Dear Nasrin,

they are available in most polymer physics books. In the forthcoming days I'll try to provide you with at least one book (if it is not volumunous to be attached. Regards

Hi. Thanks very much .

No thanks. Would you please check the following link. Sooner I'll provide you with more documents. Regards

https://www.researchgate.net/publication/229874280_Crystallization_of_short_aliphatic_polymer_chains_I_General_chain-folding_behavior/amp

Hi

Dear Abdelkader BOUAZIZ,

Thanks very much for your help.

Regards

Dear Nasrin,

I have other volumunous books that I could not attach. Best Regards

Hi ,

I followed the link of article you prepared in your answer and it was really helpful and I downloaded some other related articles in this field.

Thanks so much for attention.

Nice and good luck. Regards

just check wikipedia on entropic force article about polymer folding, and ideal chain

https://en.wikipedia.org/wiki/Entropic_force

https://en.wikipedia.org/wiki/Ideal_chain