Influence of Colorants

Most studies on crystallization have considered virgin polymers without additives. However, in many injection-molded products, various additives such as colorants are usually added and these are known to affect the crystallization behavior. The topic has been recently tackled by Hadinata et al. (2008), Zheng et al. (2008, 2010), Lee Wo and Tanner (2010), and Zhu et al. (2009). These authors investigated the FIC behavior of an injection-molded isotactic polypropylene (iPP) mixed 

To include the details of colorants in the numerical modeling is difficult, if not impossible. Tactically, in a practical computation, the basic kinetic model for materials with and without colorants can remain the same, while the model parameters should be carefully determined for each colored polymer such that the nucleation and growth trends are correlated with the colorant effects. 

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J. Walford, ed.. Developments in Food Colours, Vols. 1 and 2. Elsevier AppHed Science, London, 1980 and 1984. Includes chapters on synthetic and natral food colors used in the United States, and on the influence of color on the perception and choice of food. 

Sturaro A, Parvoli G, Doretti L, et al. 1994. The influence of color, age, and sex on the content of zinc, copper, nickel, manganese, and lead in human hair. Biol Trace Elem Res 40 1-8. 

Indeed, it is the properties of the engineering resin which most likely led to its selection in the first place, so the influence of colorants on them is of utmost importance. Molders and part designers generally understand that mechanical property loss can be expected from the addition of colorants. However, problems arise when they grossly imderestimate their effect. A recent informal survey of part designers revealed that they typically plan for a 5% reduction in mechanical properties due to colorants. Depending on the resin and colorant selection, this number can easily exceed 30% Whafs more, the drive towards thinner and thinner wall sec-... 

Braun, C.C. and P.B. Mine, et al. (1995). The influence of color on warning label perceptions. International Journal of Industrial Ergonomics 15 (3) 179-187. 

Goldstein K. Some experimental observations concerning the influence of colors on the function of the organism. Occup Ther 1942 21 147-51. 

The same researchers discussed the results of a tasting that demonstrated the influence of color on the evaluation of rose wines. Six rose wines were submitted to the evaluation of a tasting group. The wines were classed according to their average score and were ranked according to three different criteria ... 

The temperature decisive for weathering resistance is not the temperature of ambient air, but the temperature of the specimen, Figure 2.7. Due to the absorption of solar radiation it can be considerably above the temperature of the ambient temperature. The degree of absorption of sunlight radiation and the resulting temperature are dependent on specimen color, i.e., one and the same base material in different colorations - independent of any other influence of coloration on material stability - can lead to different, thermally determined values of weathering resistance, see Table 2.10. 

WANG, J., YU, c., HWANG, s., HO, K., CHEN, L., Influence of coloring voltage on the optical performance and cychng stability of a polyaniline-indium hexacyanoferrate electrochromic system. Solar Energy Mater. Solar Cells, 2008,92,112. 

T. Belcher, Holland Colours, Application Lab The Influence of Color... 

Color Additives. Color additives, for the benefit of dog and cat owners, help simulate food richness, which is evaluated ia many differeat ways. The additioa of color helps minimi2e variatioas ia appearance associated with batch difference ia food iagredieats and fineness of gtind. Cats and dogs are practically color blind colors have Utfle influence on them. 

Aminoantipyrine forms with aniUne, for instance, a colored dii under the oxidative influence of iron(III) ions. 

Furfural is produced from glucose under the influence of acid and this reacts with aniline to yield a colored product [5]. 

Under the influence of peroxides aromatic amines (color developer 3) react with phenols to yield quinone imines [1]. 

Table 4 Influences of PVAc Content on Color of Porous Film (Expt. Nos. 1-5) in Chlorobenzene...

Consider, as an example, the logic of a policy decision to build and locate an electric generating plant or oil refinery. Economic considerations such as the availability of ample and inexpensive land, and social considerations such as zoning regulations and political influence, would play a major role m such a decision. In practice, this makes it more likely that plants and refineries, as well as waste sites and other locally undesirable land uses, will be located in poorer communities whose population is often largely people of color. 

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