Thermooxidative Stabilization of Acrylonitrile Terpolymers Obtained under Reversible Chain-Transfer Conditions: Effects of Synthesis Temperature and Initiation Methodстатья
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Дата последнего поиска статьи во внешних источниках: 11 апреля 2017 г.
Аннотация:The terpolymerization of acrylonitrile, methyl acrylate, and itaconic acid mediated by a reversible
addition-fragmentation chain transfer agent, dibenzyl trithiocarbonate, and initiated by AIBN at 80°C,
potassium persulfate at 45–55°C, and radiolysis at 20°C is studied. In all the cases, polymerization proceeds via the pseudoliving mechanism, which is preserved up to ultimately high monomer conversions (80–90%).
According to FTIR ATR and NMR spectroscopy, all the synthesized terpolymers are characterized by close
monomer compositions and their degree of branching is too low to be detected spectroscopically. However, the thermal behaviors of terpolymers obtained by polymerizations at various temperatures are different, namely, the lower the temperature of terpolymer synthesis, the slower the thermooxidative stabilization processes occurring in it.