作者：
Po-Chin NienJen-Yuan WangPo-Yen ChenLin-Chi ChenKuo-Chuan HoDepartment of Chemical Engineering
National Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipei10617 Taiwan Institute of Polymer Science and EngineeringNational Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipei10617 Taiwan Department of Bio-Industrial Mechatronics EngineeringNational Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipei10617 Taiwan Department of Chemical EngineeringNational Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipei10617 Taiwan Institute of Polymer Science and Engineering
National Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipei10617 Taiwan
Well-defined star-shaped poly(L-lactide)with six arms(sPLLA)was synthesized via the ring-opening polymerization of L-lactide using dipentaerythritol as initiator and stannous octoate as catalyst in bulk at 125~*** eff...
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Well-defined star-shaped poly(L-lactide)with six arms(sPLLA)was synthesized via the ring-opening polymerization of L-lactide using dipentaerythritol as initiator and stannous octoate as catalyst in bulk at 125~*** effects of molar ratios of both monomer to initiator and monomer to catalyst on the molecular weights of as-synthesized sPLLA polymers were in detail *** molecular weights of sPLLA polymers linearly increased with the molar ratio of monomer to initiator,and the molecular weight dist...
A new method is presented for quantitative determination of naltrexone in aqueous solutions based up on the wavelength selection in mid-FTIR spectra using partial least squares (PLS) technique. The main aim is to find...
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The University of California has recently funded a new Lead Campus program: Research and Education in Green Materials, a multi-campus graduate fellowship program designed to bridge the disciplinary boundaries of engin...
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ISBN:
(纸本)9781424443246
The University of California has recently funded a new Lead Campus program: Research and Education in Green Materials, a multi-campus graduate fellowship program designed to bridge the disciplinary boundaries of engineering, science, toxicology and social science. This paper describes the program and the graduate course on green engineering.
To improve the processability of polyimide (PI), taking p-amino-phenol and dimethyl dichlorosilane as raw materials, an activated monomer of bis(p-aminophenoxy) dimethylsilane (APMSI) containing silicon was prepared. ...
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To improve the processability of polyimide (PI), taking p-amino-phenol and dimethyl dichlorosilane as raw materials, an activated monomer of bis(p-aminophenoxy) dimethylsilane (APMSI) containing silicon was prepared. Then the silicone-containing PI was synthesized from APMSI, pyromellitic dianhydride (PMDA) and 4, 4'-oxydianilline (ODA) with different contents in N, N'-dimethylacetamide (DMAC). The structure of p-acetaminophenol and APMSI was characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (1H NMR and 13C NMR) and melting point apparatus, and the total yield of APMSI was 67%. The construction, thermal property and solution property of pure PI and silicone-containing PI were characterized by FTIR, differential thermal analyzer (DTA), thermo-gravimetric analyzer (TGA) and solution experiment, respectively. Results illustrate that compared with the pure PI, the silicone-containing PI has lower heat resistance and highly improved dissolubility, and its heat resistance becomes higher with the increasing content of activated monomer containing silicon, while its glass transition temperature is decreased greatly.
作者：
H.Y.ParkD.H.ParkK.D.KangS.M.ShinS.S.KimI.R.JeonK.R.HaK.H.SeoDepartment of Polymer Science
Kyungpook National UniversityDaeguKorea R&D Center
Pyungwha Oilseal Industry Co.Ltd.DaeguKorea Advance Materials DivisionKorea Research Institute of Chemical TechnologyDaejeonKorea Department of Industrial ChemistryKyungil UniversityDaeguKorea Department of Chemical EngineeringKeimyung UniversityDaeguKorea
From Aug. 12 to 15 at Galaxy Hotel, Shanghai, more than 100 scientists and graduate students from macromolecular phy-sics, engineering and chemistry met together in the Interna-tional Discussion Meeting of polymer Cry...
From Aug. 12 to 15 at Galaxy Hotel, Shanghai, more than 100 scientists and graduate students from macromolecular phy-sics, engineering and chemistry met together in the Interna-tional Discussion Meeting of polymer Crystallization (IDMPC). The participants were coming from China, Japan, United States, Germany, England, France, Netherlands, Italy, Korea and Canada. The meeting was initiated by the Ministry of Education of China and European Physical Society, sponsored by the National Natural science Foundation of China and Donghua University, and organized by the State Key Laboratory for Modification of chemical Fibers and chemical Materials.
Novel polypyrrole (PPy) hollow micrometer-sized Y-junctions and capsules were selectively prepared via in-situ polymerization. The rod junctions or particles of benzyl orange (BO) precipitates were used as reactive te...
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Novel polypyrrole (PPy) hollow micrometer-sized Y-junctions and capsules were selectively prepared via in-situ polymerization. The rod junctions or particles of benzyl orange (BO) precipitates were used as reactive templates which were obtained by adding HCl or FeCl3 to BO aqueous solution, respectively. PPy formed on the surface of the templates and the templates could be removed easily by routine washing with water for BO-HCl or by direct self-degradation for BO-FeCl3. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results showed that, the PPy hollow Y-junctions and capsules with morphologies similar to those of templates were obtained after templates removal. The effects of pH, the speed of the oxidant addition and the reaction temperature on morphology of the PPy microstructures were investigated and the special hollow structures could be observed always under the appropriate conditions. It was found that more PPy Y-junctions or capsules were obtained when the polymerization rate was decreased either by controlling the speed of oxidant addition or the reaction temperature, implying that the formation of PPy micro/nanostructures by this BO template method is a relatively slow process. Moreover, the structure and property of the PPy microstructures have been characterized by Fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD) techniques and electric conductivity measurements.
Three novel nonlinear chromophores with symmetric D-π-D molecular structure and extended conjugated length were synthesized. Solvatochromism analysis shows great symmetric intramolecular charge transfer occurring in ...
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Three novel nonlinear chromophores with symmetric D-π-D molecular structure and extended conjugated length were synthesized. Solvatochromism analysis shows great symmetric intramolecular charge transfer occurring in chromophores by the enhancement in the dipole moment between the ground and excited states. The properties of optical power limiting induced by three-photon absorption （3PA） are demonstrated. Large 3PA coefficients and the corresponding molecular cross sections as high as 10^-74 cm^6s^2 were obtained for nanosecond laser pulses at 1.06μm from nonlinear transmission measurements.
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