Chain Length Dependence on Folding Transition of a Semiflexible   Homo-polymer Chain: Appearance of a Core-Shell Structure
  The folding transition of single, long semiflexible polymers was studied with special emphasis on the chain length effect using Monte Carlo simulations. While a relatively short chain (10-25 Kuhn segments) undergoes a large discrete transiton between swollen coil and compact toroid conformations, a long chain (50 Kuhn segments) exhibits an intrachain segregated state between the disordered coil and ordered toroid. 
Yuji Higuchi, Takahiro Sakaue, Kenichi Yoshikawa