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Effect of chemical treatment of Teflon powder on the properties of polyamide 66/Teflon composites prepared by melt mixing

Shojaei, A ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1007/s13233-011-0612-7
  3. Publisher: 2011
  4. Abstract:
  5. The surface defluorination of Teflon in powdery form was performed using a chemical treatment. The reaction parameters including the reaction time, sodium, naphthalene concentrations were optimized using a Taguchi method to obtain maximum functionality on the particles surface. The surface functionality of the treated particles was analyzed by FTIR, energy dispersive X-ray analysis (EDX) and surface energy. Both treated (g-PTFE) and untreated (PTFE) Teflon were added to polyamide 66 (PA66) at various loadings up to 6 wt%. Mechanical, differential scanning calorimetry (DSC) and tribological analyses for different PA66/Teflon composites were carried out. The chemical treatment enhanced the surface energy and polarity of Teflon and facilitated the breakdown of agglomerates leading to a uniform dispersion of g-PTFE and improved interaction with the PA66. Accordingly, PA66/g-PTFE showed better mechanical properties at a higher Teflon content with respect to PA66/PTFE composites. DSC showed that Teflon had no effect on the temperature and enthalpy of crystallization. In addition, g-PTFE decreased the friction coefficient of PA66 and improved the wear resistance considerably compared to untreated Teflon. [InlineMediaObject not available: see fulltext.]
  6. Keywords:
  7. Polyamide ; Teflon ; Chemical treatments ; Defluorination ; Effect of chemicals ; Energy dispersive x-ray ; Friction coefficients ; FTIR ; InlineMediaObject ; Melt mixing ; Polyamide 66 ; Polymer composite ; Reaction parameters ; Surface functionalities ; Teflon powders ; Uniform dispersions ; Agglomeration ; Differential scanning calorimetry ; Friction ; Functional polymers ; Interfacial energy ; Naphthalene ; Sodium ; Surface chemistry ; Taguchi methods ; Wear resistance ; Polytetrafluoroethylenes
  8. Source: Macromolecular Research ; Volume 19, Issue 6 , June , 2011 , Pages 613-621 ; 15985032 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs13233-011-0612-7