PSFQ

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In this context, the performance of a bactericidal polymer is measured by its ability to strike the balance between microbicidal and biocompatible properties, maximizing the selectivity of the material [62], Therefore, the bioactivity dependence on the pendant chain size of quatemamized polysulfones (PSFQ), allowing establishment of a structure-bioactivity relationship, was investigated against Pseudomonas aeruginosa (P.
Contact angle Code Polymer/solvent mixtures W G EG 1-Bn 1 PSF in DMF 79 70 60 34 2 CMPSF 1 in DMF 73 72 57 30 3 CMPSF2 in DMF 71 68 52 29 PSFQI/DMF/MeOH 4 100/0 DMF/MeOH 70 67 58 29 5 60/40 DMF/MeOH 68 64 56 27 6 20/80 DMF/MeOH 62 61 50 25 PSFQ 1 /DMF/water 7 60/40 DMF/water 61 58 51 27 8 40/60 DMF/water 57 55 49 21 PSFQ2/DMF/MeOH 9 0/100 DMF/MeOH 62 60 51 26 10 40/60 DMF/MeOH 58 56 49 24 11 80/20 DMF/MeOH 54 52 43 22 PSFQ2/MeOH/water 12 60/40 MeOH/water 57 55 48 23 13 20/80 MeOH/water 54 51 44 19 TABLE 4.
This changing trend in morphology is due to the modification of chain conformation of PSFQs, influenced by the quality of the mixed solvents [25].
The general chemical structure of the PSFQ is presented in Scheme 1.
The hydrogen bonding and the electrostatic interactions are reciprocally influenced and are dependent on the mixed solvent composition and on PSFQ charge density.
The conformational behavior in solution and the experimental and theoretical results on the preferential adsorption coefficients versus solvent's composition have been discussed in correlation with the interaction parameters of quaternized polysulfones (PSFQs)/mixed solvents, on neglecting the association phenomena between the polar groups of the components (14), (15).
The characteristics of the obtained PSFQs are listed in Table 1.
Equilibrium dialysis experiments of the PSFQs (3) in DMF (1)/water (2) and MeOH (1)/water (2) mixed solvents were carried out in a dialyzer with a total volume of about 15 mL.
where [v.sub.3] is the partial specific volume of PSFQs, [V.sub.1] and [V.sub.2] are the molar volumes of solvents (1) and (2), and s = [V.sub.1]/[V.sub.2], the molar volume ratio of solvents.