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Chapter 15: Problem 42

What is the distinction between dye and pigment colorants?

Short Answer

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What is the main difference between dye and pigment colorants, and provide examples of each. The main difference between dye and pigment colorants is that dyes are soluble colorants that can dissolve in a specific solvent such as water or another liquid, while pigments are insoluble particles that do not dissolve in solvents and are suspended in a medium to create a colored mixture. Examples of dyes include: 1. Acid dyes, such as Alizarin used to color wool, silk, and synthetic fibers. 2. Direct dyes, such as Congo Red used to color cotton and other cellulose-based materials. 3. Food dyes, such as Red No. 40 and Blue No. 1 used to color candies and beverages. Examples of pigments include: 1. Inorganic pigments, such as Iron oxide pigments used to produce a wide range of colors including reds, yellows, and browns. 2. Organic pigments, such as Quinacridone pigments used to provide a range of vibrant red and magenta hues. 3. Titanium dioxide, a common white pigment used in paint, plastics, and cosmetics.

Step by step solution

01

Definition of Dye and Pigment Colorants

A dye is a soluble colorant, which means it can dissolve in a specific solvent, like water or another liquid. Dyes are used to color a wide variety of materials, such as textiles, food, and cosmetics. Pigments, on the other hand, are insoluble particles that do not dissolve in solvents; instead, they are suspended in a medium to create a colored mixture. Pigments are often used for applications such as paints, coatings, and inks.
02

Properties of Dyes

Dyes exhibit several characteristic properties that make them unique as colorants: 1. Solubility: Dyes can dissolve in solvents, which allows them to penetrate and bond with the material being colored, such as a fabric or a liquid. 2. Molecular structure: Dyes typically have complex and large molecular structures, which allow them to absorb and reflect specific wavelengths of light to create color. 3. Color fastness: Dyes can create very vibrant colors, but they may not be as durable or resistant to fading as pigments.
03

Properties of Pigments

Pigments have properties that differentiate them from dyes and make them suitable for certain applications: 1. Insolubility: Pigments do not dissolve in a solvent; instead, they are suspended evenly throughout the mixture to create a uniform color. 2. Particle size: Pigments can come in various particle sizes, which influences their opacity, color strength, and dispersion. 3. Durability: Since pigments are insoluble particles, they generally have greater resistance to fading and sunlight exposure than dyes.
04

Examples of Dyes

Some common examples of dyes include: 1. Acid dyes: Used to color wool, silk, and synthetic fibers. An example is Alizarin, a red dye derived from the madder plant. 2. Direct dyes: Used to color cotton and other cellulose-based materials. An example is Congo Red, a synthetic dye used in textile coloring. 3. Food dyes: Used to color foods, such as Red No. 40 and Blue No. 1, which are common colorants in candies and beverages.
05

Examples of Pigments

Some common examples of pigments include: 1. Inorganic pigments: Derived from mineral sources, such as Iron oxide pigments, which can produce a wide range of colors including reds, yellows, and browns. 2. Organic pigments: Synthetic compounds created in a lab, such as Quinacridone pigments, which provide a range of vibrant red and magenta hues. 3. Titanium dioxide: A common white pigment used in paint, plastics, and cosmetics. In summary, the distinction between dye and pigment colorants lies in their solubility, molecular structure, and application in various industries. Dyes are soluble and used primarily for textiles, food, and cosmetics, while pigments are insoluble particles used for paints, coatings, and inks.

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Most popular questions from this chapter

Cite the primary differences between addition and condensation polymerization techniques.

For each of the following pairs of polymers, (1) state whether it is possible to determine whether one polymer has a higher melting temperature than the other; (2) if it is possible, note which has the higher melting temperature nd then cite reason(s) for your choice; and 3) if it is not possible to decide, then state why. (a) Isotactic polystyrene that has a density of \(1.12 \mathrm{~g} / \mathrm{cm}^{3}\) and a weight-average molecular weight of \(150,000 \mathrm{~g} / \mathrm{mol}\); syndiotactic polystyrene that has a density of \(1.10 \mathrm{~g} / \mathrm{cm}^{3}\) and a weight-average molecular weight of \(125,000 \mathrm{~g} / \mathrm{mol}\) (b) Linear polyethylene that has a degree of polymerization of 5000 ; linear and isotactic polypropylene that has a degree of polymerization of 6500 (c) Branched and isotactic polystyrene that has a degree of polymerization of 4000 ; linear and isotactic polypropylene that has a degree of polymerization of 7500

The tensile strength and number-average molecular weight for two polyethylene materials are as follows: \begin{tabular}{cc} \hline Tensile Strength (MPa) & Number-Average Molecular Weight \((\mathrm{g} / \mathbf{m o l})\) \\ \hline 85 & 12,700 \\ 150 & 28,500 \\ \hline \end{tabular} Estimate the number-average molecular weight that is required to give a tensile strength of \(195 \mathrm{MPa}\).

For each of the following pairs of polymers, plot and label schematic stress- strain curves on the same graph [i.e., make separate plots for parts (a), (b), and (c)] (a) Isotactic and linear polypropylene havng a weight-average molecular weight of \(120,000 \mathrm{~g} / \mathrm{mol}\); atactic and linear polypropyene having a weight-average molecular weight of \(100,000 \mathrm{~g} / \mathrm{mol}\) (b) Branched poly(vinyl chloride) having a degree of polymerization of 2000 ; heavily crosslinked poly(vinyl chloride) having a degree of polymerization of 2000 (c) Poly(styrene-butadiene) random copolymer having a number-average molecular weight of \(100,000 \mathrm{~g} / \mathrm{mol}\) and \(10 \%\) of the available sites crosslinked and tested at \(20^{\circ} \mathrm{C}\); poly(styrene- butadiene) random copolymer having a number-average molecular weight of \(120,000 \mathrm{~g} / \mathrm{mol}\) and \(15 \%\) of the available sites crosslinked and tested at \(-85^{\circ} \mathrm{C}\). Hint: poly(styrene- butadiene) copolymers may exhibit elastomeric behavior.

In Figure 15.28, the logarithm of \(E_{r}(t)\) versus the logarithm of time is plotted for polyisobutylene at a variety of temperatures. Make a plot of \(E_{r}(10)\) versus temperature and then estimate its \(T_{g}\).
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