Tailoring polymer molecules

Tailoring Polymer Molecules for Specific Fiber and Ribbon Properties... 

Comonomers can be used to create a variety of polymer stmctures that can impart desirable properties. For example, even higher molecular weight PPS polymers can be produced by the copolymerization of a tri- or tetrafunctional comonomer (18). The resultant polymer molecules can have long-chain branching, which can be used to tailor the rheological response of the polymer to the appHcation. 

Acustom polymeric dispersant is an improvement—the polymer molecule is tailored to the pigment and to the application. There are dozens of patents from companies such as Canon, Epson, KAO, DIG, DuPont and others describing the synthesis and use of custom pigment dispersants for IJ. Some of them are very complex, involving such techniques as grafting and block co-polymerization. For example, some DuPont patents describe a dispersant based on a diblock co-polymer A-B or triblock co-polymer A-B-A where block B has an affinity for the pigment, whereas block A is responsible for colloidal stabilization. ... 

Control of the micelle size utilized in the formation of PAn nanoparticles has been achieved by tailoring the stabilizer to modify the resulting micelle dimensions. Kim and coworkers215 216 used amphiphilic polymer molecules and hydrophobically end-capped polyethylene oxide) [PEO], and varied the hydrophilic regions in it to control the final micelle size. The resultant nanostructures ranged from 20 to approximately 300 nm in size, depending on the molecular weight of the hydrophilic PEO midsection. 

Introduction to chemical phenomena and their applications cohesion, particles, crystals, tailoring big molecules, chemist as architect, with applications in radioactivity, color photography, synthetics, biochemistry, polymers, and many other important areas. Non technical. 95 figures, x 4. 299pp. 5% ... 

The phase separation of thin polymer blend films can be also driven by substrate effects, including the effects of (i) the substrate composition (ii) the substrate functionalization and/or (iii) the substrate structures. In particular, the self-assembly of polymer molecules on a substrate can be controlled by selectively modifying the chemistry of the substrate surface and/or the polymers to create patterned polymer films with tailored length scales. 

A gel that is commercially available has the trade name ELAMUS. It is made of a hydrogenated styrene-butadiene block copolymer that is synthesized by solution polymerization. It is swollen by a liquid plasticizer. To maintain shape, a crosslinked structure resembling that of human tissue is formed (see Fig. 4) [5]. The characteristics of this gel are that even if the same polymer main chain is used, various properties can be tailored by changing the low molecular weight material that swells the polymer. By selecting appropriate compatibility and miscibility to allow the polymer molecules to be mobile, gel properties can be tailored. 

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