Study Of Constitutive Equations Of Shape Memory Polymers Driven By Ionic Solution

The shape memory polymer is a kind of smart material,which can not only complete the shape recovery with excellent mechanical properties,and compared with the shape memory alloy has good biocompatibility,biodegradability and sexual desire,have important applications in biological medical field.Especially in the field of drug release in vivo,the role of shape memory polymers is irreplaceable.At this time,due to the shape memory polymer working environment for organisms,must adopt the incentive to complete solution shape recovery this way,and because of containing a small amount of ions,the working environment and to more accurately control the shape memory polymer in drug release in the process of shape recovery as the goal,to be in solution with ion drive the shape memory polymer shape recovery mechanism and constitutive equation for further exploration.The ion containing solution,considering the factors influencing the change of free energy of solution and a small amount of ion absorbed in the shape memory polymer,the chemical potential of polymer,and then consider the shape memory polymer because of its tendency to attribute to the positive and negative ion adsorption,ion effect on polymer chemical potential role and simulation analysis in order to explore the effect of value;intuitive and tendency of ionic species in the shape of the recovery effect,introducing relaxation theory,function relation in the ion under the action of shape recovery time and strain;in addition,the infiltration in the ion in the solution of the polymer as the research object,aiming at ion or solvent molecules between ions and polymer and the role of network the effect of solvent and ion absorption polymer network,establish free energy equation of ions in the solution of ionic solution Fluid driven shape memory polymer free energy of the system;finally,the polyurethane shape memory polymer in the absorption of water molecules are hydrogen bonding behavior of the shape recovery,consider the impact of the establishment and fracture of the hydrogen ion,hydrogen bond mechanics model is established to establish and break process,describe the energy change of hydrogen bond established and composite process the expression and strain energy and constitutive equation.The constitutive equation of the essence of the mechanism of shape memory polymer shape driven ion solution recovery behavior,constitutive equations for the research to provide certain reference value,and shape memory polymer can be accurately applied in bio medical field range of drug release and establish the theory basis.