Poly , hydrophobic modification

Thuresson K, Nilsson S, Lindman B. Effect of hydrophobic modification on phase behavior and rheology in mixtures of oppositely charged poly electrolytes. Langmuir 1996 12 530-537. 

As seen from the above examples, most of these hydrophobe modification processes involve introducing a hydrophobe onto a water soluble polymer (WSP) backbone. However, Bock and Valint [30] have reversed the process they have added solubilizing ionic moieties to a hydrophobic block copolymer, poly(t-butylstyrene-h-styrene), backbone by selective sulfonation of the polystyrene block (Scheme 1.5). The resulting material is a novel hydrophobically associating block copolymer. 

Jin, Z., D.L. Yang, S.H. Zhang, and X.G. Jian. 2008. Hydrophobic Modification of Poly(phthalazinone Ether Sulfone Ketone) Hollow Fiber Membrane for Vacuum Membrane Distillation. Journal of Membrane Science 310(1/2) 20-21. doi 10.1016/j. memsci.2007.10.021. 

This chapter describes another possible way to facilitate the transport of poly(MA-CDA) into cells. The process involves enhancement of the membrane affinity by hydrophobic modification of poly(MA-CDA). This concept was derived from the fact that there are biological modifiers (BRMs) on the bacterial cell surface. Figure 4 shows the structure of a typical BRM, lipo-polysaccharide (LPS) from a gram-negative bacteria, which is a negatively... 

Given the results shown in Figs. 9 and 10, significant changes in superoxide production were effected by increasing the hydrophobic character of poly(MA-CDA). The alkyl (hexyl) modification appears to be more effective than an aromatic (aniline) modification. The hydrophobic modification may be an efficacious way to improve the immunostimulating activity of poly(MA-CDA) [26-28]. 

Especially, MA-CDA-5K-A, which was derived from the hydrophobic modification of poly(MA-CDA) (Mw = 5300) with 10 mol% of aniline, induced remarkably higher concentrations of both cytokines than those of unmodified and modified poly(MA-CDA)s with different molecular weight... 

Preparation of polyfethylene oxide) (PEO) and poly(arylene ether) based hydrophilic-hydrophobic block copolymer is of special interest because PEO has been proven to be particularly reliable and versatile for the surface modification of biomaterials. The first poly(ediylene oxide)-/ /oc/c-polysulfonc (PEO-fc-PSF) copolymers were reported by Aksenov et al.217 They employed diisocyanate chemistry to link hydroxy-terminated sulfone oligomers and polyfethylene... 

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