Article
Polymer Science
Jun Zhong, Xinyue Zhang, Xiaofeng Yu, Xuanyu Shi, Shihao Sun, Li Yang, Min Zuo, Yihu Song, Qiang Zheng
Summary: The selective distribution of silica nanoparticles grafted with crosslinked PMMA in PMMA/SAN blend was studied. Highly crosslinked PMMA chains mainly located in the PMMA-rich domains, while linear PMMA chains mainly located at the blend matrix interface. NPs grafted with slightly crosslinked chains were partially located at the interface and partially in the PMMA-rich domains. The deviation between theoretical prediction and actual location of modified NPs may be related to the heterogeneity of miniemulsion polymerization. The different locations of modified NPs induced by different grafted chain structures can result in various compatibilization effects on PMMA/SAN blend.
Article
Polymer Science
Fanghua Liu, Jinju Ahn, Junpei Miyake, Kenji Miyatake
Summary: Sulfonated poly(para-phenylene)s with high molecular weight and membrane-forming capability were obtained using methyl and trifluoromethyl substituents. Despite being more hydrophobic, SPP-BP-CF3 membranes exhibited higher water uptake and proton conductivity than SPP-BP-CH3 membranes with comparable ion exchange capacity.
Article
Polymer Science
Neel J. Shah, Sajjad Dadashi-Silab, Michael D. Galluzzo, Saheli Chakraborty, Whitney S. Loo, Krzysztof Matyjaszewski, Nitash P. Balsara
Summary: The study investigated the impact of salt addition on a diblock copolymer system with a negative Flory-Huggins interaction parameter, chi. It was found that ordered phases only appear under specific conditions, as predicted by ionic self-consistent field theory.
Article
Chemistry, Multidisciplinary
Glendimar Molero, Cong Liu, Zewen Zhu, Qihui Chen, Suzanne R. Peterson, Pavan Kolluru, Hung-Jue Sue, Shuntaro Uenuma, Koichi Mayumi, Kohzo Ito
Summary: The fracture behavior of polyrotaxane (PR)-modified poly(methyl methacrylate) (PMMA) was investigated. By adding only 1 wt % of PR to the PMMA matrix, substantial improvement in fracture toughness was achieved while maintaining modulus and transparency. The interaction between PR and PMMA contributes to higher molecular mobility and enhanced molecular cooperativity, leading to the formation of massive crazing and improved fracture toughness.
Article
Engineering, Chemical
Fatoumata Ide Seyni, Lawrence Barrett, Steven Crossley, Brian P. Grady
Summary: The use of carbon nanotubes with varying chemistry (diblock nanotubes) at the PS/PMMA interface can increase fracture toughness, while single-chemistry nanotubes do not have a reinforcing effect. However, the presence of agglomerates of carbon nanotubes may limit their effectiveness in toughening the interface.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Chemistry, Physical
Maria del Prado Garrido, Ana Maria Borreguero, Francisco Javier Redondo, David Padilla, Manuel Carmona, Maria Jesus Ramos, Juan Francisco Rodriguez
Summary: In this study, St-MMA particles with PEGMA and/or GMA brushes were synthesized and found to effectively remove bilirubin by improving the BSA immobilization capacity and reducing processing time. Attachment of BSA to the particles reduced bilirubin concentration in plasma from levels that threaten patient survival to levels close to those of healthy individuals.
Article
Chemistry, Multidisciplinary
Naharullah Jamaluddin, Yu- Hsu, Taka-Aki Asoh, Hiroshi Uyama
Summary: In this study, nanocomposites of PMMA and CNFp were successfully prepared using a solution casting technique. The experimental results showed that CNFp exhibited good compatibility and uniform dispersion in the PMMA matrix, indicating great potential for various applications.
Article
Materials Science, Multidisciplinary
Alireza Farazin, Alireza Shakeri, Hossein Mahdavi
Summary: In this study, an amphiphilic block copolymer suitable for modification of forward osmosis (FO) membrane support layers was synthesized using the ATRP method. The addition of this copolymer significantly improved the performance of the support layer, and the best performing membrane exhibited satisfactory FO performance.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Xiangning Wen, Yunlan Su, Guoming Liu, Shaofan Li, Alejandro J. Muller, Sanat K. Kumar, Dujin Wang
Summary: The correlation between the dispersion quality of PEG-grafted silica nanoparticles and the crystallization ability of PEO nanocomposites was systematically investigated, revealing that high sigma and low P/N conditions can increase the nucleation rate of PEO. This study highlights the importance of nanoparticle dispersion and grafting characteristics in influencing the crystallization behavior of polymer nanocomposites, leading to novel and unexpected results.
