Premium
Effect of random copolymer additives on the interfacial tension between incompatible polymers
Author(s) -
Stammer Andreas,
Wolf B. A.
Publication year - 1998
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19980201)19:2<123::aid-marc123>3.0.co;2-j
Subject(s) - copolymer , surface tension , polymer chemistry , polymer , materials science , chemistry , thermodynamics , composite material , physics
Interfacial tensions γ were measured for mixtures of poly(methylphenylsiloxane) (4 kg/mol) and poly(dimethylsiloxane) (24 kg/mol) in the absence and in the presence of small amounts of the random copolymer poly(dimethylsiloxane‐ ran ‐methylphenylsiloxane) (89 mol‐% of dimethylsiloxane units, 28 kg/mol) from 25 to 110°C. Approximately 1 wt.‐% of the copolymer additive suffices to reduce γ from ca. 2.2 to 1.6 mN/m. The time dependence of the apparent γ value in the course of the attainment of equilibria also indicates surface acivity. The hypothesis is formulated that the efficiency of the random copolymer for a reduction of γ is bound to the condition that it is only sparingly soluble in both blend components.