Polysiloxane, as an organic silicon polymer， can be chemically modified by block copolymerization. Because of its abundant raw materials and excellent properties of modified products, it has been extensively studied by scholars. In this paper, the research progress of polysiloxane block copolymers at home and abroad was reviewed. Some kind of polysiloxane block copolymers modified by polyurea, polyurethane, polyether, polyamide and polyimide were mainly introduced. Also, its performance and application were summarized, and the prospect of its application was forecasted.

Molten salt heat storage system is the key point of solar thermal power station, which has important influence on the safety, reliability and operation cost of power generation system. Based on the analysis of the two element nitrate melt physicochemical properties, the material selection, corrosion resistance, thermal insulation, tank foundation insulation method of the high and low temperature molten salt tank were systematically studied. The optimum design scheme of molten salt tank was given from the angle of technical economy.

Y zeolites with different pore structural and acid properties were studied by XRD, N ₂ physical adsorption, NH ₃-TPD and PyFTIR. The adsorption and diffusion properties of benzene in hierarchical pore Y zeolites were investigated by using intelligent gravimetric analyzer (IGA). It was found that there was no obvious change in the crystal structure of the Y zeolites in the process of modification, while the pore structure, acid type, acidity and acid strength were changed. The mass transfer performance of benzene molecules in the pore level Y zeolite molecular sieve was mainly decided by pore structure. The larger of pore volume Y molecular sieve was, the faster diffusion rate was. It was more conducive to the diffusion of benzene molecule. The amount of saturated adsorption of benzene molecule was depended on the type and intensity of acid type of Y zeolite.

The melt index of soft model was established based on mechanism modeling method because melt index of polypropylene dualloop reactors is difficult to be measured online. The soft sensing model was turned into Hammerstein model as a prediction model in order to realize the prediction model. It is achieved the predictive control of polymerization reaction process based on this prediction model. Finally, the results of simulation illustrate the effectiveness of this method.