Premium
Morphology in Immiscible Polymer Blends During Solidification of an Amorphous Dispersed Phase under Shearing
Author(s) -
Deyrail Yves,
Michel Alain,
Cassagnau Philippe
Publication year - 2002
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450800602
Subject(s) - materials science , shearing (physics) , isothermal process , shear rate , composite material , polycarbonate , shear flow , quenching (fluorescence) , shear (geology) , amorphous solid , morphology (biology) , rheology , thermodynamics , crystallography , optics , chemistry , physics , genetics , biology , fluorescence
Solidification under shear of dispersed polycarbonate (PC) fibers in copolymer polyethylene‐methyl acrylate matrix (EMA) was investigated using a hot optical shear device. First, the deformation of PC droplets and its modeling under isothermal conditions were studied for comprehension purposes. Overall agreement with literature models was found and the main influence of the viscosity ratio has been stressed. Second, the morphology control through dynamic quenching was experimented. It consists of solidifying the amorphous PC dispersed phase under shear flow. Break‐up times of PC fibers were taken into account. Shear rate and quenching‐time balance was demonstrated. Thus, during dynamic solidification, a fibrillar morphology could be obtained through rapid quenching. Long quenching times allow nodular morphology, whose size depends on the shear rate used. PC rods can be obtained by adjusting the shear rate during dynamic quenching.