Reactive antioxidants for polymers

Modification of poly(butylene succinate) with peroxide: Crosslinking, physical and thermal properties, and biodegradation

“…First, PBS may have fewer crosslinking sites than those of PE. The crosslinking reactions by DCP are as follows 23 : DCP cleaves thermally to produce two cumyloxy radicals (1), which abstract hydrogen atoms from polymer chains (2). A cumuyloxy radical can also lead to the formation of a methyl radical and of phenylmethyl ketone (3).…”

Reactive processing of polymers: Melt grafting of glycidyl methacrylate on ethylene propylene copolymer in the presence of a coagent

“…1 Examples of commercial successes include the production of reactively grafted styrenic alloys, silane-modified and moisture-cured polyolefins, maleated polyolefins, supertough nylons, and thermoplastic elastomers. [2][3][4][5] Reactive modification of these polymers was largely achieved either by carrying out the reaction in solution or in the solid state (through in situ reactions in polymer melts).…”

“…16 In our laboratory, we developed a broad and versatile approach to improving the grafting efficiency of functional modifiers (agents) on polymers by in situ cografting of a small amount of a more reactive (compared to the modifier) bi-or polyfunctional comonomer, a coagent. 6,[17][18][19][20][21] The success of this method, in which the coagent acts as a reactive linker between the modifier and the polymer, relies on achieving a delicate balance between the molar ratios of the reagents (agent, coagent, initiator) and the process variables (e.g., temperature, residence time). It was shown, for example, that the use of the trifunctional coagent, trimethylol propane triacrylate (Tris), with different reactive modifiers, such as maleic anhydride 18 and antioxidants, 17,19 gave rise to a dramatic increase in the level of grafting of these modifiers on polymers.…”

Heterophasic Polypropylene Copolymer Grafted with Itaconic Acid: Molecular Structure Analysis Through Fractionation Techniques

“…[3][4][5] The major problem associated with the modification of polymers by grafting is the interference of competing side reactions. A careful review of the chemical grafting was made by Malaika [6] who pointed the development of more efficient initiators, and also the use of new monomers to promote the incorporation of a desired functional group.…”