Synthesis and performance of new bifunctional stabilizers

Preparation of a novel stabilizer and its thermal‐oxidative stabilization effect on polyamide 6

“…Our results show that the novel stabilizer AG‐HDM containing hindered phenol (AG) and hindered amine light stabilizer (HDM) in the same molecule did show synergism. It has been reported that Tinuvin‐144 , a bifunctional stabilizer containing hindered phenol and hindered amine, is an effective stabilizer. The structure of Tinuvin‐144 is shown Scheme :…”

“…They were originally developed as light stabilizers, but now they are also used as multifunctional additives, since they have been found to work as a radical‐trapping agent, a heavy metal deactivator, a hydroperoxide decomposer, and so on . The HALS and phenolic antioxidants are frequently used together practically , but previous studies have shown either antagonism or synergism . Habicher et al proposed that, mostly, a synergistic interaction has been observed in thermal‐oxidation but an antagonistic one in photo‐oxidation.…”

“…Recently, combination of two or more different functional groups in one molecule has attracted the interest of both academia and industry. Liu et al synthesized new bifunctional stabilizers containing by two‐step controlled isocyanation, and found that these new stabilizers were effective in protecting polypropylene (PP) against photo‐oxidation and thermal‐oxidation. Desai et al reported the synthesis and characterization of antioxidants based on hindered phenol in combination with amines, as well as their performance in polypropylene copolymer.…”

Applications of Isocyanation for Polymer Systems

“…There are many methods to synthesize stabilizers. Isocyanation is a useful method (7,(36)(37)(38)(39)(40)(41)(42). Effective antioxidants of higher molecular weight can be synthesized by direct isocyanation of 2,6-di-teryt-butyl-4-hydroxy methyl phenol (DBHMP) with isocyanate (37) …”

“…Multifunctional stabilizers can also be prepared(39) by the earlier mentioned controlled isocyanation of functional compounds containing active proton such as OH in DHBP (2,4-dihydroxyl benzophenone), DBHMP or TMP (2,2,6,6-tetramethyl-4-piperidinol) with diisocyanate(TDI, HMDI):Polymeric stabilizers can be produced through copolymerization of the above stabilizer monomers(41): Downloaded by [Dalhousie University] at 07:23 09 October 2012 Polymeric stabilizers can also be prepared by hydrosilylation of monomeric stabilizers (41): Downloaded by [Dalhousie University] at 07:23 09 October 2012Polymeric stabilizers can also be prepared by macromolecular reaction:…”