Coagent assisted polypropylene radical functionalization: monomer grafting modulation and molecular weight conservation

摘要: The occurrence of significant degradation by β-scission reaction is a severe drawback affecting the classical procedure polypropylene (PP) functionalization in melt with maleic anhydride (MAH) or derivatives and free radical initiators. present work deals control PP blocks using specially designed furan derivative, butyl 3-(2-furyl) propenoate (BFA), as coagent able to scission during process. More specifically MAH BFA were used functionalizing reagents for propylene/ethylene 77/23 mol% semi-block copolymer (PPC) either separately mixture (MAH/BFA) different molar ratios. PPC functionalized samples then characterized determining number grafted groups (functionalization degree FD) molecular weight (MW). Finally, effect feed conditions on process properties are discussed hypothesizing mechanism, which takes into account all occurring parallel reactions.