The Performance Research Of Polymer Materials Filled And Modified By Coal Gangue

The feasibility that making the cheap compositions of PVC, PP, PE and other polymers filled with coal gangue powder were investigated in this paper, and the influence of morphology, coal gangue powder content etc. on the material fracture behavior was also investigated.The ternary compositions of coal gangue powder encapsulated by EPDM (Ethylene Propylene Diene Monomer) filled PP were prepared to reduce the cost and control the microstructure aiming at high performance cost ratio materials. The result showed that EPDM can not only enhance the interaction between coal gangue powder and the matrix but also promote the dispersion of coal gangue powder. With the addition of coal gangue encapsulated by EPDM, the impact strength of composition dropped greatly, but it still kept about 11kJ/m2 when the content of encapsulated coal gangue powder is more than 18wt%. The tensile strength and fracture toughness (we) also dropped with the addition of encapsulated coal gangue powder, but only a small drop occurred when the content of encapsulated coal gangue powder is less than 18wt-% and great drop emerged when the content is larger than 18wt-%. Compared to coal gangue powder/PP binary composition, the ternary compositions involve higher content of coal gangue powder but present better properties.Poly (vinyl chloride) (PVC)/ethylene-vinyl acetate copolymer (EVA) blends were prepared. To study the effect of EVA content on the phase morphology and fracture behaviour, evaluated by means of Essential Work of Fracture method (EWF). The results clearly showed the prominent influence of phase transformation on fracture toughness of the blends. At low EVA content (<7phr), EVA was dispersed in the PVC matrix as separated small particles, and with EVA content increasing, the amount of EVA particles in PVC/EVA blends increased, resulting in diminished distance among the dispersed particles and increase of specific essential work of fracture(w_e). The enhanced w_e values were attributed to the increase of specific essential work of fracture in the necking and tearing stage (w_e,n), although the specific essential work of fracture before yielding (w_e,y) decreased. When EVA content was up to 9phr, the EVA particles were observed to adhere to each other and formed a coherent phase, which caused sharp decrease of w_e as the result of simultaneous decrease of w_e,y and w_e,n. On the other hand, the specific plastic work,βw_p, was barely affected by the increase of EVA content. After these result, the mechanic performance of PVC/coal gangue powder/EVA ternary composition was investigated. The result showed that the tensile strength of compositions decreased with the increasing of encapsulated coal gangue powder and the drop extend accorded with the adding content. The break elongation also decreased with the increasing of encapsulated coal gangue powder. At the same time, with the adding of encapsulated coal gangue powder, the impact strength of composition dropt greatly, but kept to some value when the content of encapsulated coal gangue powder increasing sequentially.Coal gangue powder disposed by different methods and filled into PE to make film. The result showed that the PE film with great amount of coal gangue powder can be blown successfully. The film with disposed coal gangue powder had better performance than the film with undisposed coal gangue powder. When the mass ratio of coal gangue powder was reached 20%, the film exhibits the certain performance. However, when the mass ratio of coal gangue powder increased to 30%, the tensile strength increased, but both the elongation and the tear strength decreased. With great coal gangue powder, the dispose effect of PP-g-MA was the best.