Preparation And Performance Of Stimuli-responsive Smart Material Based On PDMAEMA

Smart materials prepared by stimuli-responsive polymers are one of the hot topics in material science.These polymers can respond to external stimuli such as light,p H,and temperature.In recent years,stimuli-responsive polymers have attracted the attention of researchers in various fields.Due to the excellent reversible performance of polydimethylaminoethyl methacrylate(PDMAEMA)and the advantages of its simple preparation,this paper took it as a starting point to construct a stimuli-responsive smart material.1.The hydroxyl group on the surface of halloysite nanotubes and ammonium cerium nitrate were used to construct a REDOX system.The grafting polymerization of DMAEMA on the surface of halloysite nanotubes was carried out to obtain the multi-stimuli-responsive hybrid material HNTs-PDMAEMA.Then,gold nanoparticles were loaded onto HNTs-PDMAEMA by the method of in-situ reduction to obtain a hybrid material HNTs-PDMAEMA-Au with controllable catalytic performance.Infrared spectrophotometer,X-ray powder diffraction,transmission electron microscopy,thermogravimetric analyzer and other instruments were used to characterize the prepared hybrid materials,and the composition and structure of HNTsPDMAEMA-Au were studied.At the same time,the catalytic performance of HNTsPDMAEMA-Au was tested by 4-nitrophenol reduction reaction.Firstly,the catalytic performance of HNTs-PDMAEMA-Au was measured at different p H values,and then the catalytic reaction rate was adjusted by adjusting the p H value to achieve the purpose of controllable catalytic efficiency.In addition,the dispersion state of the catalyst can be changed by adjusting the p H to achieve the purpose of recovery of the catalyst.Due to the obvious dependence between HNTs-PDMAEMA-Au catalyst and the ambient temperature,the catalytic efficiency can be regulated by changing the temperature to achieve controllable catalysis and recovery.In addition,the catalytic activity of HNTs-PDMAEMA-Au catalyst remained above90% after 6 cycles,which indicated that HNTs-PDMAEMA-Au had good stability.2.Double-bond modified spiropyran monomer SPMA and double-bond modified ?-cyclodextrin(AC-?-CD)were firstly synthesized.Then,a stimuli-responsive self-healing hydrogel poly(SPMA-DMAEMA-co-?-CD)was prepared by one-pot copolymerization of DMAEMA,SPMA and AC-?-CD.The hydrogels were characterized by infrared spectrophotometer,plate rheometer and scanning electron microscope.Based on the stimulation response characteristics of PDMAEMA,the hydrogel has p H and temperature responsiveness.The hydrogel has the properties of light response and real-time light recording due to group of photoisomerism in the gel.In addition,dimethylamino and cyclodextrin cavities on the side chain of PDMAEMA in the gel can form host-guest interaction,which makes the gel have good self-healing propertie.