1975
DOI: 10.1002/pol.1975.170130915
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Stereoregulation in the polymerization of methyl α‐ethylacrylate by n‐BuLi in toluene

Abstract: The polymerization of methyl α‐ethylacrylate was carried out in toluene by n‐BuLi at various temperatures. The yield of the polymer decreased with increase in the polymerization temperature and at 30°C and above no polymer was obtained, indicating that the ceiling temperature of this monomer lay between 0 and 30°C. The isotacticity increased with an increase in the polymerization temperature and at 0°C a highly isotactic polymer was obtained. The fractionation of the polymer obtained at −78°C showed that the p… Show more

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Cited by 19 publications
(11 citation statements)
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“…This finding was corroborated with 13 C NMR analysis of PMEA in CDCl 3 at 25 °C where the quarternary carbon of the PMEA backbone exhibits primarily an rm triad sequence and smaller rr and mm signals of roughly equal size (Figures S8 and S9, Supporting Information). This contrasts the mostly syndiotactic microstructure reported following polymerization in THF at −78 °C using n ‐BuLi as initiator; it should be noted that only a 2% yield was reported and a 36:1 monomer to initiator ratio was used . PMMA is typically syndiotactic under these conditions .…”
Section: Discussioncontrasting
confidence: 58%
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“…This finding was corroborated with 13 C NMR analysis of PMEA in CDCl 3 at 25 °C where the quarternary carbon of the PMEA backbone exhibits primarily an rm triad sequence and smaller rr and mm signals of roughly equal size (Figures S8 and S9, Supporting Information). This contrasts the mostly syndiotactic microstructure reported following polymerization in THF at −78 °C using n ‐BuLi as initiator; it should be noted that only a 2% yield was reported and a 36:1 monomer to initiator ratio was used . PMMA is typically syndiotactic under these conditions .…”
Section: Discussioncontrasting
confidence: 58%
“… 1 H NMR spectrum (CDCl 3 , 25 °C) of PMEA homopolymer. The left inset enlarges the methyl ester proton peaks (3H per repeat unit, δ: 3.60–3.50 ppm) which provide qualitative insight on PMEA backbone tacticity ( I – isotactic, H – heterotactic, S – syndiotactic, as reported by Hatada et al) . The right inset enlarges the peak associated with two DPHLi end‐group methyl protons (6H per polymer chain, δ: 0.57–0.45 ppm) which was integrated versus the methyl ester protons for calculation of final PMEA M n .…”
Section: Results and Analysismentioning
confidence: 87%
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