In the study, EPP materials found no significant cross-linking phenomenon in the reaction extrusion. The higher the peroxides used to modify the long-linked branches, the more the branched chain of the modified EPP. But at high levels of peroxide, you can detect zero. 5. 2 percent gel. Therefore, the long chain branching of polypropylene by PoDIC is necessary to obtain more branched chain and avoid the cross-linking of EPP material, so the use of PoDIC is needed to explore the system. In addition, the efficiency of PODIC on linear polypropylene is dependent on the size of the PODIC side base R, and at the same time, the longer side base can produce higher branched efficiency. The long chain branched of polypropylene by reaction extrusion method has a good prospect of industrial application and is a hot topic in recent research.

However, in order to obtain the LCBPP of different long chain branching, the addition of peroxide and multi-functional monomer needs to be tested systematically. As in the process of the preparation of LCBPP, more functional monomer M homopolymerization will occur, some may also be the question of macromolecular radicals to form crosslinked network, therefore in the process of reaction to optimize reactive extrusion process, the multifunctional monomers need through the metering pump accurately in the extruder, guarantee the stability of the reaction; At the same time, in the exhaust of the extruder, the vacuum is removed, and some solvents and unreacted monomers are eliminated, and the reaction is made to remove the product after the product is processed. Due to the harsh conditions, it is necessary to study the reaction equipment, process formulation and process conditions. How to improve grafting efficiency more effectively and avoid the emergence of gel is the key to the reaction.