HALS stabilisers, analysis

Dielectric analysis has also been applied to study polymer thermal ageing [894], e.g. of adhesive bonded structures [895]. Dielectric loss is a means for detecting early steps in polymer degradation by oxidation, although nowadays CL is a strong competitor. The dielectric behaviour of post-irradiation oxidised PP/HALS was also reported [796]. Dielectric analysis has not been extended to many elastomer applications. Dissociation and mobility of salt complexes as heat stabilisers in PA4.6 have been investigated by means of DIES the technique was also used to study thiourea-doped PVAL [903]. 

Thermal analysis is widely used to study the efficiency of antioxidants (stabilisers) for polyolefins. Woo et al. [117] observed that high temperature oxidation acceleration for HDPE originates from the volatilisation of Irganox 1076. This is in accordance with the rate of volatilisation of Irganox 1010, as determined by TG [119]. Wang et al. [247] have used TGA to evaluate the thermostability of various low and high-MW HALS. 

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