Abstract
The importance of crystal growth rate in the morphological formation of strongly interacting crystalline/amorphous polymer blends has been assessed by considering polycaprolactone (PCL)/poly(4-vinylphenol) (PVPh) systems. The effects of composition and molecular weight (MW) on the morphological structure were investigated by small-angle X-ray scattering (SAXS). Blending with PVPh increased the long period associated with the alternating crystalline−amorphous layers. The long period increase was characterized by the thickening of PCL crystals upon blending instead of the swelling of amorphous layers. The extent of extralamellar segregation of PVPh was revealed from the volume fraction of lamellar stacks. Despite the relatively high Tg of PVPh, significant extralamellar segregation of PVPh was observed. The extent of extralamellar segregation increased with PVPh composition for a given molecular weight combination of PCL and PVPh. For a given composition, the blends with PCL molecular weight (MPCL) of 15 80...
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