Hydrophilic and hydrophobic polymers

The "catch-22" of these systems is their dependence on liquid water as the working fluid. In contact with water, hydrophobic and hydrophilic polymer constituents self-organize into phase-segregated random structures that... 

Another system was based on a swelling core tablet and a surrounding coating consisting of a combination of hydrophobic and hydrophilic polymers. The insoluble hydrophilic polymer, such as calcium pectinate or calcium alginate, was dispersed in the coating and served as a channel-former in order to control the water penetration. The core contained a swelling, but... 

Reza MS, Quadir MA, Haider SS. Comparative evaluation of plastic, hydrophobic and hydrophilic polymers as matrices for controlled-release drug delivery. J Pharm Pharm Sci 2003 6(2) 282-291. 

Recent experiments indicate that polymers that contain a balance of hydrophobic (nonpolar) and hydrophilic (polar) chemical groups show minimal protein adsorption and cell adhesion (6). With the intent of rationally designing a contact lens material that would minimize protein adsorption, the adsorption of lysozyme, albumin, and immunoglobulin G (IgG) to a series of hydrophobic and hydrophilic polymers and copolymers was measured. The polymers ranged from 100% poly(methyl methacrylate) (PMMA) to 100% poly(2-hydroxyethyl methacrylate) (PHEMA). Adsorption varied significantly for each protein, as did the elutability of the proteins from the surfaces. 

This basic structure provides for considerable flexibility in the design of biomaterials, as described in a recent review [27]. By selection of the side groups on the polymer chain, both hydrophobic and hydrophilic polymers can be produced. Hydrophobic polyphosphazenes may be useful as the basis of implantable biomaterials, such as heart valves. The hydrophilic polymers can be used to produce materials with a hydrophilic surface or, when the polymer is so hydrophilic that it dissolves in water, cross-linked to produce hydrogels or solid implants. In addition, a variety of bioactive compounds can be linked to polyphosphazene molecules allowing the creation of bioactive water-soluble macromolecules or polymer surfaces with biological activity. 

It is clear from extant hydrophobic and hydrophilic polymers that a wide range of phosphine-containing monomers could be prepared. 

Mixed bmshes of hydrophobic and hydrophilic polymers grafted onto Au-NPs were also used as stabilizers for styrene droplets. Subsequent suspension polymerization of styrene led to PS particles with Au-NPs on their surface. Such raspberry particles might open new perspectives for superhydrophobic coatings with dual-size roughness. " ... 

Huang, Y., Ly, J., Nguyen, D., Baker, R. W. (2010). Ethanol dehydration using hydrophobic and hydrophilic polymer membranes. Industrial and Engineering Chemistry Research, 49, 12067-12073. 

Self-processes are inherent in the self-assembly of copolymers. These are composed of chemically or physically incompatible units along the same macromolecule, such as polar/hydrophobic monomers or rigid/flexible polymer segments, respectively. The most widely investigated self-assembling copolymers are amphiphilic hnear block copolymers. The chemical incompatibility between covalently linked hydrophobic and hydrophilic polymer segments drives the organization of the macromolecules into... 

Along with the hydrophobic effect, micelle formation is further guided by the volume ratio of the hydrophobic and hydrophilic polymer domains. Through these principles, it is possible to synthetically engineer soft matter to organize into various nanoscale morphologies that can be precisely tuned as a result of the chemical control provided by, in this particular discussion, a well-defined ROMP catalyst [22,26]. 

POLYHYDROXYBUTYRATE ON PROPERTIES OF COMPOSITION FILMS ON THE BASIS HYDROPHOBIC AND HYDROPHILIC POLYMERS... 

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