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Homework Help: Poly(p-phenylene-2,6-benzobisoxazole) - Zylon

  1. Aug 25, 2010 #1
    I am researching polymers used in making Ballistic Vests and Zylon, Poly(p-phenylene-2,6-benzobisoxazole), is one of the polymers chosen.

    Basic Information/ Structure:
    http://www.matweb.com/search/datasheet.aspx?matguid=140045b4f06c4aea89f8900f4c7bb4fc&ckck=1"
    http://www.toyobo.co.jp/e/seihin/kc/pbo/gif/structure.jpg

    PBO is a thermosetting polymers however I cannot figure out how it can form cross-links or hydrogen bonds which make polymers thermosetting.

    So I was wondering how it forms crosslinks to make it a thermosetting polymer.

    And I also was wondering why it has such good flame retardancy, high limiting oxygen index and high decomposition temperature (650 C).

    I know that the oxygen and nitrogen in the oxazoline are partially negative which can act as hydrogen bonds acceptor but there are no positive hydrogen from what I can tell. I thought maybe the compound structure could change to form crosslinks or hydrogen bonds when heat treated but couldn't find information.


    Thank you.
     
    Last edited by a moderator: Apr 25, 2017
  2. jcsd
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