Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B
Heavy metals based catalysts and time taking conduction heating mode is a challenge in poly(l-) lactide (PLLA) synthesis. In this study PLLA has been synthesised under simultaneous cooling and microwave heating using biocatalyst. Effect of immobilised lipase concentrations, polymerisation times and...
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ftdoajarticles:oai:doaj.org/article:d6f5f6f464f64226bbbb47ec11122321 2023-05-15T13:32:27+02:00 Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B A. Bukhari M. Atta A. Idris 2017-03-01T00:00:00Z https://doi.org/10.3303/CET1756242 https://doaj.org/article/d6f5f6f464f64226bbbb47ec11122321 EN eng AIDIC Servizi S.r.l. https://www.cetjournal.it/index.php/cet/article/view/1653 https://doaj.org/toc/2283-9216 doi:10.3303/CET1756242 2283-9216 https://doaj.org/article/d6f5f6f464f64226bbbb47ec11122321 Chemical Engineering Transactions, Vol 56 (2017) Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 article 2017 ftdoajarticles https://doi.org/10.3303/CET1756242 2022-12-31T07:04:06Z Heavy metals based catalysts and time taking conduction heating mode is a challenge in poly(l-) lactide (PLLA) synthesis. In this study PLLA has been synthesised under simultaneous cooling and microwave heating using biocatalyst. Effect of immobilised lipase concentrations, polymerisation times and simultaneous cooling application was investigated in PLLA synthesis. Combination of techniques; intrinsic viscosity, proton nuclear magnetic resonance (HNMR), Fourier Transform Infrared Spectroscopy (FTIR) and Differential scanning calorimetry (DSC) was used to characterise PLLA. 8 % w/w biocatalyst relative to monomer was found an optimum concentration for ring opening l-lactide polymerisation. By the application of simultaneous cooling molar mass of PLLA was increased due to increased penetration of microwaves irradiations. PLLA of molar mass (M?) 56,125 g/mol with 50.3 % crystallinity having specific rotation of 145 deg.dm-1 g-1 cm3 was obtained in 8 h. Maximum 98 % monomer conversion was achieved in 8 h that is significantly short polymerisation time than several days of conventional heating. In toluene, 90 °C was found as optimum temperature for polymerisation at microwave power level of 200 W. Biocatalyst was recovered completely by centrifugation. Polymerisation reaction was faster due to rapid microwave energy transfer and increased stability of biocatalyst under simultaneous cooling. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 |
spellingShingle |
Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 A. Bukhari M. Atta A. Idris Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
topic_facet |
Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 |
description |
Heavy metals based catalysts and time taking conduction heating mode is a challenge in poly(l-) lactide (PLLA) synthesis. In this study PLLA has been synthesised under simultaneous cooling and microwave heating using biocatalyst. Effect of immobilised lipase concentrations, polymerisation times and simultaneous cooling application was investigated in PLLA synthesis. Combination of techniques; intrinsic viscosity, proton nuclear magnetic resonance (HNMR), Fourier Transform Infrared Spectroscopy (FTIR) and Differential scanning calorimetry (DSC) was used to characterise PLLA. 8 % w/w biocatalyst relative to monomer was found an optimum concentration for ring opening l-lactide polymerisation. By the application of simultaneous cooling molar mass of PLLA was increased due to increased penetration of microwaves irradiations. PLLA of molar mass (M?) 56,125 g/mol with 50.3 % crystallinity having specific rotation of 145 deg.dm-1 g-1 cm3 was obtained in 8 h. Maximum 98 % monomer conversion was achieved in 8 h that is significantly short polymerisation time than several days of conventional heating. In toluene, 90 °C was found as optimum temperature for polymerisation at microwave power level of 200 W. Biocatalyst was recovered completely by centrifugation. Polymerisation reaction was faster due to rapid microwave energy transfer and increased stability of biocatalyst under simultaneous cooling. |
format |
Article in Journal/Newspaper |
author |
A. Bukhari M. Atta A. Idris |
author_facet |
A. Bukhari M. Atta A. Idris |
author_sort |
A. Bukhari |
title |
Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
title_short |
Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
title_full |
Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
title_fullStr |
Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
title_full_unstemmed |
Synthesis of Poly(L-) Lactide under Simultaneous Cooling and Microwave Heating by using Immobilised Candida Antarctica Lipase B |
title_sort |
synthesis of poly(l-) lactide under simultaneous cooling and microwave heating by using immobilised candida antarctica lipase b |
publisher |
AIDIC Servizi S.r.l. |
publishDate |
2017 |
url |
https://doi.org/10.3303/CET1756242 https://doaj.org/article/d6f5f6f464f64226bbbb47ec11122321 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Chemical Engineering Transactions, Vol 56 (2017) |
op_relation |
https://www.cetjournal.it/index.php/cet/article/view/1653 https://doaj.org/toc/2283-9216 doi:10.3303/CET1756242 2283-9216 https://doaj.org/article/d6f5f6f464f64226bbbb47ec11122321 |
op_doi |
https://doi.org/10.3303/CET1756242 |
_version_ |
1766027207775354880 |