Thermal Cloud Point Fractionation of Poly(vinyl alcohol-co-vinyl acetate): Partition of Nanogels in the Fractions

Polymers

Leonard I. Atanase¹ 

[1] Laboratoire de Photochimie et d'Ingénierie Macromoléculaires (LPIM), Ecole Nationale Supérieure de Chimie de Mulhouse (ENSCMu), University of Haute Alsace, 3, rue Alfred Werner, 68093 Mulhouse Cedex, France; E-Mail

关键词: thermal cloud point fractionation;    poly(vinyl acetate-co-vinyl alcohol) (PVA);    nanogels;    sodium dodecyl sulfate;    complex formation;    particle size determination;   

DOI  :  10.3390/polym3031065

来源: mdpi

【 摘 要 】

Poly(vinyl acetate-co-vinyl alcohol) (PVA), well-known as emulsion stabilizers, are obtained by partial hydrolysis of poly(vinyl acetate) (PVAc). Their thermal cloud point fractionation was performed in aqueous medium between 40 and 75 °C. This fractionation was carried out in order to get an insight in the partition of the initially present nanogels in the different fractions. All the fractions were characterized by size exclusion chromatography (SEC), NMR and dynamic light scattering (DLS) giving access to average degree of polymerizationcould be confirmed. The nanogels characterized by the highest values of volume fraction and Dv, in the range of 40–43 nm, were separated in the first coacervate fraction, whereas the most soluble fraction with low VAc content does not contain nanogels but only “free chains” of a Dv value of around 7–8 nm. The nanogels in the various fractions could further be disaggregated into “free chains” by complex formation with sodium dodecyl sulfate (SDS).

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.