G. Barra et al., Transport properties of dichloromethane in polymeric blends - Part I - Lowdensity polyethylene-isotactic polypropylene, J MATER SCI, 34(18), 1999, pp. 4601-4606
Low density polyethylene (LDPE) and either isotactic polypropilene (IPP) or
a copolymer of isotactic polypropilene with 3% of ethylene (CPP) were blen
ded, and analyzed with X-rays, differential thermal calorimetry, dynamic me
chanical analysis, and transport properties of dichloromethane vapour at di
fferent activities. The results show that polyethylene and polypropylene cr
ystallize in different domains in the usual crystalline forms (orthorhombic
and monoclinic respectively). Also the amorphous phases are not miscible;
moreover in the blend LDPE-IPP, in which PE crystallize less, the transport
of the vapours occurs mainly through polyethylene, whereas the opposite is
true in the blend LDPE-CPP, in which polypropylene crystallizes less. The
sorption properties are in agreement with the additivity of sorption of the
two amorphous phases. (C) 1999 Kluwer Academic Publishers.