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

摘要: Abstract Di(2-ethylhexyl) phthalate (DEHP) is a commonly employed plasticizer for poly(vinyl chloride) (PVC). Diffusion of di(2-ethylhexyl) takes place when plasticized PVC immersed in hexane. Rather than determining DEHP concentration the immersion solvent, an IR window from 1500 to 1900 cm−1 enabled direct measurement HADD (hexane assisted diffusion) using ATR-IR by monitoring carbonyl absorption at 1715 cm−1. The present study containing 45% (PVC-45, tygon tubing). A fast diffusion process was observed short times (  30 s. Analysis XPS shows outermost surface free after 6 min immersion. After induction period, back coefficients Db were estimated peak areas during subsequent recovery period (10−14–10−15 cm2 sec−1). model proposed associated with re-plasticization that involves change mesosurface glass gel like solid.