Improvement of Polypropylene Properties by Irradiation / Grafting and other Modifications.

Abstract

P OLYPROPYLENE (PP) is a cheap fabric, bearing chemical resistance and excellent mechanical properties. PP is hydrophobic in nature, inactive synthetic fabric due to the absence of reactive functional groups in the molecular structure, thus preventing its dyeing. For this reason, PP fibers are modified by irradiation methods to form free radical centers onto the surface and graft copolymerization of selected vinyl monomers. Different irradiation techniques are adopted involving plasma discharge, electron beams, ozone, UV, γ-rays and others. PP is grafted with selected monomers including methacrylate derivatives such as (2N-Dimethyl amino ethyl methacrylate, 2N morpholino ethyl methacrylate, 2-ethyl methacrylate phosphoric acid, methyl methacrylate, 2-hydroxy ethyl methacrylate) acrylic acid, styrene, chloro methyl styrene, vinyl acetate etc... The different variable factors affecting irradiation and grafting reactions are considered such as irradiation dose, storage time of irradiated fabric, monomer concentration, reaction time and temperature. Physical properties of grafted and those containing tertiary amino quaternized groups are improved for increase of moisture regain, melting point and enhancement affinity to dyeing by different classes of dyestuffs. The important properties improvement include ion exchange capacity, electrical conductivity, antistatic, insect repellent activity antibacterial property. PP containing Ag, Zn, ZnO, TiO 2 , Cu, Cu 2 O nano particles are antibacterial fabrics which are used as wound healing dressings.

Antimicrobial Polypropylene Loaded by Cubic Cuprous Oxide Micro Particles

“…There is an increase demand for antibacterial PP fabrics especially those used in hospitals to prevent infection or transmission of diseases and protect health care workers. In this investigation, PP fabric is bearing chemical and excellent mechanical properties [31] but is lacking antimicrobial properties treated with Cu 2 O micro particles as antimicrobial agent, for medical and hygiene applications. The mechanism for the antimicrobial action of copper is known since, copper materials release ions in the presence of water and oxygen, forming complexes with the compounds present in the bacteria.…”

Preparation ,Characterization and The Biological Activity Study of A new heterocyclic (Azo-Schiff base) ligand and Their Complexation with {Co,Ni,Cu,Zn(II)}Ions

“…A metal surrounded by a cluster of molecule that is used for preparation of complexes named as Schiff's bases, which are produced from condensation of primary amines with aldehydes or ketones [1].Molecular recognition due to noncovalent interactions between two different molecules has become an important subject in areas of chemistry, biology and physiology. In particular, the selective binding via interactions such as hydrogen bonding and π-π aromatic stacking between the receptor and the neutral guest molecule has been known as the basis of the main concept in molecular recognition [2] . Heterocyclic phenazone and their derivatives (4-amino antipyrine) are known to act as tri dentate or tetra dentate ligands when coordinated to metal ion.…”

Characteristic properties of unmodified polypropylene fabrics dyed with pigment dyes in aqueous medium for medical uses

“…copolymerization of vinyl monomers and finally dyeing. Different irradiation techniques are used such as plasma discharge, electron beams, ozone, UV, γ-rays and others [1,2].…”

“…This method for dyeing PP fabric will prevent propagation of diseases in these medical places and the excess can be exported abroad. Polypropylene (PP) is a low price fabric, has chemical resistance and excellent mechanical properties [1]. PP is used in different hygienic and medical applications such as hospital uniforms, bed sheets, surgical masks, diapers, burns, wound healing dressings and hygiene bands.…”