3.When the content of PU is 15%,the mechanical properties of composite are optimal:the tensile strength is 60.57 MPa and impact strength is 23.56 kJ/m2.The tensile strength and impact strength are increased by 32.77% and 115%,respectively,compared with the pure EP.
4.When the mass ratio of MG to EP is 1:1,the tensile strength is 79.72 MPa and the impact strength is 17.83 kJ/m2.Compared with the composite reinforced by SiO2 particles with the same content,the tensile strength and impact strength of MG/PU/EP are increased by 18.91% and 11.51%,respectively.
5.The experiment results showed that the tensile strength and impact strength were improved from 23.90 MPa and 30.04 kJ/m2 to 25.39 MPa and 36.40 kJ/m2 respectively when ramie fiber was mercerized by using NaOH.
7.With the content of 5%wt ultrafine calcium carbonate, tensile strength of PP is 33.68MPa, tensile modulus is 1.38GPa, izod impact strength is 9,38KJ/m2.
8.When both of the mass fractions of the glass fibers was 30%,the tensile strength,bending strength and impact strength of LFT-PET were 1.4,1.5 and 3 times of those of SFT-PET respectively.
9.Yield stress, tensile stress, tensile stretch, reduction in cross-section and impact absorbed energy are 667.5MPa, 760MPa, 23%, 72% as well as 183J(-20℃) respectively.
