New segment, formed by a group of two arrays between two main chains, makes up their figure and physical properties. Segment gives two types by temperature, which belongs thermal (under Tg) andmechanical domain (Tm- Tg). Tg happens to reach elongation limit of ï¡ïTg = 1%. where Tmismelting point, Tg is transition temperature and ï¡ is thermal expansion rate. Two domains have the same 1%elongation limit.Although symmetrical structure holding Tg =ï ï¥Tgi shows the same ï¡ï =ï ï¥ï¡i in both domains, asymmetry changes 2ï¡ï = 2ï¥ï¡i inmechanical domain.Where ï¡i is componentmolecule. The common ï¡ in symmetrical domains supports existence of crystallization. The mechanical moving of horizontal direction happens displacement of C-Cbond less than 8ï°at 1%limit, which all elongation of composite molecules forms a line. Segment having a sturdy structure due to fine stroke by thermal elongation is in charge ofYoungÂs modulus in the equation of strength and elongation happens in single main chain. ï¡ can use to replace entropy with traditional ways of thinking for polymer.