Preparation And Properties Of Rubber-based Functional Composites

Adaptive mechanical behaviors in nature have inspired the development of synthetic adaptive composites,with those responsive to water particularly relevant for biomedical applications.Polymer nanocomposites containing cellulose nanocrystals(CNCs)are prime examples of water-responsive mechanically adaptive materials.structures of composites control the internal stress transfer by changing the degree of interaction between adjacent nanofibers,which is critical for the composite modulus.The main contents are as follows:1.A new type of functional elastomer was prepared by using cellulose nanocrystalline as filler and natural rubber and epoxidized natural rubber with epoxy degree of 50%.The performance of the functional elastomers under different packing amounts and the performance difference between the functional elastomers under the same packing amount were studied.The results show that the performance of the functional elastomer under different filler contents and the performance difference between the functional elastomers under the same filler contents are studied.The results show that functional elastomers have the best water response performance when the filler content is 15%and the epoxy degree is 50%The mechanical properties,water swelling properties,water response performance and recovery performance of the functional elastomers with 50%epoxy degree were analyzed.The results showed that CNCs were well dispersed in functional elastomers.As the amount of CNCs in the functional elastomer increases,the storage modulus,water swelling properties,water response performance and recovery performance continue to increase.In addition,the degree of swelling of the functional elastomer with an epoxy degree of 50%was significantly higher than that of the NR functional elastomer.2.Firstly,the CNCs-FS filler mixture was prepared.The network structure formed by the hydrogen bonding between the filler mixtures and the microstructure of the filler mixture were studied.The FTIR and Zeta potentials and the atomic force-infrared of the filler mixture were studied.The synergistic effect between the filler mixture and its mechanism was analyzed.Then,using ENR as the matrix,adding different volumes of CNCs-FS filler mixture,prepared another functional elastomer.The functional elasticity of this water response lies in the existence of a variety of hydrogen bonds,and then build a variety of network structure,the functional elastomer play an enhanced role,while immersed in water,the hydrogen bond is destroyed,modulus greatly reduce.After redring,a variety of network structures are re-formed,the modulus is significantly improved,back to the original level.