The water absorption for PVBI 50/45/5 appeared to maintain an increasing trend (>~5% w / w after 40 d) ( Figure 5 ), which was attributed to the low T g value of the copolymer ( T g = 40.0 °C).
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Composition-Property Relationships of pH-Responsive Poly[(2-vinylpyridine)-co-(butyl methacrylate)] Copolymers for Reverse Enteric Coatings.
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