Design,Synthesis And Performance Regulation Of New Bio-based Itaconate Elastomers For Tires

With the rapid development of the automotive industry and the increasing shortage of fossil resources,not only tires are required to be safe,long-lived,and fuel-efficient,but also higher requirements have been placed on tire raw materials and environmental protection.In previous studies,bio-based itaconate elastomers were prepared by using esterification and copolymerization,using the bulk bio-based chemical itaconic acid as the main raw material.Based on this topic,the effect of monomer ratio on itaconate elastomers on dynamic and static mechanical properties and filler interactions was clarified,and high-performance nanocomposites were prepared through structural optimization and functional modification.Based on the density of bio-based itaconate was introduced into latex styrene-butadiene rubber to modify it and study the properties of composite materials.It is hoped that new elastomers based on bio-based chemicals will find applications in "high-performance"(green)tire materials.In the first part of this thesis(Chapter 2),low-temperature emulsion polymerization was used to design and synthesize poly(dibutyl itaconate/butadiene)copolymer(PDBIB)with different dibutyl itaconate content.Silica and black carbon system is made into a composite material,and compared with commercially available styrene-butadiene rubber,Silica/PDBIB40 and CB/PDBIB70,which have excellent static mechanical properties,are preferred.At the same time,a 200L pilot test of PDBIB was conducted,which provided a certain basis for future industrialization.In the second part of this thesis(Chapter 3),the reactivity of epoxy groups with hydroxyl groups was used to design and synthesize epoxidized poly(dibutyl itaconate/butadiene/Glycidyl methacrylate)(PDBIBG),during the preparation of the composite material,ring-openingoccurred between the silica and the PDBIBG matrix to form covalent bonds,and the dispersion of silica was significantly improved.The tensile strength is between 12 and 16 MPa,and the elongation at break is between 200 and 300%.The dynamic mechanical properties of PDBIBG30 are comparable to SSBR 2466,and it has good application potential for low rolling resistance green tires.In the third part of this thesis(Chapter 4),bio-based dibutyl itaconate was introduced into ESBR to synthesize D-ESBR with different dibutyl itaconate content,and to prepare silica/D-ESBR nanocomposites.After the ester group was introduced into styrene-butadiene rubber,the dispersibility of silica in the rubber matrix and the interfacial interaction between silica and the rubber molecular chain were improved.The physical and mechanical properties and dynamic mechanical properties of silica/D-ESBR nanocomposites with different DBI contents were studied.The results show that D-ESBR with a DBI content of 5%has excellent comprehensive mechanical properties,lower heat production rate,lower rolling resistance,better abrasion resistance and better aging resistance.