K. Sakurai et al., Preferential orientation of crystallites spatially confined in lamellar microdomains of polyethylene-block-[atactic poly(propylene)], MACRO RAPID, 21(16), 2000, pp. 1140-1143
Synchrotron small angle X-ray scattering (SAXS), wide angle X-ray scatterin
g (WAXS), and transmission electron microscopy were carried out for an orie
nted polyethylene-block-[atactic poly(propylene)] with a molecular weight o
f 1.13 x 10(5) and a volume fraction of polyethylene of 0.5. Isothermal cry
stallization at 93 degreesC did not destroy the pre-formed microdomain, how
ever, with a higher crystallization temperature, the microdomain was more h
eavily deformed and more crystalline lamella grew. In WAXS profiles, prefer
ential orientation of (020) reflection peak was observed, indicating that t
he crystalline lamella grew in parallel with the micro domain interface.