Characterization of the microstructure of latexes by thermally stimulated currents

Author

Cebeillac, P. ; Lacabanne, C. ; Dupuis, P.

Author_Institution

Lab. de Phys. des Solides, Univ. Paul Sabatier, Toulouse, France

fYear

1988

fDate

1-3 Sep 1988

Firstpage

457

Lastpage

461

Abstract

The microstructure of latexes has been investigated by differential scanning calorimetry (DSC) and thermally stimulated currents (TSC). The copolymers were prepared by emulsion copolymerization of acetate (A). Three series of samples were obtained: an SC copolymer, obtained by semicontinuous feeding with A and S; and ASS and SAS copolymers, both obtained by step feeding with A and S, but in different order. The SC copolymer is characterized by a narrow glass transition and a single-TSC peak. Analysis of the fine structure of the peak shows that it is associated with a single compensation law. This behavior is typical for a statistical copolymer. On the other hand, copolymers prepared by step feeding have a broad glass transition and two TSC peaks. This behavior is characteristic of block copolymers. This result is confirmed by the existence of two compensation laws, indicating a biphasic structure. The SAS copolymer has been found to have a higher segregation than ASS, probably because of higher reactivity of styrene and its hydrophobicity

Keywords

glass transition (polymers); polymer blends; polymer structure; thermal analysis; thermally stimulated currents; DSC; TSC; TSC peaks; acetate; acetate-styrene copolymers; biphasic structure; block copolymers; compensation law; copolymers; differential scanning calorimetry; emulsion copolymerization; fine structure; glass transition; hydrophobicity; latexes; microstructure; reactivity; segregation; semicontinuous feeding; statistical copolymer; step feeding; styrene; thermally stimulated currents; Amorphous materials; Calorimetry; Conductivity; Glass; Microstructure; Rheology; Synthetic aperture sonar; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)

Conference_Location

Oxford

Type

conf

DOI

10.1109/ISE.1988.38602

Filename

38602