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Morphology development and mechanical properties of unsaturated polyester resin containing nanodiamonds

Hashemi, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/pi.5343
  3. Abstract:
  4. Unsaturated polyester/styrene (UP) resin was filled with nanodiamonds (NDs) containing carboxyl and methacrylate functionalities using mechanical mixing. Field emission SEM exhibited a uniform dispersion of tightly bound aggregates of nanosized spherical NDs with good interfacial interaction. Rheological measurements exhibited a step increment in the shear viscosity of a UP/ND suspension at 0.6 wt% ND resembling a percolation state at this loading. Shear viscosity data supported by dynamic mechanical analysis results suggested the development of effective ND particles in which ND aggregates were covered by only polyester macromolecules. Accordingly, the morphology of UP/ND composites approached a quasi-percolation state at 0.6 wt% in which effective ND particles were connected thoroughly, instead of direct ND−ND contact, forming a co-continuous polyester phase covering the ND particles. Based on such morphology, DSC and Fourier transform infrared analysis suggested the development of heterogeneous microgels in cured UP resin containing NDs which in turn governed the overall mechanical properties of the composites. © 2017 Society of Chemical Industry. © 2017 Society of Chemical Industry
  5. Keywords:
  6. Unsaturated polymers ; Nanodiamond ; Curing ; Dynamic mechanical analysis ; Mechanical properties ; Morphology ; Nanodiamonds ; Polymer blends ; Shear viscosity ; Solvents ; Aggregates ; Field emission SEM ; Fourier transform infra reds ; Interfacial interaction ; Morphology development ; Rheological measurements ; Uniform dispersions ; Unsaturated polyester ; Unsaturated polyester resin ; Polyester resins
  7. Source: Polymer International ; Volume 66, Issue 6 , 2017 , Pages 950-959 ; 09598103 (ISSN)
  8. URL: https://onlinelibrary.wiley.com/doi/pdf/10.1002/pi.5343