Article
Chemistry, Applied
Min Liu, Guangqiang Guo, Zui Liu, Yongjie Yuan, Hailiang Zhang
Summary: In this article, the deformation behavior of photo-responsive liquid crystal elastomers (LCEs) was studied. By designing and synthesizing azobenzene LCE fibers with different glass transition temperatures, it was found that fibers with low glass transition temperature exhibited reversible photo-induced deformation behavior under alternating irradiation of 365 nm and 470 nm light, while fibers with high glass transition temperature showed photo-induced periodical swing deformation. The periodical swing deformation of LCE fibers was realized by periodically turning on and off 470 nm light.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Polymer Science
Zhenlin Zhang, Zhulu Xie, Chen Nie, Si Wu
Summary: Azobenzene is a photoswitchable compound that can be used as a promising candidate for photoresponsive materials. The structure of azobenzene-containing polymers plays an important role in their photoresponsive properties and applications. Azobenzene-terminated polymers exhibit good photoresponsive properties in solutions, gels, and bulk materials, and have potential applications based on hydrophobic-to-hydrophilic changes and solid-to-liquid transitions.
Article
Polymer Science
Xudong Wu, Ye Yuan, Shiwei Zhao, Yuan Lei, Xiaowei Fu, Jingxin Lei, Liang Jiang
Summary: This study discovered the synergistic effects between liquid crystal and crystalline phase, and successfully introduced azobenzene molecules into polyurethane elastomers to prepare azobenzene liquid-crystal elastomers (ALCEs). The synthetic ALCEs can utilize the reversible isomerism capability of azobenzene molecules to achieve large macroscopic deformation under light irradiation. Compared to traditional azobenzene materials, the ALCEs exhibit higher bending speed and recovery rate.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xinyi Pan, Zixuan Zhu, Yaning He
Summary: In this study, we successfully prepared azobenzene decorated PEG single crystal for the first time. The azobenzene terminated PEG was synthesized through nucleophilic substitution reaction between tosylate ended PEG and 4-hydroxy-4'-methoxy azobenzene. Square-shaped crystals were obtained using self-seeding approach. The photo-responsive behavior of azobenzene was studied by UV-vis spectra, and the trans-cis isomerization of azobenzene occurred well, indicating that the attached azobenzene groups had loose surroundings in the single crystal.
Article
Polymer Science
Laurence Pessoni, David Siniscalco, Anne Boussonniere, Anne-Sophie Castanet, Laurent Billon, Nicolas Delorme
Summary: In this study, a series of azopolymers were synthesized using Nitroxide Mediated Polymerization (NMP), and the photo-isomerization properties and photo-reversible solid-to-liquid transitions were investigated. The results showed that both the molecular weight and chemical structure of the azopolymers influenced the transition characteristics, with longer substituents or linkers leading to faster transitions. These findings contribute to a better understanding of the mechanism behind the photo-reversible solid-to-liquid transition and provide insights for the design of novel azopolymers.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Kenta Homma, Alice C. Chang, Shota Yamamoto, Takeshi Ueki, Jun Nakanishi
Summary: The non-canonical photoisomerization-induced phase separation of an azobenzene-bearing polymer is observed, where the phase separation occurs under different isomerization conditions depending on the molecular weight. Contrary to common perception, the phase separation of this polymer is not solely determined by polarity changes during isomerization, suggesting the significant role of molecular weight in the phase behavior of azobenzene-bearing polymers.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sebastian Fredrich, Tom Engels, Albert P. H. J. Schenning
Summary: Azobenzene liquid crystal polymers with retained unpolymerized monomers can exhibit multistable deformation states through manual bending and irradiation. These materials have the potential for biomedical and microfluidic applications where light-induced, multistable states are desired and harmful UV-light needs to be avoided.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Takuya Ohzono, Emiko Koyama
