Tutorials 1 for principles of polymerizations course Michel Bouquey Exercice 1: polyaddition reaction



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Tutorials 1 step growth polymerization



Tutorials 1 for principles of polymerizations course  

 

Michel Bouquey 

 

Exercice 1: polyaddition reaction 

 

We consider the reaction between butane diol (BD) and toluene diisocyanate (TDI) 



 

1 – a: Write the chemical structure of the repeat unit and the ends of the chains which are 

possible to obtain depending on the stoechiometric ratio.  

1 – b: What is the name of this polymer family?  

1 – c: Determine the molar mass of the repeat unit  

1 – d: What is the relation between the number of repeat units (n) and the degree of 

polymerization (DP

n

) according to the stoechiometric ratio ? For each case, determine the 



expression of the mean molar mass (

𝑀

𝑛



̅̅̅̅ ) in function of n.  

 

 



2 – We want to synthezise 50g of this polymer with 3 different mean molar masses in number: 

𝑀

𝑛,1



̅̅̅̅̅̅ = 6500 𝑔/𝑚𝑜𝑙 ; 𝑀

𝑛,2


̅̅̅̅̅̅ = 13200 𝑔/𝑚𝑜𝑙 et 𝑀

𝑛,3


̅̅̅̅̅̅ = 21400 𝑔/𝑚𝑜𝑙.  

 

We work with the same number of isocyanate and alcool functions.  



Calculate for each case the mean degree of polymerization. 

 

To deduce: 



2 – a: the number of functions used in each reactions  

2 – b: The extent p of the reaction to achieve the goals 

2 – c: The quantities (g) of diol and diisocyanate to introduce in the reactor 

 

Considering now that we work out of  stoechiometric function (number of isocyanate and 



alcool functions is different) try to answer again to questions 2a, 2b and 2c 

 

 



 

 

 



 

 

M



1

 = 90 g/mol 

M

2

 = 174 g/mol 



 

HO

OH



NCO

OCN

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