Wei, Dandan; Yang, Jia; Zhu, Lin; Chen, Feng; Tang, Ziqing; Qin, Gang; Chen, Qiang
Semicrystalline Hydrophobically Associated Hydrogels with Integrated High Performances
Hydrophobically associated hydrogels (HA gels) are one of most extensively investigated high strength hydrogels. Semicrystalline HA gels, prepared by micellar copolymerization, show high strength and notable functionalities of self-healing and shape-memory. However, the hydrophobic comonomers in these semicrystalline HA gels are usually limited to the long alkyl length monomers…
Shape memory property and underlying mechanism by the phase separation control of poly(ϵ-caprolactone)/poly(ether-b-amide)
Liu, Xinran; Huang, Miaoming; Zhu, Ping; Dong, Siyuan; Dong, Xia; Wang, Dujin
In this work, a poly(ϵ-caprolactone)/poly(ether-b-amide) blend with weight ratio 35/65 was prepared by solution mixing and compression molding. A simple and sensible method to control the phase separation structure was introduced by adjusting the temperature and time for the process of phase separation. Samples with obviously different morphology were obtained…
Solvent-Controlled Assembly of Aromatic Glutamic Dendrimers for Efficient Luminescent Color Conversion
Xing, Pengyao; Yang, Chaolong; Wang, Yang; Phua, Soo Zeng Fiona; Zhao, Yanli
A binary supramolecular system where self-sorting and coassembly behavior can be switched by changing the solvent polarity is hereby reported. Glutamic dendron is separately conjugated with pyrene and naphthalimide luminophores through an alkyl spacer. The resulting structurally similar building units can self-assemble into one-dimensional micro/nanostructures with hexagonal and lamellar packing,…
Structural analysis of mtEXO mitochondrial RNA degradosome reveals tight coupling of nuclease and helicase components
Razew, Michal; Warkocki, Zbigniew; Taube, Michal; Kolondra, Adam; Czarnocki-Cieciura, Mariusz; Nowak, Elzbieta; Labedzka-Dmoch, Karolina; Kawinska, Aleksandra; Piatkowski, Jakub; Golik, Pawel; Kozak, Maciej; Dziembowski, Andrzej; Nowotny, Marcin
The mitochondrial RNA degradosome (mtEXO) plays an essential role in the regulation of mitochondrial gene expression and is composed of the 3′-to-5′ exoribonuclease Dss1 and the helicase Suv3. Here the authors present the RNA bound mtEXO crystal structure and give insights into its…
Structural and Dynamic Heterogeneity in the Amorphous Phase of Poly(l,l-lactide) Confined at the Nanoscale by the Coextrusion Process
Nassar, Samira Fernandes; Domenek, Sandra; Guinault, Alain; Stoclet, Gregory; Delpouve, Nicolas; Sollogoub, Cyrille
Multi-nanolayered polystyrene/poly(l,l-lactide) (PS/PLLA) films were obtained by the layer-multiplying coextrusion process, with an individual PLLA layer thickness as thin as 20 nm. The confinement of the amorphous PLLA induced a change in the molecular mobility, evidenced by a drop of the cooperative rearranging region (CRR) size at the glass transition.…
Stable biexcitons in two-dimensional metal-halide perovskites with strong dynamic lattice disorder
Thouin, Félix; Neutzner, Stefanie; Cortecchia, Daniele; Dragomir, Vlad Alexandru; Soci, Cesare; Salim, Teddy; Lam, Yeng Ming; Leonelli, Richard; Petrozza, Annamaria; Kandada, Ajay Ram Srimath; Silva, Carlos
With strongly bound and stable excitons at room temperature, single-layer, two-dimensional organic-inorganic hybrid perovskites are viable semiconductors for light-emitting quantum optoelectronics applications. In such a technological context, it is imperative to comprehensively explore all the factors --- chemical, electronic and structural --- that govern strong multi-exciton correlations.…
Structural transformation from shish-kebab crystals to micro-fibrils through hot stretching process of gel-spun ultra-high molecular weight polyethylene fibers with high concentration solution
An, Minfang; Lv, You; Yao, Guibin; Zhang, Li; Wang, Zongbao
Structural evolution of gel-spun ultra-high molecular weight polyethylene fibers with high concentration solution via hot stretching process was investigated by in situ small-angle X-ray scattering, in situ wide-angle X-ray diffraction measurements, scanning electron microscopy, and differential scanning calorimetry. With the increase of stretching strain, the long period continuously increases…
Supramolecular self-assembly of thiol functionalized pentaalkynylbenzene-decorated gold nanoparticles exhibiting a room temperature discotic nematic liquid crystal phase
Gupta, Monika; Mohapatra, Subhransu Sekhar; Dhara, Surajit; Pal, Santanu Kumar
Thiol terminated pentaalkynylbenzene (PA) units were synthesized for coating on gold nanoparticles (GNPs) in order to obtain materials with a combination of the properties of GNPs and discotic nematogens. The PA unit with the longest terminal alkyl spacer was found to exhibit a discotic nematic (ND) mesophase at room temperature…
Subsequent but Independent Cavitation Processes in Isotactic Polypropylene during Stretching at Small- and Large-Strain Regimes
Lyu, Dong; Chen, Ran; Lu, Ying; Men, Yongfeng
Isotactic polypropylene (iPP) samples with different molecular weights were used to investigate the relationship between cavitation processes triggered at small- and large-strain regimes. The cavitation triggered at large strains was observed in all deformation cases regardless of the occurrence of cavitation activated at small strain. The initiation of the large-strain-cavitation…
Synthesis and characterization of poly(ester amide amide)s of different alkylene chain lengths
Girard, Clément; Gupta, Manisha; Lallam, Abdelaziz; Anokhin, Denis V.; Bovsunovskaya, Polina V.; Akhyamova, Azaliya F.; Melnikov, Alexey P.; Piryazev, Alexey A.; Rodygin, Alexander I.; Rychkov, Andrey A.; Grafskaya, Kseniia N.; Shabratova, Ekaterina D.; Zhu, Xiaomin; Möller, Martin; Ivanov, Dimitri A.
In this work, a series of aliphatic biodegradable poly(ester amide amide) polymers was synthesized by melt polycondensation of a tailor-made amide-containing monomer based on 1,4-diaminobutane and ε-caprolactone and different dicarboxylic acid methyl esters with even number of methylene groups. The synthesized polymers were characterized by 1H NMR, FT-IR spectroscopy, GPC,…