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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.cn//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.cn//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.cn//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.cn//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.cn//ss/sunpingchuan/publicationsshow_5166.html |
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Effects of Layered Lanthanum Phenylphosphonate on Flame Retardancy of Glass Fiber Reinforced Poly(Ethylene Terephthalate) Nanocomposite
Effects of layered metal phosphonate, lanthanum phenylphosphonate (LaPP) on the thermal stability, ?ame retardancy and mechanical properties of glass-?ber reinforced poly(ethylene terephthalate) (PET/GF)/microencapsulated red phosphorus (MRP) systems were investigated. The results of transmission electron microscopy (TEM) measurements indicated that LaPP particles were homogenously dispersed in PE...
http://www.polymer.cn//ss/zpfang/publicationsshow_4713.html |
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“Glass transition and disorder-to-order phase transition behavior of poly(l-lactic acid) revealed by infrared spectroscopy”
A detailed analysis of the IR spectral changes of melt-quenched poly(l-lactic acid) (PLLA) sample is presented. It is found that the glass transition, cold crystallization, disorder-to-order and melting behavior of melt-quenched PLLA can be clearly revealed by choosing suitable characteristic bands and combing the 1st derivative manipulation. Of particular note, it is found that, there are c...
http://www.polymer.cn//ss/zhangjianming/publicationsshow_3471.html |
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β-transcrystallinity developed from the novel ringed nuclei in the glass fiber/isotactic polypropylene composite
β-transcrystallinity
http://www.polymer.cn//ss/zhengguoqiang/publicationsshow_3449.html |
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Tensile Strength of Polypropylene/Glass Fiber Composites Molded by Conventional Injection Molding and Gas-assisted Injection Molding
gas-assisted injection molding
http://www.polymer.cn//ss/zhengguoqiang/publicationsshow_3443.html |
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66. Sequence Distribution Effects on Glass Transition Temperatures of Copolymers: An Extended Gibbs-DiMarzio Equation in View of Bond Rotation Flexibility
In view of bond rotation flexibility and the additivity of stiff energy, a new equation containing mole fractions of sequences and glass transition temperatures (Tg's) of periodic copolymers was proposed. Meanwhile, the effect of stereochemical sequences was also taken into account. Even for the case of all substitutions on primary (C1), second (C2), and third (C3) carbon atoms adjoining ...
http://www.polymer.cn//ss/wangwei/publicationsshow_3097.html |
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