Asiatic acid, madecassic acid, asiaticoside, madecassoside, volatile oil of a terpene acetate, camphor, cineole, glycerides, plant sterols, polyacetylene compounds, flavonoids, myo-inositol, sugars, vellarin, and more . . .

Most plastic paper clips are made only of plastic and are not magnetic. If you have one that contains a magnetic metal like steel, then you might be able to make it magnetic, depending on the thickness of the coating and how you went about the process.

The most common form of biological melanin is eumelanin, a brown-black polymer of dihydroxyindole carboxylic acids, and their reduced forms. All melanins are derivatives of polyacetylene. Most are derived from the amino acid tyrosine. Another common form of melanin is pheomelanin, a cysteine-containing red-brown polymer of benzothiazine units largely responsible for red hair and freckles.

polymers are classified into 5 types as follows:

A))based on synthesis:

1)addition polymers

2)condensation polymers

B))based on inter molecular forces:

1)fibers

2)elastromers

3)thermoplastics

4)thermosettings

C))from source

1)natural polymers

2)synthetic polymers

D))based on material

1)organic polymer

2)inorganic polymer

E))based on structure

1)linear polymer

2)branched polymer

3)cross linked polymer

F))based on the monomer

1)homo polymer

2)hetero polymer

In general, plastics are composed of many chains of complex molecules. In a lot of cases, all the valence electrons of all the atoms of the material are in Fermi energy levels below the conduction band. That is, the energy required to move electrons in plastics is "high" because the energy levels that electrons would have to be in within the structure of the plastic are well above where the electrons are actually hanging out.

The conduction band is a term we apply to the energy band that electrons have to be in to support current flow. Remember that current flow is like musical chairs in that everyone has to "move over one" all along the current path for current to flow. It's isn't about one electron going "into" a circuit at one end and that same electron coming out the other end. The "willingness" of electrons to "move over" to support current flow is conductivity, and electrons that are in "too low" an energy level (because they are being "kept at home" by the chemical structure of the material - the plastic) won't help with conduction. Just as a quick contrast, in a metal, there are lots of electrons in energy levels high enough to support conduction. These are the so-called "free electrons" you hear about. Plastics don't have them.