Synthesis And Application Of Supramolecular Elastomers Based On Self-assembled Metal Macrocycles

Supramolecular polymers constructed on the basis of non-covalent interactions have attracted much attention due to their unique and excellent properties.Unlike traditional polymers,supramolecular polymers interconnected by non-covalent interactions usually exhibit self-healing and recyclability,but suffer from poor mechanical properties.By combining the respective advantages of supramolecular compounds and polymers,supramolecular polymers can obtain dynamic self-healing properties while maintaining mechanical properties.In the research process of supramolecular polymers,supramolecular coordination complexes(SCCs)play an important role,for example,metallocycles have abundant easily modified building blocks and regular geometries,through host-guest chemistry and hydrogen bonds.The introduction of supramolecular polymers into supramolecular polymer systems can endow them with some unique properties,such as multiple responsiveness,antibacterial properties,electrical conductivity,etc.In this thesis,supramolecular coordination complexes(SCCs)are combined with supramolecular polymers through the polyurethane reaction of amino groups and isocyanate groups,and the corresponding research is carried out.The specific research contents of this thesis are as follow:The first part: the construction of supramolecular polymer PINS(hereinafter referred to as N0-N5)based on supramolecular coordination complexes through noncovalent interactions(hydrogen bonds and metal coordination).Different concentrations of s were added to the polymer crosslinking network,and different elastomers were prepared for testing to explore the effect of supramolecular metallacycle on supramolecular polymers.When the elastomer reaches the best performance,the ratio is N3 group,N3 elastomer not only exhibits excellent stretchability(710%)and toughness,but also exhibits great self-healing and recyclability,and N3 elastomer has good thermal stability and low glass transition temperature,exhibiting excellent elastomer characteristics.The N3-Ag NWs biomimetic conductive material prepared based on N3 elastomer exhibits good toughness and self-healing conductivity.This study provides an experimental basis for self-healing biomimetic conductive materials.Part II: Synergistic construction of supramolecular polymer PISS(Hereinafter referred to as P0-P4)based on supramolecular coordination complexes(SCCs)through non-covalent interactions(hydrogen bonds and metal coordination)and reversible covalent interactions(disulfide bonds).By controlling the feed ratio of SCCs,the effects of different concentrations of metal rings on supramolecular polymers were tested.The supramolecular elastomer P3 not only exhibits good ductility and mechanical strength(656%,0.6 MPa),but also exhibits good self-healing and elasticity.Based on P3 elastomer,P3-Ag NWs biomimetic conductive material can be prepared.This conductive material has good toughness and normal temperature self-healing property.This study provides ideas for the design of supramolecular polymers,and also provides an experimental basis for the development of new materials such as nanobionic materials.