Plasticizing agent, effectiveness

Brauer, Stansbury Flowers (1986) modified these cements in several ways. The addition of various adds - acetic, propionic, benzoic etc. -accelerated the set. The use of zinc oxide powders coated with propionic add improved mixing, accelerated set, reduced brittleness and increased compressive strength from 63 to a maximum of 72 MPa. The addition of plasticizing agents such as zinc undecenylate yielded flexible materials. Incorporation of metal powders had a deleterious effect and greatly increased the brittleness of these cements. The addition of fluorides was not very successful, for fluoride release was not sustained. 

Schultz (7) has studied the methyl methacrylate polymerization, which is interesting to compare with effects noted in the poly (vinyl chloride)-styrene graft polymerization. When his polymerizations were carried out well below the glassy transition temperature, the conversions reached limiting values. Monomer present in the system functioned as a plasticizing agent, allowing polymerization to occur up to the point... 

To be effective, a plasticizer must partition from the solvent phase into the polymer phase and subsequently diffuse throughout the polymer to disrupt the inter-molecular interactions.The rate and extent of this partitioning for an aqueous dispersion have been found to be dependent on the solubility of the plasticizer in water and its affinity for the polymer phase. The partitioning of water-soluble plasticizers in an aqueous dispersion occurs rapidly, whereas significantly longer equilibration times are required for water-insoluble plasticizing agents. For aqueous-based dispersed systems, water-insoluble plasticizers should be emulsified first and then added to the polymer. Sufficient time must be allowed for plasticizer uptake into the... 

As mentioned before, addition of plasticizing agents, which decrease the viscosity, into polymerization medium increase the rate of polymerization. This effect was observed in photoinitiated cationic polymerization of epoxides in the presence of epoxidized soybean oil [133],... 

J. Gassan and A.K. Bledzki. Dynamic-mechanical properties of natural fiber-reinforced plastics the effect of coupling agents. In Fourth International Conference on Woodfiber-Plastic Composites, Madison, WI, May 12-14, 1997, pp. 76-80. 

LINEAR COEFFICIENT OF THERMAL EXPANSION-CONTRACTION FOR WOOD-PLASTIC COMPOSITES. EFFECT OF FILLERS AND COUPLING AGENTS... 

Effect of water and non-volatile plasticizing agent on the behavior of plasticized starch... 

Certain authors have shown that at low concentrations of non-volatile plasticizing agent, an antiplasticization effect can occur [LOU 97a]. Because of the strong interactions between the plasticizing agent and the starch, a network of... 

Uses Coalescing agent tor surface coatings solvent tor acrylic and vinyl acetate copolymers plasticizer presenrative effective against a variety of microorganisms... 

An additional form of very effective plasticization can be made to occur in crazable glassy polymers by the pre-packaging throughout the volume of small concentrations of diluents that act effectively as plasticization agents, by wetting craze borders where plasticity is concentrated, without affecting other parts of the matrix by impairing transparency or stiffness. 

Figure 4.11 Effect of the cross-linkin plasticizing agent on the internal stress concentration (K is the concentration coefficient) at the edges of the adhesive-bonded joints...

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