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Influence of the nature of the solvent on the lamellar crystalline structure of block copolymers with an amorphous block and a crystallizable poly(ethylene oxide) block

1977; Wiley; Volume: 178; Issue: 7 Linguagem: Inglês

10.1002/macp.1977.021780721

0025-116X

Monique Gervais, Bernard Gallot,

Polymer Nanocomposites and Properties

Abstract Block copolymers of styrene and ethylene oxide, (SEO), and of butadiene and ethylene oxide, (BEO), in the presence of a preferential solvent of the amorphous block exhibit always a lamellar structure (LC) with crystallized and folded poly(ethylene oxide) chains at temperatures below about 50°C. To precise the influence of the nature of the solvent on the refolding of the poly(ethylene oxide) chains (PEO), we have studied by X‐ray diffraction and differential scanning calorimetry the LC structure of the copolymers BEO and SEO in the presence of different solvents for the amorphous block. The copolymers SEO were studied in the presence of xylene, toluene and diethyl phthalate. Diethyl phthalate being a bad solvent for polybutadiene, the copolymers BEO were studied only in the solvents xylene and toluene. The influence of the nature of the solvent on the extent of the domain where the LC structure exists, on the refolding, and on the crystallinity of the poly(ethylene oxide) blocks is demonstrated.