By defining a total correction factor Fa for the WAXS curves of amorphous homopolymers, a new method for the resolution between overlapping WAXS curves is proposed and used to evaluate the apparent crystallinity relative to the entire sample and the substantial crystallinity relative to the poly(ethylene oxide) grafts alone in polystyrene-graft-poly(ethylene oxide) binary copolymers. By introducing the concept of amorphous matrix, the same method is also used to evaluate the two kinds of crystallinities in poly(n-butyl acrylate-acrylic acid)-graft-poly(ethylene oxide) ternary copolymers. Both apparent crystallinity and substantial crystallinity increase with increasing poly(ethylene oxide) content, but the substantial crystallinity can characterize the effects of the backbone chains on the crystallization of the poly(ethylene oxide) grafts more distinctly and more reasonably than the apparent crystallinity
Посилання на статтю:
General procedure for evaluating apparent crystallinity and substantial crystallinity from WAXS patterns of binary and ternary copolymers / Ning Yao // Polymer. – 1992. – Vol 33. – P. 1802-1808.