Preparation of plasticized PVC coatings with low matter transfers by using n-pentane

✍ Scribed by A. Senoune; J.M. Vergnaud

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 309 KB
• Volume: 28
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(92)90195-8

✦ Synopsis

When plasticized PVC is in contact with a liquid, two matter transports may take place: the liquid enters the PVC, thus enabling the plasticizer to leave. The drawbacks are thus observed, with pollution of the liquid, and alteration of the mechanical properties of the polymer. A process has been developed in order to reduce these matter transports. The two step method consists of: (i) immersing the PVC sample in a liquid for a short time, creating thus two profiles of concentrations of the liquid and plasticizer next to the surface; and (ii) evaporating the liquid which has entered the PVC during the first step. At the end of the process, a profile of plasticizer is created next to the PVC surface with a low concentration on the surface. This plasticized PVC exhibits low matter transport when immersed in a liquid, as the process is controlled by diffusion with concentration-dependent diffusivity. In the present study, a rather volatile hydrocarbon such as n-pentane is used for the first step of immersion because it is easy to remove by evaporation.