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Chapter 15: Problem 36

Briefly explain the difference in molecular chemistry between silicone polymers and other polymeric materials.

Short Answer

Expert verified
Answer: The main difference in molecular chemistry between silicone polymers and other polymeric materials lies in their molecular structure, specifically the backbone. Silicone polymers have a silicon-oxygen backbone with organic side groups, while other polymers, such as organic polymers, have a carbon-based backbone. This contributes to silicone polymers' unique properties, including greater thermal stability, resistance to degradation, and versatility in applications.

Step by step solution

01

Understand the composition of silicone polymers

In order to understand how silicone polymers are different from other polymeric materials, we first need to understand the composition of silicone polymers. These consist of alternating silicon and oxygen atoms in the backbone, with organic side groups attached to the silicon atoms.
02

Understand the composition of other polymeric materials

Other polymeric materials, which can be broadly classified into two groups, namely organic polymers and inorganic polymers, typically have a backbone of carbon atoms (for organic polymers) or a combination of different elements, such as boron, nitrogen, and phosphorus (for inorganic polymers). The side groups vary significantly depending on the type of polymer.
03

Compare the silicon-oxygen backbone of silicone polymers to carbon-based backbones

The key difference between silicone polymers and organic polymers lies in the nature of the backbone. While silicone polymers have a silicon-oxygen backbone, organic polymers have a carbon-based backbone. The silicon-oxygen bond is more stable and less reactive than the carbon-carbon bond found in organic polymers. This results in silicone polymers being more resistant to degradation at high temperatures and in harsh chemical environments.
04

Discuss the effect of organic side groups on silicone polymers

The organic side groups attached to the silicon atoms in silicone polymers also contribute to their unique properties. These side groups affect the flexibility, thermal stability, and chemical resistance of the polymer. In general, silicone polymers exhibit low surface energy, low toxicity, and outstanding resistance to moisture and ultraviolet radiation when compared to other polymeric materials.
05

Mention the applications of silicone polymers

Due to their unique molecular chemistry, silicone polymers find use in a wide range of applications, such as sealants, adhesives, electrical insulation, medical devices, coatings, and many others. This versatility and durability make silicone polymers a valuable material in various industries. In conclusion, the primary difference between silicone polymers and other polymeric materials lies in their molecular chemistry, which includes a silicon-oxygen backbone and organic side groups. These unique features grant silicone polymers a range of valuable properties such as high thermal stability, resistance to degradation, and versatility in applications.

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Most popular questions from this chapter

In your own words, briefly describe the phenomenon of viscoelasticity.

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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 \(150,000 \mathrm{~g} / \mathrm{mol}\)
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