Preparation And Characterization Of Novel Reversibe CO₂-Responsive Photo-Curable Oligomers

In recent years,the stimuli-responsive polymers has attracted more and more attention because of their intelligence,controllability and their wide range of potential applications on smart sensors,bioremediation,controlled drug release and so on.Nowadays greenhouse effect caused by CO2 over emissions highlights the serious environmental problems,so the absorption and utilization of CO2 is also one of the hotspot.Combine these two hot issues together,CO2 stimuli-responsive polymers especially gained more research because of its facile feasibility, reversible response,environmental friendliness and many other advantages.In this paper,on the basis of studies on the conventional CO2 stimuli-responsive polymers we combined photo-polymerization technique which is fast,efficient,energy-saving,environmentally friendly with CO2 responsive polymer to synthesis a class of photo-curable oligomers with CO2 responsive secondary amine groups and photopolymerizable double bond on the side chain.Further explored the effects that different amino content and different secondary amino group have on CO2 stimuli-responsive properties of the oligomers.My specific work are as follows:1. Prepared two kinds of oligomers which were respectively based on propylamine and benzylamine,then characterized their structure and composition.2. Tested the CO2-N2 stimuli-responsive behavior of the two oligomer acetone solution,the two kinds of solutions both exhibited good CO2 reversible response of transparent-turbid transition,wherein benzylamine-based oligomer had faster response and recovery rates than propylamine-based oligomers.3. Both the liquid oligomers showed a dramatic change in viscosity after response to CO2,among which propylamine-based oligomer C experienced a viscosity change from 190 Pa·s to 100045 Pa·s upon CO2 response, reflecting a clear liquid-solid transition.4. Studied the effect that types of amino group,amino content and molecular weight had on thermal stability of the oligomers after CO2 response. Of which the propylamine-based oligomer had stronger CO2-binding thermal stability than benzylamine-based oligomer.5. Characterized photopolymerization kinetics of the oligomers using real-time FTIR,both oligomers exhibited very good photo-curing properties.6. Explored the application on imprint of the oligomer, the stripe pattern imprinted out of CO2-responsed propylamine based oligomer can be well stored under CO2 atmosphere,the pattern could be erased upon heating and could also be permanently cured after photopolymerization.