Effect of blend composition and related morphology on the quasi-static fracture performance of LLDPE/PP blends

Rosales, Caren; Bernal, Celina Raquel; Pettarín, Valeria

doi:10.1016/j.polymertesting.2020.106598

Cited by 12 publications

(4 citation statements)

References 58 publications

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“…In a previous work, blends with different LDPE/PP ratios were studied. It was concluded that the 75:25 LDPE/PP ratio was the most promising blend, 26,27 which also happens to be the same as the PE/PP ratio found in MSW. However, none of these studies provided a solution to the problem of plastic waste.…”

Section: Introductionmentioning

confidence: 71%

Improving the Mechanical Performance of LDPE/PP Blends through Microfibrillation

Rosales

Aranburu

Otaegi

et al. 2022

ACS Appl. Polym. Mater.

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Polyolefins (polyethylene (PE) and polypropylene (PP)) are the most abundant polymers found in plastic solid waste. They are expensive to separate, and recycling them in the form of blends is not viable due to their immiscibility and incompatibility. Following the idea of the circular economy where waste is turned into raw materials for manufacturing technological products using minimum energy, a solution is proposed for the poor behavior of immiscible PE/PP blends by taking advantage of their immiscibility to transform them into microfibrillar composites (MFCs). PE/PP blends with an 80:20 content ratio were studied, emulating the ratio found in municipal waste. A microfibrillar structure was achieved through an unusual combination of common industrial processing techniques: extrusion, drawing, and injection. The performance of the resulting fibrillar materials was evaluated by means of tensile, fracture, and impact tests, and the results were compared with those of unstretched blends (UBs) with droplet morphology. The effect of adding a compatibilizer was also evaluated. The results were promising as the performance of the MFCs was much better than that of the nonfibrillated blends, and a synergistic effect between the addition of the compatibilizer and microfibrillation process was observed. It seems that this type of processing has great potential for large-scale application in immiscible recycled polyolefin blends in which the final properties can be improved by modifying their morphology, obviating the need to separate these polymers in mixed waste streams.

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Section: Introductionmentioning

confidence: 71%

Improving the Mechanical Performance of LDPE/PP Blends through Microfibrillation

Rosales

Aranburu

Otaegi

et al. 2022

ACS Appl. Polym. Mater.

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“…The third stage is that the specimen after necking is uniformly stretched again. Due to the close arrangement of molecular chains and the increase of interaction force, the stress must be further increased in order to make the displacement between microcrystals or molecules, and finally lead to the fracture of molecular chains and the destruction of materials 36–38 . The tensile strength is under the comprehensive influence of matrix enhancement, ductility changes as well as defect proliferation.…”

Section: Resultsmentioning

confidence: 99%

Morphology evolution and mechanical property enhancement of linear low‐density polyethylene by adding disentangled ultrahigh molecular weight polyethylene

Zhang

et al. 2021

Polymers for Advanced Techs

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Ultra‐high molecular weight polyethylene (UHMWPE) and linear low‐density polyethylene (LLDPE) with different ratios were melt‐blended in an internal mixer. Results of rheological tests and scanning electron microscopy indicate that the blends are well miscible in the range of small addition amount of UHMWPE. The content of UHMWPE is suggested to be less than 5.0 wt%, to guarantee good compatibility of biphasic blends. Differential scanning calorimetry studies indicate that co‐crystallization occurs between UHMWPE and LLDPE. The crystallinity increases with the increase of UHMWPE as a nucleating agent. As a result, an improvement in mechanical properties is achieved. When the addition amount of UHMWPE is 5.0 wt%, the impact strength, breaking elongation, Young's modulus, and tensile strength are significantly increased by 27%, 25%, 75%, and 21% respectively.

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“…However, most of the polymer pairs were immiscible and would lead to unsatisfactory phase transformation such as co-continuous structure. It is well known that the processing methods and the related devices have significant influence on the phase transformation of the processed materials and play important roles in the manipulation the microstructures of final products [ 35 , 38 , 39 ]. Wu et al [ 40 ] extruded immiscible linear low-density polyethylene (LLDPE)/polystyrene (PS) blends using the VE.…”

Section: Applications Of Elongational Flow Dominated Plasticizing and Convey Devicesmentioning

confidence: 99%

Recent Advances in Elongational Flow Dominated Polymer Processing Technologies

Yuan

Chen

2021

Polymers

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The continuous development of plasticizing conveying methods and devices has been carried out to meet the needs of the polymer processing industry. As compared to the conventional shear-flow-dominated plasticizing and conveying techniques, a new method for processing polymers based on elongational flow was proposed. This new method and the related devices such as vane extruders, eccentric rotor extruders and so on, exhibited multiple advantages including shorter processing time, higher mixing effectiveness, improved product performance and better adaptability to various material systems. The development of new techniques in the field of polymer material processing has opened up a broad space for the development of new plastic products, improved product performance and reduced processing costs. In this review, recent advances concerning the processing techniques based on elongational flow are summarized, and the broad applications in polymer processing as well as some future opportunities and challenges in this vibrant area are elucidated in detail.

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Effect of blend composition and related morphology on the quasi-static fracture performance of LLDPE/PP blends

Cited by 12 publications

References 58 publications

Improving the Mechanical Performance of LDPE/PP Blends through Microfibrillation

Improving the Mechanical Performance of LDPE/PP Blends through Microfibrillation

Morphology evolution and mechanical property enhancement of linear low‐density polyethylene by adding disentangled ultrahigh molecular weight polyethylene

Recent Advances in Elongational Flow Dominated Polymer Processing Technologies

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