Effects of compatibilizer and testing speed on the mechanical and morphology behaviors of co-continuous amorphous copolyester-polyoxymethylene blends

Abstract

Co-continuousamorphous copolyester (PETG)/ polyoxymethylene (POM) (50/50 wt%/wt%) blends were prepared using a twin screw extruder followed compression molding. Two types of thermoplastic polyurethane (TPU) (i.e., polyester-based and polyether-based) were used to compatibilize the blends system. The thermal properties were characterized by using differential scanning calorimetry (DSC). The mechanical properties of the co-continuous PETG/POM blends were studies through flexural and single-edge notch tensile test (SEN-T). The SEN-T test was performed at three different testing speeds; 1, 100, and 500 mm/min. Scanning electron microscope (SEM) was used to access the fracture surface morphology. The flexural strength of the PETG/POM blends was decreased in the presence of TPU. This was attributed to the elastomeric nature of the TPU. The compatibilizing effects of TPU on the PETG/POM blends were proven by moderate improvement in the fracture toughness and confirmed by the SEM observation. The SEN-T fractured surface of the compatibilized blends showed gross matrix shear yielding as compared to the uncompatibilized system. The K c values of the PETG/ POM blends decreased as the testing speed increased. The optimum toughening effect was observed in PETG/ POM blends compatibilized with polyether-based TPU at testing speed of 100 mm/min. The polyether-based TPU is a more efficient compatibilizer, because the amount required is one-half that of the polyester-based counterpart to achieve the same K c value. This was attributed to the elastomeric nature of the polyether-based TPU. The softer nature of polyether-based TPU could provide better toughening effect than the polyester-based TPU, which is relatively harder in nature. POLYM. ENG. SCI., 45: 710 -719, 2005.

Effects of compatibilizers and testing speeds on the mechanical properties of organophilic montmorillonite filled polyamide 6/polypropylene nanocomposites

“…In the presence of organoclay, the segmental mobility of the polymer molecules and the plastic deformation process in the form of crazing and shear yielding are very much restricted at high deformation rates. The reduction of toughness of the materials with increasing testing speed was also reported for core‐shell rubber toughened PBT blends [23] and PETG/POM/TPU blends [24]. The increase in K IC value observed in the PA6/PP/4C‐MMT with increasing the testing speed may be attributed to the plasticizing effect caused by high content of organic modifier (octadecylamine) in the commercial organo‐MMT, i.e., 34%.…”

Additive manufacturing of polyethylene terephthalate glycol /carbon fiber composites: An experimental study from filament to printed parts

“…The cooling cycle reveals no endothermic peak, indicating that the material is completely amorphous, also proven by the absence of melting peak in the heating cycle. 22,24

Figure 6.DSC results: (a) PETGp vs. PETGf; (b) rPETGp vs. rPETGf; (c) rPETGp vs. PETGp; (d) rPETGf vs. PETGf.

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“…These are ideal properties for FFF printing, benefiting from high stability. 22 Kattan et al. 24 studied the difference of crystallinity between PET and PETG and found that the first can crystalize up to 40% while PETG can barely go up to 3%.…”

“…For this work, PETG and PETG+CF were selected as the basis material for characterization due to its printing stability (no warping and easy processability). 22

Figure 1.Experimental work characterization/graphic abstract.

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A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

“…The tensile strength and elongation at break of pure PP are 37.79 MPa and 9%, respectively, while these values for SBS are 25.14 MPa and 687%, respectively. The tensile stress at 100% of SBS is 4.64 MPa but pure PP had no numerical value because the tensile rate is too fast for rigid PP . Tensile stress at 100% is inversely proportional to SBS content.…”