Compatibility polymer

I. C. Sanchez in K. Sole, ed.. Polymer Compatibility and Incompatibility Principles and Practice MMl Press Symposium Series, Vol. 2, Harwood Academic... 

Protection of polymers against thermal and photo-oxidative degradation is achieved with appropriate stabilizers that ensure the desirable polymer properties throughout the entire service life of the polymer. Compatible and polymeric stabilizers usually give the best protection. In order to avoid migration and evaporation, polymeric stabilizers are used. 

There are many definitions of polymer compatibility. On one hand, compatible polymers are the polymer mixtures that have desirable physical properties when... 

Plastics and Polymers, Compatibility with Explosives. See refs 10, 25, 32 33 under PLASTEC in this Vol... 

The same procedure has been employed to increase the hydrophobic character of cellulose, by introducing fluorine-containing groups, e.g., 2,2-difluoroethoxy 2,2,2-trifluoroethoxy and octafluoropentoxy. Incorporation of hydrophobic moieties into cellulose is expected to increase the polymer compatibility with other materials, e.g., synthetic polymers. Note that an important part of incompatibility is due to the highly hydrophilic character of cellulose. Decreasing this character is expected to affect Tg of the derivative, as shown by cellulose propionate/octafluoropentoxy acetate (total DS = 3.0, partial DS in each moiety = 1.5), whose Tg is only 53 °C. The products are more stable than their fluorine-free counterparts, and the terminal CF2 - H group affects Tg much less than OH-substituted trifluoroethoxy celMose derivatives [196,197]. 

FIGURE 2.5 Structure of a typical polymer-compatible hydrophobic block. 

The low-tension polymer flood technique consists of combining low levels of polymer-compatible surfactants and a polymer with a waterflood. This affects mobility control and reduces front-end and total costs. [929]. 

The advent of synthetic polymers was of special significance since the water soluble inorganic salts defined up to that time were of little or no utility in these largely hydrophobic materials. Modern developments therefore were concentrated on the development of polymer compatible permanent fire retardants. Although a multitude of individual products have since been developed, Table II attempts to list the most significant developments with the largest impact on the direction of fire retardant chemistry. 

Light produced during welding is extremely harmful to the eyes, and to offer full protection to the worker, radiation from the near-IR needs to be eliminated, whilst still allowing the wearer to see clearly. Polymer compatible diiminium and nickel dithiolene near-IR absorbers have been developed for this outlet, and also for the protection of the eyes of users of higher-powered lasers. Wide attenuation of light... 

Eriksson M, Notley SM, Pelton R, Wagberg L. The role of polymer compatibility in the adhesion between surfaces saturated with modified dextrans. J Colloid Interface Sci 2007 310 312-320. 

The types of water-soluble polymers used for the thickening cement slurries, mortar and concrete are shown in Table 6.6. Although many polymers shown in Table 6.6 can be used to increase the viscosity of the water in the mix, they are not all pseudoplastic polymers compatible with cement systems. Only a few can be consistently combined with water-reducing admixtures (WRAs) and superplasticizers to produce concretes with cohesive yet highly flowable mixtures [40, 41, 43]. 

Solvent-polymer compatibility problems are often encountered in industry, such as in the selection of gaskets or hoses for the transportation of solvents. A rough guide exists to aid the selection of solvents for a polymer, or to assess the extent of polymer-liquid interactions. A semi empirical approach has been developed by Hildebrand based on the principle of like dissolves like. The treatment involves relating the enthalpy of mixing to a solubility parameter, S, and its related quantity, 8, called the cohesive energy density. 

Sole K (ed)(1982) Polymer compatibility and incompatibility principles and practices. Harwood Academic... 

Thus, it has been shown [34] that in solution of linear polymers compatible with the network polymer the discrete decollapse can be realized even for the... 

In order to counteract the effect of water absorption in the interphase region, hydrophobic substituents were added to the coupling agent [5]. Methyltri-methoxysilane G, vinyltrimethoxysilane A, and 3-chloropropyltrimethoxysilane B are good sources of hydrophobic character, but phenyltrimethoxysilane I gives a good combination of hydrophobic character, thermal stability, and polymer compatibility. 

This unusual compatibility between homopolymers which can be readily characterized opens the way for studying the criteria of polymer compatibility in more detail. Other aspects, such as the observed melting... 

Figure 3. Ultrathin cross sections of OsO, -stained two-stage (S//S-B) latex particles at the stage ratio of 20/80 showing the effect of polymer compatibility ((A) 30 parts butadiene (LS-7) (B) JO parts butadiene (LS-8) and (C) 5 parts...

The morphology of two-stage (styrene//styrene-butadiene) and (styrene-butadiene//styrene) latex particles was found to vary from a core-shell structure to a complete phase separation with various two-phase structures in between, depending on polymerization sequence, polymerization conditions, polymer compatibility, molecular weights, polymer phase ratio, etc. 

PVDF can be coextruded and laminated, but the process has its technical challenges in matching the coefficients of thermal expansion, melt viscosities, and layer adhesion. Special tie-layers, often from blends of polymers compatible with PVDF, are used to achieve bonding.26-27... 

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