Wang Xianhong

Synthesis and properties of carbon dioxide based copolymers

The utilization of CO2 as a raw material to prepare high value-added chemicals has attracted extensive attention because it is an abundant, cheap and renewable C1 source. Currently, two CO2 copolymers have been proved of industry value. One is CO2 based plastics (PPC), and the other is CO2 based polyurethane (CO2-PU), which are synthesized from copolymerization or telomerization of CO2 and propylene oxide, respectively. The 20 years’ research in Changchun Institute of Applied Chemistry witnessed the great progress in synthesis and performance improvement of CO2 based copolymers. Though challenges still exist, their bright future is predictable.

Effect of Electrostatic Reduced-Gravity Environment on the Crystallographic Parameters of Melt-Crystallized Polypropylene

An electrostatic reduced-gravity device was developed and used specially for the study of the melt crystallization of polypropylene. The crystal structure of melt-crystallized polypropylene prepared under the reduced-gravity environment was investigated by using X-ray diffraction. The experiment results show that the crystal structure of the polypropylene is strongly dependent on the gravity applied to the sample during solidification. It is found that the crystallographic parameters a and b increase markedly with reduced-gravity ratio, while the value of c increases mildly.