What are properties of polymers?

What are properties of polymers?

What are properties of polymers?

Some of the useful properties of various engineering polymers are high strength or modulus to weight ratios (light weight but comparatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost.

How are polycarbonates made?

The polycarbonate most used is manufactured by condensation polymerization between bisphenol A and either carbonyl chloride or diphenyl carbonate. Bisphenol A is produced by the condensation of phenol with propanone. The polymer is usually formed by the reaction of bisphenol A and carbonyl chloride in a basic solution.

Is polycarbonate engineering thermoplastic?

Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed.

What are 3 properties of polymers?

A1.1 PHYSICAL PROPERTIES Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Some of these are discussed herewith in the following sections.

Why are polycarbonates so strong?

What Makes Polycarbonate So Strong? The source of polycarbonate’s strength is its incredibly strong chemical structure. Its molecules possess tremendously strong bonds in high numbers, giving it its unique levels of resistance.

How long does it take for polycarbonate to yellow?

It depends on climate and whether the Lexan was treated or coated for UV exposure. There are greenhouses that go far more than 10 years and they aren’t yellow. For untreated Lexan the yellow is on the surface and can be polished off.

Which type of polymer is?

polymer, any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers. Polymers make up many of the materials in living organisms, including, for example, proteins, cellulose, and nucleic acids.

What are some of the problems with polymers?

The biggest problem as mentioned above is that polymers are non-biodegradable which means that microorganisms cannot naturally break them down. Disposal of polymers by burning or incineration is a possibility, as this generates heat which can be used to generate electricity.

Which is the best example of a polymer?

Here are some specific examples of polymers and their common uses. Polythene used for carrier bags and plastics. High-density polyethylene is used for drain pipes, water bottles, and containers. Polystyrene is used in packaging. Polypropylene is used for bottle caps, plastic bottles, and plastic pipes.

Are there any natural polymers in the body?

There are a number of natural polymers in life such as rubber, and even in our own body we have natural polymers such as proteins, carbohydrates, and DNA to name just a few. We’ll focus the rest of this tutorial on synthetic polymers.

What are the four basic structures of polymers?

There are four basic polymer structures which are shown in the figure below. In practice, some polymers might contain a mixture of the various basic structures. The four basic polymer structures are linear, branched, crosslinked, and networked. Diagrams of linear, branched, crosslinked, and networked polymer structures.