Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness

© 2015 Elsevier Ltd. All rights reserved. Polylactide (PL) finds its use in a wide variety of applications ranging from medical devices to engineering plastics. However, the use of PL is limited to certain applications due to its brittle characteristic and low heat distortion temperature, which indi...

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Main Authors: Sunan Tacha, Tinnakorn Saelee, Wootichai Khotasen, Winita Punyodom, Robert Molloy, Patnarin Worajittiphon, Puttinan Meepowpan, Kiattikhun Manokruang
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/44321
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-443212018-04-25T07:48:14Z Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness Sunan Tacha Tinnakorn Saelee Wootichai Khotasen Winita Punyodom Robert Molloy Patnarin Worajittiphon Puttinan Meepowpan Kiattikhun Manokruang Agricultural and Biological Sciences © 2015 Elsevier Ltd. All rights reserved. Polylactide (PL) finds its use in a wide variety of applications ranging from medical devices to engineering plastics. However, the use of PL is limited to certain applications due to its brittle characteristic and low heat distortion temperature, which indicate its poor mechanical and thermal properties, respectively. This present work demonstrated the toughening of PL by stereocomplexation adopting poly(d-lactide)-poly(ethylene glycol)-poly(d-lactide) (PDL-PEG-PDL) copolymers with various PDL segment length. The DSC results showed that the complete stereocomplexation was reached when 40 wt% copolymer was blended with poly(l-lactide) (PLL). In addition, the crystallization of PEG was interrupted and, thus, prohibited by either adding PDL or PLL in the system. AFM images showed that, for the first time, the stereocomplex crystallites (Sc-crystallites) formed by the enantiomer pairs were dispersed in a continuous amorphous phase of PL and the non-crystallizing PEG. The increase of PDL segment length in the copolymer leaded to the increase of the Sc-crystallite size, which, consequently, resulted in the increase of the tensile strength of the blended-films. Elongation at break of the films was found to rely on the determined amorphous area. To maximize the toughness of the films, the specific ratio of PDL and PEG segment length in the copolymer must be achieved to provide the optimum balance between Sc-crystallite size and % amorphous area. 2018-01-24T04:40:49Z 2018-01-24T04:40:49Z 2015-06-15 Journal 00143057 2-s2.0-84931262920 10.1016/j.eurpolymj.2015.06.015 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84931262920&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/44321
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Agricultural and Biological Sciences
spellingShingle Agricultural and Biological Sciences
Sunan Tacha
Tinnakorn Saelee
Wootichai Khotasen
Winita Punyodom
Robert Molloy
Patnarin Worajittiphon
Puttinan Meepowpan
Kiattikhun Manokruang
Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
description © 2015 Elsevier Ltd. All rights reserved. Polylactide (PL) finds its use in a wide variety of applications ranging from medical devices to engineering plastics. However, the use of PL is limited to certain applications due to its brittle characteristic and low heat distortion temperature, which indicate its poor mechanical and thermal properties, respectively. This present work demonstrated the toughening of PL by stereocomplexation adopting poly(d-lactide)-poly(ethylene glycol)-poly(d-lactide) (PDL-PEG-PDL) copolymers with various PDL segment length. The DSC results showed that the complete stereocomplexation was reached when 40 wt% copolymer was blended with poly(l-lactide) (PLL). In addition, the crystallization of PEG was interrupted and, thus, prohibited by either adding PDL or PLL in the system. AFM images showed that, for the first time, the stereocomplex crystallites (Sc-crystallites) formed by the enantiomer pairs were dispersed in a continuous amorphous phase of PL and the non-crystallizing PEG. The increase of PDL segment length in the copolymer leaded to the increase of the Sc-crystallite size, which, consequently, resulted in the increase of the tensile strength of the blended-films. Elongation at break of the films was found to rely on the determined amorphous area. To maximize the toughness of the films, the specific ratio of PDL and PEG segment length in the copolymer must be achieved to provide the optimum balance between Sc-crystallite size and % amorphous area.
format Journal
author Sunan Tacha
Tinnakorn Saelee
Wootichai Khotasen
Winita Punyodom
Robert Molloy
Patnarin Worajittiphon
Puttinan Meepowpan
Kiattikhun Manokruang
author_facet Sunan Tacha
Tinnakorn Saelee
Wootichai Khotasen
Winita Punyodom
Robert Molloy
Patnarin Worajittiphon
Puttinan Meepowpan
Kiattikhun Manokruang
author_sort Sunan Tacha
title Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
title_short Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
title_full Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
title_fullStr Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
title_full_unstemmed Stereocomplexation of PLL/PDL-PEG-PDL blends: Effects of blend morphology on film toughness
title_sort stereocomplexation of pll/pdl-peg-pdl blends: effects of blend morphology on film toughness
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84931262920&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/44321
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