Abstract: | The glass‐transition temperature (Tg) of the poly(vinylidene fluoride) (PVF2)‐poly(methyl acrylate) (PMA) blends increase with aging time. The Tg versus log(time) plots are straight lines whose slope values depend on the head to head (H–H) defect content of PVF2 samples and on the composition of the blends. The values of polymer–polymer interaction parameters (χ) increase with an increase in the H–H defect of PVF2 for a fixed composition of the blend. Consequently, the Tg of the blend decreases with an increase in the H–H defect of the PVF2 sample. However, after aging for longer times this decrease of the Tg with H–H defects is lower than those of the unaged blends. The possible reasons are discussed. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1541–1548, 2001 |