Article
Biochemistry & Molecular Biology
Aleksandra Wypych-Puszkarz, Onur Cetinkaya, Jiajun Yan, Ruslana Udovytska, Jaroslaw Jung, Jacek Jenczyk, Grzegorz Nowaczyk, Stefan Jurga, Jacek Ulanski, Krzysztof Matyjaszewski, Joanna Pietrasik, Marcin Kozanecki
Summary: Core-shell nanocomposites consisting of barium titanate nanocrystals grafted onto poly(methyl methacrylate) chains were prepared. The nanocomposites exhibited enhanced dielectric permittivity and improved thermal stability. The presence of ceramic nanoparticles affected the molecular dynamics and structure of the polymer chains.
Article
Materials Science, Multidisciplinary
Uday Shankar, Sushanta K. Sethi, Bhanu P. Singh, Ashok Kumar, Gaurav Manik, Anasuya Bandyopadhyay
Summary: Electrically conductive and optically transparent flexible nanocomposites made of polymers and multi-walled carbon nanotubes (MWCNT) are potential transparent substrates for optoelectronic applications. By studying the dispersion of MWCNTs in the matrix, it was found that the surface roughness increases with the amount of conductive filler, but remains below 10 nm. Additionally, the diffusion coefficient of the nanocomposite decreases with increasing load percentage of MWCNT.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Polymer Science
Thomas Kerr-Phillips, Mona Damavandi, Lisa Pilkington, Kathryn A. Whitehead, Jadranka Travas-Sejdic, David Barker
Summary: The conformation of a fluorescent polymer is crucial in determining its fluorescent properties. This study investigated the effect of grafted polymeric side chains on the photoluminescent properties of poly(para-phenylene vinylene) (PPV) and poly(para-phenylene ethynylene) (PPE). Ionic grafts were found to decrease the quantum yield, contrary to expectations, while uncharged side chain grafts significantly increased the quantum yield. These results highlight the importance of molecular conformation in the photoluminescent properties of fluorescent polymers.
Article
Polymer Science
Saori Nara, Hiroki Sagawa, Hiromu Saito, Hideko T. Oyama
Summary: In this study, super-tough PPS-based blends were achieved by melt blending PPS with EGMA and PPSU, showcasing the significant synergistic effects of interfacial reaction between PPS and EGMA and partial miscibility between PPS and PPSU on toughening mechanisms.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Helena Oliver-Ortega, Shiyu Geng, Francesc Xavier Espinach, Kristiina Oksman, Fabiola Vilaseca
Summary: The study focused on utilizing bacterial cellulose from kombucha tea fermentation as a reinforcing nanofiber network in PMMA matrix, leading to the creation of lightweight, porous nanocomposites with excellent mechanical properties. The nanofibrils in the KBC network had diameters ranging between 20-40 nm and exhibited high crystallinity (>90%). The prepared nanocomposites showed uniform structure, high stiffness, and were homogeneously impregnated with the PMMA matrix, demonstrating the potential of KBC as a template for polymer nanocomposites.
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
Chemistry, Applied
Fatemeh S. Miri, Morteza Ehsani, Hossein A. Khonakdar, Behjat Kavyani
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2020)
Article
Polymer Science
Mohammad Kazemi Ashtiani, Mojgan Zandi, Parvin Shokrollahi, Morteza Ehsani, Hossein Baharvand
POLYMERS FOR ADVANCED TECHNOLOGIES
(2020)
Article
Chemistry, Multidisciplinary
Abolfazl Salehi Moghaddam, Hossein Ali Khonakdar, Einollah Sarikhani, Seyed Hassan Jafari, Azizeh Javadi, Mohammad Shamsi, Mohammad Amir Amirkhani, Samad Ahadian
Article
Biochemistry & Molecular Biology
Reza Khalili, Payam Zarrintaj, Seyed Hassan Jafari, Henri Vahabi, Mohammad Reza Saeb
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2020)
Article
Materials Science, Coatings & Films
Salman Mirzadeh, Azadeh Asefnejad, Hossein Ali Khonakdar, Seyed Hassan Jafari
Summary: Superhydrophobic and antibacterial polyurethane nanocomposite films loaded with TiO2 and graphene nanoparticles were fabricated via a spray coating technique. The combination of TiO2, graphene, and nonsolvent led to a hierarchical structure with high uniform surface roughness, resulting in superhydrophobic/roll-off behavior and increased antibacterial activity to around 99%. The presence of TiO2 and graphene nanoparticles in the nonsolvent-induced phase separation (NIPS) process played a significant role in promoting the surface properties of the films.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Fatemeh Azadi, Seyed Hassan Jafari, Hossein Ali Khonakdar, Mohammad Arjmand, Udo Wagenknecht, Volker Altstaedt
Summary: The study showed that incorporating graphene oxide (GO) into poly(lactic acid)/thermoplastic polyurethane (PLA/TPU) blends significantly improved their shape memory performance by enhancing interfacial adhesion and strengthening mechanical properties.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Polymer Science
Hamid Reza Khalafi, Morteza Ehsani, Hossein Ali Khonakdar
Summary: The study found that cystamine as a curing agent for epoxy resin was well described by the Sestak-Berggren autocatalytic equation, with activation energies of about 56.2 and 53.6 kJ mol(-1), and a slightly lower glass transition temperature compared to other systems. Thermal degradation of the cured epoxy/cystamine network occurs above 283 degrees Celsius.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Maryam Aghili, Mohsen Khodadadi Yazdi, Zahra Ranjbar, Seyed Hassan Jafari
Summary: Functionalized graphene oxide/epoxy nanocomposite coatings prepared through cathodic electrophoretic deposition process exhibit excellent corrosion resistance properties, although aggregation of graphene oxide at higher loadings may adversely affect anti-corrosion performance.
