Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone
Four metal tert-butoxides, namely: aluminum(III) tert-butoxide, Al(Ot-C 4H 9) 3, tin(II) tert-butoxide, Sn(Ot-C 4H 9) 2, titanium(IV) tert-butoxide, Ti(Ot-C...
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th-cmuir.6653943832-516362018-09-04T06:05:34Z Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone W. Meelua V. Bua-Own R. Molloy W. Punyodom Engineering Four metal tert-butoxides, namely: aluminum(III) tert-butoxide, Al(Ot-C 4H 9) 3, tin(II) tert-butoxide, Sn(Ot-C 4H 9) 2, titanium(IV) tert-butoxide, Ti(Ot-C 4H 9) 4, and lithium tert-butoxide, Li(Ot-C 4H 9), were used as initiators in the bulk ring-opening polymerization (ROP) of ε-caprolactone (CL). The polymerizations were carried out at 120 °C for 72 hrs. It was found that the Al(Ot-C 4H 9) 3 only partially dissolved in the CL monomer and gave a low % conversion. The Li(Ot-C 4H 9) initiator did not dissolve and gave no polymerization. In contrast, the Sn(Ot-C 4H 9) 2 initiator dissolved completely, albeit very slowly, and gave a high % conversion. The Ti(Ot-C 4H 9) 4 initiator was by far the easiest and quickest to dissolve and also gave a high % conversion. Consequently, Ti(Ot-C 4H 9) 4-initiated polymerization was studied further by dilatometry at 120 °C. From the kinetic results, a first-order rate constant, k p, of 0.120 l mol -1 min -1 was obtained. © (2012) Trans Tech Publications. 2018-09-04T06:05:34Z 2018-09-04T06:05:34Z 2012-05-15 Book Series 10226680 2-s2.0-84860821595 10.4028/www.scientific.net/AMR.506.142 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84860821595&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/51636 |
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Engineering W. Meelua V. Bua-Own R. Molloy W. Punyodom Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
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Four metal tert-butoxides, namely: aluminum(III) tert-butoxide, Al(Ot-C 4H 9) 3, tin(II) tert-butoxide, Sn(Ot-C 4H 9) 2, titanium(IV) tert-butoxide, Ti(Ot-C 4H 9) 4, and lithium tert-butoxide, Li(Ot-C 4H 9), were used as initiators in the bulk ring-opening polymerization (ROP) of ε-caprolactone (CL). The polymerizations were carried out at 120 °C for 72 hrs. It was found that the Al(Ot-C 4H 9) 3 only partially dissolved in the CL monomer and gave a low % conversion. The Li(Ot-C 4H 9) initiator did not dissolve and gave no polymerization. In contrast, the Sn(Ot-C 4H 9) 2 initiator dissolved completely, albeit very slowly, and gave a high % conversion. The Ti(Ot-C 4H 9) 4 initiator was by far the easiest and quickest to dissolve and also gave a high % conversion. Consequently, Ti(Ot-C 4H 9) 4-initiated polymerization was studied further by dilatometry at 120 °C. From the kinetic results, a first-order rate constant, k p, of 0.120 l mol -1 min -1 was obtained. © (2012) Trans Tech Publications. |
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Book Series |
author |
W. Meelua V. Bua-Own R. Molloy W. Punyodom |
author_facet |
W. Meelua V. Bua-Own R. Molloy W. Punyodom |
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W. Meelua |
title |
Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
title_short |
Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
title_full |
Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
title_fullStr |
Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
title_full_unstemmed |
Comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
title_sort |
comparison of metal alkoxide initiators in the ring-opening polymerization of caprolactone |
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2018 |
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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84860821595&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/51636 |
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