Please use this identifier to cite or link to this item:

TitleTrans-crystallisation with reorientation of polypropylene in drawn PET/PP and PA66/PP blends : part. 1 study with WAXS of synchrotron radiation
Author(s)Apostolov, Anton Atanassov
Samokovlijski, O.
Fakirov, Stoyko
Stribeck, N.
Denchev, Z.
Evstatiev, M.
Friedrich, K.
Funari, S. S.
Synchrotron radiation
Issue date2005
PublisherSpringer Verlag
JournalProgress in Colloid and Polymer Science
Abstract(s)Transcrystallisation induced by annealing in the polypropylene (PP) component of nanostructured polymer-polymer composites (NPC) was studied for two different polymeric fillers. In contrast to the typical narrow columnar transcrystalline regions around filler fibres in common glassfibre reinforced PP, volume-filling transcrystallisation was observed for both of the polymer fillers, thus resulting in reorientation of the PP matrix crystals instead of an expected isotropisation. Two colddrawn blends of PP with poly(ethylene terephthalate) (PET) or polyamide 66 (PA66), respectively, namely PET/PP and PA66/PP both in a ratio of 50/50 wt.% were investigated by means of wide-angle X-ray scattering (WAXS) of synchrotron radiation during heating, melting of only the low-melting component (PP) at 200 C yielding an isotropic melt, and subsequent crystallisation upon cooling. A strong epitaxial effect of the persistent embedded microfibrillar component (PET or PA66) on the non-isothermal crystallisation behaviour of PP during its cooling to room temperature was found. The composites obtained after such thermal treatment represented anisotropic semi-crystalline nanocomposites, in which the PP crystallites were reoriented. The ultimate structure for the PET/PP blend exhibited crystals with their molecular axis tilted at approx. 49 with respect to their initial orientation (parallel to the fibre axis). In the PA66/PP blends the ultimate structure returned to the initial orientation of the PP chains parallel to the fibre axis, but with a broadened orientation distribution. Results of similar studies on other blends are reviewed.
TypeBook part
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

Files in This Item:
File Description SizeFormat 
2.Transcrystallisation with reorientation pf polypropylene in drawn PET_PP and PA66_PP blends.pdf
  Restricted access
4,77 MBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID