In:
Polymer Engineering & Science, Wiley, Vol. 40, No. 6 ( 2000-06), p. 1447-1457
Kurzfassung:
A novel, continuous process, solid‐state shear pulverization (S 3 P), efficiently mixes blends with different component viscosities. Melt mixing immiscible polymers or like polymers of different molecular weight often requires long processing times. With a batch, intensive melt mixer, a polyethylene (PE)/polystyrene (PS) blend with a viscosity ratio (low to high) of 0.019 required up to 35 min to undergo phase inversion. Phase inversion is associated with a morphological change in which the majority component, the high‐viscosity material in these blends, transforms from the dispersed to the matrix phase, and may be quantified by a change from low to high mixing torque. In contrast, such blends subjected to short‐residence‐time (∼3 min) S 3 P yielded a morphology with a PS matrix and a PE dispersed phase with phase diameters ≤ 1 μm. Thus, S 3 P directly produces matrix and dispersed phases like those obtained after phase inversion during a melt‐mixing process. This assertion is supported by the similarity in the near‐plateaus in torque obtained in the melt mixer at short times with the pulverized blend and at long times with the non‐pulverized blend. The utility of S 3 P to overcome problems associated with melt mixing like polymers of extreme viscosity ratio is also shown.
Materialart:
Online-Ressource
ISSN:
0032-3888
,
1548-2634
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2000
ZDB Id:
2006718-5
ZDB Id:
241423-5
