Evidence of electron acceptor ‐ electron donor interactions in thermoplastic polymer blends by using FTIR ‐ ATR spectroscopy

摘要

AbstractSpecific interactions in binary blends of ethylene/vinyl acetate copolymer (EVA) with various low molecular weight terpene‐phenol tackifying resins (TPR) were systematically investigated, as a function of the composition of the blend and of the electron‐acceptor ability of the resin, by using attenuated total reflection‐Fourier transform infrared (ATR‐FTIR) spectroscopy. Molecular acid‐base were evidenced between TPR hydroxyl groups and EVA carbonyl groups. Quantitative information on the fraction of acid‐base bonded entities, the enthalpy and the equilibrium constant of pair formation were obtained. A crystalline transition of the EVA copolymer is observed and is discussed in terms of enthalpy and entropy considerations based on FTIR and calorimetric differential scanning calorimetry (DSC) investigations. Fundamental results are then summarized in order to predict the interfacial reactivity of such polymer blends towards acid or basic