Table 1. Composition, Molecular Weight and Polydispersity Index of PBSTMG Copolymers.
|
x(PTMG) (mol %) |
|||||||
|---|---|---|---|---|---|---|---|
| sample | n(BDO):n(SA) | theoretical | experimental | Lna | Mn (×104 g/mol) | Mw (×104 g/mol) | Mw/Mn |
| PBS | 17.64 | 36.27 | 2.06 | ||||
| PBSTMG-5 | 1.14 | 5.00 | 5.16 | 18.38 | 9.49 | 15.30 | 1.61 |
| PBSTMG-10 | 1.08 | 10.00 | 10.24 | 8.77 | 8.66 | 14.70 | 1.70 |
| PBSTMG-15 | 1.02 | 15.00 | 16.95 | 4.90 | 12.23 | 32.55 | 2.66 |
| PBSTMG-20 | 0.96 | 20.00 | 22.18 | 3.51 | 8.89 | 34.24 | 3.85 |
| PBSTMG-30 | 0.84 | 30.00 | 33.68 | 1.97 | 11.99 | 32.97 | 2.75 |
| PBSTMG-40 | 0.72 | 40.00 | 44.74 | 1.24 | 11.97 | 29.82 | 2.49 |
| PBSTMG-50 | 0.60 | 50.00 | 56.31 | 0.78 | 17.74 | 40.85 | 2.30 |
| PBSTMG-60 | 0.48 | 60.00 | 66.47 | 0.50 | 6.62 | 16.74 | 2.53 |
| PBSTMG-70 | 0.36 | 70.00 | 77.18 | 0.30 | 5.07 | 7.93 | 1.56 |
a
The average sequence lengths of the PBS hard segments (Ln) were calculated from the molar fraction of PBS in the copolymers. Ln = 1/(1 – XPBS) – 1.