Article
Chemistry, Physical
Jotypriya Sarkar, Mithun Madhusudanan, V. C. Chandni, Shilpa Choyal, Mithun Chowdhury
Summary: Poly-(n-butyl methacrylate) (PnBMA) is an important polymer in biomedical applications. This study investigates the stability of PnBMA thin films on silicon substrates immersed in nonsolvent aqueous incubation media, such as water and phosphate-buffered saline (PBS), at biologically relevant temperatures. Dewetting hole growth experiments indicate that the stability of PnBMA films decreases with the duration and temperature of incubation, and water incubation leads to greater instability than PBS incubation. The observations are explained by the increase in surface energy, the dominant polar interactions, and the plasticization effect of the incubation media on the PnBMA films.
Article
Chemistry, Physical
Valtteri Lasonen, Anton Vihervaara, Georgi Popov, Eva Tois, Lars Mester, Mohammad Karimi, Yoana Ilarionova, Reza Jafari Jam, Jonas Sundqvist, Mikko Ritala
Summary: Area-selective etching (ASE) of polymers is a novel and simple self-aligned patterning technique with potential application in semiconductor device fabrication. The polymer film is selectively decomposed on top of catalytically active materials while staying intact on catalytically inactive materials, eliminating edge placement errors and defects. This study investigates the ASE of poly(methyl methacrylate) (PMMA) using various catalytic materials in different atmospheres. The feasibility of the entire patterning process is demonstrated on a 100 nanometer scale.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Qingxiang Wu, Zunpeng Feng, Ziming Cai, Chuwen Lan, Jianchun Xu, Ke Bi, Yanan Hao
Summary: To improve the energy storage density of capacitors, the ferroelectric phase poly(vinylidene fluoride) (PVDF) is introduced as a modifier. Blending PVDF-doped PMMA composites enhances the polarization strength but sacrifices the breakdown strength due to the presence of defects. To address this issue, a double-layer structure is designed with controlled interfacial bonding achieved through hot pressing. This work successfully achieves high discharge energy density and maintains energy efficiency in PMMA and PVDF composite films.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Maria F. Pantano, Christos Pavlou, Maria Giovanna Pastore Carbone, Costas Galiotis, Nicola M. Pugno, Giorgio Speranza
Summary: In this study, ultrathin PMMA films were evaluated for their mechanical behavior using a homemade nanomechanical device, showing a surprisingly high strain at failure and development of crazes during tensile loading, but without premature fracture. This work may pave the way for the development of glassy thermoplastic films with high ductility at ambient temperatures.
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
Chemistry, Multidisciplinary
Yoshihisa Fujii, Taiki Tominaga, Daiki Murakami, Masaru Tanaka, Hideki Seto
Summary: This study investigates the dynamic behavior of water molecules and polymer chains in a hydrated PMMA matrix. Results show that water molecules accelerate the dynamics of polymer chains, while individual water molecules move slower than bulk water.
FRONTIERS IN CHEMISTRY
(2021)
Article
Polymer Science
Navid Chapman, Mingyu Chapman, William B. Euler
Summary: The morphology of sub-micron poly(methyl methacrylate) films coated onto glass supports by spin coating from toluene was investigated, revealing wrinkled surfaces with local quasi-sinusoidal periodicity on films thicker than 75 nm. The surface wrinkles, attributed to convective instabilities, had large aspect ratios with wavelengths in the tens of microns and amplitudes in the tens of nanometers. The study also explored the effects of film thickness, coating solution concentration, and drying rate on the thin film surface morphology.
Article
Engineering, Environmental
Xiaobing Tang, Nadeesha Lakmali Kothalawala, Yulin Zhang, Dali Qian, Doo Young Kim, Fuqian Yang
Summary: This study demonstrates the successful production of microsized CsPbBr3 crystals and CsPbBr3 nanocrystals using deionized water as the precursor solvent, showing their potential applications in flexible LCD backlights. The nanocrystals exhibit high PL quantum yields and improved stability, providing a promising avenue for environmentally-friendly and bending-endurable backlight films in flexible display applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
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
Chemistry, Physical
Yuhui Yang, Jiali He, Yizhi Zhang, Yongming Hong, Xinping Wang
Summary: Analysis using SFG vibrational spectroscopy detected distinct interface structures between water-based and solvent-based polymer coatings. Water-based PMMA coatings showed SDS and water molecules at the interface, while solvent-based PMMA coatings exhibited direct contact between PMMA chains and the substrate. Heat treatment was found to enhance the interface structure of water-based PMMA coatings, revealing the molecular level origin of the adhesion strength difference between water-based and solvent-based polymer coatings.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Y. Aylin Esquivel-Lozano, Felipe Lopez-Saucedo, Emilio Bucio
Summary: By grafting reactions with acrylic monomers, polytetrafluoroethylene (PTFE) can enhance its hydrophilic behavior and improve its application potential. Experimental parameters such as dose, solvent, and monomer concentration were studied, and the new material was analyzed using various characterization methods.
