Chen, Ran; Lu, Ying; Zhao, Jiayi; Jiang, Zhiyong; Men, Yongfeng
Two-step cavitation in semi-crystalline polymer during stretching at temperature below glass transition
Cavitation behavior in poly(4-methyl-1-pentene) upon stretching below glass transition temperature was investigated by in situ ultra-small angle X-ray scattering technique. Strong stress-whitening was observed indicating an extensive occurrence of cavitation in the material during tensile deformation below Tg. The X-ray scattering patterns suggest oriented disc-shaped cavities with normal mostly…
Tuning the morphology of functionalized silica using amphiphilic organosilanes
Besnard, Romain; Arrachart, Guilhem; Cambedouzou, Julien; Pellet-Rostaing, Stéphane
The co-condensation of tetraethoxysilane and an amphiphilic organosilane precursor containing an ammonium part is investigated in presence of different counter-ions. We highlight the morphological versatility offered by such “one pot” synthesis, resulting of the combinatory effects of the addition of tetraethoxysilane and of the nature of the counter-ion involved in…
Tunable Self-Assembly and Morphology-Dependent Photoconductivity of a Donor–Acceptor-Structured Diruthenium Complex
Sun, Meng-Jia; Zhang, Xinliang; Zhong, Yu-Wu; Zhan, Chuanlang; Yao, Jiannian
A donor–acceptor-structured diruthenium complex, 1(PF6)4, that contains an electron-deficient bridging ligand and electron-rich distal diarylamines modified with long aliphatic chains has been synthesized. By varying the solvent environments and assembly conditions, we obtained three different self-assembled nanostructures of 1(PF6)4, including zero-dimensional nanospheres, one-dimensional…
Triblock Copolymer Elastomers with Enhanced Mechanical Properties Synthesized by RAFT Polymerization and Subsequent Quaternization through Incorporation of a Comonomer with Imidazole Groups of about 2.0 Mass Percentage
Jiang, Feng; Fang, Chu; Zhang, Juan; Wang, Wentao; Wang, Zhigang
ABA triblock copolymer elastomers (TBCPEs) were first synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization, for which poly(isobornyl acrylate) (PIBA) was chosen as the dispersed hard microdomains, whereas poly(n-butyl acrylate)-co-poly(1-vinylimidazole) (P(BA-co-VI)) was chosen as the rubbery matrix. Two much distinct glass transition temperatures were found,…
Toward surfactant-free and water-free microemulsions
Fischer, Veronika; Marcus, Julien; Touraud, Didier; Diat, Olivier; Kunz, Werner
It was recently demonstrated that a nano-clustering was present in the monophasic “pre-Ouzo” region of ternary liquid mixtures without surfactants. The goal of this work is to check if this nano-clustering is also present in the surfactant-free and water-free “green” microemulsions glycerol/ethanol/1-octanol and deep eutectic solvent/tetrahydrofurfuryl alcohol/diethyl adipate. The deep…
Toughening biodegradable polylactide with nanopores
Peng, Ningxing; Ju, Yunhui; Lv, Ruihua; Na, Bing; Liu, Qingxian; Wang, Bin
The inherent brittleness of biodegradable polylactide (PLA) limits its large-scale applications. A common route for toughening PLA is to incorporate other components by blending. In achieving good toughness, however, other properties such as strength and transparency are usually sacrificed to a large extent. Here we presented a facile approach to…
Top-Pinning Controlled Dewetting for Fabrication of Large-Scaled Polymer Microwires and Applications in OFETs
Kan, Xiaonan; Xiao, Chengyi; Gao, Hanfei; Wang, Zhaohui; Wu, Yuchen; Su, Bin; Zhang, Jianqi; Wei, Zhixiang; Kong, Bin; Hu, Wenping; Sun, Yanming; Jiang, Lei; Heeger, Alan J.
A facile top-pining controlled dewetting strategy is developed to fabricate patterned polymeric 1D micro/nanostructures. Large-scaled polymer-polydithiophen-2-yl)-alt- pyridine] microwire arrays with mobility up to 29.0 cm2 V−1 s−1 are fabricated. The devices show excellent electrical stability in ambient conditions. This work paves the…
TNF Induced Switching of Columnar Rectangular to Hexagonal Assemblies in a New Class of Triphenylene-Based Room Temperature Discotic Liquid Crystals
Gupta, Monika; Gupta, Santosh Prasad; Pal, Santanu Kumar
A straightforward synthesis of triphenylene-based oligomeric systems that self-organize into room temperature columnar structures is presented. The compounds with longer spacer length (m = 10 and 12) exhibit columnar rectangular (Colr) mesophase whereas the compound with m = 8 exists in glassy Colr state. Interestingly, the Colr self-assembly of these…
The Template Determines Whether Chemically Identical Nanoparticle Scaffolds Show Elastic Recovery or Plastic Failure
Suresh, Karthika; Patil, Shivprasad; Ramanpillai Rajamohanan, Pattuparambil; Kumaraswamy, Guruswamy
Subtle variations in the preparation of ice-templated nanoparticle assemblies yield monoliths that are chemically identical but exhibit qualitatively different mechanical behavior. We ice template aqueous dispersions to prepare macroporous monoliths largely comprising silica nanoparticles held together by a crosslinked polymer mesh. When the polymer is crosslinked in the presence of…
Study of Iron-Bearing Dolomite Dissolution at Various Temperatures: Evidence for the Formation of Secondary Nanocrystalline Iron-Rich Phases on the Dolomite Surface
Debure, Mathieu; Andreazza, Pascal; Canizarès, Aurélien; Grangeon, Sylvain; Lerouge, Catherine; Mack, Paul; Madé, Benoît; Simon, Patrick; Veron, Emmanuel; Warmont, Fabienne; Vayer, Marylène
We investigated the dissolution of a natural Fe-containing dolomite under acidic conditions (pH 3–5.5) with atomic force microscopy (AFM) at 20 °C and with batch dissolution experiments at 80 °C. Dolomite dissolution proceeded by two identified mechanisms: removal of dolomite layers through spreading and coalescence of etch pits nucleated at…