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SYNTHESIS AND CHARACTERIZATION OF AMINO FUNCTIONALIZED LADDER-LIKE POLYSILSESQUIOXANES AND THEIR HYBRID FILMS WITH polyimide

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Chinese Journal of Polymer Science 2013年第3期31卷 427-433页

作者： Qiu-shuang Gao Guo-feng Tian Sheng-li Qi Zhan-peng Wu 武德珍 State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Ladder-like polysilsesquioxanes （LPSQs） with different amino contents have been synthesized by controlling of the dosage of Pd/C catalyst. The concentration and activity of amino groups were investigated by Fourier transform infrared spectroscopy. polyimide.（PI）/LPSQ hybrid films have been prepared by incorporating of the obtained LPSQs with different amino contents into PI matrix, respectively. The interfacial interactions between PI matrix and LPSQ were studied with scanning electron microscopy and X-ray photoelectron spectroscopy, meanwhile the thermal and mechanical properties of the hybrid films were studied using dynamic mechanical analysis and tensile tests. The results indicate that the functionality of LPSQ has great effects on the interfacial interactions and the properties of hybrid films. With the increase of amino content, both the interracial interactions and the cross-linking density of hybrids enhanced, which results in the decline of surface silicon concentration, increase of Young＇s modulus and drop of elongation at break. Excessive amino content makes the hybrid films brittle and leads to incomplete imidization.

关键词： Organic-inorganic Hybrid Amino functionalized ladder-like polysilsesquioxane polyimide.

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Catalysis and Inhibition of Benzimidazole Units on Thermal Imidization of Poly(amic acid) via Hydrogen Bonding Interactions

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Chinese Journal of Polymer Science 2015年第4期33卷 621-632页

作者： Hui-na Wang Ming-xi Yang Long-bo Luo Jie-yang Huang Ke Li Xu Wang Yan Feng 刘向阳 State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan University

The effect of benzimidazole units on thermal imidizaiton was studied when they were introduced into the main chain of poly（amic acid）（PAA）. The thermal imidization process of PAA-PABZ synthesized by 3,3＇,4,4＇- biphenyltetracarboxylic dianhydride （BPDA） and 2-（4-aminophenyl）-5（6）-aminobenzimidazole （PABZ） was studied by TGA, DSC, DMA, FTIR and in situ FTIR. The results of FTIR and in situ FTIR indicate benzimidazole units act as an ＂in situ＂ catalyst to accelerate thermal imidization of PAA to polyimide.（PI） when the temperature is lower than 170℃. FTIR and ~H-NMR results demonstrate that in situ catalysis is caused by the hydrogen bonding interactions between C=N of benzimidazole and -NH- in -CONH- of PAA and the semi-ionization of the H in imidazole ring of benzimidazole. However, when the imidization temperature is higher than 170℃, the thermal imidization process is inhibited. DMA and in situ FTIR results illustrate that the decreased mobility of PI-PABZ macromolecular chains and the reduced reactive ability of anhydride formed during the intramolecular breakdown of polymer chains lead to the inhibition of thermal imidization process.

关键词： Benzimidazole Hydrogen bonding Catalysis Inhibition polyimide.

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Synthesis and Characterization of Ion-exchange Copolyimide

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Chinese Chemical Letters 2004年第1期15卷 17-18页

作者： LiRongZHANG ChunQingZHANG YanGAO ZhiYuanJIA DepartmentofPolymerScience＆Materials DalianUniversityofTechnologyDalian116012

A new diamine, disodium 4, 4-di(4-aminophenoxy)-3, 3-disulfonate-1, 1- diphenyl- ketone, was prepared from the nucleophilic substitution of disodium 4, 4- difluoro-3, 3-di- sulfonate-1, 1-diphenylketone and p-aminophenol. Polymerization of this diamine and 4, 4-diamino-1, 1- diphenyl ether with 3, 3, 4, 4-tetracarboxyl dianhydride-1, 1- diphenyl ketone gave ion-exchange copolyimide. The new diamine and its polyimide.were characterized with 1H-NMR and FT-IR.

关键词： Diamine ion-exchange polymer polyimide.

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