Interactions in a blend of two polymers greatly differing in glass transition temperature

0360789 - ÚMCH 2012 RIV US eng J - Journal Article
Kratochvíl, Jaroslav - Šturcová, Adriana - Sikora, Antonín - Dybal, Jiří
Interactions in a blend of two polymers greatly differing in glass transition temperature.
Journal of Polymer Science. Part B, Polymer Physics. Roč. 49, č. 14 (2011), s. 1031-1040. ISSN 0887-6266
Institutional research plan: CEZ:AV0Z40500505
Keywords : differential scanning calorimetry (DSC) * fouriertransform infrared spectroscopy (FT-IR) * glass transition temperature
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 1.531, year: 2011

Blends of poly(N-methyldodecano-12-lactam) PMDL with poly(4-vinyphenol) PVPh have been studied by the DSC and ATR FTIR methods. The difference in glass transition temperature Tg between the components is 206 ºC. A single composition-dependent Tg suggests miscibility of the system, that is, homogeneity on the scale of about 10 nm. The Schneider's equation applied separately to low- and high-PVPh regions provides good agreement with experiment; the calculated curves cross at the point of PVPh weight fraction 0.27. In the low-PVPh region, the analysis indicates weak interactions and strong involvement of conformational entropy. In the high-PVPh region, strong specific interactions predominate and entropic effects are suppressed. According to ATR FTIR, hydrogen bonds between PVPh as proton donor and PMDL as proton acceptor induce miscibility in blends of higher PVPh content (above about 0.28 weight fraction). In low-PVPh blends, it is conformational entropy that enables intimate intermolecular mixing.
Permanent Link: http://hdl.handle.net/11104/0198256