Preparation And Properties Of Hydrophobic Associative Functional Polymer Hydrogel Materials

Because of its excellent physical and chemical properties,hydrogels are playing an increasingly important role in various fields such as tissue engineering,water retention materials,biological engineering,and environmental engineering.In the application of hydrogels,mechanical properties play a decisive role in broadening its application fields.The use of hydrophobic associations to improve the mechanical properties of hydrogels has matured with the continuous research.In this paper,a P(AAm/DM-LPs)composite hydrogel was prepared by hydrophobic association.In this way,a P(AAm/DM-LPs)/Pd catalyst was prepared by in-situ polymerization and applied to p-nitrophenol.At the same time,carbon nanotubes were introduced into the P(AAm/DM-LPs)system to prepare a P(AAm/DM-LPs)/MWCNTs composite hydrogel,and its application feasibility in the sensing field was explored.The specific work has the following two parts:Part ?:Synthesis of quaternary ammonium salt ionic liquid(DM)and polymethacrylate microspheres(LPs).P(AAm/DM-LPs)composite hydrogel was prepared by free radical initiation.The effect of liquid(DM)hydrophobicity and the adsorption capacity of polymethacrylate microspheres(LPs)on the tensile,compressive and rheological properties of hydrogels.The results show that when the adsorption capacity of LPs is the strongest and the length of the hydrophobic segment of DM is 12 carbons,the mechanical properties of the composite hydrogel are the best,with tensile strength,breaking energy and compressive strength reaching 537 KPa,4274 KJ/m~3,respectively And 3683 KPa.Step by step preparation of P(AAm/DM-LPs)/Pd catalysts for in-situ polymerized palladium(Pd)nanoparticles.The test results show that the catalyst has good catalytic efficiency and recycling characteristics.This part of the work provides the basis for the toughening of hydrogels and the excessive use of precious metal catalysts.Part ?:P(AAm/DM-LPs)/MWCNTs composite hydrogel with both mechanical and electrical properties was prepared by combining carbon nanotubes(MWCNTs)and P(AAm/DM-LPs)system.A dual conductive network system composed of quaternary ammonium salt ionic liquid and MWCNTs was first proposed to improve the conductivity of hydrogels.The effects of the addition of MWCNTs on the mechanical and electrical properties were explored.The conductive network formed when the addition amount reached 0.06 wt%was the most complete.The tensile strength,breaking energy,compressive strength and electrical conductivity reached 789 KPa,6109 KJ/m~3,179 KPa and 7.95×10~-33 S/cm,respectively.The hydrogel also has a high strain coefficient(GF)of about 12.716 and a long service life.This part of the research provides new design ideas and theoretical foundations for hydrogels in the field of sensors.