The mechanical strength of oriented and non-oriented polypropylene films was studied at a deformation rate of 50 mm min- 1 and room temperature by using a statistical method. For the oriented and non-oriented films, the numbers of discrete strength levels were found to be eight and nine, respectively. The discrete strength levels were attributed to the spectra of the defects in the form of submicro-, micro- and macrocrazes. Oriented films showed higher levels of mechanical strength -- an effect attributed to the absence of macrocrazes
Посилання на статтю:
Discrete strength levels in polypropylene films / D. Dimitrova, G. Kostov* and G. Garova // Polymer. – 1993. – Vol 34. – P. 4732-4735.