Preparation And Properties Of Enhanced And Toughened Camellia Oil Based Polymeric Materials Through Introducing Nucleobase-Functionalized Celluloses

Natural plant oil is a kind of abundant biomass resource,so people have paid great attention to replace the traditional fossil based functional materials.However,the general mechanical properties of plant oil-based polymers are poor because of their flexible chain segments.How to improve the mechanical properties and widen the range of application of plant oil-based materials has become the focus of researchers.In this paper,strong and tough camellia oil-based polymeric materials with ingenious design of specific hydrogen bonding and covalent network were constructed by introducing nuclebase functionalized cellulose and nuclebase functionalized camellia oil copolymers.Nuclear Magnetic Resonance(NMR),Gel chromatography(GPC),Differential scanning calorimetry(DSC),mechanical stretcher,Dynamic thermomechanical analysis(DMA)were used to characterize the synthesis of monomers and polymers,thermodynamic properties,mechanical properties of and the toughed mechanism of camellia oil-based polymeric materials,etc.The following conclusions are obtained:(1)Preparation and properties of epoxy camellia oil and adenine copolymers:we first prepared a series of epoxy camellia oil monomer(ECO)and acrylate adenine monomer(AAc)with different molar ratio P(ECO-co-AAc)s.The results showed that:P(ECO-co-AAc)s were successfully prepared.The relative weight average molecular weight of P(ECO-co-AAc)s is21.8-79.8 k Da and the relative dispersion is 2.18-3.95.The glass transition temperatures(T_gs)of P(ECO-co-AAc)s increase with the increase of AAc molar amount(-56.3-8.9?).(2)Preparation and properties of polymers containing thymine:First,we designed three kinds of rigid polymers containing thymine as reinforcing agent:Cell-g-PTAcs,Cell-T and P(UDA-T).The results showed that the relative number average molecular weight of Cell-g-PTAcs was181.8-379.4 k Da,relative dispersion was 2.65-3.35,T_g were 55.5-57.3?;the relative number average molecular weight of Cell-T was 51.6k Da,relative dispersion was 2.70,there was no obvious T_g between-50-150?;the relative number average molecular weight of P(UDA-T)was 20.8 k Da,relative dispersion was 1.51,T_g was 26.3?.(3)Preparation,properties and strengthening mechanism of camellia oil-based polymer composites:we prepared camellia oil-based polymer composites by solvent casting method.The results show that the mechanical properties of Cell-T reinforced camellia oil-based polymer composites are obvious(strength 3.1-15.6 MPa,strain 45-60%),the mechanical properties of Cell-g-PTAc reinforced camellia oil-based polymer composites are moderate(strength 1.3-1.8MPa,strain 97-228%),and the mechanical properties of P(UDA-T)reinforced camellia oil-based polymer composites are investigated(strength 0.7-5.1 MPa,strain 70-80%).Taking Cell-T reinforced camellia oil-based polymer composites as an example,the strengthening mechanism is that there is A-T specific pairing between Cell-T and(P(ECO-co-AAC)s),so multiple specific hydrogen bonds can be formed.In addition,the unsubstituted hydroxyl group on cellulose can react with the epoxy group on(P(ECO-co-AAC)s to form a chemical crosslinking.Supramolecular hydrogen bonding and covalent network cooperate with cellulose to enhance camellia oil-based polymer composites.