Effect of Reaction Conditions on Chain Length

Подпись:Since, as we have seen v =

If the monomer concentration is kept constant then the kinetic chain length relationship is;

As the rate of polymerisation increases with increase in temperature the molecular weight will decrease:

v a [M]

Effect of Reaction Conditions on Chain Length

and

Consider the case of termination by combination.

The degree of polymerisation will be given by:

Подпись: 2RDі = 2v:

Подпись: і = -2fkd [I]

Effect of Reaction Conditions on Chain Length

і = к

 

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Examples for styrene in xylene using AZDN at 50°C and assuming f=l. [I] = 1 x 10"3 mole1 [M] = 1 mole litre"1

і = 17C (D1/2___________ (D1/2 ^

(1.2 x 1 (Г5 x 7.2 x 107)1/2 (1×10“3)’/2 [1] [2]

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