RADIATION PHYSICS AND CHEMISTRY
(2022)
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
Materials Science, Multidisciplinary
Talaat A. Hameed, F. Mohamed, Salwa L. Abd-El-Messieh, A. A. Ward
Summary: This study synthesized (MAPbI(3))/PMMA nanocomposites and investigated their structure, optical, morphological, and electrical properties. The results showed that the nanocomposites exhibited promising photocatalytic activity and antistatic behavior.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Gnana Saurya Vankayalapati, Ethan Kaplan, Lisa M. Lallo, Nikhil Victor, Craig M. Clemons, John M. Considine, Kevin T. Turner
Summary: Cellulose nanofibrils (CNFs) show promise as reinforcements for polymer fibers, enhancing their strength, stiffness, and fracture toughness. Composite fibers of Poly(methyl methacrylate) (PMMA) and CNFs with varied CNF content were successfully fabricated, leading to significant improvements in mechanical properties. The addition of low-weight fractions of CNFs resulted in increased Young's modulus, yield strength, and fracture toughness in the composite fibers.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Mengmeng Wang, Xianrong Liang, Heng Wu, Linlin Huang, Gang Jin
Summary: In this study, super toughened PLA-based blends were successfully prepared by melt blending PLA with EVA and compatibilizing with E-MA-GMA. The addition of E-MA-GMA promoted phase adhesion and increased interface thickness, resulting in a super-toughened blend with incomplete fracture behavior during impact tests. The maximum impact strength of 77.6 kJ/m(2) was achieved with 12 wt% E-MA-GMA in the ternary blend, showing a 27.7 times improvement over neat PLA. Rheological and micromorphology analysis demonstrated enhanced viscosity and reduced crystallinity in the ternary blends.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Polymer Science
Qifeng Wang, Sadaki Samitsu, Yoshihisa Fujii, Chiaki Yoshikawa, Toyohide Miyazaki, Hidekuni Banno, Izumi Ichinose
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
(2015)
Article
Polymer Science
F. Chen, D. Peng, Y. Ogata, K. Tanaka, Z. Yang, Y. Fujii, N. L. Yamada, C. -H. Lam, O. K. C. Tsui
Article
Chemistry, Multidisciplinary
Debabrata Payra, Masanobu Naito, Yoshihisa Fujii, Norifumi L. Yamada, Sachiko Hiromoto, Alok Singh
Article
Chemistry, Multidisciplinary
Debabrata Payra, Masanobu Naito, Yoshihisa Fujii, Yuki Nagao
CHEMICAL COMMUNICATIONS
(2016)
Article
Chemistry, Physical
Taizo Mori, Daisuke Ishikawa, Yusuke Yonamine, Yoshihisa Fujii, Jonathan P. Hill, Izumi Ichinose, Katsuhiko Ariga, Waka Nakanishi
Article
Chemistry, Multidisciplinary
Koichiro Hori, Norifumi L. Yamada, Yoshihisa Fujii, Tomomi Masui, Hiroyuki Kishimoto, Hideki Seto
Article
Polymer Science
Debabrata Payra, Yoshihisa Fujii, Sandip Das, Junko Takaishi, Masanobu Naito
Article
Polymer Science
Yudai Fukunaga, Yoshihisa Fujii, Seisuke Inada, Yoshihiro Tsumura, Mitsunori Asada, Masanobu Naito, Naoya Torikai
Article
Metallurgy & Metallurgical Engineering
Kenji Yamaoka, Yoshihisa Fujii, Naoya Torikai
Summary: The gelation behavior of aqueous methylcellulose (MC) solution was evaluated using quartz crystal microbalance (QCM) which measures nano-gram to micro-gram level changes in mass per unit area. The resonance frequency shift accompanying viscosity changes during gelation showed good agreement with gelation temperature obtained by visual observation and theology measurement. It was suggested that QCM is capable of evaluating interfacial viscoelasticity.
JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kenji Yamaoka, Yoshihisa Fujii, Naoya Torikai
Summary: The physical gelation of an aqueous methylcellulose (MC) solution in response to temperature change was evaluated using a quartz crystal microbalance (QCM), indicating that QCM allows for assessment of interfacial viscoelasticity and shows good consistency in observing gelation temperature and viscosity changes.
MATERIALS TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Yoshihisa Fujii, Taiki Tominaga, Daiki Murakami, Masaru Tanaka, Hideki Seto
Summary: This study investigates the dynamic behavior of water molecules and polymer chains in a hydrated PMMA matrix. Results show that water molecules accelerate the dynamics of polymer chains, while individual water molecules move slower than bulk water.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Kenji Yamaoka, Norifumi L. Yamada, Koichiro Hori, Yoshihisa Fujii, Naoya Torikai
Summary: Understanding the interfacial structure and physical properties of polymer materials is crucial for enhancing their functionality. This study utilized QCM and NR measurements to assess the viscoelasticity and structure of an aqueous methylcellulose solution near the gold interface. QCM provided information about the shear modulus accompanying gelation, while NR revealed interfacial segregation on the gold substrate.
Article
Polymer Science
Mitsuo Hara, Atsuki Kodama, Shohei Washiyama, Yoshihisa Fujii, Shusaku Nagano, Takahiro Seki
Summary: Polysiloxanes exhibit unique properties and can self-assemble into nanoscale structures in the presence of humidity-induced self-assembly (HiSA) behavior. The flexibility of the polysiloxane backbone, formation of ion aggregates, and hydrophilic-hydrophobic phase separation play important roles in the HiSA behavior.
Article
Engineering, Chemical
Sadaki Samitsu, Edhuan Ismail, Yoshihisa Fujii, Izumi Ichinose
Summary: High-density crosslinked polymer membranes with a thickness of several tens of nanometers were prepared using chemical vapor deposition (CVD) of propylamine (PA). The membranes had a composition of C3.0H4.7N0.8O0.4 and contained various functional groups. The pore sizes of the membranes were found to be 0.3-0.7 nm, and their porosity was approximately 10%. The study demonstrated the ability to tune the thickness, pore size, porosity, and density of these hydrophilic crosslinked membranes by adjusting the CVD parameters.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sirawit Pruksawan, Sadaki Samitsu, Yoshihisa Fujii, Naoya Torikai, Masanobu Naito
ACS APPLIED POLYMER MATERIALS
(2020)