Accession Number : AD0685606
Title : STUDIES OF THE TOUGHNESS OF POLYCARBONATE OF BISPHENOL A IN LIGHT OF ITS SECONDARY TRANSITION.
Descriptive Note : Technical rept.,
Corporate Author : PRINCETON UNIV N J FRICK CHEMICAL LAB
Personal Author(s) : Locati,Giancarlo ; Tobolsky,Arthur V.
Report Date : FEB 1969
Pagination or Media Count : 80
Abstract : Results from different techniques on amorphous polybisphenol-A carbonate(NMR, dielectric, mechanical) in the temperature range -150 C to room temperature were reviewed. Shear creep and stress relaxation measurements were able to resolve into two components of the broad relaxation process (gamma transition), the high symmetry of which was previously apparent from the results of torsion pendulum experiments. One of the two processes is attributed to relaxation of carbonate groups; the other seems to originate from some restricted motions of the phenol group. An attempt to correlate the high impact strength of polybisphenol-A carbonate and the observed molecular movements was made. (Author-PL)
Descriptors : (*PHENOLS, POLYMERS), (*POLYMERS, STRUCTURAL PROPERTIES), PHENOLS, CARBONATES, NUCLEAR MAGNETIC RESONANCE, DIELECTRIC PROPERTIES, SHEAR STRESSES, CREEP STRENGTH, RELAXATION TIME, MOLECULAR STRUCTURE, IMPACT SHOCK
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE