Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 133, Issue 47, Pages -Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.44257
Keywords
extrusion rate; fibrillation process; flow rate; nanofibrillar morphology; shear flow
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Funding
- German Research Foundation [BR 1886-/6-1]
- Vietnamese Ministry of Education and Training
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The effects of the extrusion rate on the morphological changes of poly(lactic acid) (PLA)/poly(vinyl alcohol) (PVA) blend through a capillary die were investigated. In this study, the extrusion rate or mass flow rate is altered from 0.5 gmin(-1) to 2 gmin(-1) with an increment of 0.5 gmin(-1). The PLA/PVA blend with a composition of 30/70 (wt %) exhibits a particle matrix morphology with dispersed PLA droplets within the PVA matrix. It is found that, the spherical or ellipsoidal dispersed PLA droplets are elongated and coalesced into rod-like or longer ellipsoidal droplets when they pass through the capillary die. When the extrusion rate increases, the coalescence between the large PLA droplets occurs more intense. However, the changes of the extrusion rate have no strong effect on the coalescence of small droplets having diameter less than about 150 nm. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44257.
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