Butyl acetate solubility parameter

Figure 3.27 Dependence of equilibrium swelling on the solubility parameter in a number of solvents (I) diethyl ether (11) diethylene glycol diethyl ether (III) butyl acetate (IV) ethyl acetate (V) tetrahydrofdran (VI) dioxane. Polyurethane networks based on PTMG and PPG mixture without additives (4) and containing various KEP-2 mass fractions (1) 1.5 x 10 (3) 5 X 10- (2) 7.5 X 10- (5) 1.5 x 10 ...

Solvent MW (g/ mole) BP (°C) Evaporation Rate (Relative to n-Butyl-acetate) Surface Tension (mN/m) Hydrogen Solubility Parameter (MPa)i/2 Polar Solu- bility Para- meter (MPa)i/2... 

Table 7.5 lists the eleven minimum boiling-point azeotropes formed between the alcohols and water. While Table 7.6 lists many of the alcohols in terms of descending evaporation rates where the standard solvent is /i-butyl acetate with an evaporation rate of 1.0. The solvent s boiling points and Hansen solubility parameter values are also listed so as to enable a comparison of both a solvent s relative evaporation rate and solvency for a resin or polymer. This list can also be used to find a substitute solvent with properties similar to a solvent that should be replaced. These comparisons can also be made with one of the computer data files discussed in Chapter 19. 

The Dow Chemical Company has a solvent related computer program, Chemcomp, which simulates evaporation profiles for solvent blends. Other features include the ability to measure the effects of humidity on evaporation, calculation of the Hansen solubility parameters for the solvent blend, and inclusion of data on the relative rate of evaporation of the blend at 90% as compared to a standard n-butyl acetate being equal to 1.0. More information on Chemcomp and related solvent modeling computer programs can be obtained from Dow at 1-800-258-2436... 

Another method involves excimer fluorescence as a molecular probe see Section 2.9. The question may be raised as to whether polymer blends will become more miscible if the differences in their solubility parameters are reduced. Excimer fluorescence provides some evidence see Rgure 4.14 (52). Here, 0.2 wt.% of poly(2-vinyl naphthalene), P2VN, is dispersed in a series of poly (alkyl methacrylates). These include the following, which are identified in Figure 4.14 by acronym methyl, PMMA ethyl, PEMA n-propyl, PnPMA isopropyl, PiPMA n-butyl, PnBMA isobutyl, PiBMA . yec-butyl, PsBMA ferf-butyl, PtBMA phenyl, PPhMA, isobomyl, PiBoMA benzyl, PBzMA and cyclohexyl, PCMA. Two other host polymers were polystyrene, PS, and poly(vinyl acetate), PVAc. 

Interaction parameters, Xi2> of all pure biodegradable polymers-solute and some blends-solute systems were calculated using Equation (8). Table III shows the values of Xi2 for selected solutes. Only alkanes and alcohols were used for X23 calculations, other solutes could not be used due to the lack of Antoine constants in the literature. Generally, X12 showed more exothermic values as a number of carbons (n) in both alkane, acetate and alcohol series increased. Dodecane, butyl acetate and butanol showed the most exothermic values among alkanes, acetates and alcohols. Values of X12 become more exothermic as temperature increased as expected. The exothermic values are indicators for the solubility of these polymers in solutes. The dispersive forces among the three Emilies played a major role in determining the solubility. 

The role of solvents is to reduce the viscosity of adhesives and to improve fluidity. That can provide the adhesives wettability to create an intimate contact with the surface of adherends. Solvents must be able to dissolve the components of adhesives. Solubility parameter is an index to show the soliditivity of solvents. A solvent can dissolve a high amount of materials whose solubility parameters are close to that of the solvent. Water, alcohols, aromatic hydrocarbons (e.g., toluene and xylene), ketones (e.g., methyl ethyl ketone and cyclohexanone), acetate esters (e.g., ethyl acetate and butyl acetate), n-hexane, cyclohexane, methylene chloride are used due to their solubility, dehydration rate, noncombustibility, and workability. To meet the demands concerning environmental issues, the use of some solvents such as toluene, xylene, ethylbenzene, and styrene is restricted bylaws such as the air pollution control law legislated by Ministry of the Environment in Japan (The Ministry of the Environment 1996). 

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