Injection Molding of Low-Density Polyethylene (LDPE) as a Model Polymer: Effect of Molding Parameters on the Microstructure and Crystallinity
| Autor: | María Zenaida Saavedra-Leos, Yael Estrada-Ávila, Iñaki Espelosín-Gómez, César Leyva-Porras, Claudia Piñón-Balderrama, Andrea Balderrama-Aguilar, Iván Alziri Estrada-Moreno, M. E. Mendoza-Duarte |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
ANOVA Materials science Polymers and Plastics injection molding Scanning electron microscope microstructure Organic chemistry General Chemistry Polymer Molding (process) Polyethylene Microstructure Article low-density polyethylene (LDPE) response surface methodology Crystallinity Low-density polyethylene chemistry.chemical_compound QD241-441 chemistry Spherulite spherulites Composite material |
| Zdroj: | Polymers Volume 13 Issue 20 Polymers, Vol 13, Iss 3597, p 3597 (2021) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym13203597 |
| Popis: | Due to its relatively simple structure, low-density polyethylene (LDPE) can be considered as a model polymer for the study of its properties. Herein, the effect of processing variables on the microstructure and crystallinity of injection-molded LDPE specimens was quantitatively determined. The polymer was injected at different temperature conditions in the barrel and the mold. The specimens were characterized by scanning electron microscopy and X-ray diffraction. With the data obtained, an analysis of variance (ANOVA) was carried out, and response surface graphs (SRP) were constructed to quantify and to observe the behavior of the processing variables, respectively. Different models were obtained to predict the effect of the experimental factors on the response variables. The results showed that the interaction of the two temperatures has the greatest effect on the size of the spherulite, while the temperature of the mold affects the crystallinity. The SRP showed different behaviors: for the spherulite, the size increases with the mold temperature, while for the crystallinity, higher values were observed at an intermediate mold temperature and a low melt temperature. The results presented herein are valuable for setting empirical relations between the microstructure, crystallinity, and the molding conditions of LDPE. |
| Databáze: | OpenAIRE |
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