Melting behavior and crystalline order of ß‐crystalline phase poly(propylene)

Differential scanning calorimetry and X‐ray diffraction experiments on ß‐nucleated poly(propylene) were made on samples crystallized at different temperatures. The crystal perfection was shown to vary with crystallization temperature. The observed multiple peaks could be related to a ß1‐phase with defective inclination of the chains, a recrystallized or original ß2‐phase of more perfect inclination, and the α‐phase.