Preparation And Properties In The Smart Fluid Of Alkylation Macromolecular And Surfactant

Photoresponsive fluid is an important smart fluid,having great application potentia,which changes rheological properties under the stimulation of light.The key problem of extensive and practical application is how to effectively construct a photoresponsive fluid.A photoresponsive fluid is constructed by "component assembly" idea in this thesis.In the interaction between dodecyl(C12)-modified poly(sodium acrylate)(HMPANa)and surfactants(C16TAB),we introduced a pair of host-guest a-CD/ADA and build an photoresponsive fluid HMPANa/C16TAB/a-CD/ADA.Through the photosensitive surfactant micelles with response to the light,it changes the internal structure of system,and then implements the rheological properties sensitive response to light.On this basis,based on the competitive relationship of a-CD with the tail chain alkane of ADA and C16TAB and the Side chain alkane of HMPANa,we put forward two kinds way of preparation.In the process of preparation of photoresponsive fluid,we found that the transmittance of the system HMPANa/C16TAB/a-CD is very sensitive to temperature,so we prepared a kind of temperature changing to light transmittance hydrogel system.The main work and results are summarized as follows:1.The micelle formation,micelle dissociation and micelle number can be regulated by changing the light condition,which can regulate the internal structure of system in further,and then the rheological properties sensitive response to light can be implemented.Among the system tested,it is concluded that the system 5 g·L-1HMPANa/0.8 mmol·L-1C16TAB/7 mmol·L-1α-CD/5.6 mmol·L-1 ADA and the system 5 g·L-1HMPANa/9 mmol·L-1C16TAB/15 mmol L-1α-CD/12 mmol L-1ADA not only have better photoresponsibility,but also are better reversible.The former system is up to three orders of magnitude,and the latter system is only up to one order because of the low selectivity of inclusion and the isomerization of light efficiency of ADA.2.We found out The Upper Critical Temperature(UCT)of each system.According to the results of electron microscopic test,we discussed hydrogel mechanism of temperature changing to light transmittance:Clathrate to hydration(a-CD/C16TAB)involves in the formation of the micelle by solubilizing to C16TAB micelles.This increases micelle geometric factor of the accumulation unit,and eventually the system internal structure changes from the mesh to layer.The system temperature of internal structure changing depends on the environmental resistance when clathrate to hydration(a-CD/C16TAB)migrates and rearranges,namely the density of the mesh structure.3.We systematically investigated the effects of the content of HMPANa and C16TAB on the properties of the hydrogel(HMPANa/C16TAB/a-CD).This observation indicates that these two factors not only influence UCT,also affect the minimum concentration of a-CD for temperature changing to light transmittance hydrogel system.And we proposed the corresponding interpretation according to the mechanism.