Zobrazeno 1 - 10
of 18
pro vyhledávání: '"P. G. Kelleher"'
Publikováno v:
Journal of Polymer Science: Polymer Physics Edition. 14:2113-2117
Publikováno v:
Polymer Engineering and Science. 20:995-1001
DSC analysis of acrylonitrile-butadiene-styrene (ABS) samples either weathered outdoors for up to 10 years or aged at 71°C has shown that these plastics deteriorate most readily through the polybutadiene (BD) component. Oxidation of the BD in ABS le
Publikováno v:
Polymer Engineering and Science. 22:370-375
A number of commercially available polycarbonates, including formulations made flame retardant by two different modifications, have been exposed to conditions producing moderately rapid hydrolysis. Hydrolysis rates were calculated from molecular weig
Publikováno v:
Polymer Engineering and Science. 23:537-542
The hydrolytic stability of glass fiber reinforced poly(butylene terephthalate) (PBT), poly(ethylene terephthalate) (PET) and polycarbonate (PC) was studied. The activation energies in kcal/mole for hydrolysis are 26 for PBT and 23 for PET. Both PBT
Publikováno v:
Polymer Engineering and Science. 22:260-264
The hydrolytic stability of poly(butylene terephthalate) (PBT) resins and compounds was studied. Rates of reaction were determined by measuring changes in melt flow rate. Hydrolysis was slightly accelerated by contact of PBT with glass containers and
Publikováno v:
Journal of Applied Polymer Science. 26:1777-1786
Elevated temperatures and high humidity decrease the molecular weight and impact strength of polycarbonate. Hydrolysis of injection molded polycarbonate (PC) bars stored in glass containers at 85°C and 96% relative humidity (RH) produced brown surfa
Autor:
B. D. Gesner, P. G. Kelleher
Publikováno v:
Journal of Applied Polymer Science. 12:1199-1208
Prolonged heating at temperatures below 140°C. causes only slight changes in the properties of polysulfone. Exposure to ultraviolet light, however, results in substantial changes as evidenced by broad absorption in both the hydroxyl and carbonyl reg
Autor:
B. D. Gesner, P. G. Kelleher
Publikováno v:
Journal of Applied Polymer Science. 13:2183-2191
Polysulfone, polycarbonate, and phenoxy resins were aged under thermal and ultraviolet light conditions. Thermoxidative processes in polysulfone and polycarbonate are of such minor significance as not to impart noticeable losses in these materials be
Autor:
L. B. Jassie, P. G. Kelleher
Publikováno v:
Journal of Applied Polymer Science. 9:2501-2510
Infrared spectroscopy was used to study the thermal oxidation, accelerated and natural photooxidation of acetal homopolymer and copolymer. Chain scission is the predominant reaction, as revealed by changes observed in the hydroxyl, carbonyl, and meth
Autor:
P. G. Kelleher, B. D. Gesner
Publikováno v:
Journal of Applied Polymer Science. 13:9-15
A study has been made of the photolysis and photo-oxidation of phenoxy resin. Photolysis results in the evolution of hydrogen, methane, ethane, propene, propane, toluene, and the oxides of carbon. Also observed are increased yellowing, a rapid rise i