![]() ![]() The bullet just pushes the molecules ahead of it forward without disturbing the ones on either side.Ī macromolecule is different from regular molecules because a force on one part of the molecule will be transmitted very far away. We can imagine a macromolecule spanning many layers, so that when the bullet hits one end of the molecule, the other end of the molecule transmits this force to its neighbors. Viscosity is not a phenomenon limited to macromolecules. In fact, liquids don't really exhibit the no-viscosity case outlined above, because the molecules do interact with each other. However, different liquids do exhibit different viscosities, and macromolecules are on the high-viscosity end of the spectrum. In reality, macromolecules are not like long sticks tumbling over each other. They are floppy and can change shape because of bond rotations they can undergo "conformational change". ![]() As a result, macromolecules become "entangled" with each other.Įntanglement is a very important feature in polymer behavior. It influences the viscosity of a polyer in its melted state, which affects how easily the polymer can be molded into different shapes for different applications. Not only that, but it strongly influences the physical strength of a plastic in its regular, room-temperature state.
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