solution with the simultaneous application of mechanical force and an electrical field (various voltages).
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Applied
Rauf Mahmudzade, Peyman Nikaeen, William Chirdon, Ahmed Khattab, Dilip Depan
Summary: Shape memory polymers have great potential in aviation and biomedical industries, but their full utilization is limited by the lack of understanding of their environmental degradation mechanisms. This study investigates the effects of UV-induced aging on the chemical structure, thermo-mechanical, morphological, and optical properties of an epoxy-based shape memory polymer, providing insights into the changes that occur during degradation.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Applied
Rauf Mahmudzade, Peyman Nikaeen, William Chirdon, Ahmed Khattab, Dilip Depan
Summary: UV exposure results in an increase in the number and dimension of microcracks on the surface of shape memory polymers, while also increasing the glass transition temperature of the polymer. After 600 hours of UV radiation, the elastic modulus and hardness of the polymer increased by approximately 22% and 33%, respectively.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Materials Science, Multidisciplinary
C. Thiyagu, U. NarendraKumar
Summary: This study developed a nanocomposite by combining graphene with polyurethane through melt mixing and solvent casting methods. The addition of graphene significantly improved the thermal stability and mechanical strength of the composite material.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Polymer Science
Tuhin Ghosh, Niranjan Karak
Summary: Smart polyurethane-polystyrene interpenetrating polymer network (IPN)-based nanocomposites were successfully fabricated with significant enhancements in mechanical and thermal properties upon incorporation of 1 weight% of f-RGO. The nanocomposites also exhibited outstanding chemical resistance and multi-functional behaviors like shape memory effect and artificial muscle-like behavior. These properties indicate the potential for advanced applications of the studied smart nanocomposites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Fei Wang, Wentao Wang, Cheng Zhang, Jiaoning Tang, Xierong Zeng, Xuejuan Wan
Summary: The study presents a novel approach to remote control and targeted activation of self-healing and shape-memory polymers through ingenious design, synthesis, and operation. Utilizing the photothermal conversion of carbon nanotubes (CNTs), the polymer demonstrates fast shape memory and self-healing abilities under near-infrared light, offering a new direction for the design of tunable mechanical properties in self-healing and shape memory nanocomposites.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Paper & Wood
Nazife Korkmaz Memis, Sibel Kaplan
Summary: Thermal and water responsive shape memory nanocomposite filaments were produced with excellent shape memory performance attributed to the thermal responsiveness of SMPU and water responsiveness from CNWs, displaying good mechanical and thermal properties suitable for smart textile applications.
Article
Materials Science, Composites
Changchun Wang, Lei Wang, Zewu Zhang, Na Zhang, Yu-an Huang
Summary: This paper investigates shape memory nanocomposite fibers (SMNFs) prepared by wet spinning, which exhibit thermo-active and water-driven shape memory effects. Carbon nanotubes (CNTs) are uniformly dispersed and aligned within the fibers, contributing to a significant increase in the recovery stress. The twisted SMNFs can rotate and lift objects in water, and the rotational velocity is temperature-sensitive. The SMNFs with high recovery stress show great potential for applications in actuators and artificial muscles.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Balasundaram Selvan Naveen, Nivya Theresa Jose, Pranav Krishnan, Subham Mohapatra, Vivek Pendharkar, Nicholas Yuan Han Koh, Woon Yong Lim, Wei Min Huang
Summary: This paper investigates the evolution of shore hardness in body-temperature programmable elastic shape memory hybrids (SMHs) upon cyclic loading and during the shape memory cycle. It is found that significant softening occurs upon cyclic loading, similar to the Mullins effect. After programming, the measured hardness generally increases with an increase in programming strain. However, in certain cases, the hardness decreases slightly and then rapidly increases, which can be explained by the formation of micro-gaps between the inclusion and the matrix after programming. Heating the samples melts the inclusions and largely recovers their original hardness.
Review
Polymer Science
Haresh Bhanushali, Shweta Amrutkar, Siddhesh Mestry, S. T. Mhaske
Summary: Shape memory polymers (SMPs) are important smart materials, but have limitations such as low tensile strength and recovery stress. Shape memory polymer nanocomposites (SMPNCs) are considered a way to overcome these limitations and enhance performance under thermal, electric, light, magnetic, and solvent stimuli.
Article
Materials Science, Biomaterials
Sanaz Sarabiyan Nejad, Donya Razzaghi, Mostafa Rezaei, Massuomeh Bagheri, Amin Babaie, Farhang Abbasi
Summary: Shape memory polyurethane (SMPU)/graphene quantum dot nanoparticles (GQDs) nanofibers prepared by electrospinning technique showed increased nanofiber diameter and mechanical strength due to the localization of GQD nanoparticles. The presence of GQDs also resulted in more uniform and straight nanofibers for PU-0.5%, while the crystallizable polycaprolactone (PCL) soft segment in PU induced shape memory potential. In vitro study demonstrated good interaction between PU-0.5% scaffold and 3T3 fibroblast cells.
INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Molahalli Vandana, Hundekal Devendrappa, Paola De Padova, Gurumurthy Hegde
Summary: The influence of hydrothermally synthesized electrochemically active graphene quantum dots on the photocurrent sensitivity of conjugated polymer has been studied. A high-performance ultraviolet photodetector was fabricated by depositing a polypyrrole-graphene quantum dots active layer on an ITO electrode, and its time-dependent photoresponse was examined. The photoresponse of the device may have potential applications in optoelectronic devices.
Article
Chemistry, Physical
P. Navaneethgowda, Yadav D. Bodke, B. Manjunatha, K. M. Mussuvir Pasha
Summary: The present work focuses on the synthesis of 3-[2-(1,3-benzothiazol-2-yl)hydrazinylidene]-1,3-dihydro-2H-indol-2-one derivatives and their structural characterization using various analytical techniques. The molecular electrostatic potential (MEP) and global parameters were studied using DFT analysis. Additionally, the solvatochromic UV-Vis absorption behavior and optical band gap of the derivatives were investigated. Furthermore, the cytotoxic activity of the compounds against MCF-7 and HepG2 cell lines was evaluated.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Polymer Science
Nour Halawani, RicardoK. Donato, Hynek Benes, Jiri Brus, Libor Kobera, Sebastien Pruvost, Jannick Duchet-Rumeau, Jean-Franois Gerard, Sebastien Livi
Summary: This study demonstrates the synergistic use of PEI and IL in epoxy networks, improving hydrophobic behavior and thermal stability while introducing shape memory behavior. The complex interphase generated by the thermoplastic-IL combination enhances the multifunctionality of the polymer blends.
Article
Chemistry, Physical
Min Zhang, Ruotong Zhu, Cheng Qian, Jingya Wang, Zhengzhou Jin, Yongxing Zhang, Weiwei Zhang, Qiangchun Liu
Summary: Researchers have long been working on high-performance microwave absorption materials with tunable electromagnetic properties. In this study, two-dimensional MoS2/reduced graphene oxide (MS/RGO) hybrids were constructed through a self-assembled hydrothermal method, showing optimized dielectric behaviors and superior microwave absorption properties with only 20 wt% filler-loading ratio. The composites exhibited wide effective absorption bandwidths, and the improved performance can be attributed to strong interfacial polarization loss, defect dipole polarization, conduction loss, and multiple reflections and scattering. The lightweight MS/RGO composite is considered a promising candidate for high-performance microwave absorbers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
