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{:(,"Molecular mass of",,"Mehtod of dete...

`{:(,"Molecular mass of",,"Mehtod of determination of"),(,"Polymer and PDI",,"molecular mass of polymer"),((A),"Number avg molecular mass "(bar(M)n),(p),"Light scattering and ultracentrifuge"),((B),"Weight avg molecular mass "(bar(M)w),(q),"osmotic pressure method"),((C),"PDI of natural polymer",(r),"PDI = 1"),((D),"PDI of synthetic polymer",(s),PDI gt 1):}`

Text Solution

Verified by Experts

The correct Answer is:
A-q; Bp; C-r; D-s
(A) Number avg molecular mass `(bar(M)n)` osmotic pressure method
(B) Weight avg molecular mass `(bar(M)n)` light scattering and ultracentrifuge methods
(C) = PDI of natural polymer PDI = 1
(D) PDI of synthetic polymer `PDI gt 1`
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Knowledge Check

  • The most suitable method for determination of the molecular mass of polymer is/are

    A
    Osmotic pressure
    B
    End group analysis
    C
    Elevation in boiling point
    D
    Depression in freezing point

  • The poly dispersity index of a polymer is 1.5. If its number average molecular mass is 30,000 calculate its weight average molecular mass

    A
    100 mass.
    B
    40000
    C
    20000
    D
    45000

  • The poly dispersity index (PDI) of a polymer is ( overline(M_(w)) = weight average molecular mass and overline(M_(n)) number average molecular mass)

    A
    the product of `overline(M_(n))` and `overline(M_(w))`
    B
    the sum of `overline(M_(n))` and `overline(M_(w))`
    C
    the difference between `overline(M_(w))` and `overline(M_(n))`
    D
    the ratio between `overline(M_(w))` and `overline(M_(n))`

    • Similar Questions

    Explore conceptually related problems

    If overline(M)_(e) is the weight average molecular weight and overline(M)_(e) is the number average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

    If overline(M)_(e) is the weight average molecular weight and overline(M)_(e) is the number average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

    (A) : Osmotic pressure method is the most suitable method to determine the number average molecular masses of polymers. (R) : Osmotic pressure can be accurately determined for polymer of high molecular mass as it is a colligative property.

    In the determination of number average molecular weight of polymers by osmotic pressure experiment, (pi//C) along Y-axis 'c' along X-axis graph, Y intercept i.e. (pi//c)_(0) is equal to

    Number average molecular weight (bar(M)_(n)) of polymers is determined by (a) Osmatic pressure method (b) End group analysis method (c) Light scattering method (d) Ultra centrifuge method

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