relation between the polymer conformation and the elastic modulus of the crystalline region of polymer

Abstract

Abstract The force required to stretch a polymer chain by 1% ( f value) was calculated from experimental values of elastic moduli E 1 in the direction of molecular axis and the cross‐sectional area of the molecule of 25 well known polymers. The f value is mainly dependent on the conformation of a molecule and almost independent of side groups. The f values of polymers of various types of conformation may be summarized as follows: T type, 4−5 × 10 −5 dyne; TGT G type, 1.5 × 10 −5 dyne; TG(3/1) type, 1 × 10 −5 dyne; T′G′ (7/2) type, 0.58 × 10 −5 dyne; T′G′ (4/1) type, 0.36 × 10 −5 dyne; TTGG type, 0.29 × 10 −5 dyne; where T, G, and G mean trans, gauche and minus gauche , respectively, and the numbers in the parentheses denote helical structures. The reason for an anomalous apparent E 1 value of nylon 6 (α‐form) previously reported was elucidated; it was confirmed that E 1 exhibits a value expected for a polymer with a nearly extended zigzag conformation.