麻省理工学院：《polymer engineering》mc crum 1 15

Mi(g/mol)wi(g) n i(mol) (W_D(M O 5000 6.67E-06 1500 27000 0.197.04E065130 39000 025641E069750 56000 0.173.04E-069520 78000 0.12 1.54E06 9360 104000 0.087.69E-07 8320 120000 0.06 5.00E-07 7200 153000 0.04 2.61E07 6120 Mn=38522 Mw=56337 M n=sum(n I*M_ D)/sum(n_I)=sum(w D)/sum(n_D) M w=sum(wI*M i/ sum(w D) 50000 100000150000 200000

M_i (g/mol) w_i (g) n_i (mol) (w_I)(M_I) 15000 0.1 6.67E-06 1500 27000 0.19 7.04E-06 5130 w_i 39000 0.25 56000 0.17 78000 0.12 104000 0.08 120000 0.06 153000 0.04 6.41E-06 9750 3.04E-06 9520 1.54E-06 9360 7.69E-07 8320 5.00E-07 7200 2.61E-07 6120 M_n = 38522 M_w = 56337 M_n = sum( n_I * M_I) / sum (n_I) = sum (w_I) / sum (n_I) M_w = sum (w_I * M_i) / sum (w_I) 0.3 0.25 0.2 0.15 0.1 0.05 0 0 50000 100000 150000 200000 M_i