Why Is Crystalline Poly(lactic acid) Brittle at Room Temperature?

This work shows that the environmental-friendly biorenewable and biodegradable poly­(lactic acid) (PLLA) can be made to have superior mechanical and thermal characteristics and thus show promise to replace conventional petroleum-based polymers such as polyethylene terephthalate. Using time-resolved...

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Published inMacromolecules Vol. 52; no. 14; pp. 5429 - 5441
Main Authors Razavi, Masoud, Wang, Shi-Qing
Format Journal Article
LanguageEnglish
Published American Chemical Society 23.07.2019
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Online AccessGet full text
ISSN0024-9297
1520-5835
1520-5835
DOI10.1021/acs.macromol.9b00595

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Abstract This work shows that the environmental-friendly biorenewable and biodegradable poly­(lactic acid) (PLLA) can be made to have superior mechanical and thermal characteristics and thus show promise to replace conventional petroleum-based polymers such as polyethylene terephthalate. Using time-resolved polarized optical microscopy (POM), we have investigated how and why conventional crystallization tends to cause deterioration of ductility in semicrystalline PLLA. Specifically, the POM study based on partially crystallized PLLA samples promotes the idea that the spherulitic crystals are mechanically weaker than glassy noncrystalline domains whose cohesive strength stems from the chain networking because of intermolecular uncrossability. By removing the large spherulitic crystal formation and inducing nanocrystal formation through melt-stretching of PLLA in its amorphous state, we identified a completely transparent crystalline state of PLLA that is extremely tough and resistant against heat.
AbstractList This work shows that the environmental-friendly biorenewable and biodegradable poly­(lactic acid) (PLLA) can be made to have superior mechanical and thermal characteristics and thus show promise to replace conventional petroleum-based polymers such as polyethylene terephthalate. Using time-resolved polarized optical microscopy (POM), we have investigated how and why conventional crystallization tends to cause deterioration of ductility in semicrystalline PLLA. Specifically, the POM study based on partially crystallized PLLA samples promotes the idea that the spherulitic crystals are mechanically weaker than glassy noncrystalline domains whose cohesive strength stems from the chain networking because of intermolecular uncrossability. By removing the large spherulitic crystal formation and inducing nanocrystal formation through melt-stretching of PLLA in its amorphous state, we identified a completely transparent crystalline state of PLLA that is extremely tough and resistant against heat.
This work shows that the environmental-friendly biorenewable and biodegradable poly(lactic acid) (PLLA) can be made to have superior mechanical and thermal characteristics and thus show promise to replace conventional petroleum-based polymers such as polyethylene terephthalate. Using time-resolved polarized optical microscopy (POM), we have investigated how and why conventional crystallization tends to cause deterioration of ductility in semicrystalline PLLA. Specifically, the POM study based on partially crystallized PLLA samples promotes the idea that the spherulitic crystals are mechanically weaker than glassy noncrystalline domains whose cohesive strength stems from the chain networking because of intermolecular uncrossability. By removing the large spherulitic crystal formation and inducing nanocrystal formation through melt-stretching of PLLA in its amorphous state, we identified a completely transparent crystalline state of PLLA that is extremely tough and resistant against heat.
Author Razavi, Masoud
Wang, Shi-Qing
AuthorAffiliation College of Polymer Science and Engineering
AuthorAffiliation_xml – name: College of Polymer Science and Engineering
Author_xml – sequence: 1
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  orcidid: 0000-0001-5967-2459
  surname: Razavi
  fullname: Razavi, Masoud
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  givenname: Shi-Qing
  orcidid: 0000-0002-0572-7108
  surname: Wang
  fullname: Wang, Shi-Qing
  email: swang@uakron.edu
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Snippet This work shows that the environmental-friendly biorenewable and biodegradable poly­(lactic acid) (PLLA) can be made to have superior mechanical and thermal...
This work shows that the environmental-friendly biorenewable and biodegradable poly(lactic acid) (PLLA) can be made to have superior mechanical and thermal...
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SubjectTerms ambient temperature
biodegradability
brittleness
crystallization
heat
light microscopy
nanocrystals
petroleum
polyethylene terephthalates
polylactic acid
thermal properties
Title Why Is Crystalline Poly(lactic acid) Brittle at Room Temperature?
URI http://dx.doi.org/10.1021/acs.macromol.9b00595
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