Premium
Influence of spacer length between interacting group and polymer backbone on the glass transition temperature of electron‐donor/electron‐acceptor blends
Author(s) -
Bolsinger Michael,
Schneider Hans Adam
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950735
Subject(s) - glass transition , miscibility , polymer , acceptor , electron donor , polymer chemistry , materials science , electron acceptor , chemistry , chemical physics , crystallography , photochemistry , organic chemistry , composite material , physics , condensed matter physics , catalysis
Charge transfer Interaction (CT‐I) between electron‐donor/electron‐acceptor groups contributes to an enhancement of the miscibility in polymer blends. Typical of polymer blends with charge transfer interaction is an increase of the glass transition temperature, suggesting a decrease of the free volume during mixing of the blend components. Both, “zip”‐like orientation effects of the CT‐I onto the polymer backbones and temporary crosslink formation may contribute to the reduction of the free volume. The effect generally decreases with increasing spacer length between the interacting groups and the polymer backbone, although an increased probability of electron‐donor/electron acceptor (EDA) association may be accepted due to the enhanced mobility of the interacting endgroups. Thus the increased probability of EDA association is overcome both by the increased mobility of the temporary crosslinks and by the decrease of the induced orientation effect on the polymer backbone of the CT‐I due to the enhanced decoupling of the mobile interacting groups from the less mobile polymer backbone. Because of the possibility of D/2A association of the carbazolyl end‐group the effect is more complicated. For the same overall spacer length of the interacting EDA groups the deviation from the additivity of the glass transition temperatures of the polymer blend components is always the larger the longer the donor‐spacer.