“…Certainly, the above results demonstrate that, besides the nucleation of iPP nanofibrils, the stress applied by extensional flow actually increases the nucleation density, finally leading to the twist of LDPE lamellae with different extent. Moreover, it is worth noting that, under these conditions of nearly “melt” growth, the chains are tilted in the lamellae, in which the fold surface in such a case is (201), meaning that the chains are tilted at an angle of ≈ 35° . Here this angle is also to the iPP nanofibrils axis, while the lamellar surfaces are always normal to the iPP nanofibrils axis, however, the calculated angle is not consistent with our measured one (≈45°), the discrepancy may be attributed to incomplete twist, the diffraction signal from full depth of sample, or randomly oriented crystallites …”