Crosslinking Behavior Of Lldpe Special Materials

In this paper the crosslinking behavior of linear low density poly ethylene (LLDPE)/ Poly (octylene ethylene) copolymer (POE) blends were studied by peroxide crosslinking.While LLDPE and POE were processed in twin screw extruder in low temperature, the rising of temperature was obviously and not easy to control due to the strong effect of shearing process.when we process in twin screw extruder at low temperature. It was more effect in melt temperature by the stabilizationg of mainframe heating,machine head temperature,feed speed and screw speed. One of the main factors during process was the different length-diameter ratio of twin screw extruder.we selected low length-diameter ratio screw stem to process generally. Peroxide crosslinking results showed that the gel fraction of crosslinked LLDPE and POE increased with the content of initiator and the vulcanization time. And the gel fraction of crosslinked LLDPE was enough at certain value and certain time.Through the change of mechanical property that blends of different blend proportion. We could see that the impact-strength of LLDPE/POE decreased with the percent of POE increasing in total constituents. Compared with the impact strength of LLDPE/1.5DCP.POE. The blend of LLDPE/POE/1.5DCP was better but the degree of rising was not obviously.The LLDPE/POE blends were studied in Shuangkun open mill. The effect of peroxide proportion and processing technology on gel fraction of crosslinked LLDPE/POE blends and the relationship between gel fraction and the mechanical properties of compound were investigated. The results showed that the gel fraction of LLDPE/POE blends increased with the content of dicumyl peroxide (DCP),vulcanization time and the incremental of crosslinking time and reached maximum at a certain value. The gel fraction of blends showed no difference with different feeding sequence of DCP. Dynamic mechanical thermal analysis (DMTA) behavior of blends was influenced by the gel fraction of blends. The gel fraction of blends showed no obvious effect on tensile behavior of blends.