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- 저자 : Jianghuai Hu (검색결과 3 건)
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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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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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