Koh, J. Justin; Zhang, Xiwen; Kong, Junhua; He, Chaobin
Compatibilization of multicomponent composites through a transitioning phase: Interfacial tensions considerations
A novel interfacial compatibilization technique for incompatible polymer blends or composites is proposed, in which a transitioning layer was introduced between the matrix and the dispersed phase of the otherwise incompatible components. The transitioning phase should have good interactions with both the components, resulting in lower interfacial energy between the…
Chirality inversion, supramolecular hydrogelation and lectin binding of two thiolactose amphiphiles constructed on a di-lauroyl-L-tartaric acid scaffold
Cano, María Emilia; Chenna, Pablo Héctor Di; Lesur, David; Wolosiuk, Alejandro; Kovensky, José; Uhrig, María Laura
Herein we report the synthesis, characterization and self-assembly properties of two new thiolactose based amphiphiles constructed on a di-lauroyl-L-tartaric acid scaffold that only differ in the length of the spacer by an ethylene glycol unit. Upon dissolution in hot water the amphiphiles give rise to different colloidal systems at 25…
Characterization of ketoprofen-loaded PEG-CH semi-IPN system for wound dressing application
Gaitán‐Tolosa, Ibeth M.; Montiel‐Campos, Raúl; Flores‐Estrada, Jaime; Domínguez‐García, Ma Victoria; Flores‐Merino, Miriam V.
Polymer systems, in the form of crosslinking networks, have been widely used in biomedicine. However, they are a challenge mainly due to the impact of their physicochemical properties on release kinetics of drugs. Ketoprofen is an analgesic anti-inflammatory drug with short half-life (
Cavitation in Poly(4-methyl-1-pentene) during Tensile Deformation
Chen, Ran; Lu, Ying; Jiang, Zhiyong; Men, Yongfeng
The poly(4-methyl-1-pentene) sample was used to investigate the cavitation-induced stress-whitening phenomenon during stretching at different temperatures via the ultrasmall-angle X-ray scattering technique. Two modes of cavitation were found that mode I cavitation activated around yield point followed by mode II cavitation generated in highly oriented state. The critical strain for…
Asynchronous fracture of hierarchical microstructures in hard domain of thermoplastic polyurethane elastomer: Effect of chain extender
Guo, Yaqian; Zhang, Ruoyu; Xiao, Qiang; Guo, Hongxia; Wang, Zongbao; Li, Xing; Chen, Jing; Zhu, Jin
Four chain extenders, 1,3-propanediol (PDO), 2-methyl-1,3-propanediol (MPO), 2,2-dimethyl-1,3-propanediol (NPG) and 2,2,4,4-tetramethyl-1,3-cyclobutanedio (CBDO) are chosen to synthesize model polyurethanes, respectively. Although with similar oxygen distance between the two hydroxyl groups, their volumes increase gradually according to computer simulation. As expected, the degree of microphase…
Assembly and photochemical properties of mesoporous networks of spinel ferrite nanoparticles for environmental photocatalytic remediation
Skliri, Euaggelia; Miao, Jianwei; Xie, Jian; Liu, Guangfeng; Salim, Teddy; Liu, Bin; Zhang, Qichun; Armatas, Gerasimos S.
Spinel ferrite materials have an electronic band structure that is well suited for visible light-induced catalysis, however, their photocatalytic activity remains low due to the daunting charge-carrier separation process. In this article, we report that high-surface-area mesoscopic architectures composed of tightly connected ultrasmall spinel ferrite nanocrystals can efficiently suppress…
Are Keggin’s POMs Charged Nanocolloids or Multicharged Anions?
Malinenko, Alla; Jonchère, Alban; Girard, Luc; Parrès-Maynadié, Sandra; Diat, Olivier; Bauduin, Pierre
Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM–POM electrostatics repulsions on their self-diffusion in water by varying POM and supporting salt concentrations. The self-diffusion coefficients of two Keggin’s POMs [silicotungstate (SiW12O404–)…
Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1
Zorn, Reiner; Yin, Huajie; Lohstroh, Wiebke; Harrison, Wayne; Budd, Peter M.; Pauw, Brian R.; Böhning, Martin; Schönhals, Andreas
Polymers with intrinsic microporosity are promising candidates for the active separation layer in gas separation membranes. Here, the vibrational density of states (VDOS) for PIM-1, the prototypical polymer with intrinsic microporosity, is investigated by means of inelastic neutron scattering. The results are compared to data measured for a more conventional…
Acceleratory and inhibitory effects of uniaxial tensile stress on the photo-oxidation of polyethylene: Dependence of stress, time duration and temperature
Liu, Qiang; Yang, Heng; Zhao, Jincan; Liu, Shixiang; Xia, Lei; Hu, Ping; Lv, Yadong; Huang, Yajiang; Kong, Miqiu; Li, Guangxian
The photo-oxidation behavior of high density polyethylene (HDPE) subjected to uniaxial tensile stress is investigated at various temperatures, tensile stress levels and time durations. The effect of stress on the photo-oxidation rate of HDPE is found to be non-monotonous. Tensile stress is found to play distinctly different roles, namely showing…
Aerogels of hierarchically porous syndiotactic polystyrene with a dielectric constant near to air
Joseph, Angel Mary; Nagendra, Baku; Shaiju, P.; Surendran, K. P.; Gowd, E. Bhoje
Herein ultralow density aerogels are developed through a feasible freeze casting technique. Briefly, the syndiotactic polystyrene (sPS) gel was prepared using xylene and subjected to successive steps of solvent exchange using non-solvents like ethanol and water. These samples were freeze-dried to obtain aerogels of the same shape and size as…