Abstract
NMR relaxometry is one of the techniques that allow observing changes in the molecular mobility that come from materials’ morphology. T1H has been used to monitor food and polymer sciences. However, T2>H, although being a revealing as T1>H, is rarely used to analyze changes in thermoplastic systems it is more sensitive to the mobile region. High Impact Polystyrene nanomaterials were prepared through solution casting and were exposed for different times to UV light in the air. The samples, removed after each exposure interval, were characterized by T2>H, focusing on the changes in the relaxation data. The results for this parameter showed that the changes in the relaxation data come from the competition of chain scission and chain recombination processes, which occurs due to the UV light influence with increased time. The T2>H data indicated that the clay ratio can influence the chain degradation processes, acting to inhibit or accelerate the aging process [1] [2].
Highlights
Evaluation of the aging process of nanostructured materials by spectroscopic analysis is of great value to understand the chemical changes caused during aging, which influence the chemical and mechanical behavior of these materials [3]-[11]
The main objective of this work was to evaluate the influence of clay addition on the degradation process of High Impact Polystyrene/organoclay systems, prepared by solution casting, submitted to aging, through the proton spin-spin relaxation time parameter
The spin-spin relaxation time is a parameter that is sensitive to fast movements, as is spin-lattice relaxation time, but T2H is much shorter than T1H in solids
Summary
Evaluation of the aging process of nanostructured materials by spectroscopic analysis is of great value to understand the chemical changes caused during aging, which influence the chemical and mechanical behavior of these materials [3]-[11]. They concluded that the clay acts as a catalyst and promotes the degradation of this nanomaterial [12]. Few studies have been published using these relaxation measurements to evaluate polymers, especially the degradation process of polymer nanocomposites. We decided to measure this relaxation parameter to show how it can give good information about degradation changes
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