The Study Of The Toughened HDPE Engineering Plastics With Excellent Rigidity

It is an important orientation to toughen HDPE so that this kind of common plastic can be used as engineering plastic. At present, the best way is elastomer toughening, but it is at the cost of lossing rigidity(etc. TYS, FM). Good rigidity can be achieved by using rigidity particles (organic, inorganic), but the improvement of toughness is limited and this method is mainly suitable for HDPE with good toughness. So it has become an urgent problem to improve the toughness of elastomer toughening HDPE and keep its rigidity at the same time, which is important to the science and application.At first, the relationship between the toughness and the rigidity was analysed, and then we designed the special structure elastomer toughening HDPE, which showed excellent rigidity. In order to obtain satisfied ratio of technique to economy, the designation adopted TMB process, that is, preparing TMB with the designed structure character first, and then transplanting this structure character of TMB into HDPE through thermal mechanical blending of TMB and HDPE.Based on our design, E-type toughening master batch (E-TMB, including E1-TMB and E2-TMB) in different batch formula was developed by using the mechanism and technique of "polymer-bridge conjunction, dynamic vulcanization and microphase separation" which had been used to prepare TMB during former work, with 2200JHDPE(E1) or 5000SHDPE (E2) as matrix resin, EPR or SBR as toughening agent and the addition of bridge agent. Several types of toughened HDPE (HDPE/E-TMB)were prepared by thermal mechanical blending of E-TMB and HDPE. The chemical and morphological structure and MFR of E-TMBs, the morphology, mechanical properties, brittle-ductile transition mechanism, thermal properties, rheological properties, non-isotheremal crystalline behavior of HDPE/ETMBs were characterized by using fraction extraction, TEM, PLM, DSC, TG, DTA , SEM techniques as well as electronic universal testing machine and capillary rheometer etc, and the linear equation was put forward and validated to characterize the relation between apparent viscosity (η_a) of polymer melting or polymer blends melting and...