Dalian University of Technology

Wu Xiao

Gaohong He

Xiaobin Jiang

Xiangcun Li

Xuemei Wu

Xiaoming Yan

Xuehua Ruan

Yan Dai

Weixiang Fan

Wenji Zheng

Jiaming Wang

Qinzheng He

Xiaozhou Wang

Fujun Cui

Tiantian Li

Wanting Chen

Jin Li

Mingguang Han

Dapeng Lu

Linghan Tuo

Guannan Li

A fabrication technique for PIM-1 asymmetric membranes doped with polyethylene glycol for gas separation includes the following steps. Firstly, the coagulation process of casting solution is regulated by polyethylene glycol to thin the dense layer, to improve the hydrophilicity of the membrane structure, and to form mass transfer channels for the diffusion of polyethylene glycol into the dense layer. Then, directional migration and enrichment of polyethylene glycol are realized through capillary action induced by directional water evaporation for fabrication of PIM-1 asymmetric membranes doped with polyethylene glycol in the dense layer for gas separation.

Large-scale fabrication technique for PIM-1 asymmetric membranes doped with low-molecular-weight polyethylene glycol for gas separation

The present invention belongs to the field of alkaline polymer electrolyte membranes, and relates to a comb-shaped structure polybenzimidazole anion exchange membrane with high conductivity and preparation method thereof. In the invention, firstly, polybenzimidazole is grafted with the non-cationic side chains to the max grafting rate to synthesize the de-protonated comb-shaped polybenzimidazole material, avoiding the N—H in benzimidazole forms ionic binding with cationic functional groups, which will reduce the reactivity and mobility of cationic groups; then react de-protonated comb-shaped polybenzimidazole with quaternization reagent to attach the pendent side chain with cationic functional groups, making it easy to aggregate to form ion clusters and hydrophilic/hydrophobic microphase separation. The anion exchange membrane prepared in this invention has excellent conductivity, mechanical properties and alkaline stability.

Comb-shaped structure polybenzimidazole anion exchange membrane with high conductivity and preparation method thereof

An experiment system and method for accurate controlling of macromolecular crystallization process. The system has a platform-equipped horizontal moving slot and channel dedicated backwash module, a droplet adding control module, an observing module, a user observation computer system, and an experimental condition control module. A high-precision movement knob of the x-axis platform and the y-axis platform of the system and the accurate position control of a syringe needle are used to ensure that the macromolecular solution can be added into the correct positions of convex or concave. The crystallization induction period of the target crystal form is determined by the real-time data of the high-speed microcamera, and the crystal cultivation environment is adjusted in real time. This is simple and easy to operate, high in productivity, can be applied to the conventional experimental replication.

Experiment system and method for accurate controlling of macromolecular crystallization process

The present invention provides a continuous crystallization method under control of the multistage membrane modules, and belongs to the technical field of crystallization engineering. A crystallization solution is added to a crystallizer, and a stirring apparatus and a temperature control apparatus are started. After the system running stability, the loop of crystallization is started. Meanwhile, the coolant or antisolvent feed liquid loop is also started. The crystallization solution can respectively conduct crystal nucleation, growth and ripening in the multistage membrane modules, and then the crystallization solution is transported into a filter device and a drying apparatus to obtain the final crystal products. The desired crystal products can be obtained by the systematical control of the nucleation and crystal growth through the flow and the temperature of the crystallization solution, coolant or antisolvent feed liquid, and the contact time between two liquid phases.

Continuous crystallization method under control of multistage membrane

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Dalian, China

Wu Xiao