Preparation And Modification Of PAMPS/PAAM Tough Double Network Hydrogels Of Their Mechanical Properties

Hydrogels have broad research prospects because of their environmental sensitivity,low surface friction,small molecule permeability,high water absorption and high water retention,but the traditional hydrogel mechanical strength is not high,the application is limited.This topic in the synthesis of PAMPS/PAAM high-strength double-network hydrogel based on the addition of different substances to modify the hydrogel,with a view to comprehensively improve the mechanical properties of hydrogel.This thesis is divided into two parts,the first part,the use of efficient redox radical polymerization method,2-acrylamide-2-methyl propane sulfonic acid and acrylamide monomer PAMPS/PAAM double network hydrogel study Effects of initiator,crosslinking agent and monomer ratio on gel properties.The results showed that the first network initiator 0.6%,the amount of crosslinking agent 4%(with the first network monomer molar ratio).The second network crosslinking agent 0.1%(with the second network monomer molar ratio),two layers of network monomer ratio of 1:2,the gel performance to achieve the optimal compression strength of 11.18MPa,compression Deformation to 86.42%;tensile strength of 0.28MPa,elongation at break of 196%;water content of 84.8%,the equilibrium swelling rate of 560%.The second part,adding different substances to improve the mechanical properties of PAMPS/PAAM gel.Under optimized conditions,the effects of polyvinylpyrrolidone,diatomaceous earth,diatomaceous earth and octadecyl methacrylate with hydrophobic groups on the properties of DN gel were investigated.The properties of the resulting gel were tested by the methods of swelling,scanning,stretching and compressing.Experiments show that when the amount of diatomite is 15%,the compressive strength of gel is the highest,which is 23.76 MPa,which is 2.1 times that of 11.28 MPa of common double-network hydrogel,and the toughness of gel is also better,and the compressive deformation reaches 97.25%when there were tiny cracks.When the content of diatomaceous earth is 4%,the gel has the highest tensile strength of 0.76MPa,an increase of 2.7 times and the elongation at break of 276%compared with 0.28MPa of the common double network hydrogel,196%of common dual network hydrogel.