Summary of the main properties of the synthesized poly(butadiene-co-myrcene) and poly(butadiene-co-farnesene).
| Runa | Theoretical terpeneb content-% | (Co)polymer compositions (experimental)c | Terpene weight fraction | A d | k app e | M w (kg mol−1) | Đ f | T g g(°C) | |
|---|---|---|---|---|---|---|---|---|---|
| Bd-% | Terpene-% | ||||||||
| PB1 | 0 | 100 | 0 | 0 | 364.4 | 165.5 | 85 | 1.9 | −107 |
| PBMy1 | 10 | 94.7 | 5.3 | 0.12 | 409.3 | 33.6 | 119 | 2.0 | −103 |
| PBMy2 | 25 | 87.9 | 12.1 | 0.26 | 114.5 | 30.9 | 164 | 2.5 | −99 |
| PBMy3 | 50 | 72.1 | 27.9 | 0.49 | 103.0 | 14.7 | 297 | 3.4 | −87 |
| PBMy4 | 75 | 47.9 | 52.1 | 0.74 | 83.8 | 12.6 | 560 | 3.7 | −79 |
| PMy | 100 | 0 | 100 | 1 | 109.7 | 5.1 | 1259 | 3.7 | −64 |
| PB2 | 0 | 100 | 0 | 0 | 242.9 | 165.4 | 53 | 2.8 | −106 |
| PBFa1 | 5 | 97.3 | 2.7 | 0.07 | 299.8 | 219.2 | n.d. | n.d. | −103 |
| PBFa2 | 10 | 94.9 | 5.1 | 0.12 | 228.0 | 140.6 | 59 | 1.9 | −101 |
| PBFa3 | 30 | 84.3 | 15.7 | 0.32 | 200.4 | 99.0 | 65 | 1.7 | −97 |
| PBFa4 | 50 | 63.1 | 36.9 | 0.53 | 291.3 | 89.4 | 115 | 2.1 | −88 |
| PBFa5 | 75 | 47.4 | 52.6 | 0.74 | 267.9 | 67.5 | 145 | 2.5 | −82 |
| PFa | 100 | 0 | 100 | 1 | n.d. | n.d. | 375 | 3.6 | −75 |
a
Synthesis of PBMy and PBFa carried out by an isothermal process, with temperatures of 70 °C and 60 °C respectively, maintaining constant stirring of 100 rpm. n.d. = not determined.
b
Theoretical molar (%) terpene content used for the synthesized of the copolymers.
c
Molar (%) compositions calculated via1H NMR.
d
Catalytic activity (kgpolymer/mol−1 h−1). Calculated after 2 h of reaction for poly(butadiene-co-myrcene) and after 30 min for poly(butadiene-co-farnesene).
e
Apparent first-order rate constant (L mol−1 min−1) calculated considering the kinetic law d[M]/dt = ka[Nd][M], where kapp = k[Nd], and from the plots ln(1 − x)−1 = f(t), where x is the conversion.
f
Dispersity index (Mw/Mn) calculated by SEC.
g
Determined by DSC.