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. 2021 Mar 9;13(5):838. doi: 10.3390/polym13050838

Table 1.

Homopolymerizations of myrcene, styrene and isoprene, using i-Bu3Al/NaH as initiating systems at 100 °C.

Run [a] Monomers feed [M,S,I][mol %] [NaH] [mon][NaH] Time [h] Yield [b] [%] MW [c] [KDa] Ð [e] Tg [d] [°C] Polymer Composition
and Microstructure [%]
M
[1,4/3,4/1,2]
S I
[1,4[cis]/3,4/1,2]
1 100,0,0 6.0 × 10−3 500 24 58 50.2 1.7 −61.8 100 [46/52/2] - -
2 [e] 100,0,0 6.0 × 10−3 500 24 7 264.9 1.7 n.d. 100 - -
7.9 1.7 n.d.
3 100,0,0 3.0 × 10−3 1000 72 85 79.6 1.7 n.d. 100 [49/48/3] - -
4 100,0,0 2.2 × 10−3 1450 72 40 89.3 2.0 −76.5 100 [51/47/2] - -
5 0,100,0 6.0 × 10−3 500 8 100 151.2 1.4 105.5 - 100 -
6 0,100,0 2.2 × 10−3 1450 8 91 285.1 1.5 n.d. - 100 -
7 0,0,100 6.0 × 10−3 500 12 40 24.9 1.5 n.d. - - 100 [30[53]/56/14]
8 0,0,100 6.0 × 10−3 500 24 74 33.4 1.5 −11.4 - - 100 [32[52]/55/13]
9 0,0,100 3.0 × 10−3 1000 24 55 59.1 1.6 −14.9 - - 100 [35[53]/54/11]

[a] Reactions were performed in toluene; (monomers) = 3.0; Al/Na = 0.8; tetrahydrofuran (THF)/Na = 50. [b] Conversion was determined by gravimetry. [c] Determined by size exclusion chromatography (SEC) in THF at 40 °C, calibrated with polystyrene standards. [d] Determined by DSC. [e] THF/Na = 0. N.d. = not determined.