1 Ocak 1997 Dergi makalesi Açık Erişim

Ozarslan, O; Yilmaz, T; Yildiz, E; Fiedeldei, U; Kuyulu, A; Gungor, A

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  "@id": 104147, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "name": "Ozarslan, O"
    }, 
    {
      "@type": "Person", 
      "name": "Yilmaz, T"
    }, 
    {
      "@type": "Person", 
      "name": "Yildiz, E"
    }, 
    {
      "@type": "Person", 
      "name": "Fiedeldei, U"
    }, 
    {
      "@type": "Person", 
      "name": "Kuyulu, A"
    }, 
    {
      "@type": "Person", 
      "name": "Gungor, A"
    }
  ], 
  "datePublished": "1997-01-01", 
  "description": "The synthesis of N,N'-bis(4'-amino-4-biphenylene) isophthalamide (BABPI) and its applicability as a new diamine for the preparation of a series of new, high T-g, perfectly alternating poly(amide-imide)s is described. BABPI was synthesized from the catalytic reduction of the corresponding dinitro compound which was prepared by the condensation of isophthaloyl chloride and 4-amino-4'-nitrobiphenyl. The modified selective reduction technique was used for the preparation of 4-amino-4'-nitrobiphenyl from 4,4'-dinitro-biphenyl. Poly(amide-imide)s were synthesized by polycon densation of diamine BABPI with various commercially available aromatic dianhydrides via a conventional two-step procedure. In the first step, poly(amic-acid)s were prepared in a polar aprotic solvent, such as N-methyl pyrrolidone (NMP) at room temperature. Depending on the dianhydride used, intrinsic viscosities of poly(amic-acid)s were found to range between 0.43-0.69 dL/g. Bulk thermal imidization technique was used to obtain fully imidized poly(amide-imide)s at the second step. The synthesized poly(amide-imide)s showed good thermal stability up to 320 degrees C and the 10% weight loss temperatures were recorded in the range of 525-550 degrees C as evidenced by thermogravimetric analysis (TGA). The glass transition temperatures were found to be between 225-235 degrees C from differential scanning calorimeter (DSC) measurements. (C) 1997 John Wiley & Sons, Inc.", 
  "headline": "The preparation of perfectly alternating poly(amide-imide)s via amide unit containing new diamine", 
  "identifier": 104147, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "The preparation of perfectly alternating poly(amide-imide)s via amide unit containing new diamine", 
  "url": "https://aperta.ulakbim.gov.tr/record/104147"
}