Characterization of Structure and Self-Diffusion of Elastomers by NMR Method

Кулагина, Т. П.; Karnaukh, G. E.; Смирнов, Л. П.

doi:10.12693/aphyspola.127.1128

Cited by 1 publication

(1 citation statement)

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“…The proton spin-spin relaxation time was chosen because as far as we know it has not been used to evaluate nanomaterials, especially in studies around aging processing and thermoplastic polymers. There are several works related to elastomers that evaluate changes of these materials by spin-spin relaxation time, probably due to the sensibility and also because of the materials high molecular mobility [23] [24].…”

Section: Introductionmentioning

confidence: 99%

Spin-Spin Relaxation Time to Evaluate Degradation of HIPS/Organoclaynano Composites by Aging

Silva¹,

Iulianelli²,

Tavares³

2017

MSA

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NMR relaxometry is one of the techniques that allow observing changes in the molecular mobility that come from materials' morphology. T 1 H has been used to monitor food and polymer sciences. However, T 2 H, although being a revealing as T 1 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 T 2 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 T 2 H data indicated that the clay ratio can influence the chain degradation processes, acting to inhibit or accelerate the aging process [1] [2].

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Section: Introductionmentioning

confidence: 99%