Equations describing lamellar structure parameters and melting points of polyethylene- Tco-(butene\octene)s

Time- and temperature-dependent SAXS-experiments were used to determine the effect of octene and butene co-units on the lamellar structure and the melting properties of polyethylene. As expected, melting points decrease with increasing co-unit content, but crystal thicknesses are not affected and depend on the crystallization temperature only. Results can be cast into some simple equations which describe the dependence:1. Of the melting point Tf on the crystal thickness dc and the co-unit content xB 2. Of the equilibrium melting point on xB 3. Of dc on the crystallization temperature Tc 4. Of the long spacing L on Tc, xB and the molar mass 5. Of Tf on Tc.