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      Cross-linked main-chain polybenzoxazine nanofibers by photo and thermal curing; stable at high temperatures and harsh acidic conditions

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      Author
      Ertaş, Yelda
      Uyar, Tamer
      Date
      2016-02
      Source Title
      Polymer
      Print ISSN
      0032-3861
      Publisher
      Elsevier
      Volume
      84
      Pages
      72 - 80
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In this study, for the first time cross-linking of linear aliphatic diamine-based main-chain polybenzoxazine (MCPBz) electrospun nanofibers were accomplished by two-step approach consisting of photo and thermal curing. Initially, two novel MCPBz resins which comprise of a benzophenone unit in the polymer main-chain were synthesized and uniform MCPBz nanofibers were produced by electrospinning. At first step, photo curing was performed by free radical polymerization initiated by UV-light and thermal stability of nanofibers was enhanced. At second step, thermal curing was carried out at different temperatures (150-225 °C) and ring opening and cross-linking of benzoxazine groups in the fiber structure were achieved. After two-step curing, cross-linked MCPBz nanofibers were obtained as free-standing material with good mechanical properties. Moreover, it was shown that these two cross-linked MCPBz nanofibers were structurally stable and maintained their fibrous morphology at high temperatures (400 °C), in good solvents (chloroform, DMF, 1,4-dioxane, DMAc, THF) and highly concentrated strong acids (HCl, HNO3, H2SO4).
      Keywords
      Cross-linked
      Electrospinning
      Main-chain polybenzoxazine
      Nanofibers
      Photo curing
      Thermal curing
      Permalink
      http://hdl.handle.net/11693/36783
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.polymer.2015.12.026
      Collections
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Nanotechnology Research Center (NANOTAM) 1006
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