Oxidation of low-density polyethylene film with aqueous chromic acid results in a material (PE-CO2H) having hydrophilic carboxylic acid and ketone groups in a thin oxidatively-functionalized interface. This interface is indefinitely stable at room temperature. On heating in vacuum, it rapidly becomes hydrophobic and similar in it wettability to unfunctionalized polyethylene film. The progression of the contact angle with water from the initial value (55) to the final value (103) follows ...
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