Secondary structural motions in polycarbonate. II. Identification of the motions and their relation to impact strength

Abstract The impact strength of polycarbonate, exhibited over a wide temperature range, is due to the existence of overlapping dynamic mechanical loss peaks in this same temperature range. A dielectric analysis of the motions causing these peaks indicates they impart impact strength by providing a large number of degrees of motional freedom over which the energy of an impact may be dissipated. The magnitude of the impact strength is directly related to the magnitude of the dynamic mechanical dissipation factor measured under the same conditions.

[1]  E. Sacher.  A relation between toughness and the dynamic mechanical properties of polymer films , 1975 .

[2]  H. L. Williams,et al.  Molecular motions in bisphenol a polycarbonates as measured by pulsed NMR techniques. I. Homopolymers and copolymers , 1974 .

[3]  P. Vincent.  Impact strength and mechanical losses in thermoplastics , 1974 .

[4]  E. Sacher.  The impact strength of polycarbonate , 1974 .

[5]  G. Wignall,et al.  Investigation of short range ordering in polymers by means of radial distribution functions derived from X-ray diffraction , 1973 .

[6]  G. Allen,et al.  The impact strength of polycarbonate , 1973 .

[7]  P. Geil,et al.  Morphology-property studies of amorphous polycarbonate , 1973 .

[8]  E. Kramer,et al.  Small-angle x-ray scattering from amorphous polycarbonate , 1973 .

[9]  E. Baer,et al.  Crazing, yielding, and fracture in polycarbonate and polyethylene terephthalate at low temperatures , 1973 .

[10]  G. Yeh,et al.  Relation between Free Volume and the Low-Temperature “Beta” Transition in Glassy Polycarbonate , 1973 .

[11]  I. Yannas,et al.  Chain‐backbone motion in glassy polycarbonate studied by polarized infrared spectroscopy , 1972 .

[12]  R. E. Robertson,et al.  The elastic, anelastic and plastic components of strain in the load-extension curve for bisphenol-A polycarbonate† , 1972 .

[13]  D. Legrand.  Yielding, crazing, and fracture of polymers. II. Studies of the retraction of crazed and drawn films , 1972 .

[14]  E. Sacher.  A model for the local mode relaxation process in poly(ethylene terephthalate) , 1971 .

[15]  I. Yannas,et al.  Infrared spectroscopic evidence for polycarbonate chain backbone motion below Tg , 1971 .

[16]  C. Chung,et al.  Low-temperature mechanical relaxations in polymers containing aromatic groups , 1971 .

[17]  G. Allen,et al.  Relaxation phenomena in some aromatic polymers: effect of water content on the low temperature relaxation , 1971 .

[18]  H. L. Williams,et al.  Proton spin relaxation in bisphenol-a polycarbonate, butyl rubber, and their composites , 1970 .

[19]  R. Legras,et al.  Correlation between the enthalpy of fusion and the specific volume of crystallized polycarbonate of bisphenol A. , 1970 .

[20]  D. R. Falcone,et al.  Nuclear magnetic relaxation in seven polymers , 1970 .

[21]  D. G. Legrand,et al.  Crazing, yielding, and fracture of polymers. I. Ductile brittle transition in polycarbonate , 1969 .

[22]  P. Erhardt,et al.  Dynamic mechanical properties of polymers , 1969 .

[23]  Y. Wada,et al.  Relation between impact strength and dynamic mechanical properties of plastics , 1967 .

[24]  E. Hazell,et al.  The effect of thermal pretreatment on the strength of polycarbonate , 1967 .

[25]  W. Frank,et al.  Electron microscopic investigations on amorphous polycarbonate , 1967 .

[26]  J. Heijboer,et al.  Dynamic mechanical properties and impact strength , 1967 .

[27]  T. Jones.  The relationship of performance characteristics to basic parameters of polymers. I. A collaborative study of polystyrene using torsion pendulum and impact methods , 1967 .

[28]  T. Hara,et al.  Dielectric Property of Polycarbonates , 1964 .

[29]  Hermann Schnell,et al.  Chemistry and physics of polycarbonates , 1964 .

[30]  K. Illers,et al.  Molecular motions in polyethylene terephthalate , 1963 .

[31]  Lawrence E. Nielsen,et al.  Mechanical Properties of Polymers , 1962 .

[32]  P. Vincent.  The tough-brittle transition in thermoplastics , 1960 .

[33]  F. H. Müller,et al.  Vorbehandlung und dielektrisches Verhalten Hochpolymerer , 1959 .

[34]  F. H. Müller,et al.  Veränderungen des dielektrischen Relaxationsspektrums von Hochpolymeren bei Verstreckung und Vorbehandlung Polycarbonat , 1959 .