By D. M. Brewis, I. Mathieson
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Additional info for Adhesion and Bonding to Polyolefins (Rapra Review Reports)
The solid hold-up in the plasma reaction zone mainly governs the stability of plasma glow and surface property of the powders. The hydrophobic surface can be transformed to hydrophilic of HDPE powder and the oxygen functionalities are formed including C=O and C(O)O-, which reach 12% and 8% respectively of the total carbon elements by the oxygen plasma treatment. 4 times to obtain the similar level of hydrophilicity compared to that in a bubbling fluidised bed based on the composite parameter. The present CFB reactor can be utilised to modify the polymeric surface from hydrophobic to hydrophilic with high-energy efficiency.
7 mm thickness, consisting of 32 alternating layers of PP and LLDPE, were produced and the peel strength measured over a range of speeds at room temperature. The metallocene system exhibited significantly higher levels of adhesion between the PP and the LLDPE compared to the Ziegler-Natta systems. This was attributed to the presence of a weak amorphous interfacial layer. 8 refs. 2881-7 SURFACE GRAFT POLYMERIZATION OF 2HYDROXYETHYL METHACRYLATE ONTO LOW-DENSITY POLYETHYLENE FILM THROUGH CORONA DISCHARGE IN AIR Jingxin Lei; Xia Liao Sichuan,University The active species produced on forming chemically active sites on low density polyethylene (LDPE) by atmospheric pressure corona discharge were used to induce copolymerisation of 2-hydroxyethyl methacrylate (HEMA) onto LDPE film in aqueous solution.
Polyacrylic acid (PAA) and poly(L-lysine) (PLL) are the initial targets. These polymers adsorb to FEP from water under conditions. A significant number of experiments is carried out to determine adsorption behaviour. The pH of the solutions is important for PAA and PLL, and these polymers should be more adsorptive at low and high pH pines, respectively. The effects of the ionic strength of solutions are also studied. Solution ionic strength is an important issue. Ions both increase the surface tension of water, increasing the FEP-water interfacial free energy, and screen repulsive interactions between ionic groups.
Adhesion and Bonding to Polyolefins (Rapra Review Reports) by D. M. Brewis, I. Mathieson