# Chapter 13: Structure of Polymer¶

## Exmple 13.1 Page 476¶

In :
#initiation of variable
m1 = 7500.0 # Mean molecular weight in g/mol
m2 = 12500.0 # Mean molecular weight in g/mol
m3 = 17500.0 # Mean molecular weight in g/mol
m4 = 22500.0 # Mean molecular weight in g/mol
m5 = 27500.0 # Mean molecular weight in g/mol
m6 = 32500.0 # Mean molecular weight in g/mol
m7 = 37500.0 # Mean molecular weight in g/mol
x1 = 0.05 # Mole fraction
x2 = 0.16 # Mole fraction
x3 = 0.22 # Mole fraction
x4 = 0.27 # Mole fraction
x5 = 0.20 # Mole fraction
x6 = 0.08 # Mole fraction
x7 = 0.02 # Mole fraction
w1 = 0.02 # weight fraction
w2 = 0.10# weight fraction
w3 = 0.18# weight fraction
w4 = 0.29# weight fraction
w5 = 0.26# weight fraction
w6 = 0.13# weight fraction
w7 = 0.02# weight fraction
m_c = 12.01 # molar mass of carbon in gram/mole
m_h = 1.01 # molar mass of hydrogen in gram/mole
m_cl = 35.45 # molar mass of chlorine in gram/mole

# Part A:
#calculation
M_n = m1*x1+m2*x2+m3*x3+m4*x4+m5*x5+m6*x6+m7*x7

#result
print" The number average molecular weight is %d gram/mol" %M_n

#Part B:
m = 2*m_c+3*m_h+1*m_cl # Mass of repeating unit
DP = M_n/m

#result
print" The degree of polimarization is %d " %DP

#Part C:
M_w = m1*w1+m2*w2+m3*w3+m4*w4+m5*w5+m6*w6+m7*w7

#result
print" The weight average molecular weight is %d gram/mol" %M_w

 The number average molecular weight is 21150 gram/mol
The degree of polimarization is 338
The weight average molecular weight is 23200 gram/mol