Polypropylene foams under CO2 batch conditions: From formulation and rheological modeling to cell-growth simulation

The objective of this work was to study the development polypropylene (PP) foams with low density (<100 kg m−3) using a CO2 batch process. To carry out study, we used PP-g-MA that chemically modified by reactive extrusion obtain polymer branched structures. Two reagent systems were selected on basis chemical reactions maleic anhydride—the first one is based reaction between anhydride and primary amines (MA/NH2, triamine, Jeffamine T-403), second ionic interactions from Zn neutralization. Both these have shown it possible PP structures favorable foaming compared commercial, high-melt-strength PP. We structure chains can be defined rheological criterion. It defines notion fractal behavior (coupling relaxation modes), which must for nonlinear (strain hardening). This criterion has been analogy sol-gel transition, tan δ = 1. Finally, in terms modeling simulation, plasticizing effect modeled experimental plasticized synthetic oil. A theoretical power law derived then introduced mass balance equations predict cell growth during depressurization.