J. Duvall et al., EFFECT OF COMPATIBILIZATION ON THE PROPERTIES OF POLYPROPYLENE POLYAMIDE-66 (75 25WT/WT) BLENDS/, Journal of applied polymer science, 52(2), 1994, pp. 195-206
Interfacially compatibilized immiscible blends with an isotactic polyp
ropylene matrix (PP) and dispersed polyamide-66 (PA) were prepared by
extrusion with anhydride-grafted isotactic PP compatibilizers, one of
high-anhydride content (HAC, 2.7 wt % grafted maleic anhydride) and on
e of low-anhydride content (LAC, 0.2 wt % anhydride). On a weight basi
s, HAC was more efficient than LAC in dispersing PA to submicron domai
ns, but on a total weight % anhydride basis, both compatibilizers were
equally efficient. Both compatibilizers imparted similar tensile stre
ngth improvement compared to an uncompatibilized blend. Maximum fractu
re strain was obtained at similar total anhydride content, but much hi
gher maximum fracture strain was achieved with LAC than with HAC. Good
adhesion in an 11.25 wt % LAC blend was seen at the microscale as fib
rillar ligaments connecting PA particles to the drawn PP matrix. Inter
facial failure was observed in a lower fracture strain composition, 11
.25 wt % HAC. (C) 1994 John Wiley & Sons, Inc.