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Malyhon

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Surface Wettability of Unmodified and Modified
PHBV Films. The surface wettability of different PHBV films
was investigated through a water contact angle method. The
contact angle of the PHBV film was found to be 72 ( 1. After
NH3 plasma treatment, the contact angle decreased to 36 ( 4
because of the increasing polarity and roughness of the surface
caused by the introduction of hydrophilic groups.21,22 However,
it was reported that within the first 3 h after treatment, the
contact angle increased significantly. After 1 day of storage in air,
the contact angle of theNH3 plasma-treated PHBV films reached
a value similar to that of an unmodified surface. The effect of
wettability reversal is likely due to chain relaxation processes and
postreaction with the storage environment.
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