2.7 Resins and Resin Combinations
Resins,
in general, are amorphous solid or
semisolid substances that are invariably water insoluble but mostly soluble in
alcohol or other organic solvents. However, physically they are found to be hard,
translucent or transparent and fusible i.e., upon heating they first get
softened and ultimately melt. But chemically, they are complex mixtures of
allied substances, such as: resin acids, resin alcohols (or resinols),
resinotannols, resin esters, glucoresins and the like.
Another
school of thought considers Resins as amorphous products having an
inherent complex chemical entity. These are normally produced either in
schizogenous or in sehizolysigenous ducts or in carities and are regarded as
the end products of metabolism. The physical general characteristic features of
resins are namely: hard, transparent, or translucent and, when heated they
yield usually complex mixtures that comprise of resin acids, resin alcoholds,
resinotannols, esters and resenes. Some researehers do believe that the resins
are nothing but the oxidation products of the terpenes. They are found
to be mostly insoluble in water, but soluble in ethanol and organic solvents.
They are electrically non-conductive and combustible in nature.
Resins
shall now be discussed at length in their
various aspects as enumerated here under:
1 Comment:
what is a resin combination?
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