Preparation And Properties Of Gel-fabric Self-healing Synergistic Toughening And Stab-resistant Composites

Soft stab-resistant materials are currently the most widely used protective materials.However,they still have a series of weakness such as insufficient stabresistance and inability to recycle.Therefore,this project chooses the hydrogels which have self-healing and high-strength performers as the research starting point.And we are aiming to achieve the self-healing performers of stab-resistant materials based on ensuring the protective performance of stab-resistant materials,to make it recycled and reduced the waste of raw materials.In view of this,this paper prepared a soft punctureresistant composite through three parts.The main research results obtained are as follows:(1)The puncture-resistant soft composite is successfully prepared by Pluronic/PMEA hydrogel as the matrix and aramid fabric as the reinforcing material.The results show that the gel matrix has a self-healing efficiency of 84%,and the peak force of the spike stab resistance and knife stab resistance of the composite has increased by 1202% and 1133% compared with the pure fabric.In addition,the puncture-resistant soft composite has much higher mechanical properties than neat components,which indicating that the gel matrix and the aramid fabric have a strong synergistic effect.(2)The hydroxyapatite nanoparticles(HAP NPs)were introduced based on the first part,and investigated the influence of the concentration of monomer MEA and the addition amount of HAP NPs on the puncture resistance soft composite.The results show that the mechanical properties of the hydrogel are better when the MEA concentration is 5mol/L and the addition amount of HAP NPs is 4%,and the corresponding puncture-resistant soft composite has the best stab resistance,which indicates that the toughness of the hydrogel matrix has a great influence on the mechanical properties of the composite.The peak force of the spike stab resistance and knife stab resistance of the composite has increased by 132% and 130% again.In addition,the introduction of HAP NPs increases the temperature or time required for the self-healing process of the gel matrix,but has little effect on the self-healing efficiency.(3)The multilayer gel-fabric composite was prepared by the best performance nanocomposite hydrogel as the matrix,and the influence of the lamination angle and gel volume fraction of the performance of the composite was investigated.The results show that the composite has a 52% self-healing efficiency and it still has excellent performance after multiple punctures.The composite has the best performance when the lamination angle is 45° and the gel volume fraction is 45%,and the 37-layer composite can meet the dynamic stab resistance standard.In addition,the mechanism of gel-fabric synergistic toughening was verified through the characterization of the interface strength,and the stab resistance was predicted through theoretical models and formulas which verifying the validity of the measured results.In conclusion,this work has prepared a self-healing,high-strength punctureresistant soft composite.This composite has excellent stab resistance among soft protective materials,and it is expected to provide new ideas for the development of puncture-resistant materials with excellent puncture resistance and recyclability.