Characterization of ethylcellulose free films by positron annihilation spectroscopy and mechanical testing

Microsegregating blends of ethyl cellulose and poly(vinyl pyrrolidone): a combined thermo-mechanical and positron annihilation spectroscopy study

“…The results obtained for the pure polymers are in accordance with previous literature reports. The 3 measured for ethyl cellulose is 2.40 ns, comparable with the 2.32 ns reported for commercial Ethocel 45 (Hegyesi et al 2014) 3 = 1.86 ns (measured for PVP40) (Shpotyuk et al 2016), in perfect agreement with our measured value of 1.87 ns. The centroid of the o-Ps lifetime distribution decreases monotonically on increasing the content of PVP360, as can be expected by considering the remarkable difference of lifetimes in the two pure polymers.…”

“…Despite the industrial relevance of this kind of coatings, however, the study of their properties is still an open field of investigation (Chan et al 2005;Kutsenko et al 2013) and no reference is currently available for the study of EC-PVP blends with PALS. Only a few studies have been dedicated to the single polymers ethyl cellulose (Doyle, S.;Malhotra, B. D.;Peacock, N.;Pethrick 1984;Hegyesi et al 2014) and PVP (Li et al 2003;Shpotyuk et al 2016) and none to their blends. The aim of this study is to fill such a gap, providing a novel understanding of such important blends by means of a combined thermomechanical analysis and PALS study.…”