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Cold rolling of polymers 2. Toughness enhancement in amorphous polycarbonates
Author(s) -
Broutman Lawrence J.,
Krishnakumar Suppayan M.
Publication year - 1974
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760140402
Subject(s) - materials science , izod impact strength test , composite material , birefringence , amorphous solid , toughness , polymer , residual stress , ultimate tensile strength , optics , crystallography , chemistry , physics
The effect of cold rolling on the Izod impact strength of amorphous polycarbonates has been studied. The impact strength is a function of the roll reduction as well as the original sheet thickness. Sheets varying from 0.125 to 0.645 inches in thickness have been studied and roll reductions up to 50 percent have been utilized. It is shown that enhancement in impact strength occurs at very small percent roll reductions. The orientation release stress has been measured as a function of roll reduction and the internal stresses through the thickness of the sheets have been studied by birefringence methods. It is suggested that the residual stresses are responsible for impact enhancement rather than the molecular orientation.