A polymer's conformation changes drastically based on its environment: Nature Index Polymer Physics and Rheological Behavior
: Unlike small molecules, polymers rarely form perfect crystals. They are typically semi-crystalline , containing both ordered (crystalline) and disordered (amorphous) regions. Polymer Physics
) : The temperature where a polymer transitions from a hard, brittle "glassy" state to a soft, flexible "rubbery" state. A polymer's conformation changes drastically based on its
The behavior of a single polymer chain is a foundation for more complex systems like melts or solutions. The behavior of a single polymer chain is
: Above a certain molecular weight, chains become physically interlaced, creating a temporary network that resists motion.
: The simplest model (like a Random Walk ) assumes monomers have no volume and do not interact except through their immediate neighbors.
) : A more universal measure of the chain's size relative to its center of mass, used for all architectures (branched, star, etc.). 2. Physical States and Phase Transitions