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- Publisher
- Taylor & Francis
- Copyright
- Copyright Taylor & Francis Group, LLC
- ISSN
- 1525-609X
- eISSN
- 1558-3724
- DOI
- 10.1080/00222340601044375
- Publisher site
- See Article on Publisher Site
Abstract
The main goal of this study is to obtain a morphological confirmation of the contribution of coalescence to the fibril formation mechanism in microfibril reinforced composites (MFC) and in this way to explain the large differences in sizes of the starting spheres and the resulting long microfibrils, at rather modest draw ratios (between 6 and 12). For this purpose, the peculiar property of compatibilizers has been exploited, namely coating the dispersed particles and thus preventing them from eventual coalescing after coming in contact. Using scanning electron microscopy (SEM) on samples at various stages of the cold drawing of polypropylene/poly(ethylene terephthalate) blends with and without a compatibilizer, the assumed mechanism has been established: the MFC from compatibilized blends show much shorter microfibrils because the compatibilizer inhibits the coalescence process. A qualitative model illustrating the transformation of the dispersed spheres into microfibrils due to coalescence during the cold drawing is also discussed. In Commemoration of the Contributions of Professor Valery P. Privalko to Polymer Science.
Journal
Polymer Reviews – Taylor & Francis
Published: Feb 1, 2007
Keywords: microfibril reinforced composites; coalescence; fibril formation mechanism; polymer blends