http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Baojiao Gao (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Baojiao Gao,Wei Zhang,Qingjuan Lei,Jiying Men 한국고분자학회 2013 Macromolecular Research Vol.21 No.6
8-Hydroxyquinoline aluminum complex-attached polysulfone was prepared via a polymer reaction and a coordination reaction, namely 8-hydroxyquinoline aluminum functionalization of polysulfone (PSF) was realized. 5-chloromethyl-8-hydroxyquinoline (CHQ) was first prepared through the chloromethylation reaction between 8-hydroxyquinoline (HQ) and chloromethylation reagent 1,4-bichloromethoxy-butane (BCMB). A polymer reaction,Friedel-Crafts alkylation reaction, was carried out between PSF and CHQ in the presence of Lewis catalyst SnCl4,and HQ was bonded onto the side chains of PSF, obtaining the modified polysulfone HQ-PSF. Then, the coordination reaction between HQ-PSF and 8-hydroxyquinoline aluminum complex AlQ2, which had two HQ ligands, was conducted, and the luminescence material AlQ3-PSF, in whose molecular structure 8-hydroxyquinoline aluminum complex AlQ3 is attached chemically onto the side chains of PSF, was achieved, namely, the AlQ3-containing PSF was successfully prepared. The chemical structures of HQ-PSF and AlQ3-PSF were fully characterized by FTIR, 1H NMR and the UV/vis absorption spectrum, and the luminescence performance of AlQ3-PSF was initially examined. In this work, the 8-hydroxyquinoline functionalization process of PSF was mainly investigated. The effects of the key factors on the Friedel-Crafts alkylation reaction, which occurs on the side chains of PSF macromolecules, were mainly researched, and the reaction mechanism was explored. The experimental results show that the Friedel-Crafts alkylation reaction between PSF and CHQ can proceed smoothly, and the suitable reaction conditions are as follows: a temperature of 70 oC, with N,N-dimethylformamide (DMF) as solvent, and using SnCl4 as a Lewis catalyst. The AlQ3-containing polysulfone, AlQ3-PSF, possesses the fluorescence-emission spectrum of AlQ3, and its luminescence performance is nearly identical with AlQ3 under the same concentration condition of the AlQ3 unit.
-
Baojiao Gao,Jian Meng,Yang Xu,Yongqi Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
For the purification of lanthanide, Fe3+ ion surface-imprinted material was prepared with sodium pstyrenesulfonate (SSS) as functional monomer and using a novel ion surface-imprinting technique of ‘‘synchronously graft polymerizing and imprinting’’. In solution, the anionic monomers SSS are distributed around template Fe3+ ion by right of ion exchange action. The graft/cross-linking copolymerization of SSS and crosslinker N,N0-methylenebisacrylamide (MBA) on SiO2 particles was initiated by a surface initiating system, obtaining Fe3+ ion surface-imprinted material IIP-PSSS/SiO2. It possesses special recognition selectivity for Fe3+ ion, and its selectivity coefficients for Fe3+ ion are 5.77 relative to La3+ ion and 5.69 relative to Pr3+ ion, respectively.
-
Yanbin Li,Baojiao Gao,Tao Chen,Zongwen Qiao 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
By using a novel molecular surface-imprinting technique, “synchronously graft-polymerizing and imprinting”method established by our group, a pesticide molecule surface-imprinted material was prepared successfully forthe removal of pesticide residues from water. The micron-sized silica gel particles were first surface-modified withcoupling agent γ-aminopropyltrimethoxysilane (AMPS), obtaining the modified particles AMPS-SiO2, onto whosesurfaces primary amino groups were introduced. The anionic monomer sodium p-styrenesulfonate (SSS) was used asfunctional monomer and N,N'-methylenebisacrylamide (MBA) was used as crosslinker. In aqueous solution, the monomermolecules were arranged around the template molecule, atrazine molecule that is an extensively used herbicide,through electrostatic interaction. By initiating of the redox surface-initiating system of -NH2/S2O82−, the graft/crosslinkingpolymerization of SSS on SiO2 particles and the surface imprinting of atrazine molecule were simultaneouslycarried out, forming atrazine molecule surface-imprinted material MIP-PSSS/SiO2. With propoxur and pirimicarb, whichare also two pesticides as two contrast substances, the recognition performance of the atrazine molecule surface-imprintedmaterial MIP-PSSS/SiO2 was investigated in depth. The experimental results show that MIP-PSSS/SiO2 particles possessspecial recognition selectivity and excellent binding affinity for atrazine. The binding capacity of atrazine on MIPPSSS/SiO2 particles can get up to 61 mg/g, and relative to propoxur and pirimicarb, the selectivity coefficients of MIPPSSS/SiO2 for atrazine are 9.69 and 8.79, respectively.
-
Jiying Men,Ruixin Wang,Xiaoyu Hu,Hongyu Zhao,Hongwei Wei,Cong Hu,Baojiao Gao 한국고분자학회 2016 Macromolecular Research Vol.24 No.2
In suspension polymerization system, poly(glycidyl methacrylate) (PGMA) microspheres are firstly prepared. Then, ring opening reaction takes place when heparin is bonded on PGMA microspheres to obtain functional PGMA-heparin microspheres. The chemical structure and physicochemical characters of PGMA-heparin microspheres are fully characterized with infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and zeta potential determination. The adsorption properties of PGMA-heparin for lysozyme are mainly investigated. The effects of the main factors on the adsorption properties are explored, furthermore the adsorption mechanism is analyzed in depth, and the adsorption thermodynamics is also researched. The experimental results show that the strong electrostatic interaction is formed between high density of negative charge coming from the carboxyl groups or sulfonic acid groups of heparin and the positive charge of basic protein lysozyme. The adsorption of PGMA-heparin for lysozyme is dependent on the pH value of the medium, and the saturated adsorption amount of PGMA-heparin for lysozyme possesses a maximum at pH 8, which reaches up to 654 mg/g. The adsorption of PGMA-heparin for lysozyme is an exothermic process which is driven by entropy, and the adsorption amount decreases with increasing the temperature.
-
Jiying Men,Jianfeng Guo,Weihong Zhou,Nanyan Dong,Xilun Pang,Baojiao Gao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Ion-exchange is a widely used purification technology in the heparin manufacturing process. To improve the rate and efficiency, the cationic monomer Acryloxyethyltrimethyl ammonium chloride (DAC) was grafted on silica gel particles by using a surface-initiated graft-polymerization technique, and a novel adsorption polymer of PDAC/SiO2 was prepared. The adsorption experiments of PDAC/SiO2 for heparin show that there are strong electrostatic interactions between heparin with a high density of negative charges and PDAC/SiO2 that exists in many quaternary ammonium cations. Comparing the adsorption kinetics of PDAC/SiO2 with D201 anionic strong alkali exchange resin, PDAC/SiO2 shows higher adsorption capacity and faster adsorption rate. The pH and temperature of solutions have a great influence on the adsorption amount, and there is a maximum adsorption capacity of 121mg/g when pH=7 at 25 oC. The adsorption of PDAC/SiO2 for heparin is an exothermic process and driven by entropy.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
