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A new strategy to toughen epoxy resins through control of topological structure of cross-linking network has been presented. With a tertiary amine initiator, the curing proceeded via chain-wise polymerization. The impact strength of epoxy resin increased to above 84 kJ/m2 by only increasing the curing temperature, which is much higher than the reported value of 10–30 kJ/m2 for pure epoxy resin. Meanwhile,...
A series of rare earth triflates (RE(OTf) 3 , RE = Sc, Y and Lu) were used for the first time as moisture-stable precursors to generate rare earth alkoxide complexes through an in situ reaction with sodium alkoxides (NaOR) in tetrahydrofuran. 1 H NMR and 13 C NMR results confirmed the fast ligands exchange process and the formation of rare earth–oxygen (RE–OR) bond. The in...
Generally polymer bulk structures and nanostructures are thermally insulative. In this study, we show that an improved nanoporous template wetting technique can prepare thermally conductive polymer nanowire arrays. The thermal conductivities of the fabricated high-density polyethylene (HDPE) nanowire arrays with diameters of 100 nm and 200 nm, measured by a laser flash method, are about 2 orders of...
Novel supramolecular system of amphiphilic hyperbranched polymer with hyperbranched poly(β-cyclodextrin) core was designed and synthesized to accomplish a so-called selective encapsulation, where two types of guest molecules can be encapsulated into two types of molecular cavities from β-cyclodextrin (β-CD) and topography structure of hyperbranched polymer, respectively. The double molecular recognition...
A controllable approach to synthesize UV curable hyperbranched polysiloxysilanes from A 2 (1,1,3,3-tetramethyldisiloxane) and CB 2 type monomers (methyl(vinyl)silanediylbis(oxy)bis(ethane-2,1-diyl) diacrylate and methyl(vinyl) silanediylbis(oxy)bis(ethane-2,1-diyl)bis(2-methylacrylate)) was developed in the presented paper. The polymerization was monitored using FTIR, where a two-step...
Manipulation of molecular orientation alignment in MCTLCPs (main-chain thermotropic liquid crystalline polymers) by pure shear at nano scale has been investigated for the first time using molecular dynamics (MD) simulation. Results indicate that high planar shear induces long-range uniform orientation ordering (liquid crystalline phase) of initially randomly orientated molecules of MCTLCP fluid confined...
The flow behavior of polymer melts in nanochannels by wetting actions was investigated by statistical analyses of generated polymer nanofibers' length in nanochannels of nanoporous alumina template using Scanning Electron Microscopy. The polyethylene nanofibers with high aspect ratio are formed after the infiltration of melts into the alumina nanochannels by wetting actions. The wetting of polyethylene...
A novel ultraviolet-curable polyorganosilazane ceramic precursor was synthesized via ammonolysis from modified chorosilane, which had been synthesized by alcoholysis of trichloro(methyl)silane and 2-hydroxyethyl acrylate. The polyorganosilazane was well characterized by using Fourier transformed infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance ( 1 H NMR), and multi-angle...
The regularity of ‘skin-core’ type of crystallinity distribution within the polyethylene cylindrical specimen crystallized under high pressure was investigated via modulated differential scanning calorimeter (MDSC), wide angle X-ray diffraction meter (WAXD), dynamic mechanical analyzer (DMA) and scanning electron microscope (SEM). The relationship between the gradient of high pressure stress field...
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