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“Effect of Solvent Evaporation Rate on Order-to-Disorder Phase Transition Behavior of Regioregular Poly(3-butylthiophene)”
The effect of solvent evaporation rate on the crystal modification and the thermal stability of solution cast regioregular poly(3-butylthiophene) (P3BT) film was investigated by WAXD, DSC, and FTIR. It is found that, independent of the solvent evaporation rates, the P3BT films prepared from chloroform solution demonstrate essentially the same interlayer distance, which is very close to the reporte...
http://www.polymer.cn//ss/zhangjianming/publicationsshow_3480.html |
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“Polymorphism and Structural Transition around 54 ?C in Regio-regular Poly(3-hexylthiophene) with High Crystallinity as Revealed by Infrared Spectroscopy”
Poly(3-hexyllthiophene) (P3HT) with high crystallinity was prepared by controlling the solvent evaporation rate together with the aid of chloroform vapor annealing. According to the infrared spectroscopy combined with the thermal analysis and the X-ray diffraction (XRD) data, a new crystal modification named as form I′ was identified for P3HT sample crystallized under extremely slow evaporat...
http://www.polymer.cn//ss/zhangjianming/publicationsshow_3479.html |
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“Study on the Phase Transition Behavior of Poly(butylene adipate) in its Blends with Poly(vinyl phenol)”
The phase transition behavior of poly(butylene adipate) (PBA) crystals in its blends with poly(vinyl phenol) (PVPh) was investigated by infrared (IR) spectroscopy and X-ray diffraction (XRD). The IR and XRD studies indicate that the hydrogen bonding between the C═O group of PBA and the OH group of PVPh developed in the PBA/PVPh blends with the ratios of 80/20 and 50/50 does not influence the solu...
http://www.polymer.cn//ss/zhangjianming/publicationsshow_3475.html |
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“PLLA Mesophase and Its Phase Transition Behavior in the PLLA-PEG-PLLA Copolymer As Revealed by Infrared Spectroscopy”
A detailed analysis of the IR spectrum of melt-quenched PLLA−PEG−PLLA sample and its change with temperature is presented. It was found that, in the initial state of the melt-quenched PLLA−PEG−PLLA sample, the PLLA constituent does not exist as a normal amorphous or crystalline phase but as a kind of mesophase, which is confirmed by the WAXD data. The IR data suggest that b...
http://www.polymer.cn//ss/zhangjianming/publicationsshow_3473.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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54. Layered Structure and Order-to-Disorder Transition in a Block Codendrimer Caused by Intermolecular Hydrogen Bonds
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http://www.polymer.cn//ss/wangwei/publicationsshow_3085.html |
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General Synthesis and Delamination of Highly Crystalline Transition Metal Bearing Layered Double Hydroxides
In this paper, we describe a general process for the synthesis and delamination of a family of highly crystalline Al-based and transition-metal-bearing layered double hydroxides (LDHs).
http://www.polymer.cn//ss/liuzhaoping/publicationsshow_2845.html |
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Predicting the Effect of Dissolved Carbon Dioxide on the Glass Transition Temperature of Poly(Acrylic Acid)
The morphology and size of poly(acrylic acid) (PAA) particles produced by precipitation polymerization in supercritical CO2 (scCO2) depends on the glass transition temperature (Tg) of the polymer at reaction conditions. In this study, the use of the Sanchez–Lacombe equation of state (SL-EOS), in conjunction with Chow's equation, to predict the effect of CO2 pressure on the Tg of PAA was eval...
http://www.polymer.cn//ss/caoguiping/publicationsshow_2813.html |
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Abnormal current– voltage characteristics and metal– insulator transition of amorphous Fe-doped carbon films on Si substrates
Amorphous Fe0.05–C0.95 films have been deposited on n-type Si substrates using direct current magnetron sputtering. The structure and electrical properties of the films/Si are investigated. The film/Si deposited at room temperature exhibits abnormal current–voltage (I–V) characteristics, whose current
increases slowly at first, and then increases to a very large value when the v...
http://www.polymer.cn//ss/xueqingzhong/publicationsshow_2667.html |
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Abnormal current–voltage characteristics and metal–insulator transition of amorphous carbon film/silicon heterojunction
The amorphous carbon film/n-Si (a-C/n-Si) heterojunctions have been fabricated by direct current magnetron sputtering at room temperature, and their current–voltage characteristics have been investigated. The results show that these junctions have good rectifying properties in the temperature range 80–300 K. The interesting result is that the current–voltage curve changes dramati...
http://www.polymer.cn//ss/xueqingzhong/publicationsshow_2664.html |
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