I had to read your definition about 4 times and still didn't understand it.
This is from my Dictionary.
"the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy."
Emphasis added by me.
The
Chemical part is where
plastics "decompose" and increase
Entropy!
______
I think
Entropy as been associated with "Disorder".
Example:
Man takes sand and adds energy and mechanically forms a fragile drinking glass.
That glass is used to drink liquids and appears to be in a state of now
Zero Entropy and stable.
Dishwasher safe!!
Then... whoops!
It falls to a concrete surface and breaks apart.
The glass was in a state of "order" and now becomes more "disordered".
But Entropy was increased, but in a
minimum way.
So...
Plastics are stable
Entropy, but seek to decompose and Make more
Entropy!
Jim...
PS: The fragile glass did not fall and break back into sand particles from which it came. Thus broken glass is more of a problem than plastics.