Novel, positively charged membrane from a blending, crosslinking, and coagulation procedure

Abstract

A novel, positively charged membrane was prepared through a blending, crosslinking, and coagulation procedure in which poly(N,N-dimethylaminoethyl methacrylate) (PDM) and polyacrylonitrile (PAN) were used as the functional and substrate component, respectively. Because 1,4-dibromobutane (DBT) was used as the crosslinker and quaternizing agent, PDM was crosslinked and quaternized simultaneously. The effects of PDM content, polymer concentration, and additive dosage of the casting solution on the membrane performances are discussed in detail, and differences between the PAN membrane, PDM/PAN blend membrane, and crosslinked PDM/PAN blend membrane are also discussed. We also studied the adsorption behaviors of the membranes to a positively charged dye and a negatively charged dye. Environmental scanning electron microscopy observation showed that the resulting positively charged membrane from such a blending, crosslinking, and coagulation procedure possessed a unique and uniform structure.

Combinatorial Materials Research Applied to the Development of New Surface Coatings XIII: An Investigation of Polysiloxane Antimicrobial Coatings Containing Tethered Quaternary Ammonium Salt Groups

“…Tethering (i.e., covalently bonding) QAS to a surface to achieve long-term activity has been previously investigated. − Surfaces coated with QAS-containing polymers have been shown to be very effective in killing a wide range of microorganisms such as Gram-positive and Gram-negative bacteria, yeasts, and molds. − Various material architectures such as self-assembled monolayers, polyelectrolyte layers, and hyper-branched dendrimers have been used to produce biocidal surfaces. − While surface tethered QAS moieties have been shown to exhibit antimicrobial properties, the mechanism of kill must be different than that described for QAS in solution because of diffusion limitations of tethered QAS. Kugler et al recently reported on the mechanistic aspects of tethered QASs and showed the existence of a charge-density threshold for surfaces bearing tethered QAS groups.…”

“…Tethering (i.e., covalently bonding) QAS to a surface to achievelong-termactivityhasbeenpreviouslyinvestigated. [13][14][15] Surfaces coated with QAS-containing polymers have been shown to be very effective in killing a wide range of microorganisms such as Gram-positive and Gram-negative bacteria, yeasts, and molds. [15][16][17] Various material architectures such as self-assembled monolayers, polyelectrolyte layers, and hyper-branched dendrimers have been used to produce biocidal surfaces.…”