辐射增感交联的某些影响因素研究

A RESEARCH ON SOME FACTORS AFFECTING RADIATION SENSIBILIZED CROSS-LINKING

The influence of unsaturation of various polyethylene on the radia-tion cross-linking, with and without polyfunctional monomers, was investigated.The results showed, that the suspended double-bonds of vinylidene has highercontribution to the radiation cross-linking. The polyethylene contained a bit moredouble-bonds possessed auto-sensibilized cross-linking action. The sensibilizing agentadded outside posses has very small influence on the acceleration of radiation cross-linking. The effects of three autioxidants (1010, 3114 and PG) on the radiation cross-linking efficiency of LDPE were studied. Experimental results showed, both 1010 and3114 decreased the amount of crosslinking at a given dose, contrarily, the PG increasedit. PG decomposed by radiation and produced OH radical which could accelerate theradiation cross-linking. When the polyfunctional monomer was added to the system, the radiation cross-linking of LDPE containing 1010 was accelerated. However, for sample cotaining PGthe sensibilizer exhibited very small influence on the radiation cross-linking.