Article
Materials Science, Multidisciplinary
You Wu, Yin-Ning Zhou, Qun-Jie Xu, Jin-Jin Li, Zheng-Hong Luo
Summary: Two well-defined amphiphilic block copolymers were synthesized through activators regenerated by electron transfer atom transfer radical polymerization, which served as stabilizers for preparing styrene and methyl methacrylate containing HIPEs. The block copolymer stabilized HIPEs and polyHIPEs showed higher strength compared to samples stabilized by span80, with PS-based polyHIPEs having a closed-cell structure and PMMA-based polyHIPEs having an open-cell structure. The concentration of stabilizer played a critical role in preparing high-porosity PMMA-based polyHIPEs. Other functional polymeric porous monoliths can be readily prepared through HIPE templating using commonly known PEO-PS block copolymers.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Polymer Science
Areen A. Bani-Salameh, A. A. Ahmad, A. M. Alsaad, I. A. Qattan, Ihsan A. Aljarrah
Summary: This study synthesized hybrid thin films based on PMMA and PS doped with different concentrations (1%, 3%, 5%, 7%) of CeO2 NPs. The results indicated that with increasing CeO2 NPs concentration, the optical band gap energy of PMMA-PS/CeO2 NPs thin films decreased significantly, with high transmittance in the low-energy region and a sharp decrease in the high-energy region.
Article
Chemistry, Physical
Thibaut Lalire, Aurelie Taguet, Jean-Claude Roux, Belkacem Otazaghine, Claire Longuet
Summary: This work focuses on controlling the localization of nanoparticles in a PMMA/PS polymer blend. A comprehensive study was conducted on PMMA/PS/graphene nanocomposites through melt-blending process. The morphology and chemical structure evolution of graphene nanoparticles during the process were investigated to explain their final localization.
Article
Polymer Science
Bastian Grabe, Wolf Hiller
Summary: This study presents a new method to determine the molar mass distribution of block copolymers using nuclear magnetic resonance diffusion ordered spectroscopy with inverse Laplace transform. The results show that the DOSY approach, combined with dual detector size exclusion chromatography, accurately determines the molar mass distribution of block copolymers.
Article
Polymer Science
Yongyan Pang, Xin Zhang, Bingjie Guo, Zhijun Wang, Wenxiang Fang, Jiang Li, Wenge Zheng
Summary: This study investigated the variation of cell structure in multilayered PS/PMMA foams with increasing layer numbers. Three types of cell structures were observed as the layer number increased: alternating big-cell/small-cell layers, alternating foam/film layers, and almost uniform cell structure. The thickness of the layers was identified as a crucial factor in determining the formation and variation of the cell structure.
Article
Spectroscopy
Jiho Kim, Wooseop Lee, Hyeji Kim, Du Yeol Ryu, Hyungju Ahn, Boknam Chae
Summary: A non-invasive, image-based analytic method using scattering-type scanning near-field optical microscopy (s-SNOM) is proposed to evaluate the phase separation behavior of lamella-forming polymer films, and the influence of self-assembly processes on the spatial distribution of polymer components is investigated.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Nanoscience & Nanotechnology
Hongbo Hao, Shuangjun Chen, Jiaxing Ren, Xuanxuan Chen, Paul Nealey
Summary: This study investigated the effect of the ionic liquid HMHF on the line edge roughness of PS-b-PMMA self-assembled patterns and found that a small amount of HMHF can improve the photolithography compatibility of PS-b-PMMA and reduce the LER value.
Article
Polymer Science
Tomoka Yoshimura, Tomofumi Morishita, Yoshihiro Agata, Kodai Nagashima, Kevin Wylie, Yuta Nabae, Teruaki Hayakawa, Makoto Ouchi
Summary: We achieved long-range ordered lamellar formation in PS-PMMA block copolymers by introducing oligopeptides at the junction. The structure of the oligopeptides determined the formation of a periodic lamellar structure in the block copolymers, with the hexFFFFhex sequence showing the best results.
Article
Nanoscience & Nanotechnology
Dusan Mrdenovic, Daniel Abbott, Victor Mougel, Weitao Su, Naresh Kumar, Renato Zenobi
Summary: This article introduces a sensitive nanoanalytical method, combining TERS, AFM, confocal Raman spectroscopy, and XPS, to determine the phase separation in polymer blend films. The study reveals the vertical phase separation at the top ca. 20 nm of the blend surface and lateral phase separation in the bulk.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Characterization & Testing
Petra Christoefl, Caterina Czibula, Michael Berer, Gernot Oreski, Christian Teichert, Gerald Pinter
Summary: Instrumented nanoindentation was utilized to examine the viscoelastic properties of PMMA as an amorphous polymer model. Evaluation methods combining adhesive contact and empiric models were applied to determine the elastic moduli, and comparison with AFM-NI and compression tests were conducted. The results showed good agreement between NI and AFM-NI, with only slightly lower values obtained with the O&P based AFM-NI method.
Article
Chemistry, Multidisciplinary
Yuanhui Sun, Maosheng Miao
Summary: The recent discoveries of metal superhydrides provide a new route to room-temperature superconductors. The understanding of superhydrides formation needs a perspective beyond the traditional chemical bonds. High-throughput calculation results show that the remaining metal lattices exhibit large electron occupations of the nonatomic interstitial orbitals, matching excellently to H lattices and their wave functions like a template. Furthermore, H lattices consist of 3D aromatic building units that are greatly stabilized by chemical templates of metals near the s-d border.
Article
Polymer Science
Mahesh Jachak, Rupali Bhise, Ankur Chaturvedi, Vidula Kamble, Ganapati Shankarling
Summary: This article presents the synthesis and application of two highly fluorescent compounds in polymers. The fluorescent properties and spectral changes were investigated, along with the thermal and photostability of the synthesized compounds. This study provides detailed information for the application of fluorescent polymers in optoelectronic technology and coatings.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2022)
Article
Polymer Science
Julia Resch, Julia Dreier, Christian Bonten, Marc Kreutzbruck
Summary: This study investigated the phase separation of PMMA/SAN blends using a novel nanoscale AFM-IR technique, which allowed for the chemically identification and precise classification of phase morphology within the nm-regime. The research showed that in the miscible domain, no individual phases could be detected down to the nanometer range, but with increasing temperature, two different phases were formed with sharply defined boundaries. The onset of these changes was identified at temperatures around 100°C.
Article
Nanoscience & Nanotechnology
Wei Cao, Shanshan Yin, Martina Plank, Andrei Chumakov, Matthias Opel, Wei Chen, Lucas P. Kreuzer, Julian E. Heger, Markus Gallei, Calvin J. Brett, Matthias Schwartzkopf, Artem A. Eliseev, Evgeny O. Anokhin, Lev A. Trusov, Stephan Roth, Peter Mueller-Buschbaum
Summary: The study focuses on utilizing spray deposition technique to fabricate hybrid films with perpendicular magnetic anisotropy, by controlling the orientation of nanoparticles and polymers, and further tuning their magnetic properties through solvent vapor annealing. The results demonstrate the potential applications of spray-deposited hybrid films in magnetic data storage and sensors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Polymer Science
Fumiki Honma, Jiro Kumaki
Summary: A hydrophilic polymer can spread as a monolayer on a water surface, while a polymer without a hydrophilic group forms aggregates. PS-b-PMMA-b-PS can be used to prepare PS single-block particles without aggregation. The PMMA block in the PMMA monolayer is elongated and interpenetrated with the matrix chains.