Journal
PROGRESS IN ORGANIC COATINGS
Volume 122, Issue -, Pages 154-158Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2018.05.015
Keywords
Can coating; Bisphenol A non-intent; BPA-free; Solid-state C-13-NMR; Polyester-phenol blend; Polymer network structure
Funding
- German Federal Ministry of Economic Affairs and Energy via AiF (IGF project) [18454 N]
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Facing recent controversial debates about commonly used epoxy resins in food contact applications, an understanding of newly developed polyester-based BPA-non-intent (BPA-NI) interior food can coatings is necessary. So far, little is known about the polymer structure of the polyester-based blends which have been brought to the European market. We report a detailed study on a polyester-phenol blend model system suitable for interior can coating in terms of its mechanical properties such as high flexibility, very good adhesion and hardness. We employ vibrational spectroscopy (FTIR), thermoanalysis (DSC) and an in-depth high-resolution solid-state C-13-NMR analysis to reveal that an overall homogeneity on molecular scale of the two main components in the blend is sustained in the solid state. This is remarkable, taking into account the overall different characteristics of polyesters and phenolic resins and explains the exceptional material properties of this coating.
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