Long chain branching on linear polypropylene by solid state reactions

Numerical simulation of polypropylene foaming process assisted by carbon dioxide: Bubble growth dynamics and stability

“…However, this approach has been shown not effective for PP (Sugimoto et al, 2001). The main and efficient method to prepare HMSPP is to incorporate long-chain branch (LCB) by chemical modification (Auhl et al, 2004;Borsig et al, 2008;Cao et al, in press;Mabrouk et al, 2009;Yao et al, 2009;Ye et al, 2004). Many researchers have carried out experimental investigation on the effect of LCB on foamability of PP.…”

Preparation and rheology characterization of branched polypropylene during reactive extrusion process

“…Polypropylene is used in thermoplastic processes due to its desirable properties such as low cost, low density, high melting point, stiffness and good chemical resistance [1][2][3]. However, PP exhibits low melt strength and weak strain hardening behavior which limits its applications in foaming, blow molding and thermoforming.…”

Melt rheology of linear and long-chain branched polypropylene blends

“…Among these methods, introducing branches onto the backbone of commercial PP seems to be a more efficient approach because of its accessibility to industrialization and less cost [9]. Since the presence of LCB is generally known to enhance the melt strength of polymer, several approaches have been developed to synthesize long-chain branched polypropylene [10,11]. Long-chain branches are commonly introduced to linear PP via electron beam or gamma irradiation [12,13] and chemical modification [14,15].…”