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Improved Properties of Aromatic Polyamide tape-casting Films

Chinese Journal of Polymer Science 2020年第12期38卷 1345-1354页

作者： Fu-Lin Liu Jjian-Jun He Hai-Xia Yang Shi-Yong Yang Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBejing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049 China

A convenient tape-casting method was applied to prepare high performance aromatic polyamide(PA)films based on Technora®.During the polycondensation,CaO was introduced to improve the solubility of the PA resin,and the generated halides were totally removed from the film via a simple water bath,without leaving any defects in PA films.The factors of processing temperature and immersion time had been systematically investigated,and the experimental results demonstrated that both of them had impressive impacts on aggregation state and comprehensive properties of the PA film.It was suggested that immersion in water for more than 1 min and baking below 300℃ for 10 min were the optimal conditions for the thermal,tensile,tear,and optical properties to be in the best equilibrium.The resultant PA films integrated outstanding film-forming ability and excellent general performance,especially the tensile property and tear resistance.

关键词： tape-casting Aromatic polyamide film Solubility Aggregation state Tensile property Tear resistance

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Electromagnetic Properties of YIG Polycrystalline Ceramics Fabricated by tape-casting Method

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Chinese Journal of Structural Chemistry 2021年第7期40卷 892-900,839页

作者：赵翀叶王贵李英魁申小飞曹智俊曹智泉文子诚袁轩一麻朝阳曹永革 Department of Physics Renmin University of ChinaBeijing 100872China Songshan Lake Materials Laboratory Dongguan 523808China University of Virginia CharlottesvilleVA 22904USA New York University New YorkNY 10003USA Institute of Physics Chinese Academy of SciencesBeijing 100190China

Pure phase Y_(3)Fe_(5)O_(12)(YIG)ceramic was successfully produced by tape-casting forming process and one-step solid-state sintering method.The activation energy for densification was calculated to be 183.81 kJ/mol.Pure YIG ceramic with a relative density as high as 99.8%was fabricated.The existence of O vacancy and Fe^(2+)ions was determined by XPS and EPR spectra.The RT saturation magnetization was measured to be 28.2 emu/g,and the hysteresis loss was calculated to be smaller than 10 mJ/kg in the temperature range of 230~360 K and be as high as 238.8 mJ/kg at 30 K.The dielectric loss tangent tanδ_(ε)was nearly zero at 6~7 GHz and 11~12 GHz.For complex permeability in the frequency range of 5~18 GHz,the magnetic loss tangent tanδ_(μ)fluctuated at around zero.Therefore,the low values of tanδ_(ε)and tanδ_(μ)indicate that it is a low loss ceramic material.

关键词： YIG ceramic tape-casting microwave hysteresis loss magnetodielectric ceramic

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