Polymer Class

Severalcommon objects that are made of polymeric materials: plastic tableware (spoon, fork, and knife), billiard balls, a bicycle helmet, two dice, a lawnmower wheel (plastic hub and rubber tire), and a plastic milk carton. (Photography by S. Tanner.)

Now, we are talking about the third class of material, polymer. Before we discuss about this class, we have to know what polymer is.

Definition :

The word polymer literally means "many parts." So that’s why it call poly-because it consist of many part of monomer.
Another definition is:

Any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule.[1]-

A molecule that consists of repeated, linked units, with each unit being called a monomer.

[2]-

A material that contains many chemically bonded parts or units which themselves are bonded together to form a solid. [3]-

Properties:

Polymers have properties that distinguish with other materials.

Polymer are:

• less dense than metals or ceramics,
• resist atmospheric and other forms of corrosion,
• offer good compatibility with human tissue,
• exhibit excellent resistance to the conduction of electrical current,
• extremely ductile and pliable (i.e., plastic), which means they are easily formed
  into complex shapes,
• have low electrical conductivities

Structure:
A single polymer molecule may consist of hundreds to a million monomers and may have a linear, branched, or network structure.

Atomic Bond:
Covalent bonds hold the atoms in the polymer molecules together and secondary bonds then hold groups of polymer chains together to form the polymeric material. Copolymers are polymers composed of two or more different types of monomers.

Fotenote:
1. http://www.answers.com/topic/polymer
2.http://wiki.answers.com/Q/What_is_a_polymer&src=ansTT
3.http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Introduction/polymers.htm

Reference:
1.http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Structure/polymer.htm

The Scope of Metallurgy and Materials Engineering

On the previous post we discussed what it was metallurgy and materials engineering. Now we will discuss the scope of metallurgy and materials engineering.

The scope of Metallurgy and Materials Engineering:

As shown in the diagram, on the Microstructure, one must understand the different metallurgical properties owned material, starting from atoms, molecules, electrons, crystals.

In the processing, metallurgy must understand how to process the ore or raw material into something that the desired material.

In the fabrication, metallurgist is expected to process more material that there became something components, tools and various other applications, in this section, the expertise of the materials are in need, because if the wrong material or wrong to make will lead to accidents or damage while in wear, even when the fabrication.

The last one, in part to protect the agent of destruction, it is normal if the material has aged wear, especially if the use was in conditions that are less supportive, one of which is corrosion, it will further shorten the life of a material age. Here matelurgi role to engineer the material to increase expiry date and not easily degraded.

Remember, this is only prolong the life of wear, can not be forever preserved. Expertise required for that material merecycle expiry date is over or has been degraded.

That's all I can write here, please amended if there is an error: just give your comment below or email me : Dr.Logam @ gmail.com

What Is Metallurgy and Materials Engineering?

Metallurgy and Materials Engineering is the discipline which studies the production, processing, characterization, selection, and design materials. Metallurgist's obligations is to design new materials, develop and modify the manufacturing process of materials, material selection, failure analysis due to the use of materials, and characterization of the structure and properties of materials.

Outlines the scope of metallurgy and materials engineering can be described in the chart below

For more details about the diagram above, Insha Allah, will be written in the next posting