Effect Of Solvent And Nano-Polymerization On The Performance Of BZ Self-oscillating Gels

By coupling Belousov Zhabotinsky（BZ）reaction,self-oscillating gel shows spontaneous and periodic volume swelling-deswelling,which converts chemical energy into mechanical energy spontaneously and is applied to the study of bionic motion behavior.The traditional BZ self-oscillating gel is fragile and slow response,which limited its application.Preparation of BZ self-oscillating gel with fast response and high mechanical performance is still a challenge.In order to improve the delay of chemical-mechanical oscillation and the poor structural stability of the network in the self-oscillating hydrogel,solvent effect and nano-polymerization effect were used in this thesis to improve the toughness and response dual function of BZ self-oscillating hydrogel.And the two effects on the network structure of gel were analyzed.In this thesis,the N-isopropylacrylamide（NIPAM）-Ru gels were synthesized with thermal polymerization using CH₃OH/H₂O（Ⅴ/Ⅴ）solutions with different ratios.The actual grafting concentration of catalyst in gel was determined.The spatial structure,mechanical properties,swelling and deswelling properties and temperature response of the NIPAM-Ru（Ⅱ）gels were characterized.The maximum tensile length at break of the synthetic gel with optimized volume ratio was 376.31%.Deswelling equilibrium can be achieved within 11 seconds,with a volume shrinkage rate of 55%.The NIPAM-Ru（Ⅱ）gels were synthesized with DMSO/H₂O（Ⅴ/Ⅴ）solutions in different ratios.And the actual grafting concentration of catalyst in the gel was measured by UV spectrophotometry.The spatial structure,mechanical properties,swelling and deswelling properties and temperature response of the NIPAM-Ru（Ⅱ）gels were characterized.The performance differences of NIPAM-Ru（Ⅱ）gels in DMSO/H₂O solvent system was analyzed.The difference of synthesized of NIPAM-Ru（Ⅱ）gels between DMSO/H₂O（Ⅴ/Ⅴ）solution and CH₃OH/H₂O（Ⅴ/Ⅴ）solution was also analyzed.The optimized NIPAM-Ru（Ⅱ）gel adhesive showed a uniform and interconnected pore structure,which was conducive to the rapid water transport and the maintenance of the internal stable structure.And showed good expansion and contraction performance and temperature responsiveness.The volume difference between swelling and deswelling of this optimized gel is 0.271 at 24℃.Both the volume deswelling rate and swelling rate are 40%when the temperature changes from50℃to 20℃.In general,the properties of NIPAM-Ru（Ⅱ）gels synthesized with DMSO/H₂O solution are better than CH₃OH/H₂O solution.Based on DMSO/H₂O（Ⅴ/Ⅴ）solvent effect,the temperature responsive nano-gel containing dangling double bonds was used as the crosslinker to synthesis nano-polymerization NIPAM BZ self-oscillating gels.The catalyst concentration,the crosslinker concentration,solvent ratio and nano-gel content in BZ self-oscillating gel were optimized.The spatial structure,mechanical properties,expansion and contraction properties,temperature response and stimulation response of the BZ self-oscillating gel were characterized.The reason for the improvement of mechanical properties and response speed of BZ self-oscillating gel by nano-gel were analyzed.The swelling-deswelling volume difference of the nanocomposite BZ self-oscillating gel with DMSO/H₂O（6/4,V/V）is 0.419,and the maximum tensile length at break is 754.974%.The deswelling equilibrium can be reached within 8 s.The spatial stability is better,and clear chemical waves can still be observed after 3 hours reaction.Compared with the traditional gel,the chemical wave can spread stably in the gel.The preparation of BZ self-oscillating gel with fast response and high mechanical properties was realized.In this study,the network structure of BZ self-oscillating hydrogel was regulated by solvent effect and nano-polymerization effect.BZ self-oscillating gel with high toughness and fast response was synthesized,which provide reference for the design and structural optimization of bionic robots,and laid the foundation for further realizing fast bionic motion.The synthesis method can be extended to other gel systems.The dissertation has 48 pictures,9 tables,and 102 references.