Graft-Polymerization Of N-Vinyl-2-Pyrolidone, Allylamine And Acrylic Acid Onto PVC Film By Plasma Treatments

Content Provider	Semantic Scholar
Author	Demirci, Nagihan Demirel, Miyaser Dilsiz, Nursel
Copyright Year	2015
Abstract	In this study, PVC films were modified by graft polymerization of N-vinyl-2-pyrolidone (NVP) , allylamine (AM) and acrylic acid to improve hydrophilicity for medical applications such as catheters, urological products and flexible tubes. The PVC films were immersed hydrophilic monomers and than were treated with NVP and AM plasma. Wettability of PVC films was investigated using contact angle measurement. Experimental results showed that the water contact angle values decreased from 116.4° for the uncoated PVC film to the lowest value 0° for the coated PVC film. Graft-polymerization by plasma treatment can be used to enhance hydrophilicity of PVC surfaces. Keywords—Plasma modification, graft polymerization, PVC film, hydrophilicity I.Introduction Polymers are commonly used in industry because of their excellent bulk properties, such as strength and good resistance to chemicals. Their surface properties are for most application inadequate due to their low surface energy. A surface modification is often needed, and plasma surface modification is used with success the past decades [1]. Surface modification techniques based on plasma processes allow to tune surface composition, morphology and properties of materials in several applications. Plasma processes are widely used for modifying the surface of materials in several fields, including that of biomaterials, being versatile tools to tailor smartly chemical and physical properties of material surfaces at room temperature, without altering their bulk. High versatility, adaptability to various substrates, minimum consumption of reagents, no use of solvents, up-scalability and high/easy integration in industrial processes are other advantages of the technique. The intrinsic sterilization of materials exposed to the highly energetic plasma environment is a feature that obviously attracts biomedical operators [2]. Plasma polymerization is a deposition technique where a gaseous or liquid monomer is introduced in the plasma discharge and converted into reactive fragments [3–6]. These can react with the surface to form a so-called plasma polymer coating, that has unique physical and chemical properties. These coatings are pinhole-free, highly cross-linked and are therefore insoluble, thermally stable, chemically inert and mechanically though. Often these films are highly coherent and adherent to a variety of substrates including conventional polymer, glass and metal surfaces [7]. In addition, plasma-graft polymerization has been frequently applied for hydrophilic surface modification of polymers. In plasma-graft polymerization involve two step. First step, a polymer is exposed to an adequate plasma such as argon plasma, nitrogen plasma or oxygen plasma for a very short time and then second step comes into contact with the vapor of a monomer or becomes immersed in the aqueous solution of a monomer at an elevated temperature [8]. At the previous works, vinyl monomers with hydrophilic groups like acrylic acid and acrylamide were used as monomers for plasma-graft polymerization [9-13]. These works showed that plasma-graft polymerization with vinyl monomers were enhanced the hydrophilicity of surfaces. In recent years, plasma surface modification for biomedical polymers has been investigated. For biomedical polymers, the surface properties need to be altered to promote a good cell adhesion, growth and proliferation and to make them suitable for implants and tissue engineering scaffolds [1,14]. Modification of polymer surfaces can be rapidly and cleanly achieved by plasma treatment due to the possibility of the formation of various active species on the surface of polyethylene (PE), poly(3hydroxybutyrate), polycaprolactone, polypropylene (PP), and polytetrafluoroethylene (PTFE), although plasma treatment is generally slow and expensive in fiber applications and has found only limited applications. Plasma treatment also results in deposition of a macromolecular structure, graft polymerization, functionalization, etching, roughening, and cross-linking. It has been used to enhance wettability of surfaces [15-23]. In this study, poly(vinyl chloride) (PVC) films were used as a substrate since PVC is employed in applications including generally preferred for medical devices such as catheters, urological products and Journal of Multidisciplinary Engineering Science Studies (JMESS)
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