Polymerization rates were proportional to initial Sn(Oct) 2 concentration at low [Sn(Oct) 2 ] 0 /[PrOH] 0 values, but began to level off at higher values. When [Sn(Oct) 2 ] 0 /[PrOH] 0 was significantly greater than unity, the opposite behavior occurred. Tin(II) alkoxide concentration became limited by the initial PrOH concentration and independent of initial Sn(Oct) 2 concentration. Addition of 2‐ethylhexanoic acid caused polymerization rate retardation, without affecting molecular weight. A control polymerization was conducted in the absence of PrOH. The molecular weight of the resulting polymer was consistent with the measured water content (3.7 wt % by Karl Fisher titration) of the as‐received Sn(Oct) 2 . The polymerization rate in the absence of PrOH was slow, and this suggested that water is less efficient than an alcohol in creating polymerization‐active stannyl ether bonds.
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Messman et al. (2004) studied this question.
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