Premium
The influence of elongational flow on hydrogen bond formation and stability of the homogeneous phase of binary hydrogen‐bonded polymer blends
Author(s) -
Dormidontova Elena E.,
Brinke Gerrit ten
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200008)158:1<125::aid-masy125>3.0.co;2-3
Subject(s) - hydrogen bond , polymer , materials science , thermodynamics , polymer chemistry , homogeneous , phase (matter) , dumbbell , copolymer , hydrogen , chain (unit) , flow (mathematics) , chemical physics , chemistry , molecule , composite material , organic chemistry , mechanics , physics , medicine , astronomy , physical therapy
Macrophase separation tendency induced by flow in binary blends of polymers capable of single hydrogen bonding between one of the chain ends is studied analytically. To describe the conformational and orientational properties of a polymer chain a simple dumbbell model is applied. It is demonstrated that with an increase of flow rate the association rate decreases because of the extra stretching of the associated chain compared with the two initial homopolymer chains. On the other hand flow promotes association by improving the chain orientation for hydrogen bonding. As a result, at relatively weak flow the homogeneous state becomes less stable due to the decrease in the fraction of hydrogen bonded diblock copolymer‐like chains. At larger flow rates the fraction of hydrogen bonded chains slightly increases enhancing to some extend the stability of the homogeneous phase.