Plasma Polymerization Of Acrylic Acid Research Articles

Surface properties and platelet adhesion characteristics of acrylic acid and allylamine plasma‐treated polyethylene

AbstractAcidic oxygen‐containing and basic nitrogen‐containing functional groups were incorporated onto thin films formed by plasma polymerization of acrylic acid and allylamine in a lowpressure glow discharge. ESCA, ATR–FTIR spectroscopy, and static contact‐angle measurements confirmed the presence of these functional groups. Surface hydrophilicity of the acrylic acid plasma polymer decreased with time due to the diffusion of hydrophilic oxygencontaining functional groups away from the surface of the plasma‐treated polyethylene. In contrast, the hydrophilicity of the allylamine plasma polymer increased with time because of the extensive post‐plasma‐treatment oxidation with atmospheric oxygen. In assessing the blood compatibility of these two types of plasma polymer surfaces by platelet adhesion and spreading, the acidic acrylic acid plasma polymers showed an improvement in thromboresistance, but the basic allylamine plasma polymers were more thrombogenic than was the untreated low‐density polyethylene base material. © 1993 John Wiley & Sons, Inc.

Membranes for biomedical applications: Utilization of plasma polymerization for dimensionally stable hydrophilic membranes

Plasma polymerization techniques were utilized in the development of hydrophilic composite membranes having high hydrogen ion permeability and excellent dimensional stability. These membranes were prepared by using plasma polymerization of acrylic acid on porous polypropylene (PPA/PP) and plasma-initiated interpenetrating polymer network (IPN)-type polymerization of acrylic acid in porous polypropylene (PIPA/PP IPN). Hydrogen ion permeabilities of these membranes were determined. A hydrophilic composite membrane with high hydrogen ion permeability of acrylic acid polymer and excellent dimensional stability and mechanical strength of porous polypropylene was developed based on plasma IPN technique.

Influence of geometric factors of the substrate on hydrophilic surface modification of polyurethane sponges by plasma treatment

The surface modification by plasma treatment occurs by consecutive processes of excitation of gas(es) and deexcitation of excited species. The deexcitation occurs primarily at the surface yielding chemical modification of the surface (nonpolymer-forming plasmas) or deposition of material (polymer-forming plasma) on the substrate surface. Because of this sequence, geometric factors of the substrate in relation to the surrounding plasma phase have crucial influence on the effectiveness of plasma treatments. Simple mathematical models were developed to illustrate the effect of geometric factors involved in plasma treatments, and experimental results obtained with porous polyurethane sponges in various sizes were examined by the mathematical models for both plasma treatments by O2, H2O, and NH3 and plasma polymerization of acrylic acid.

Preparation of carboxylate groups-containing thin films by plasma polymerization

Plasma polymerization in a mixture of acrylic acid and carbon dioxide (CO2) gas was investigated. The polymer deposition rate in plasma polymerization of acrylic acid increased by admixing CO2 gas, and polymers containing carboxyl groups were formed. The amount of carboxyl groups alterable to carboxylate anions by treating with 0.1 N KOH solution or NH3 gas reached twice of that formed in plasma polymerization without CO2 gas.