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 in | Macromolecules Vol. 52; no. 14; pp. 5429 - 5441 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
American Chemical Society
23.07.2019
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0024-9297 1520-5835 1520-5835 |
| DOI | 10.1021/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. |
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| 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 givenname: Masoud orcidid: 0000-0001-5967-2459 surname: Razavi fullname: Razavi, Masoud – sequence: 2 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? |
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