Improving Processing, Crystallization, and Performance of Poly-l -lactide with an Amide-Based Organic Compound as Both Plasticizer and Nucleating Agent
| Autor: | Nils Leoné, Sarah Saidi, Gijs W. de Kort, Carolus H. R. M. Wilsens, Manta Roy, Daniel Hermida-Merino |
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| Přispěvatelé: | Biobased Materials, RS: FSE Biobased Materials, Sciences, RS: FSE Sciences, RS: FSE AMIBM, AMIBM, Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), Université de Lorraine (UL)-CentraleSupélec, DUBBLE, European Synchrotron Radiation Facility (ESRF) |
| Rok vydání: | 2019 |
| Předmět: |
Poly l lactic acid
General Chemical Engineering HYDRAZIDE COMPOUND Nucleation macromolecular substances 02 engineering and technology 010402 general chemistry 01 natural sciences Organic compound law.invention lcsh:Chemistry ISOTACTIC-POLYPROPYLENE chemistry.chemical_compound stomatognathic system law Amide Tacticity Poly-L-lactide Polymer chemistry Crystallization ComputingMilieux_MISCELLANEOUS POLY(LACTIC ACID) MELT chemistry.chemical_classification technology industry and agriculture Plasticizer MECHANICAL-PROPERTIES General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences POLY(L-LACTIC ACID) lcsh:QD1-999 chemistry [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] OXALAMIDE COMPOUNDS ORIENTATION 0210 nano-technology BEHAVIOR TRANSITION |
| Zdroj: | Acs omega, 4(6), 10376-10387. American Chemical Society ACS Omega, Vol 4, Iss 6, Pp 10376-10387 (2019) 'ACS Omega ', vol: 4, pages: 10376-10387 (2019) ACS Omega ACS Omega, ACS Publications, 2019, 4 (6), pp.10376-10387. ⟨10.1021/acsomega.9b00848⟩ |
| ISSN: | 2470-1343 |
| Popis: | In this work, we report on a novel hydrogen-bonding compound, N,N'-bis(2-hydroxyethyl)-terephthalamide (BHET), and its potential as additive in poly-L-lactide (PLA). Although the hydroxyl groups of BHET can participate in transesterification with the PLA matrix, we demonstrate through gel permeation chromatography that extrusion at 200 degrees C does not result in a drastic decrease in molecular weight. When dissolved in the PLA matrix, BHET facilitates a plasticizing effect, indicated by a suppression in both melt viscosity and glass-transition temperature. Additionally, BHET can crystallize from the PLA melt during cooling, where the generated BHET crystals facilitate heterogeneous nucleation of the PLA matrix. In general, BHET crystallization is favored at high undercooling/superstaturation, as this yields BHET crystals with a high surface area-to-volume ratio. However, rapid cooling to temperatures below the glass-transition temperature prevents the crystallization of the BHET, effectively yielding samples where only the plasticizing effect of BHET is evident. A suppression in yield point is observed during mechanical analysis of samples with increasing BHET concentration, a characteristic feature for samples with decreasing glass-transition temperatures. In contrast, when allowed to crystallize during processing, BHET can be used to generate PLA crystals oriented along the flow direction, effectively enhancing the tensile modulus. Overall, the combined plasticizing and nucleating effect of BHET makes it a verstaile additive for controlled processing and performance of PLA. |
| Databáze: | OpenAIRE |
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