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Deflection of the sample 0.3PLA WPL15 (m = 0.2) (a) and sample 0.3PLA WPL25 (m = 0.2) (b) from the initial position to 6 h (middle red dot) and at the end of humidification process (right red dot) (168 h at humid climate of 80% RH and 20 °C).
