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Poelmans, Kevin
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article
Undecyltin trichloride grafted onto cross-linked polystyrene
Abstract
<p>The activity, recyclability, and chemical stability as a catalyst of undecyltin trichloride grafted to cross-linked polystyrene, [P-H] <sub>(1-t)</sub>[P-(CH<sub>2</sub>)n-SnCl<sub>3</sub>]<sub>t</sub>, with [P-H] the monomelic unit of the nonfunctionalized polymer and t the organotin-functionalized monomer fraction, are assessed in the ring-opening polymerization (ROP) of ε-caprolactone. Quantitative conversion is obtained within 2 h under conditions in which conversion is by far incomplete for two other organotin grafts, [P-H]<sub>(1-t)</sub>[P-(CH<sub>2</sub>) <sub>11</sub>-SnBuCl<sub>2</sub>]<sub>t</sub> and [P-H]<sub>(1-t)</sub>{[P- (CH<sub>2</sub>)<sub>11</sub>-SnBuCl]<sub>2</sub>O}<sub>t/2</sub>. Even after 15 min of reaction, conversions of at least 70% are achieved for the grafted tin trichloride. The catalytic reactions of the grafted undecyltin trichloride, more particularly its chemical integrity and recycling ability, are monitored, in situ, at the solid-liquid interface, using high-resolution magic angle spinning (HR-MAS) <sup>1</sup>H and <sup>119</sup>Sn NMR. Residual tin contents in the reaction products were assessed by inductively coupled plasma/atomic emission spectroscopy (ICP//AES). The polydispersity index of the synthesized poly(ε-caprolactone), investigated with size exclusion chromatography, is closer to unity than for grafted tin dichloride catalysts.</p>