REACTION MECHANISM TO LONG-CHAIN BRANCHED PP

We have shown in the present article, starting from the high capacity PP′s on the market, the development of long-chain branched PP which means melt strength PP. As a basis, the radical mechanism were used to synthesize long-chain branched PP. Most known is the process at low temperature by using electron-beam-irradiation developed by Montell. It is shown that by using comonomers like styrene and vinylsiloxan also long-chain branched structures are produceable. To prove the melt strength, the melt rheology in dependence of shear rate, as well as the tensile force via velocity of the melt with the Rheotens-apparatus, are described.