Summary: This study demonstrates a method for creating glaring patterns with strong anisotropic light diffusion using light-sensitive liquid crystal elastomers. The mechanisms behind the formation of these patterns are explained. With their erasable properties, these patterns can be applied in optical elements and sign-sheeting applications.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Applied
J. M. Herrera, M. E. Penoff, M. J. Galante
Summary: The authors synthesized a fluorinated epoxy-isocyanate thermosetting coating modified with an azobenzene derivative. By UV irradiation, the fluorinated azobenzene derivative migrated to the coating surface, resulting in changes in the surface hydrophobicity. These reversible photo-induced surface property switching coatings have potential applications in various technological fields.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Physical
Himani Malik, Thomas Halbritter, Alexander Heckel, Thiruvancheril G. Gopakumar
Summary: A new class of pyridine-based spiropyran exhibits reversible photoinduced switching between closed SP and ring-open merocyanine states. In a condensed crystalline monolayer on graphite, SP can be quantitatively converted to MC under UV irradiation, while in solution only about 10% of SP can transform to MC due to a photostationary state. By applying an electric field with an STM tip, single molecules can be reversibly switched between SP and MC forms in their condensed phases without any threshold voltage at ambient conditions. The microscopic structure of submonolayer films of SP and MC are investigated using AFM and STM.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Zi-Yun Zhang, Jiang-Tao Sun, Chun-Yang Li, Ya-Ping Liu, Zhong-Xin Ge, Ying-Gang Jia, Mei Tian, Dan-Shu Yao
Summary: In this study, two azo liquid crystal monomers and a chiral liquid crystal monomer were synthesized to prepare liquid crystalline polymers. The synthesized polymers exhibited good liquid crystal properties and thermal stability, making them suitable for applications in liquid crystal materials.
Article
Chemistry, Physical
Ezequiel R. Soule
Summary: This study investigates the isomerization and phase behavior of azobenzenes using a theoretical model, and predicts that the presence of nematic ordering increases the rate of cis-to-trans isomerization. The study also analyzes the photo-induced phase transitions as a function of temperature and irradiation.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yasuo Norikane, Masaru Hayashino, Mio Ohnuma, Koji Abe, Yoshihiro Kikkawa, Koichiro Saito, Kengo Manabe, Koji Miyake, Miki Nakano, Naoki Takada
Summary: The study found that crystals exhibit crawling motion on glass substrates with different surface properties when exposed to UV and visible light. On hydrophilic surfaces, crystals crawled faster but showed spreading, while on hydrophobic surfaces, they displayed little shape change and slower crawling motion. The interaction of melted azobenzene with glass surfaces was identified as playing a crucial role in the crawling motion, with proposed models explaining the asymmetrical conditions leading to directional motion.
FRONTIERS IN CHEMISTRY
(2021)
Article
Polymer Science
Yuan Lei, Ye Yuan, Shiwei Zhao, Anqian Yuan, Shiyi Zhou, Yao Xiao, Jingxin Lei, Liang Jiang
Summary: In this study, a novel azobenzene photo-responsive liquid crystal elastomer (HAzo-LCEs) was prepared by introducing azo-benzene molecules and UPy units into the main chain of a polyurethane molecule. The HAzo-LCEs demonstrated exceptional mechanical performance and rapid response, with the ability to transform from polydomain to monodomain liquid crystal structures at low temperatures. The HAzo-LCEs exhibited high sensitivity and flexible adjustability, making it a valuable material for sensor and actuator applications.
Article
Biochemistry & Molecular Biology
Jae Gwang Kim, Jae Gyeong Lee, Jeong Jae Wie
Summary: This study reports the polymerization of liquid crystalline polymeric fibers in non-spherical droplets and micro-channels, resulting in curvilinear and randomly networked filaments as well as highly aligned linear fibers, respectively. The controlled molecular assembly achieved through micro-confinement suggests a unique opportunity for programming material architecture.
