Some elastic moduli of bisphenol A polycarbonate

The Young's modulus of oriented bisphenol A polycarbonate films were measured along, 45° to, and normal to the direction of orientation by the vibrating reed technique. The change in modulus with the degree of orientation was fitted to a theoretical curve, using an IBM 704 electronic computer. The basis for fitting the data to the theoretical curve was the assumption that the process of orienting the polymer molecules could be described by an affine transformation. The elastic moduli calculated are as follows: The Young's modulus for stretching the chain is 5.4 × 10 11 dyne/cm. 2 ; the Young's modulus for separating a bundle of parallel chains laterally is 1.76 × 10 10 dyne/cm. 2 ; and the shear modulus for the relative displacement of a bundle of parallel chains along their length is 2.00 × 10 10 dyne/cm. 2 .