Determination Of Properties Of Deep Eutectic Solvents Based On Hyperbranched Polyester And Their Applications

Since most polymers have low solubility or even insoluble in DES,it is of great significance to find a polymer-DES pairing or polymer-based deep eutectic solvent system with good mutual solubility.After extensive screening,two highly branched polyester-based DES systems,Boltorn/EG and Ch Cl/Boltorn/EG,or highly branched polyester-DES systems with good mutual solubility,were found for the first time in this thesis.The interactions between molecules in each system were investigated by measuring the thermodynamic and kinetic properties of the above systems.Studies have shown that for both systems,increased temperature leads to decreased density and viscosity and increased conductivity,which is caused by increased thermal motion within the molecules and decreased hydrogen bonding forces.?1?Boltorn/EG:InEG solvent,at the same temperature,solubility H20<H40<H30;The particle size of Boltorn in EG is H40>H30>H20.The density of Boltorn H20,H30 and H40 hydroxyl groups increased gradually,while the carbon chain of Boltorn H40 branched alkyl group was more,and the longer the alkyl chain,the more weakened the hydrogen bond forming ability was.In the temperature range of308.15-338.15k,temperature increase will lead to a decrease in density and viscosity,and an increase in conductivity.This is due to the increased thermal motion within the molecule and the weakening of the hydrogen bond interaction.The increase of Boltorn concentration leads to the increase of density,viscosity and conductivity.?2?Ch Cl/Boltorn/EG:In the DES system of Ch Cl/Boltorn/EG,temperature rise leads to decrease in density and viscosity and increase in conductivity.This is due to the increased thermal motion within molecules and the weakening of intermolecular interactions,especially the weakening of hydrogen bond interactions.An increase in the molar ratio of Ch Cl/EG will enhance the association between Ch Cl/and EG,resulting in an increase in density and viscosity.When the molar ratio of Ch Cl/EG was 1:4,the conductivity of the solution peaked.At this time,the"end"effect of Boltorn molecular chain was weakened,resulting in an increase in the conductivity of the solution.With the increase of Boltorn concentration,density and viscosity,the conductivity showed an increase-decrease trend,which indicated that there were at least two opposite forces,which could be explained by the polymer"end"effect,polymer chain entanglement and hydrogen bond interaction force changes.With the increase of Boltorn molecule concentration,the"end"effect was enhanced,resulting in the decrease of the conductivity of the solution.At the same time,as the density of hydrogen bond site decreases,the hydrogen bond effect also weakens,which leads to the increase of the conductivity of the solution.The experimental results show that the hydrogen bond effect is dominant in the case of high Boltorn molecule concentration,while the"end"effect is dominant in the case of low Boltorn molecule concentration.?3?Catalysis of hyperbranched polyester in the process of 1,2-epoxypropane:In the study to select a range of different types of common metal catalyst,this paper studies the catalytic performance good calcium iodide?Ca I₂?catalyst,18-crown-6 ether?18-C-6?,choline chloride?Ch Cl?and different series of hyperbranched polyester?Boltorn HX0?as catalyst.The effects of reaction temperature,reaction time,different catalyst system and different H₂O/PO mole ratio on reaction conversion were investigated.Nuclear magnetic resonance spectroscopy?¹H-NMR?explains the special chemical shift between hyperbranched polyester and calcium iodide.