Table 1.

Comparison of PSU molecular masses in varying conditions

EntryConditionsMw (kDa)*Mn (kDa)*PDI*
11 eq PC, 1.05 eq Li2CO3, 1 eq ArF19111.82
21 eq PC, 1.05 eq K2CO3, 1 eq ArF16; 307.4; 272.09; 1.13
31 eq PC, 1.05 eq K2CO3 (18 h), 1 eq ArF (18 h)<1<1ND
41 eq PC, 1.05 eq K2CO3, 1 eq ArF (multigram scale)20101.94
51 eq BPA, 1.05 eq K2CO3, 1 eq ArF70431.63
61 eq PC, 3.6 eq K2CO3, 1 eq ArF4.52.61.73
71 eq CD pieces, 1 eq K2CO3, 1 eq ArF20111.73
  • ArF, 4,4′-difluorodiphenylsulfone; CD, compact disk; Mw, molecular weight; ND, not determined; PDI, polydispersity index.

  • * Measured by GPC against polystyrene standards.

  • Absolute molecular mass measured by GPC coupled with a light scattering detector; differential index of refraction, dn/dc (PSU) = 0.156 [Mw (PC) = 23 kDa; Mn (PC) = 20 kDa; PDI = 1.16; dn/dc (PC) = 0.186].