Abstract
Broadband dielectric relaxation spectroscopy and thermally stimulated depolarization currents (TSDC) measurements were employed to investigate effects of confinement on the glass transition of the hydrogen bonded liquid propylene glycol (PG) and the non-associating liquid N-methyl- ε-caprolactam (NMEC). The liquids were confined 2-dimensionally in the pores of porous glasses with mean pore diameter 2.5⩽ d⩽20.0 nm and 3-dimensionally confined in butyl rubber with mean droplet diameter 7⩽ d⩽11 nm. The data provide evidence for both the cooperativity concept and the existence of two states (interfacial layer and liquid). With decreasing d the α relaxation associated with the glass transition of the liquid becomes faster and broader and the glass transition temperature decreases. These effects are larger for 3- than for 2-dimensional confinement. The cooperativity length, ξ, at T g is determined to ξ⩽6 nm for PG and ξ⩽12 nm for NMEC.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
