Poly hydrophilic monomers grafting

When plasma polymers of hydrophilic monomers were deposited or the surface of LDPE grafted with hydrophilic poly(acrylic acid), the dielectric breakdown occurred in a very short time. These observations indicate that hydrophilic sites act as the gate for salt intrusion. Since the bulk properties of LDPE are believed to be unchanged with these surface modifications, the quick failure can be interpreted as the consequence of an interfacial phenomenon. The population of the potential salt intrusion sites is a very important factor that ultimately determines the breakdown of the insulation occurring in the presence of salt and electrical stress. 

The y irradiation of poly(ethylene) leads to a cross-linked product with increased heat stability which is especially useful for foam material and for bottles and other containers. Irradiation in the presence of hydrophilic monomers such as acrylamide leads to grafting the surfaces thus obtained are more suitable for printing. 

Yamada, K., Ebihara, T., Gondo, T., Sakasegawa, K. and Hirata, M. 1996. Membrane properties of porous and expanded poly(tetrafluoroethylene) films grafted with hydrophilic monomers and their permeation behavior. 

Grafting of Hydrophilic Monomers to Poly(ether-urethanes)... 

This method uses a hydrophobic polymer with sufficient water and solvent resistance as the main chain to which hydrophilic monomers are chemically grafted by a catalyst, light or radiation. The polymer will be insoluble in water yet its electrical resistance is moisture dependent. This graft copolymer will be used for the sensor. As for the hydrophobic polymer, poly(tetrafluoroethylene)(PTFE) film or a porous poly(ethylene)(PE) film... 

Jimbo, T., Tanioka, A., and Minoura, N. (1998). Comparison of surface charge and net charge densities of poly(aciylonitrile) membrane grafted with ionic monomers Hydrophilic and hydrophobic effects of graft chain. J. Colloid Interface Sci. 204, 336. 

Janssen et al. [144] focused their work on ozonization of polyvinyl lactam, grafting with hydrophilic methacrylic monomers for applications in the field of contact lenses and other products used in the medical domain. The most studied polymer remains the poly-N-vinyl pyrrolidone which is ozonized either in solid state or in aqueous solution. This activation step leads to three hydroperoxides per chain but also to chain scissions. The resulting product is formulated with different mixtures of methacrylic and dimethacrylic monomers to graft them onto activated polymer by UV initiation. Using dimethacrylic monomers lead to perfect cross-linked polymers presenting excellent resistance to solvents. Unfortunately, the mechanisms of action of ozone onto polyvinyl lactams do not seem to have been studied in detail. 

Low-temperamre plasma-induced grafting modifications of ultrafiltration membrane to yield hydrophilic nanofiltration membranes. In an investigation by Zhao et al. [52], preparation of hydrophilic nanofiltration membranes has been successfully accomphshed using a procedure consisting of plasma irradiation and subsequent grafting in gas of acrylic acid monomers on poly(acrylonittile) UF membrane. 

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