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Chapter 15: Problem 38

Cite five important characteristics for polymers that are to be used in thin- film applications.

Short Answer

Expert verified
Answer: The five important characteristics for polymers that are suitable for thin-film applications are thermal stability, mechanical properties, chemical resistance, optical properties, and processability.

Step by step solution

01

Define Thin-film Applications

Thin-film applications refer to the use of very thin layers (usually on the order of nanometers to micrometers) of a material, in this case, polymers, for various purposes. These applications can be found in industries such as electronics, solar cells, surface treatment, and optics.
02

Identify the First Characteristic - Thermal Stability

Polymers used in thin-film applications should have good thermal stability. This means that they should be able to withstand high temperature processing and use conditions without degrading or losing their desirable properties.
03

Identify the Second Characteristic - Mechanical Properties

The mechanical properties of the polymer, such as flexibility, strength, and durability, are crucial for thin-film applications. These properties ensure that the polymer can withstand the mechanical stress and strains that it may experience during fabrication, processing, and use.
04

Identify the Third Characteristic - Chemical Resistance

Polymers used in thin-film applications should show good chemical resistance to various chemicals and environmental factors, such as solvents, acids, and alkalis. This is critical to preserve the longevity and performance of the thin-film polymer in harsh conditions.
05

Identify the Fourth Characteristic - Optical Properties

In some thin-film applications, specific optical properties like transparency, refractive index, and color could be essential. Therefore, the polymers should possess desirable optical properties to meet the requirements of such applications.
06

Identify the Fifth Characteristic - Processability

Polymers suitable for thin-film applications should have good processability, allowing them to be easily deposited, patterned, and fabricated using various thin-film manufacturing techniques such as spin coating, spray coating, and plasma deposition. In summary, the five important characteristics for polymers that are to be used in thin-film applications are thermal stability, mechanical properties, chemical resistance, optical properties, and processability.

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Most popular questions from this chapter

The vulcanization of polyisoprene is accomplished with sulfur atoms according to Equation 15.4. If \(57 \mathrm{wt} \%\) sulfur is combined with polyisoprene, how many crosslinks will be associated with each isoprene repeat unit if it is assumed that, on the average, six sulfur atoms participate in each crosslink?

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 \(T_{g}\).

Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? Justify each choice. (a) Epoxy having a network structure (b) Lightly crosslinked poly(styrenebutadiene) random copolymer that has a glass transition temperature of \(-50^{\circ} \mathrm{C}\) (c) Lightly branched and semicrystalline polytetrafluoroethylene that has a glass transition temperature of \(-100^{\circ} \mathrm{C}\) (d) Heavily crosslinked poly(ethylenepropylene) random copolymer that has a glass transition temperature of \(0^{\circ} \mathrm{C}\) (e) Thermoplastic elastomer that has a glass transition temperature of \(75^{\circ} \mathrm{C}\)

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

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 \(100^{\circ} \mathrm{C}\).
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