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  1. #1

    Sep 2011
    83

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    ɡ ɡ ( ).
    :
    .


    :
    ѡ .
    :
    1 .
    2 .
    3 .
    4 ɡ .
    5 (- CH3) (- C2H5) .
    6 (- CH3) ɡ .



    () () CnH2n+2




    (2-4) ʡ (5-15) ɡ 61 .
    ɡ ɡ .




    IUPAC
    ---Ethene CH2= CH2 -104 -169
    --- Propene CH2= CH-CH3 -45 -185
    ---Butene CH2= CH-CH2-CH3 6.3 -185
    2- 2-Methyl Propene CH2= C = CH3 -7 -140
    ---Pentene CH2= CH-(CH2)2-CH3
    30 -138
    ---Hexene CH2= CH-(CH2)3-CH3 64 -140
    ---Heptene CH2= CH-(CH2)4-CH3 93 -119
    ---Octene CH2= CH-(CH2)5-CH3 121 -102
    ---Nonene CH2= CH-(CH2)6-CH3 146 -81
    ---Decene CH2= CH-(CH2)7-CH3 171 -66


    Fibres

    . natural fibres man made fibres.
    .
    : cellulosic fibres wood pulp viscose rayon cellulose acetate fibres artificial silk.
    Synthetic polymers Synthetic organic polyamide fibres Nylon Acrylic fibres Orlon Dralon Acrilan Ployester fibres Terrylene Dacron Trevira.
    yarn ropes.
    1905 1939 1948 1953.
    1992 18,3 ( 2,3 16 ) 1992 20,5 ( 18,7 1,74 60 ) .
    . .
    Synthetic Inorganic Fibres: :
    () Glass Fibres or Glass Wool.
    reinforcement .
    () Aluminium Silicate Fibres. 400 1200) .
    () * Carbon Fibres composites .



    3 : 12 50 .
    ʡ . . () 242 . 280 320 ( ) . ʡ . 25 40 ( ) 10 . ֡ ɡ .


  2. #2
      Eiman
    Jul 2011
    -
    14,750

    :

    Thanks
    .......

  3. #3

    Dec 2011
    292

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  4. #4

    Sep 2011
    83

    :


  5. #5

    Jul 2012
    5,302

    :



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