The melt grafting preparation and rheological characterization of long chain branching polypropylene

Relationship between molecular structure, crystallization behavior, and mechanical properties of long chain branching polypropylene

“…Polypropylene (PP) foams, especially blown with supercritical carbon dioxide, have been considered one of the most promising substitutes to replacing other thermoplastics foams (e.g., polyethylene and polystyrene foams) in packaging industries because with excellent foamability can be achieved by introducing long chain branching (LCB) architecture onto the PP backbone through several approaches such as in situ polymerization in a reactor [3][4][5], high-energy irradiation [6][7][8], and melt-free radical grafting [9][10][11][12][13][14][15][16]. Among these approaches, melt-free radical grafting has gained considerable interest due to its low cost and accessibility to industrialization.…”

Melt rheological behavior of PMMA nanocomposites reinforced with modified nanoclay

“…It was also observed that modifier concentration, critical mixing time, and longchain branching influenced the viscoelastic property of PP nanocomposites. [19][20][21] Lim and Park 22 noticed that the presence of randomly oriented anisotropic stacks of silicate layers was responsible for the enhancement of storage and loss modulus in intercalated structure. In another study, 23 it was found that percolation threshold depended upon both concentration and alignment of carbon nanotubes.…”

Preparation and rheology characterization of branched polypropylene during reactive extrusion process

“…When ZDEC was used, the chain scission was reduced, whereas when ZDMC was used, the chain scission was negligible and the formation of LCB-PP was promoted. Many researchers used different quantities of monomers or co-agents to find their effects on the rheological behavior of LCB [19][20][21].…”