武培怡
聚合物波谱学
个性化签名
- 姓名:武培怡
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者
- 职称:-
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学科领域:
高分子化学
- 研究兴趣:聚合物波谱学
武培怡,1968年2月出生,1985、1988年分别获南京大学理学学士和理学硕士学位,1998年获德国ESSEN大学自然科学博士学位。1998年至2000年在日本触媒研究中心从事研究。2000年9月回国工作。现任复旦大学高分子科学系系主任、教授、博导。主要研究方向为聚合物波谱学,相关工作在Macromolecules、Chemistry of Materials等SCI杂志发表论文30余篇。回国后先后入选上海市“曙光计划”和“启明星计划”,2004年度获国家杰出青年基金资助,同年入选教育部首届“新世纪人才”计划。此外,还先后4次组织了中德双边高分子研讨会。
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2233
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452
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成果数
10
武培怡, Kanyi Shen, †, ‡, Xiaohui Tian, *, Juhua Zhong, §, Jiaping Lin, Yi Shen, ‡ and Peiyi Wu*
Organometallics, Vol. 24, No.1, 2005,-0001,():
-1年11月30日
Chromium tricarbonyl complexes η6-bonded to 3-amino-9-ethylcarbazole at either the NH2-substituted aryl ring (1) or the unsubstituted aryl ring (2) have been synthesized and their UV-visible absorption spectra determined. In comparison to 2, 1 causes a subtle blue shift in the metal-to-ligand charge-transfer band along with spectral shape changes due to electron transfer from the NH2 substituent to the Cr(CO)3 center.
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武培怡, Xianneng Peng, †, Zhengzhong Shao, Xin Chen, *, ‡, David P. Knight, Peiyi Wu, † and Fritz Vollrath‡
Biomacromolecules, Vol. 6, No.1, 2005,-0001,():
-1年11月30日
We used two-dimensional (2D) correlation infrared spectroscopy to study further the potassium-induced conformation transition in Nephila spidroin films. It provided increased resolution and important new information on the sequence of events in the conformation transition process, showing that â-sheet formed from the helical component before they formed from random coil. It also showed more evidence that formation of the 1691cm-1 (turn/bend) peak did not proceed with the same kinetics as the 1620cm-1 (antiparallel â-sheet component) one, so we attribute the 1691cm-1 peak to turns which formed with different kinetics as the antiparallel β-sheets. We present a single coherent and detailed hypothesis for the assembly and secondary structural transition of silk proteins in vivo and in vitro based on our findings and on evidence from other laboratories.
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武培怡, Yi Shen, Feng'en Chen, Peiyi Wu a), Gaoquan Shi b)
J. Chem. Phys., Vol. 119, No.21, 1 December 2003,-0001,():
-1年11月30日
Raman spectra of a polythiophene film measured over a temperature range 298-98K were analyzed using generalized two-dimensional correlation spectroscopy. In the 1600-1250cm-1 region, the asynchronicity of the bands indicates the existence of different species in the investigated polythiophene sample. At least four distinct bands at 1485, 1454, 1418, and 1360cm-1 were identified. Among them, the band at 1454cm-1, attributed to the neutral species of PTh, is found to be sensitive to the temperature-induced structural changes of the polythiophene film, while the bands of the oxidized species are less sensitive to the temperature change during the cooling process.
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武培怡, Yun Peng, Peiyi Wu, a) and Yuliang Yang
J. Chem. Phys., Vol. 119, No.15, 15 October 2003,-0001,():
-1年11月30日
In this study, the diffusion process of water molecules in poly(є-caprolactone) (PCL) has been investigated using in-situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. In our system, the original broad water OH bands in 1D IR spectra can be effectively differentiated into four bands, located at 3641, 3593, 3410, and 3203cm-1, respectively, using 2D correlation analysis. The bands at 3641cm-1 (antisymmetric) and 3593cm-1 (symmetric) are assigned to the OH stretching vibration of water partially hydrogen bonded with hydrophilic carbonyl group (CvO) of PCL, while the other band pair at 3410cm-1 (antisymmetric) and 3203cm-1 (symmetric) could be attributed to the stretching vibration of water fully hydrogen bonded with another water molecule. According to the result of the asynchronous correlation, it was concluded that the water molecules at first diffuse into free volume (microvoids) or are molecularly dispersed into the PCL matrix and then form hydrogen bond with the CvO group of the polymer during the process of water diffusion. In addition, the diffusion coefficient was estimated using nonlinear curve fitting of OH band areas in the range of 3800-3000cm-1.
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【期刊论文】Variable Temperature FTIR Study of Poly(ethylene-co-vinyl alcohol)-graft-poly(є-caprolactone)
武培怡, Hongjin Jiang, Peiyi Wu, * and Yuliang Yang
Biomacromolecules, Vol. 4, No.5, 2003,-0001,():
-1年11月30日
A recently developed technique, i.e., two-dimensional infrared (2D IR) correlation spectroscopy, is used to study the thermal behavior of poly(ethylene-co-vinyl alcohol)-graft-poly(-caprolactone), a new synthesized highly grafted copolymer. The use of the 2D IR approach to analyze temperature-dependent spectra collected in situ during the temperature elevation process effectively enhanced the spectral resolution and revealed details on the hydrogen bonding and conformational change which are not easily detected in the traditional one-dimensional spectra. The sequence of the spectral changes of different OH and CH2 fundamental vibrations during heating the polymer was inferred from the signs of the asynchronous peaks. Evidence that the conformational changes of the methylene groups precede the loosening of hydrogen bonds is provided.
