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Jianghuai Hu,Gang Yang,Junwei Zhang,Yun Zou,Ke Zeng 한국고분자학회 2014 Macromolecular Research Vol.22 No.10
Approaches to promote the post-cure reaction of polyimide with pendant phthalonitrile unit (CN-PI) werefirst realized by introducing of hydroxyl groups via chemical copolymerization or physical blending. The post-curereaction of the CN-PI was performed at 250 or 300 oC, and monitored by various techniques, such as infrared spectroscopy(IR), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), scanning electronmicroscopy (SEM), and thermogravimetric analysis (TGA). A significant result was found in that the trend of theincreasing glass transition temperature Tg with nitrile conversion followed DiBenedetto’s equation. This provided achance to deeply discuss the relationship between molecular structure, segmental mobility, and cure behavior of CNPI. Chemical structure changes and morphology evolution of the polymer during post-cure process were investigatedby IR, WAXD, and SEM. The thermal and mechanical properties of polymer films showed it to be a thermallystable and strong material.
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Zhiping Wang,Jianghuai Hu,Ke Zeng,Gang Yang 한국고분자학회 2017 폴리머 Vol.41 No.5
An adenine-containing curing agent, 9,10-bis(4-aminophenyl) adenine (p-APA) was designed to decrease the volatility of curing agent. The exact structure of p-APA was confirmed by proton nuclear magnetic resonance (1H NMR), infrared spectroscopy (IR) and elementary analyzer (EA). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were measured to compare volatility of p-APA with that of a traditional curing agent, 1,3-bis(4-aminophenoxy) benzene (4-APB), which indicated p-APA has better thermal stability and lower volatility. The thermal tests of different curing process of phthalonitriles showed good thermal and thermo-oxidative stabilities. The thermal property was improved along with increasing curing temperature and time and the glass-transition temperature (Tg) was not observed on DSC before 400℃. The Fourier transform infrared spectroscopy (FTIR) showed that triazine and phthalocyazine rings were the dominant reaction products of the cured phthalonitriles. The dynamic mechanical analysis (DMA) of post-cured phthalonitriles showed a storage modulus of 1.3 GPa at 40℃ and Tg about 500℃.
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Fei Wu,Xiaoting Xiao,Qian Liu,Jianghuai Tong 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
This paper focuses on comparing the quasi-static crushing mechanical behaviour and energy absorption characteristics of four types of interlayer tubes formed by combining mesh tube and 304 tube with two diff erent interface matching methods (tight fi t and metallurgical bonding). The deformations and energy absorptions of interlayer tubes are still dominated by 304 tube. The mesh tube and metallurgical points are able to induce and improve the deformation of 304 tube by changing its axial crushing stress state, thus, aff ecting the shapes and quantities of its folds, changing its deformation behaviours and modes, and fi nally forming interlayer tubes with diff erent mechanical behaviours and energy absorption characteristics. The tight fi t interlayer tubes exhibit better mechanical behaviour and energy absorption compared with the hollow 304 tube. The sintering interlayer tubes matching by metallurgical bonding can further improve the mechanical behaviours and energy absorptions of interlayer tubes and present more stable crushing deformations and stronger bearing capacities. It is an eff ective method to improve the mechanical behaviours and energy absorption characteristics of interlayer tubes by changing interface matching modes.
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Optimization of Wavefront Coding Phase Mask Applied to 5X-40X Micro-Objectives Simultaneously
Jiang Liu,Erlong Miao,Yongxin Sui,Jianghuai Yang 한국광학회 2015 Current Optics and Photonics Vol.19 No.5
A wavefront coding (WFC) technique provides an extension of the depth of field for a microscopyimaging system with slight loss of image spatial resolution. Through the analysis of the relationship betweenthe incidence angle of light at the phase mask and the system pupil function, a mixing symmetrical cubicphase mask (CPM) applied to 5X-40X micro-objectives is optimized simultaneously based on point-spreadfunction (PSF) invariance and nonzero mean values of the modulation transfer function (MTF) near thespatial cut-off frequency. Optimization results of the CPM show that the depth of field of thesemicro-objectives is extended 3-10 times respectively while keeping their resolution. Further imagingsimulations also prove its ability in enhancing the defocus imaging
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Qi Bian,Ke Zeng,Kai Qiu,Jiaojian Liu,Yancun Niu,Yancui Liu,Jianghuai Hu,Gang Yang 한국고분자학회 2015 Macromolecular Research Vol.23 No.7
Solid vinyl monomer with functional group “phthalonitrile” was successfully introduced into microspheres to make poly{styene-co-4-(4-vinylphenoxy) phthalonitrile} microspheres (PSPMs) with uniform (UPSPMs) and core-shell (core-shell PSPMs) structure using soap-free emulsion polymerization by the new approach of “codissolution”. The core-shell PSPMs then were used as the design platform to make metallophthalocyanine-containing microspheres. EA, FTIR, SEM, TEM, UV-vis, TGA, XPS, solid 1H NMR and XRD techniques were employed to analyze the formation and morphology of PSPMs and metallophthalocyanine-containing microspheres. The results showed that UPSPMs and core-shell PSPMs were both realized and they were regular sphericities with diameters of around 370 nm. The percentages of reacting weight of 4-(4-vinylphenoxy) phthalonitrile were close to 50%. Based on the design platform of core-shell PSPMs, metallophthalocyanine-containing microspheres could be obtained and the content of metallophthalocyanine was close to 19%.
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Chen Junhui,Liu Yangqing,Ma Guangqiang,Yang Feiying,Zhan Zhigao,Guan Limei,Kuang Wendong,Wang Jinchang,Li Jianghuai,Han Fei,Jin Liang 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
Mosquitoes bite human beings and transmit many diseases, such as malaria, dengue fever, and Zika virus. Vector control of mosquitoes is an effective strategy for reducing the spread of disease. However, extensive use of in secticides (e.g. pyrethroids and organophosphorus) has caused resistance in mosquitoes, which weakens the effectiveness of mosquito control. Phytochemicals have been considered an alternative approach to mosquito control. Essential oil (EO) was obtained from the leaves and flowers of Origanum vulgare, and its synergistic activity with piperonyl butoxide (PBO) was tested against Aedes albopictus and Culex pipiens quinquefasciatus larvae. Thirty-seven compounds were identified, among which carvacrol and thymol were two major constitu ents (30.73 % and 18.81 %, respectively). O. vulgare EO had a significant toxic effect against fourth-stage larvae of Cx. p. quinquefasciatus and Ae. albopictus, with LC 50 values of 17.51 and 75.90 mg/L. Carvacrol and thymol also each appeared to be more effective against Cx. p. quinquefasciatus (LC 50 = 19.30 and 11.56 mg/L, respectively) than Ae. albopictus (LC 50 = 26.62 and 26.66 mg/L, respectively). PBO interacted synergistically with O. vulgare EO, carvacrol and thymol with 2.60–6.26 times as much of the active compound needed without PBO as against Cx. p. quinquefasciatus and Ae. albopictus larvae. Overall, our results contribute to the development of new natural mosquito insecticides.
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