Effect of Processing Techniques on the Microstructure and Mechanical Performance of High-Density Polyethylene
| Autor: | Sultan Al Hassanieh, Abdel-Hamid I. Mourad, Mohamed Rabia, Edgar B. Mejia, Nizamudeen Cherupurakal |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Scanning electron microscope injection molding high-density polyethylene compression molding microstructure mechanical properties Organic chemistry Compression molding General Chemistry Molding (process) Polyethylene Microstructure Article Crystallinity chemistry.chemical_compound QD241-441 Differential scanning calorimetry chemistry High-density polyethylene Composite material |
| Zdroj: | Polymers; Volume 13; Issue 19; Pages: 3346 Polymers Polymers, Vol 13, Iss 3346, p 3346 (2021) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym13193346 |
| Popis: | The versatility of high-density polyethylene (HDPE) makes it one of the most used polymers for vast applications ranging from food packaging to human implants. However, there still is confusion regarding the proper selection of processing techniques to produce HDPE specimens for high-end applications. Herein, we compare the processing of HDPE by two relevant techniques: compression and injection molding. The fabricated samples were studied using uniaxial tensile testing to determine their mechanical performance. Furthermore, the microstructure of samples was analyzed using different characterization techniques. Compression-molded specimens recorded a higher degree of crystallinity (DC) using two different characterization techniques such as differential scanning calorimetry (DSC) and X-ray diffraction (XRD). With this information, critical processing factors were determined, and a general structure–property relationship was established. It was demonstrated that having a higher DC resulted in higher yield strength and Young’s modulus. Furthermore, premature failure was observed in the injection-molded specimens, resulting in lower mechanical performance. This premature failure was caused due to flow marks observed using scanning electron microscopy (SEM). Therefore, it is concluded that compression molding produces superior samples compared to injection molding. |
| Databáze: | OpenAIRE |
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