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014. Glass transition in single poly(ethylene oxide) chain: A molecular dynamics simulation study
Local dynamics of single poly(ethylene oxide) chain in various environments (bulk, film, and isolated systems) has been characterized by the reorientation functions of various backbone bond vectors. Within any observation time, the variations of these reorientation functions with the temperature can be well described by the Kohlrausch-Williams-Watts (KWW) like equation, in which the fitted tempe...
http://www.polymer.cnt//ss/wuchaofu/publicationsshow_9827.html |
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Probing the Two-Stage Transition upon Crossing the Glass Transition of Polystyrene by Solid-State NMR
A two-stage transition upon crossing the glass transition of polystyrene with increasing temperature was precisely determined and
interpreted by using solid-state nuclear magnetic resonance (SSNMR), 1H-1H dipolar couplings based Double
Quantum-Filtered (DQF) and dipolar filter (DF) experiment and 13C
Chemical Shift Anisotropy (CSA) based centerband-only detection of exchange (CODEX) experiment ar...
http://www.polymer.cnt//ss/sunpingchuan/publicationsshow_9032.html |
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Well-defined high refractive index poly(monothiocarbonate) with tunable Abbe''s numbers and glass-transition temperatures via terpolymerization
The synthesis of thermoplastics with high refractive index (n) and high Abbe’s number (Vd) is rarely reported. This work describes well-controlled synthesis of a soluble poly(monothiocarbonate) with high n and Vd values by using carbonyl sulfide (COS) as sulfur resource. The alternating COS/cyclohexene oxide (CHO)/propylene oxide (PO) terpolymerization was well performed by using...
http://www.polymer.cnt//ss/xhzhang/publicationsshow_8493.html |
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Colloidal particles with various glass transition temperatures: preparation, assembly, and the properties of stop bands under heat treatment
Monodisperse P(St-co-nBA-co-AA) colloidal microspheres with various glass transition temperatures (T gs), whose average particle sizes were about 300 nm, were prepared using soap-free emulsion polymerization by adjusting the ratio of styrene and n-butyl acrylate. Colloidal photonic crystals were assembled with these microspheres by vertical deposition method. Stop bands of colloid...
http://www.polymer.cnt//ss/zhangqiuyu/publicationsshow_7794.html |
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Scalable preparation of multiscale carbon nanotube/glass fiber reinforcements and their application in polymer composites
The introduction of carbon nanotubes (CNTs) into conventional fiber
to construct a hierarchical structure in polymer composites has attracted great
interest owing to their merits of performance improvement and multiple
functionalities. However, there is a challenge for realizing the scalable preparation
of the multi-scale CNT-glass fiber (CNT-GF) reinforcements in practical
application. In this wo...
http://www.polymer.cnt//ss/tanglongcheng/publicationsshow_7775.html |
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GLASS TRANSITION BEHAVIOR OF THE SPIN-COATED THIN FILMS OF A HYDROPHILIC POLYMER ON THE SUPPORTED SUBSTRATES
Using ellipsometry, we found the glass transition temperature of the spin-coated polyacrylamide (PAL) thin films on the supported silicon (Si) substrates with an oxide layer decreases with decreasing the film thickness. But Tgs of the as-prepared thin films are much higher than that of the bulk sample. Such observations may be attributed to the combined result of the “surface effect” and...
http://www.polymer.cnt//ss/cenglxl/publicationsshow_7530.html |
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β-crystal formation of isotactic polypropylene under the combined effects of acid-corroded glass fiber and preshear
The acid-corroded glass fiber (GF)/isotactic polypropylene
(iPP) composite was injection molded by mixing–
injection molding (MIM). Through this method,
preshear can be imposed on melt during mix–plasticization
process. The crystalline structure across the
thickness direction of the injection-molded bars was
investigated by wide-angle X-ray diffraction and differential
scanning calo...
http://www.polymer.cnt//ss/zhengguoqiang/publicationsshow_7079.html |
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Synthesis of cerium phenylphosphonate and its synergistic flame retardant effect with decabromodiphenyl oxide in glass-fiber reinforced poly(ethylene terephthalate)
A lamellar cerium phenylphosphonate (CeHPP) was synthetized through reflux method and it was combined with decabromodiphenyl oxide (DBDPO) to prepare flame retarded poly(ethylene terephthalate) (PET) nanocomposites. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that CeHPP was a one-dimensional nanocrystal with the interlamellar distance of 1.57 nm. Thermogravimetric analysi...
http://www.polymer.cnt//ss/zpfang/publicationsshow_6867.html |
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Prediction of glass transition temperatures for polystyrenes from cyclic dimer structures using artificial neural networks
The quantitative structure-property relationship (QSPR) was studied for the prediction of glass transition temperatures of polystyrenes on a set of 107 polystyrenes using artificial neural networks combined with genetic function approximation. Descriptors of the polymers were derived from their corresponding cyclic dimer structures. A nonlinear model with four descriptors was developed with square...
http://www.polymer.cnt//ss/xujie/publicationsshow_5331.html |
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UNIQUE EVOLUTION OF SPATIAL AND DYNAMIC HETEROGENEITY ON THE GLASS TRANSITION BEHAVIOR OF PVPh/PEO BLENDS
Glass transition behavior of hydrogen bonded polymer blends of poly(vinyl phenol) (PVPh) and poly(ethylene oxide) (PEO) is systematically investigated using normal differential scanning calorimetry (DSC) and recently developed multifrequency temperature-modulated DSC (TOPEM), in combination with Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) techniques, focusin...
http://www.polymer.cnt//ss/sunpingchuan/publicationsshow_5166.html |
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