Blends containing tetramethyl bisphenol-A polycarbonate: 1. Styrenic polymers

Polymer ◽  
1986 ◽  
Vol 27 (11) ◽  
pp. 1788-1798 ◽  
Author(s):  
A.C. Fernandes ◽  
J.W. Barlow ◽  
D.R. Paul
Keyword(s):  
Bisphenol A ◽  
Bisphenol A Polycarbonate ◽  
Styrenic Polymers

Model of the selective laser sintering of bisphenol-A polycarbonate

1993 ◽  
Vol 32 (10) ◽  
pp. 2305-2317 ◽  
Author(s):  
J. Christian Nelson ◽  
Samuel Xue ◽  
Joel W. Barlow ◽  
Joseph J. Beaman ◽  
Harris L. Marcus ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Bisphenol A Polycarbonate

Conformational features of bisphenol-A polycarbonate

1985 ◽  
Vol 63 (1) ◽  
pp. 103-110 ◽  
Author(s):  
P. R. Sundararajan
Keyword(s):  
Bisphenol A ◽  
Repeat Unit ◽  
Methyl Groups ◽  
Bisphenol A Polycarbonate ◽  
Carbonate Group ◽  
Torsion Angles ◽  
Thermal Crystallization ◽  
Lennard Jones ◽  
Empirical Force Field ◽  
Conformational Energies

Conformational energies have been estimated for the segments of the bisphenol polycarbonate chain, using the Lennard–Jones and Hill's empirical force field type of functions. It is found that the conformation of the carbonate group, defined by the torsion angle ζ, is restricted to the range of 45° to 65°. The rotations χ and χ′ of the methyl groups also show similar limited flexibility. However, accessible conformations of the diphenyl propane (DPP) segment, defined by torsion angles [Formula: see text] and ψ, span a wide area of the [Formula: see text] surface, with the restriction that the rotations [Formula: see text] and ψ be synchronized such that [Formula: see text] or 270°. These features explain the slow thermal crystallization behaviour of the polycarbonate chains. The variability of the conformations of the repeat unit is illustrated with a series of figures.

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