Behavior of Copolymers and Polymer Mixtures

Relaxation spectra in extension (H) of poly(methyl acrylate), poly(methyl methacrylate), and three copolymers with compositions indicated, reduced to I00°C. Lines drawn with slope of — Mole percent methacrylate, left to right 0,42, 61, 75,100. (Fujino, Senshu, and Kawai. °°) 

Examination of the relaxation modulus in extension, E(t), for this same series 

Composite curves for the relaxation modulus in extension, E(i)y for the polymers and copolymers of Fig. 12-14, reduced to 100 C. Mole percent methacrylate, left to right, as in Fig. 12-14. 

The effect of such a change in with composition on the mechanical properties 

Relaxation modulus of poly(vinyl alcohol) (PVA) poly(vinyl formate) (PVF) and partially formylated poly(vinyl alcohol)s with mole percentages of esterification as indicated, reduced to 80°C. (Nakatani, lijima, Suganuma, and Kawai. ) 

---