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Co-crystallization in ternary polyethylene blends: tie crystal formation and mechanical properties improvement

Eslamian, M ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1002/pi.5191
  3. Publisher: John Wiley and Sons Ltd , 2016
  4. Abstract:
  5. Understanding the co-crystallization behavior of ternary polyethylene (PE) blends is a challenging task. Herein, in addition to co-crystallization behavior, the rheological and mechanical properties of melt compounded high density polyethylene (HDPE)/low density polyethylene (LDPE)/Zeigler − Natta linear low density polyethylene (ZN-LLDPE) blends have been studied in detail. The HDPE content of the blends was kept constant at 40 wt% and the LDPE/ZN-LLDPE ratio was varied from 0.5 to 2. Rheological measurements confirmed the melt miscibility of the entire blends. Study of the crystalline structure of the blends using DSC, wide angle X-ray scattering, small angle X-ray scattering and field emission SEM techniques revealed the formation of two distinct co-crystals in the blends. Fine LDPE/ZN-LLDPE co-crystals, named tie crystals, dispersed within the amorphous gallery between the coarse HDPE/ZN-LLDPE co-crystals were characterized for the first time in this study. It is shown that the tie crystals strengthen the amorphous gallery and play a major role in the mechanical performance of the blend
  6. Keywords:
  7. Blend ; Co-crystallization ; Polyethylene ; Blending ; Cobalt ; Crystal structure ; Crystallization ; Density (specific gravity) ; Linear low density polyethylenes ; Mechanical properties ; Polyethylenes ; Polymer blends ; X ray scattering ; Co-crystallizations ; Crystalline structure ; High density polyethylene(HDPE) ; Mechanical performance ; Polyethylene blends ; Properties improvements ; Rheological and mechanical properties ; Rheological measurements ; High density polyethylenes
  8. Source: Polymer International ; Volume 65, Issue 12 , 2016 , Pages 1405-1416 ; 09598103 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/pi.5191/abstract