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武培怡, Yun Peng, † Peiyi Wu, *, † and H.W. Siesler‡
Biomacromolecules, Vol. 4, No.4, 2003,-0001,():
-1年11月30日
In the present contribution, two-dimensional ATR-FTIR spectroscopy was used to study the diffusion of water in poly(-caprolactone) (PCL). In the spectral region of the
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武培怡, P. Wu*, † and H.W. Siesler*, ‡
Chem. Mater., Vol. 15, No.14, 2003,-0001,():
-1年11月30日
The diffusion of different deuterium-labeled (OD) low-molecular-weight alcohols and D2O in Nylon 11 has been investigated by monitoring the NH/ND exchange in the polymer by Fourier transform near-infrared (FTNIR) spectroscopy. The results demonstrate that the diffusion process of the different penetrants is strongly controlled by their molecular structure and geometry. To characterize this phenomenon quantitatively, the diffusion coefficients for the different deuteration agents have been determined for Nylon 11. The rate of the diffusion was found to decrease with increasing size of alcohol. Furthermore, it could be shown that with this technique the less ordered regions of the polymer can be separated spectroscopically from the crystalline domains, which are not accessible for the isotopically labeled diffusants.
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武培怡, Yi Shen and Peiyi Wu*
J. Phys. Chem. B, Vol. 107, No.18, 2003,-0001,():
-1年11月30日
Two-dimensional (2D) correlation ATR-FTIR spectroscopy was used to study the dynamic diffusion behavior and state of water in syndiotactic polypropylene (S-PP). The 2D asynchronous spectra of water bending band clearly reveal that there are three separate bands in the 1800-1500cm-1 region. These three bands at 1676, 1645, and 1592cm-1 are assigned, respectively, to the aggregated water with strong hydrogen bond, the aggregated water with moderate strong hydrogen bond, and the "free water". On the basis of this approach, the following mechanism for the diffusion process of water in S-PP has been proposed: the aggregated water molecules first diffuse into the polymer during the diffusion process. The water molecules with strong hydrogen bond will diffuse slower than water with moderate strong hydrogen bond because of their large size. In the late stage of the diffusion process, some aggregated water molecules in the PP matrix are forced to dissolve into the "free water" form.
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武培怡, Yi Shen, ‡, Erqiang Chen, §, Chun Ye, Hailiang Zhang, Peiyi Wu, *, Isao Noda, ‖ and Qifeng Zhou§
J. Phys. Chem. B, Vol. 109, No.13, 2005,-0001,():
-1年11月30日
Two-dimensional correlation spectroscopy has been applied to study PMPCS (poly{2,5-bis[(4- methoxyphenyl)-oxycarbonyl]styrene}), a representative example of mesogen-jacketed liquid crystalline polymers. With the precise analysis of a series of Fourier transform infrared (FTIR) spectra of PMPCS recorded at varied temperatures, a reasonable mechanism of the development of liquid crystalline (LC) phase is proposed. Before the phase transition, the conformational change of individual side chains occurs sooner than that of the backbone due to the larger motional freedom of the side chains. After the phase transition, however, the readjustment of still somewhat mobile backbone occurs before the ordered, rigid, and mutually interacting side chains. That is, phase transition leading to the LC phase formation brings in a new cooperative restriction of motions to the segments.
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【期刊论文】Two-Dimensional (2D) ATR-FTIR Spectroscopic Study on Water Diffusion in Cured Epoxy Resins
武培怡, Mojun Liu, Peiyi Wu, *, Yifu Ding, Gang Chen, and Shanjun Li*, †
Macromolecules, Vol. 35, No.14, 2002,-0001,():
-1年11月30日
A novel experimental approach, based on time-resolved two-dimensional (2D) ATR-FTIR spectroscopy has been used to study water diffusion behavior of novolac epoxy resins cured with novolac resin and novolac acetate resin named as EP and EPA, respectively. The diffusion coefficients calculated by a nonlinear curve fitting are quite consistent with the results of gravimetric analysis. In 2D-IR spectra, the splitting of the water OH vibration band at 2800-3700 and 1500-1800cm-1 shows that there are two different states of water in epoxy networks, in which one could be confined into free volume (microvoids) or molecularly dispersed with less hydrogen-bonding (bulk dissolved), while the other could be attributed to bound water forming strong hydrogen-bonding with hydrophilic groups of epoxy networks. The sequential order of intensity changes of the two water bands elucidates that, in the process of water diffusion into epoxy networks, water molecules first bind with specific hydrophilic groups as bound water and then diffuse into free volume (microvoids) or molecularly dispersed with less hydrogen-bonding (bulk dissolved). The wavenumber difference of OH vibration band appearing from bound water between EP and EPA indicates that water molecules form much stronger hydrogen-bonding with EP networks than with EPA networks.
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