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Chapter 15: Problem 42

What is the distinction between dye and pigment colorants?

Short Answer

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Answer: The main differences between dye and pigment colorants are their solubility, binding properties, stability, and applications. Dyes are soluble and chemically bond with materials, providing vibrant and uniform colors, whereas pigments are insoluble and provide better stability and resistance to environmental factors. Dyes are commonly used in textiles, plastics, and cosmetics, while pigments are used in printing inks, paints, and coatings.

Step by step solution

01

Understand the definition of dye colorants.

A dye is a soluble colorant that can chemically bond with the fibers or materials it colors, typically through a process called adsorption. Common dye types include acidic, basic, direct, reactive, and vat dyes. Dyes are used in industries such as textiles, plastics, and cosmetics.
02

Understand the definition of pigment colorants.

A pigment is an insoluble colorant that is dispersed and held on the surface of the material it colors, often through a binder. Pigments are inert and do not chemically react with the materials they color. They can be inorganic (such as metal oxides) or organic (such as phthalocyanine pigments). Pigments are commonly used in printing inks, paints, and coatings industries.
03

Compare solubility properties of dyes and pigments.

Dyes are soluble in the medium in which they are applied, while pigments are insoluble. This difference in solubility affects how they interact with the material being colored. Dyes tend to provide more vibrant and uniform colors due to their solubility and ability to bind with the material but may be less resistant to environmental factors. Pigments, on the other hand, are typically more lightfast and chemically stable due to their insolubility.
04

Examine the lightfastness and color stability.

Pigments generally have better lightfastness and color stability than dyes due to their insolubility and inert nature. This means that pigments are less likely to fade or change color under exposure to light or various environmental factors. In contrast, dyes may lose their effectiveness and color intensity over time due to their chemical reactivity.
05

Consider the application methods and use cases.

Dyes are commonly used in textiles, plastics, and cosmetics because they can chemically bond with the material, resulting in uniform and vibrant colors. Pigments, being insoluble, are better suited for applications where long-term stability and resistance to environmental factors are more important, such as in printing inks, paints, and coatings. In summary, the main distinction between dye and pigment colorants lies in their solubility, binding properties, stability, and respective applications. Dyes provide vibrant, uniform colors, but may have lower long-term stability, while pigments offer greater stability and resistance to environmental factors.

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Most popular questions from this chapter

For each of the following pairs of polymers, do ( the following: (1) State whether it is possible to decide whether one polymer has a higher tensile modulus than the other; (2) if this is possible, note which has the higher tensile modulus and cite the reason(s) for your choice; and (3) if it is not possible to decide, state why. (a) Branched and atactic poly(vinyl chloride) with a weight-average molecular weight of \(100,000 \mathrm{~g} / \mathrm{mol}\); linear and isotactic poly(vinyl chloride) having a weight-average molecular weight of \(75,000 \mathrm{~g} / \mathrm{mol}\) (b) Random styrene-butadiene copolymer with \(5 \%\) of possible sites crosslinked; block styrene-butadiene copolymer with \(10 \%\) of possible sites crosslinked (c) Branched polyethylene with a number-average molecular weight of \(100,000 \mathrm{~g} / \mathrm{mol}\); atactic polypropylene with a number-average molecular weight of \(150,000 \mathrm{~g} / \mathrm{mol}\)

Nylon 6,6 may be formed by means of a condensation polymerization reaction in which hexamethylene diamine \(\left[\mathrm{NH}_{2}-\left(\mathrm{CH}_{2}\right)_{6}-\mathrm{NH}_{2}\right]\) and adipic acid react with one another with the formation of water as a by- product. What masses of hexamethylene diamine and adipic acid are necessary to yield \(20 \mathrm{~kg}\) of completely linear nylon \(6,6 ?\) (Note: The chemical equation for this reaction is the answer to Concept Check 15.12.)

For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to $$ \sigma(t)=\sigma(0) \exp \left(-\frac{t}{\tau}\right) $$ where \(\sigma(t)\) and \(\sigma(0)\) represent the time-dependent and initial (i.e., time = 0 ) stresses, respectively, and \(t\) and \(\tau\) denote elapsed time and the relaxation time, respectively; \(\tau\) is a time-independent constant characteristic of the material. A specimen of a viscoelastic polymer whose stress relaxation obeys Equation \(15.10\) was suddenly pulled in tension to a measured strain of \(0.5 ;\) the stress necessary to maintain this constant strain was measured as a function of time. Determine \(E_{r}(10)\) for this material if the initial stress level was \(3.5 \mathrm{MPa}\) (500 psi), which dropped to \(0.5 \mathrm{MPa}\) (70 psi) after \(30 \mathrm{~s}\).

On the basis of the curves in Figure \(15.5\), sketch schematic strain-time plots for the following polystyrene materials at the specified temperatures: (a) Crystalline at \(70^{\circ} \mathrm{C}\) (b) Amorphous at \(180^{\circ} \mathrm{C}\) (c) Crosslinked at \(180^{\circ} \mathrm{C}\) (d) Amorphous at \(100^{\circ} \mathrm{C}\).

Cite four factors that determine what fabrication technique is used to form polymeric materials.
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