Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene

Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene

Blends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversion of PLLA components into cyclic monomers, lactides, using magnesium oxide (MgO) as a depolymerizat...

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Main Authors: Haruo Nishida, Yoshiro Arazoe, Takayuki Tsukegi, Wang Yan, Yoshihito Shirai
Format: Article
Language:English
Published: Hindawi Limited 2009-01-01
Series:International Journal of Polymer Science
Online Access:http://dx.doi.org/10.1155/2009/287547
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spelling doaj-ab34aa39561d4c62951f29973999ce5b2020-11-24T22:54:15ZengHindawi LimitedInternational Journal of Polymer Science1687-94221687-94302009-01-01200910.1155/2009/287547287547Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with PolypropyleneHaruo Nishida0Yoshiro Arazoe1Takayuki Tsukegi2Wang Yan3Yoshihito Shirai4Eco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Hibikino 2-4, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, JapanDepartment of Biological Functions and Engineering, Kyushu Institute of Technology, Hibikino 2-4, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, JapanEco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Hibikino 2-4, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, JapanDepartment of Biological Functions and Engineering, Kyushu Institute of Technology, Hibikino 2-4, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, JapanEco-Town Collaborative R&D Center for the Environment and Recycling, Kyushu Institute of Technology, Hibikino 2-4, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, JapanBlends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversion of PLLA components into cyclic monomers, lactides, using magnesium oxide (MgO) as a depolymerization catalyst. Obviously, the catalyst MgO selectively accelerated only the PLLA depolymerization in the blends, dominantly generating L,L-lactide as a volatile product and separating the PP component. Expected effects of homolysis in the blend system were also determined as slight changes in activation energy of degradation for both the components and through the suppression of degradation by an antioxidant.http://dx.doi.org/10.1155/2009/287547
collection DOAJ
language English
format Article
sources DOAJ
author Haruo Nishida
Yoshiro Arazoe
Takayuki Tsukegi
Wang Yan
Yoshihito Shirai
spellingShingle Haruo Nishida
Yoshiro Arazoe
Takayuki Tsukegi
Wang Yan
Yoshihito Shirai
Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
International Journal of Polymer Science
author_facet Haruo Nishida
Yoshiro Arazoe
Takayuki Tsukegi
Wang Yan
Yoshihito Shirai
author_sort Haruo Nishida
title Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
title_short Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
title_full Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
title_fullStr Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
title_full_unstemmed Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
title_sort selective depolymerization and effects of homolysis of poly(l-lactic acid) in a blend with polypropylene
publisher Hindawi Limited
series International Journal of Polymer Science
issn 1687-9422
1687-9430
publishDate 2009-01-01
description Blends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversion of PLLA components into cyclic monomers, lactides, using magnesium oxide (MgO) as a depolymerization catalyst. Obviously, the catalyst MgO selectively accelerated only the PLLA depolymerization in the blends, dominantly generating L,L-lactide as a volatile product and separating the PP component. Expected effects of homolysis in the blend system were also determined as slight changes in activation energy of degradation for both the components and through the suppression of degradation by an antioxidant.
url http://dx.doi.org/10.1155/2009/287547
work_keys_str_mv AT haruonishida selectivedepolymerizationandeffectsofhomolysisofpolyllacticacidinablendwithpolypropylene
AT yoshiroarazoe selectivedepolymerizationandeffectsofhomolysisofpolyllacticacidinablendwithpolypropylene
AT takayukitsukegi selectivedepolymerizationandeffectsofhomolysisofpolyllacticacidinablendwithpolypropylene
AT wangyan selectivedepolymerizationandeffectsofhomolysisofpolyllacticacidinablendwithpolypropylene
AT yoshihitoshirai selectivedepolymerizationandeffectsofhomolysisofpolyllacticacidinablendwithpolypropylene
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