Article
Biochemistry & Molecular Biology
Mohammad Hadi Salehi, Hooman Golbaten-Mofrad, Seyed Hassan Jafari, Vahabodin Goodarzi, Maliheh Entezari, Mehrdad Hashemi, Soheila Zamanlui
Summary: Bacterial cellulose aerogel was successfully used as a matrix for embedding nanomaterials and polymers to form conductive composite materials. The inclusion of nano-clay and polyaniline in the aerogel led to a significant improvement in electrical conductivity and thermal stability.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Roya Mashayekhi, Morteza Ehsani, Shervin Ahmadi, Ramin Khajavi, Hossein Ali Khonakdar
Summary: The effects of MNS on the thermal properties, morphology, and rheological behavior of PA6/SiO2 nanocomposites were investigated. It was found that MNS increased the crystallinity and arm number of the star-shaped structure, as well as enhanced thermal degradation and degradation temperature. The crossover point of storage modulus and loss modulus shifted in the multi-arms star-shaped samples. The multi-arms samples with maximum MNS loading showed lower shear viscosity and glass transition temperature than other samples.
IRANIAN POLYMER JOURNAL
(2022)
Article
Chemistry, Physical
Yanpei Fei, Ruitao Jiang, Wei Fang, Tong Liu, Mohammad Reza Saeb, Aleksander Hejna, Morteza Ehsani, Mateusz Barczewski, S. Mohammad Sajadi, Feng Chen, Tairong Kuang
Summary: In this study, thermoplastic polyurethane was synthesized on the aerogel skeleton to obtain cellulose/multiwalled carbon nanotubes/thermoplastic polyurethane nanocomposite foams. These foams showed lightweight, high strength, and high sensitivity properties, with good repeatability of force-to-electricity conversion behavior under 50% strain.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Materials Science, Composites
Ali Aghajani, Morteza Ehsani, Ramin Khajavi, Mohammadreza Kalaee, Davood Zaarei
Summary: This study prepared bio-epoxy composites containing boron nitride (BN) particles of different sizes and shapes, and found that these composites exhibited appropriate thermal conductivity, thermal stability, and mechanical properties. The combination of high-shear and ultrasonic techniques resulted in even dispersion of BN nanoparticles. The combination of platelet-like and tubular BN nanoparticles synergistically enhanced the thermal stability and thermal conductivity of epoxy. The bio-epoxy containing equal weight fractions of BN nanotubes and nanosheets showed the highest thermal conductivity and tensile strength values.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Ali Aghajani, Morteza Ehsani, Ramin Khajavi, Mohammadreza Kalaee, Davood Zaarei
Summary: Bio-epoxy composites with boron nitride (BN) and modified BN nano-scale filler were analyzed for their morphology, thermal properties, mechanical properties, thermomechanical properties, and conductivity. The results showed that the modified bio-epoxy composites exhibited increased thermal conductivity and mechanical stability.
IRANIAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Shahrzad Pashapour Yeganeh, Davood Zaarei, Morteza Ehsani, Mohammadreza Kalaee, Abdolrasul Oromiehie
Summary: For many years, Bisphenol A (BPA) based epoxy resins have been used as coating material for foodstuff cans because of their appropriate properties. Recently, with attention to the harmful health effects of BPA derivatives, limitation of the usage of epoxy resins has escalated. In this research, different nanocomposite coatings based on hybrid resinous materials containing different amounts of epoxy and polyester and silica nanoparticles were formulated using Taguchi experimental design method. The migration properties of formulated coatings were investigated based on the standard methods. The results showed that the 45 wt.% replacement of epoxy by polyester resin in combination with 2 wt. % of nano silica had no inverse effect on needed mechanical, physical and chemical properties of optimized formulation and, at the same time, migration of BPA and toxic materials were in the acceptable ranges, based on the EN1186-EU 10:2011 standard.
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
(2023)
Article
Materials Science, Composites
Mohammad Shadabfar, Morteza Ehsani, Hossein Ali Khonakdar, Majid Abdouss
Summary: This study successfully prepared a novel conducting polymer nanocomposite by chemically modifying carbon nanotubes and using carboxymethyl cellulose. The results showed improved dispersion and electrochemical properties for the nanocomposite containing oxidized carbon nanotubes.
POLYMER COMPOSITES
(2023)