Article
Polymer Science
Christyan de Santiago-Solis, Rosa Julia Rodriguez-Gonzalez, Leticia Larios-Lopez, Olga Lidia Torres-Rocha, Isaura Felix-Serrano, Geminiano Martinez-Ponce, Damaso Navarro-Rodriguez
JOURNAL OF APPLIED POLYMER SCIENCE
(2017)
Article
Chemistry, Physical
Olga Lidia Torres-Rocha, Leticia Larios-Lopez, Rosa Julia Rodriguez-Gonzalez, Isaura Felix-Serrano, Damaso Navarro-Rodriguez
JOURNAL OF MOLECULAR LIQUIDS
(2017)
Article
Chemistry, Analytical
Sergio Calixto, Geminiano Martinez-Ponce, Guillermo Garnica, Susana Figueroa-Gerstenmaier
Article
Optics
Azael Mora-Nunez, Geminiano Martinez-Ponce, Guillermo Garcia-Torales, Anuar Beitran-Gonzalez
OPTICAL ENGINEERING
(2018)
Article
Materials Science, Multidisciplinary
Marisol Reyes-Reyes, Roman Lopez-Sandoval, Eduardo Tovar-Martinez, Jorge Cabrera-Salazar, Geminiano Martinez-Ponce
Article
Materials Science, Multidisciplinary
J. E. Alba Rosales, G. Ramos-Ortiz, G. Martinez-Ponce, R. Castro-Beltran, L. Polo-Parada, G. Gutierrez-Juarez
RESULTS IN PHYSICS
(2018)
Article
Chemistry, Inorganic & Nuclear
Moises Alberto Valdes-Pech, Leticia Larios-Lopez, Rosa Julia Rodriguez-Gonzalez, Isaura Felix-Serrano, Nayely Trejo-Carbajal, Damaso Navarro-Rodriguez
JOURNAL OF FLUORINE CHEMISTRY
(2019)
Article
Chemistry, Inorganic & Nuclear
Cinthya Valeska Castro-Perez, Nayely Trejo-Carbajal, Rosa Julia Rodriguez-Gonzalez, Leticia Larios-Lopez, Isaura Felix-Serrano, Damaso Navarro-Rodriguez
JOURNAL OF FLUORINE CHEMISTRY
(2019)
Article
Polymer Science
Marco A. De Jesus-Tellez, Isaura Felix-Serrano, Rosa Julia Rodriguez-Gonzalez, Damaso Navarro-Rodriguez, Leticia Larios-Lopez
Article
Chemistry, Inorganic & Nuclear
Liliette Barcelona-Cazanave, Nayely Trejo-Carbajal, Rosa Julia Rodriguez-Gonzalez, Leticia Larios-Lopez, Isaura Felix-Serrano, Jose Manuel Mata-Padilla, Damaso Navarro-Rodriguez
Summary: This study focuses on the synthesis and thermotropic behavior of a hexyloxy-substituted pyridyl-ethynylene-azobenzene and its halogen-bonded complex with tetrafluoroiodophenyl decanoate. The reported complex is a highly anisotropic photoactive mesogen that displays only smectic-type order and appears to be stable in solution.
JOURNAL OF FLUORINE CHEMISTRY
(2021)
Article
Physics, Applied
Misael Ruiz-Veloz, Geminiano Martinez-Ponce, Rafael I. Fernandez-Ayala, Rigoberto Castro-Beltran, Luis Polo-Parada, Bartolome Reyes-Ramirez, Gerardo Gutierrez-Juarez
Summary: This study investigates the propagation of laser-induced ultrasound under thermal and stress confinement conditions and the mathematical modeling when these conditions are not met. By obtaining an exact solution of the boundary value problem for the 1D-wave equation in both the frequency and time domain, the role of thermal correction in overcoming theoretical signal decay issues is discussed.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Paper & Wood
Danay Hernandez-Lopez, Jaiver Chicangana-Cifuentes, Yanier Ojeda-Morales, Leticia Larios-Lopez, Geminiano Martinez-Ponce
Summary: P ristine nanopaper sheets were prepared by drop-casting water-based cellulose nanocrystals solutions with different solute concentrations and hydrogen potential values of the solvent. The optical properties associated with the microscopic structure of the substrates were assessed using imaging Mueller matrix polarimetry. Despite the expected depolarizing features in this kind of media, optical anisotropic parameters were measured at the microscopic level. The spatial distribution of birefringence depended not only on the raw material nanoconformation, but also on the applied processing method. The structural evaluation of nanopaper can contribute to the understanding and optimization of the optical response of sensing devices supported by these multifunctional materials.
Proceedings Paper
Engineering, Aerospace
Azael Mora-Nunez, Geminiano Martinez-Ponce, Guillermo Garcia-Torales, Marija Strojnik, Beethoven Bravo-Medina, Luis-Bernache-Santana
INFRARED REMOTE SENSING AND INSTRUMENTATION XXVII
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Amanda D. Salas-Caridad, Geminiano Martinez-Ponce, Rodolfo Martinez-Manuel
INFRARED SENSORS, DEVICES, AND APPLICATIONS VII
(2017)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.
