Rheometrical studies on the process of polyethylene and ethylene copolymers corss-Linking in the presence of peroxides.Part I.Elaboration of the methodology of investigations

摘要

Possibility of applying of a reheometer"Wulkametr WG-03"(produced by"Metalchem",Gliwice,Poland,Fig.1),widely used for rubber curing course estimation,to checking of PE-LD crosslinking process was studied.Three various stabilized compositions of PE-LD and dicumyl peroxide(Table 1)were prepared and crosslinked in the vulcameter,at isothermal conditions at 170,180 or 200 deg C.On the basis of curves of torque moment(M)versus time(t)dependences,the following characteristic parameters of crosslinking process(Fig.2)have been determined:minimal and maximal M value,initiation time of crosslinking and time of maximal M.Very good repeatability of M=f(t)dependence at constant temperature(Fig.3)has been found.Relative standard deviations of characteristic parameters of PE-LD crosslinking process are placed in the range from 2.5 to 7.1% of average values determined from 10 measures(Tables 2-4).The results obtained show that Wulkamert WG-03"(after slight modification)and the method described can be used for polyethylene crosslinking process checking so wider than original purpose of the apparatus.