GNP/CNT Loading On Nonwoven Fabrics Enhance The Solid Particle Erosion Resistance Of TPU

The wind turbine blades is very easy to be destroyed by solid particle from the environment around.Among multitudinous protection strategies,the simplest and most effective one is protective film.Amid all the film materials,TPU turns out to be an ideal materials to fabricate protective film due to its outstanding mechanical properties and excellent erosion resistance.However,frictional heat is inclined to accumulate on the surface of the TPU composites during solid particle erosion process because of poor thermal conductivity,leading to the damage of material property and accelerates the fatigue of TPU material.Therefore,TPU needs to blend with nanoparticles possessing good thermal conductivity to furture improve its solid particle erosion resistance and thermal conductivity.Now,there are still some problems are in previous studies:(1)Many studies only focus on the effect of single nano-fillers on the solid particle erosion wear resistance of TPU matrix composites,the enhancement effect of various fillers on the erosion wear resistance of solid particles is less studied,(2)The dispersion of nano-filler in matrix is nonuniform.(1)The mixture with different GNP/CNT loadings were sprayed on NW to obtain the NW@G/C_x.Then the NW@G/C_x acting as interlayer film was laminated between TPU films to fabricate nanocomposite films using the hot pressing.The results show that GNP/CNT can be uniformly dispersed on the nonwoven fabric and form a three-dimensional network structure.The special three-dimensional network structure is conducive to the transfer of stress,so that the tensile strength of TPU-NW@G/C_1.0reaches 45 MPa and the storage modulus reaches 21.2 MPa,which is 25%and 171%higher than that of pure TPU(35 MPa and 8 MPa)respectively.In addition,the GNP/CNT three-dimensional network can effectively strengthen the TPU and prevent the surface material of TPU from falling off during the impact of solid particles,so that the solid particle erosion resistance of TPU-NW@G/C_1.2 is 37%higher than that of pure TPU.The thermal conductivity of TPU-NW@G/C_1.2 was increased to 0.251W/m·K,increasing by the 5.9%compared with pure TPU.(2)In order to solve the agglomeration problem of GNP/CNT in TPU matrix,the synthetic strategy is employed to obtain PDA/GNP(PG)with better dispersion.The results of chapter two has demonstrated that the enhancement effect of 1.0 mg/m L GNP/CNT was the most significant among all the concentrations(0.8 mg/m L,1.0mg/m L and 1.2 mg/m L).Hence,1.0 mg/m L PG and CNT are ultrasonic on NW to obtain the NW@PG/C_1.0.Then,different layers of NW@PG/C_1.0 and TPU were prepared by hot pressing technology to prepare TPU-NW@PG/C1.0*x(x is the number of layers of NW@PG/C_1.0).The results show that the strong interfacial bonding force between NW@PG/C_1.0 and TPU matrix and the unique three-dimensional network structure are beneficial to transfer the stress.Therefore,while three layers of NW@PG/C_1.0 are added,the tensile strength of TPU-NW@PG/C_1.0*3 reaches the maximum of 46 MPa,which is 35%higher than that of pure TPU.Increasing the interface interaction between GNP and TPU is beneficial for TPU-NW@PG/C_1.0*x to bear greater impact force.Hence,the erosion resistance of TPU-NW@PG/C_1.0*3 is increased by 78%compared with that of pure TPU.The thermal conductivity of TPU-NW@PG/C_1.0*3 increase to 0.346 W/m·K,which is 45%higher than that of pure TPU.