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Dimensional stability of polystyrene/polymeric liquid crystal blends
Author(s) -
Apicella A.,
Iannelli P.,
Nicodemo L.,
Nicolais L.,
Roviello A.,
Sirigu A.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260904
Subject(s) - materials science , polystyrene , composite material , extrusion , thermoplastic , polymer , creep , liquid crystal , phase (matter) , organic chemistry , chemistry , optoelectronics
Recovery experiments above T g have been performed on polymeric liquid crystal (PLC) ‐ polystyrene (PS) blend sheets obtained from extrusion and subsequent hot drawing. The data reported show that a significant improvement of the dimensional stability of a drawn thermoplastic material can be obtained by adding a low percentage of non‐compatible polymeric liquid crystals that are oriented during the hot drawing process. The fibrils formed act as a constraint for a certain amount of polymer surrounding them and consequently these highly oriented sheets, once exposed to high temperature, will mainly stress relax and do not creep. This effect disappears when the melting temperature of the oriented crystalline phase is reached. Compatible PLC‐PS blends do not show any improvement on the dimensional stability compared to the unfilled matrix.