Modeling their structure as a random walk results in a Gaussian distribution based on end-to-end distance.  
The flexibility of these molecules can be described by the Kuhn length.  Modeling their structure as a random walk results in a Gaussian distribution based on end-to-end distance.  Those in solid state exhibit amorphous and semicrystalline morphology and those that are linear or branched can exhibit thermoplasticity.  Natural examples include cellulose and chitin, and synthetic examples include Lexan, Kevlar, and Plexiglass.  FTP, identify these long chainlike molecules consisting of many repeating subunits.
The flexibility of these molecules can be described by the Kuhn length.  
polymers