[Progress in Application of Hyaluronic Acid-based Hydrogel on Surface of Medical Catheters].

Hyaluronic acid (HA) has favorable physicochemical properties and superior biological activities, which is an ideal biomaterial for preparing hydrogel coating. After physically or chemically modifying, HA-based hydrogel coating has been gradually applied to functional modification for medical catheters surface, such as hydrophilic lubricating coating, anti-inflammatory coating, biomedical antifouling coating and blood compatibility improved coating. However, there are still intractable problems in the coating technology of HA hydrogel which is applied to the surface of medical catheters, especially in adhesion, stability and element proportion of HA coating. Finally, the related influencing factors and improvement suggestions are analyzed in this study.

CO2 Fixation and PCHC Depolymerization by a Dinuclear ß-Diketiminato Zinc Complex.

The production of cyclic carbonates and (or) polycarbonates from the coupling of carbon dioxide (CO2 ) with epoxides is a practical strategy for CO2 fixation. Chemically recycling of the polycarbonates is also urgently needed for sustainable development of plastics. Here a dinuclear ß-diketiminato (BDI) methyl zinc complex((BDI-ZnMe)2 , 1) is reported to achieve not only selective cyclic carbonates from cycloaddition of CO2 to meso-CHO in the presence of cocatalyst, but also effective depolymerization of PCHC into trans-CHC. The trans-CHC can be further transformed into cis-CHC, thus demonstrating great application potentials of this strategy in CO2 fixation and chemical recycling of plastics.