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RISS 인기검색어
- 검색키워드
- 저자 : Limin Zang (검색결과 3 건)
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Preparation of Functionalized Magnetic Silica Nanospheres for the Cellulase Immobilization
Wenjuan Zhang,Jianhui Qiu,Limin Zang,Eiichi Sakai,Huixia Feng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
Cellulase was immobilized on functionalized magnetic silica nanospheres using glutaraldehyde as a cross-linking agent. The morphologies, structures and magnetic properties of this immobilized cellulase were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential thermal analysis and vibrating sample magnetometry. The properties of immobilized cellulase were investigated, including the amount of immobilized cellulase and its relative activity, stability and reusability. The results indicated that immobilized cellulase exhibited better resistance to high temperature and pH inactivation in comparison to free cellulase. Moreover, immobilized cellulase with and without cross-linking agent were investigated and the former had greater amount of immobilized cellulase and better operational stability. The amount of immobilized cellulase with the cross-linking agent was 92 mg/g support. Furthermore, the activity of the immobilized cellulase was still 85.5% of the initial activity after 10 continuous uses, demonstrating the potential of this immobilized cellulase for large-scale biofuel production.
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Chanjuan Liu,Mei Mei,Limin Zang,Huanfu Zhou,Xiaohua Huang,Chun Wei 한국고분자학회 2019 Macromolecular Research Vol.27 No.3
A novel diamine monomer, 4-[4-(1-pyrrolidinyl)phenyl]-2,6-bis(4-aminophenyl) pyridine (PPAP), was synthesized using 4-(1-pyrrolidinyl)benzaldehyde as starting material, and a series of aromatic polyimides were prepared using PPAP and five aromatic dianhydrides by a two-step imidization method. The structure and properties of as-prepared polyimides were studied by Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and wide angle X-ray diffraction (WAXD). The results indicated that these polymers had good solubility in highboiling organic solvents upon heating, such as N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP). Furthermore, they had outstanding thermal properties with the glass transition temperature (Tg) exceeding 354 oC, as well as T5% and T10% mass loss temperature under a nitrogen atmosphere in the range of 521~534 oC and 544~594 oC, respectively. Moreover, they exhibited excellent hydrophobic properties with the contact angles ranging from 82.7 to 90.5°. In addition, the results of WAXD showed that these polyimides exhibited the structure of amorphous polymers.
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Xiaohua Huang,Hua Li,Chanjuan Liu,Limin Zang,Huanfu Zhou,Chun Wei 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
A novel diamine monomer 4-(4-diethylaminophenyl)-2,6-bis(4-aminophenyl)pyridine (APAP) was successfullysynthesized, and then a series of poly(pyridine imide)s was prepared from APAP with five commercial dianhydrides:pyromellitic dianhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 4,4′-oxydiphthalic anhydride(ODPA), 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), and 4,4′-(hexafluoroisopropylidene)diphthalicanhydride (6FDA) via a two-step solution polycondensation method. The structure of APAP was characterized by FT-IR,NMR, and MS. The resulting polymers have good solubility in polar solvents, such as NMP, DMF, and DMSO. Furthermore,they exhibited outstanding thermal stability. The glass transition temperature (Tg) of polymers range from 326 to 346 oC, andthe temperature at 5 % and 10 % weight loss in the range of 527 oC to 570 oC and 550 oC to 601 oC, respectively. Moreover,they also presented excellent hydrophobicity with contact angels in the range of 88.4 o to 94.0 o.
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