An efficient, food contact accelerator for stereocomplexation of high-molecular-weight poly( -lactide)/ poly( -lactide) blend under nonisothermal crystallization
| Autor: | Zhong-Ming Li, Zheng-Chi Zhang, Ling Xu, Feng-Gang Bian, Gan-Ji Zhong, Yuan Chen, Jia-Zhuang Xu, Wenqiang Hua |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Lactide Polymers and Plastics Scanning electron microscope Organic Chemistry Intercalation (chemistry) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Miscibility 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity Lamella (surface anatomy) chemistry Chemical engineering law Polyhydroxy compound Materials Chemistry Crystallization 0210 nano-technology |
| Zdroj: | Polymer. 170:54-64 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2019.03.003 |
| Popis: | It is an effective strategy to improve the heat resistance of polylactide (PLA) via forming stereocomplex crystals (SCs) in poly( l -lactide) (PLLA)/poly( d -lactide) (PDLA) blend. In this work, pentearythritol (PENTA), which is an environment-friendly polyhydroxy compound for food packaging, is selected to facilitate the SC crystallization and suppress the HC crystallization for HMW PLLA/PDLA blend. Impressively, only 3 wt% PENTA is added, the exclusive SCs with high content (Xc,SC = 50%) can be obtained, which exhibits a high promotion efficiency of crystallization of SCs. Interestingly, with PENTA content ascending, the crystallinity of SCs increases drastically first and then in a relatively slow manner. Furthermore, Miscibility with high content of PENTA leads to a relatively looser packing of SC lamella in the blend confirmed by scanning electron microscope (SEM) due to intercalation of PENTA between crystal lamella. The mechanism of how PENTA facilitates the formation of SCs at molecular level is also proposed in this work. |
| Databáze: | OpenAIRE |
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