Influence of reprocessing on the mechanical properties and structure of polyamide 6

Su, Kuan-Hua; Lin, Jia‐Horng; Lin, Chih-Ching

doi:10.1016/j.jmatprotec.2007.04.056

Cited by 94 publications

(75 citation statements)

References 27 publications

(37 reference statements)

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“…Also each reused material experienced a decrease in viscosity after This difference results from a decrease in the molecular weight, which is originated from degradation of polymer because of breaks in EVA 40W chains (extruded and pelletized). This behavior is similar to that reported by other authors [12].…”

Section: Resultssupporting

confidence: 93%

Evaluation of Rheological Behaviour upon Recycling of an Ethylene Vinyl Acetate Copolymer by Means of Twin-Screw Extrusion Process

ERGİN

Aydın

2017

Acta Phys. Pol. A

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Recycling of many polymers has gained a spectacular importance mainly because of its environmental and economical benefits. Ethylene vinyl acetate is one of the thermoplastics used directly as a final product and indirectly as an additive within many other polymeric materials. There has been limited research work on recycling of polymers even though recycling in industry has shown a spectacular growth in the last decade. It is the aim of this study to investigate and to evaluate the rheological behaviour of an ethylene-vinyl acetate copolymer resin upon recycling. For this purpose, original ethylene vinyl acetate granules were processed five cycles by using a twinscrew extruder and their rheological analysis was performed by means of an AR-G2 rheometer (TA Instruments), with a parallel-plate geometry, under a steady state condition. It was found that the rheological measurements of copolymer ethylene vinyl acetate exhibited a shear thinning constitutive behavior, obeying Carreau-Yasuda rheological constitutive model. The changes in flow and oscillatory shear measurements under different processing conditions were also determined in detail and results are reported in the paper.

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Section: Resultssupporting

confidence: 93%

Evaluation of Rheological Behaviour upon Recycling of an Ethylene Vinyl Acetate Copolymer by Means of Twin-Screw Extrusion Process

ERGİN

Aydın

2017

Acta Phys. Pol. A

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“…MFI remained unchanged up to the 5th processing cycle. From the 6th processing cycle, MFI increases with increasing processing cycles, indicating a possible reduction in the PA6 molar mass as a consequence of the thermomechanical stress acting on the molten polymer [5,9]. …”

Section: Methodsmentioning

confidence: 99%

“…This behavior can be related to the molar mass reduction as consequence of multiple processing cycles. Shorter molecular chain and broader chain length distribution could result in poor chain entanglements, resulting in loss of strength of the material [5]. From the 8th processing cycle, flexural strength and modulus tended to increase as compared to the sample submitted to the 7th processing cycle probably due to increase in crystallinity as a result of the decrease in molar mass [9].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Influence of reprocessing on the mechanical properties of polyamide 6 containing talc

Domingo¹,

Souza²

2016

AIP Conference Proceedings

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Abstract. In this study, polyamide 6 containing 30wt% talc was reprocessed via injection molding up to eight processing cycles. The effects of reprocessing on the mechanical properties and on the melt viscosity were analyzed by flexural and impact tests and by melt flow index (MFI) tests, respectively. Flexural strength and modulus remained unchanged up to the 5th processing cycle. From the 6th processing cycle, flexural strength and modulus decrease with increasing processing cycles. Similar trend was observed for impact strength, however, the decrease observed in this property was much lower. From the 6th processing cycle, MFI increases with increasing processing cycles, indicating a possible reduction in PA6 molar mass.

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“…The largest number of PA processing cycles was reported in study [17], in which the original PA6 was injection moulded 16 times; each time its mechanical and rheological properties were tested as a function of number of processing cycles. In [2,3], polypropylene was extruded 19 times, and its impact strength, basic static tensile strength properties such as tensile strength and stress at break, as well as its melt flow rate and viscosity were determined after each cycle.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multiple Processing of Polypropylene on Selected Properties of Injection Moulded Parts

Głogowska

Sikora

Dulebová

2016

Adv. Sci. Technol. Res. J.

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An injection moulding machine was used to produce injection moulded parts from polypropylene under invariant injection moulding conditions. Part of the injection mouldings were shredded and re-processed up to fifteen times. The mouldings and the shredded plastic were tested for selected strength properties: Young's modulus, maximum tensile stress, breaking stress, strain at maximum stress, strain at break, Shore hardness, impact strength, mass flow rate, and longitudinal and transverse shrinkage. Relevant relationships were identified and conclusions were drawn on the basis of the data obtained.

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Influence of reprocessing on the mechanical properties and structure of polyamide 6

Cited by 94 publications

References 27 publications

Evaluation of Rheological Behaviour upon Recycling of an Ethylene Vinyl Acetate Copolymer by Means of Twin-Screw Extrusion Process

Evaluation of Rheological Behaviour upon Recycling of an Ethylene Vinyl Acetate Copolymer by Means of Twin-Screw Extrusion Process

Influence of reprocessing on the mechanical properties of polyamide 6 containing talc

The Effect of Multiple Processing of Polypropylene on Selected Properties of Injection Moulded Parts

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