BROAD-BAND DIELECTRIC STUDY ON BINARY BLENDS OF BISPHENOL-A AND TETRAMETHYLBISPHENOL-A POLYCARBONATE

Authors
KATANA G KREMER F FISCHER EW PLAETSCHKE R
Citation
G. Katana et al., BROAD-BAND DIELECTRIC STUDY ON BINARY BLENDS OF BISPHENOL-A AND TETRAMETHYLBISPHENOL-A POLYCARBONATE, Macromolecules, 26(12), 1993, pp. 3075-3080
Citations number
46
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecules → ACNP
ISSN journal
00249297
Volume
26
Issue
12
Year of publication
1993
Pages
3075 - 3080
Database
ISI
SICI code
0024-9297(1993)26:12<3075:BDSOBB>2.0.ZU;2-P
Abstract
Broadband dielectric spectroscopy (10(-1) to 10(7) Hz) and differentia l scanning calorimetry (DSC) have been used to study the alpha- and be ta-relaxations in blends of bisphenol-A polycarbonate (BPA-PC) and tet ramethylbisphenol-A polycarbonate (TMBPA-PC) in the temperature range from 93 to 553 K. All blends show one broadened alpha-relaxation as co mpared with the homopolymers. At temperatures below T(g) the beta-rela xations corresponding to both homopolymers are observed in the blends. The beta-relaxation strength obeys dilution laws with no indication o f a critical TMBPA-PC concentration above which the beta-relaxation in BPA-PC is totally suppressed.