Effect of exposure to ultraviolet light on the strength of polymers

Effect of fullerene C60 and γ radiation on mechanical properties and radiation resistance of low-density polyethylene

“…Such a behavior of the LDPE samples upon an increase in C can be attributed to localization of the C 60 molecules in amorphous and interspherulite regions of LDPE [5]. An increase in R indicates the development of struc turing (cross linking), while a decrease in R indicates the destruction of chain molecules of the matrix [3,10,11].…”

Accelerated failure of bisphenol‐A polysulfone during electron beam irradiation under an applied stress

“…The pellets were dried by heating to 150°C in a vacuum oven and compression moulded at 220°C and 5 MPa in a nitrogen atmosphere to produce films about 0.3 mm thick. The films were cut into 5 X 50 mm strips, which were annealed at 170°C in vacuum for 6 h to remove stress, and equilibrated in air for 1 week.…”

“…Brown and O'Donnel13 found that the flexural strength of PSF was largely unaffected by doses of y radiation up to 6 MGy in vacuum at 35 and 125"C, although it was reduced by 50% after approximately 2 MGy in air at both temperatures. Davis et a1.…”

“…Some early studies of the effects of applied stress during UV, reactor, and electron irradiation of natural and synthetic polymers, including silk, cotton, nylon, polystyrene, poly ( methyl methacrylate 1, polycarbonate, PTFE, cellulose triacetate, polyethylene and poly (ethylene terephthalate) , [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] showed that radiation increased the rate of creep and decreased the time to failure in these polymers under tensile stress.…”