Corona discharge treatment route for the grafting of modified β-cyclodextrin molecules onto cellulose

Polyester Composites Reinforced with Corona-Treated Fibers from Pine, Eucalyptus and Sugarcane Bagasse

“…Additionally, corona discharge treatment is thought to activate the molecules at the surface, producing many activated sites along the polymeric chains of the fiber. The size and number of micro-pits increased with treatment time [36]. Thus, the roughness of the corona-treated fiber tends to increase as already reported by Zheng et al [63] on polymeric materials.…”

“…Therefore, the chemical treatment and the corona discharge seems to have degraded the cellulose chains, as also reported by Uehara and Sakata [31] that showed evidence of chemical changes and chain scission of cellulose by corona treatment. A decrease in the fiber tenacity was observed with increasing of corona energy level and time of exposure [16,36,59]. Sakata et al [40] reported on the oxidation of hydrophilic constituents of the surface of different types of wood through corona treatments.…”

“…graft polymerization of vinyl monomer or ethylene imine to wood) [31,32]. Corona discharge is generally used to improve wettability, adhesion, hydrophilic properties [25,33] or to graft molecules on polymeric surfaces [34][35][36]. Compared to chemical routes, polymer (that includes lignocellulosic materials) activation by corona discharge proffers many advantages: high efficiency and economic feasibility [37]; environmental acceptability as an eco-friendly, solvent-free process with the flexibility for application as a continuous process [36]; modificaction of surface properties without affecting bulk properties [38], can be performed under different atmospheres [36], and allows a large range of species to be grafted [35,39].…”

Surface modification using self‐assembled layers of amphiphilic cyclodextrins

“…are used in order to functionalize surfaces with CDs. A common feature of these methods is the very long production time, ranging from a couple hours to several days, depending on the amount of coat desired on the surface, excluding drying time. Dip‐coat technologies have been reported which result in a layer‐by‐layer build‐up, somewhat similar to the technology of this work.…”

“…are used in order to functionalize surfaces with CDs. A common feature of these methods is the very long production time, ranging from a couple hours 9,11,12,22 to several days, 2,10,13 depending on the amount of coat desired on the surface, Figure 5. A schematic representation of one of the hypothesized structure of the amphiphilic CD coat.…”