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Morphological and mechanical properties of polyamide 6/nanodiamond composites prepared by melt mixing: effect of surface functionality of nanodiamond

Karami, P ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1002/pi.5289
  3. Publisher: John Wiley and Sons Ltd , 2017
  4. Abstract:
  5. Surface chemistry of as-received nanodiamond (ND) was first tailored by dry thermal oxidation to obtain carboxylated ND (ND-COOH) and by wet chemistry to obtain ethylenediamine-functionalized ND (ND-EDA). Then, the surface-functionalized ND particles were dispersed in polyamide 6 (PA6) using the melt-mixing method. Transmission optical and scanning electron microscopies indicated a fine dispersion at low nanodiamond concentrations, e.g. 0.25 wt%, particularly with ND-EDA. Differential scanning calorimetry revealed that ND-EDA favoured the α-phase crystal and enhanced the degree of crystallinity of PA6. Experimental data indicated that ND-EDA had considerably improved tensile properties at low concentration of 0.25 wt% compared to ND-COOH, which was correlated to the fine dispersion and stronger and thicker interphase in the case of ND-EDA. It was also found that the toughness of PA6 was improved on incorporation of ND-EDA due to development of microcracking and crazing. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry
  6. Keywords:
  7. Functionalized ND ; Mechanical features ; Crazing ; Differential scanning calorimetry ; Dispersions ; Light transmission ; Mixing ; Scanning electron microscopy ; Surface chemistry ; Thermooxidation ; Degree of crystallinity ; Dry thermal oxidations ; Functionalized ; Low concentrations ; Mechanical feature ; Melt mixing ; Polyamide 6 ; Surface functionalities ; Nanodiamonds
  8. Source: Polymer International ; Volume 66, Issue 4 , 2017 , Pages 557-565 ; 09598103 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/full/10.1002/pi.5289