Miscibility and crystallization behavior of poly(ethylene‐co‐vinylalcohol)/poly(maleic anhydride‐alt‐ethylene) blend

Abstract

The miscibility of poly(vinylalcohol‐co‐ethylene) (PEVA) with poly(ethylene‐alt‐maleic anhydride) (PEMAH) blends was investigated over a wide range of compositions by viscosimetry and DSC analyses using Krigbaum–Wall and Kwei approaches. The results revealed that the blends were completely miscible in all proportions due to the specific interactions between the hydroxyl groups of PEVA and the carbonyl groups of PEMAH. From Nishi equation, the interaction parameter of Flory was found to be −0.89. The nonisothermal crystallization behavior and kinetics of this system were also investigated and compared with those of the pure PEVA. There were strong dependencies of the degree of crystallinity (XT), peak crystallization temperature (Tp), half time of crystallization (t1/2), and Ozawa exponent (m) on PEMAH content and cooling rate. The crystallization activation energy (Ec) that was calculated from Kissinger model increased with increasing PEMAH composition in the blend. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Non Isothermal Crystallization Kinetics and Isothermal Decomposition of Poly(Ethylene-Co-Vinylalcohol/Poly(D,L-Lactic-Co-Glycolic Acid) Blend

“…In general, the crystallization enthalpy of PE-VOL in the blend shifted toward the low temperature with increasing cooling rate. Similar behavior was also observed in our previous investigations using poly(ethylene-co-vinyl alcohol)/poly(maleic anhydride-alt-ethylene) [56] and by Guo et al [57] using Poly(ε-caprolactone)/epoxy resin blend.…”