Polybenzimidazole Bearing Benzimidazolyl Pendants: Synthesis and Proton Conductivity

Kim, Sejung; Kim, Pil; Lee, Youn-Sik; Park, Seok Bae; Lee, Sang‐Hee; Nah, Changwoon

doi:10.5012/bkcs.2010.31.5.1411

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Recent studies include DEHP diffusion into media such as water [23] or aqueous organic solvents. [24] Pentane was studied by Vergnaud as a solvent for extraction of DEHP. [25] Rates of diffusion were determined as a function of immersion time by HPLC.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of di(2-ethylhexyl)phthalate in PVC quantified by ATR-IR spectroscopy

Wang

Johnson

Suleman

et al. 2015

Polymer

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Di(2-ethylhexyl) phthalate (DEHP) is a commonly employed plasticizer for poly(vinyl chloride) (PVC). Diffusion of di(2-ethylhexyl) phthalate (DEHP) takes place when plasticized PVC is immersed in hexane. Rather than determining DEHP concentration in the immersion solvent, an IR window for PVC from 1500-1900 cm-1 enabled direct measurement of HADD (hexane assisted DEHP diffusion) using ATR-IR by monitoring the DEHP carbonyl absorption at 1715 cm-1. The present study employed PVC containing 45% plasticizer (PVC-45, tygon tubing). A fast diffusion process was observed for short times (< 30 s) while a slower diffusion process occurred at longer immersion times (30 s < t < 6 min). A synergistic increase in mesosurface T g toward that of PVC coupled with low solubility of hexane in PVC accounts for decreased DEHP diffusion rates (10-12-10-13 cm 2 sec-1) for immersion times > 30 sec. Analysis by XPS shows the outermost surface is PVC free of plasticizer after 6 min immersion. After an induction period, back diffusion coefficients D b were estimated from peak areas during a subsequent fast recovery period (10-14-10-15 cm 2 sec-1). A model is proposed for the induction period associated with re-plasticization that involves a change from a mesosurface glass to a gel like solid.

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Section: Introductionmentioning

confidence: 99%

“…These and related studies involved analysis of DEHP in the solvent after immersion [23,24,27,28]. We discuss below an ATR-IR method that provides direct measurement of early-stage DEHP near surface diffusion.…”

mentioning

confidence: 99%