Study On Atmospheric Low Temperature Plasma Modification Of PTFE: Surface Grafting Polymerization And Surface Adherence Improvement

It is of great importance to improve the PTFE surface properties, including the adherence property, in the fabrication of large sized PTFE apparatus. However, normal surface treatment methods either need complicated processes or expensive equipments, or may contaminate the products.In this work, atmospheric low temperature plasma (ALTP) technique was employed for its relatively mild experiment condition to treat the PTFE surfaces. Using the ALTP modification, the spreadability of alcohol, acrylic acid (AA) and 2-hydroxyethylmethacrylate (HEMA) on PTFE surfaces were greatly improved. ALTP induced surface grafting polymerizations of AA and HEMA were then performed on the ALRP treated PTFE surfaces. FTIR and surface water contact angle tests were used to evaluate the effect of plasma induced graft polymerization on PTFE. Furthermore, the adhesion properties of the modified PTFE was tested, and the crack section of the adhered surfaces were carefully studied by SEM.