Enhanced melt free radical grafting efficiency of polyethylene using a novel redox initiation method

Modification of Interfacial Interactions in Ceramic-Polymer Nanocomposites by Grafting: Morphology and Properties for Powder Injection Molding and Additive Manufacturing

“…HDPE00 shows a Newtonian plateau at low angular frequencies, whereas AAHDPE00 exhibits a pseudoplastic behavior in the range of angular frequencies evaluated. The increase in viscosity in the low shear region and the pseudoplastic behavior have been reported for long chain branched polyethylene [64,65] as well as for polyethylene grafted with polar groups such as maleic anhydride, glycidyl methacrylate and acrylic monomers [66,67] or silane [68]. Thus, the differences in the complex viscosity of AAHDPE00 and HDPE might be caused by the branching and partial crosslinking of the poly (acrylic acid) employed in the polymer grafting, which results in a more effective entanglement [67]; the hydrogen bonding between the carboxylic acid in the acrylic acid promotes this behavior [67].…”

Tuning Melt Strength and Processability of Polyolefins by Addition of a Functionalized Additive Designed via the TEMPO-Driven Thiol-ene Reaction

“…Over the years, postreactor modification has proven to be a great technique to incorporate additives or fillers to meet the requirements for industrial and commercial purposes. The poor reactivity between hydrophobic polyolefins and hydrophilic additives can be improved by several monomers including maleic anhydride, 14 glycidyl methacrylate, 15 acrylic acid, 16 and others that can be grafted onto the backbone of base polymers such as LLDPE, LDPE, PP, etc. These functional groups impart polarity to the nonpolar polymer interface that further increases its reactivity and interfacial adhesion with other polymer matrices or polar organic compounds.…”

Reactive melt modification of polyethylene by ethyl acrylate/acrylic acid copolymers: rheology, morphology and thermal behavior

“…It has been shown that the surface-modified films of PE, with UV radiation, containing 3.7 % polyacrylic acid reduces the permeability coefficient of the gases by a factor of about 1/6 [8]. Recently, Brito et al [9] have employed redox initiation in the meltfree radical grafting of glycidyl methacrylate and maleic anhydride onto polyethylene (PE) by reactive extrusion. They used a peroxide/reducing agent initiator consisting of dicumyl peroxide and Tin(II) 2-ethylhexanoate to obtain high grafting degrees onto polymer backbones.…”