Effect of screw element type in degradation of polypropylene upon multiple extrusions

Canevarolo, Sebastião V.; Babetto, Ana Clélia

doi:10.1002/adv.10028

Cited by 39 publications

(43 citation statements)

References 13 publications

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“…Absorbance in the region of 1725 cm -1 and 3500 cm -1 indicated the presence of carbonyl and hydroxyl groups (De Paoli 2008; Cáceres and Canevarolo 2009), respectively, and the absorbance peak at 2722 cm -1 was related to angular molecular vibrations in CH and axial molecular vibrations in CH 3 , as suggested elsewhere (Cáceres and Canevarolo 2009; Babetto and Canevarolo 2002; Rabello and White 1997; Garton et al 1978). Comparison of these absorbances can be used to normalize IR spectra since these peaks are insensitive to the oxidative degradation of pure polypropylene (Wang et al 2011).…”

Section: Resultssupporting

confidence: 71%

A study of the controlled degradation of polypropylene containing pro-oxidant agents

2013

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Intentional degradation by pro-oxidant agents, many of which are metal-based, can result in uncertainty as to the time of biodegradation. Polyacetal (POM) is a thermoplastic polymer commercially classified as an engineering polymer and contains carbon, hydrogen and oxygen. The depolymerization of POM during processing can enhance thermal decomposition. The aim of this study was to investigate the controlled degradation of polypropylene induced by the degradation of POM or d2w®. Mixtures of polypropylene containing different concentrations of POM or d2w® were prepared by extrusion. The properties of the mixtures (blends) were evaluated based on the melt index (MFI), tensile properties, Fourier transform infrared spectroscopy (FTIR), Time inductive oxidation (OIT) and Thermogravimetric analysis (TGA). The two additives (POM and d2w®) enhanced the oxidative thermal degradation of polypropylene and the degradation of the polypropylene/POM mixture could be controlled by altering the POM concentration.

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Section: Resultssupporting

confidence: 71%

A study of the controlled degradation of polypropylene containing pro-oxidant agents

2013

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“…This phenomenon used to make controlled rheology PP. The amount of degradation can be controlled with screw design and the amount of oxygen in the extruder [106]. The degradation of PP during processing can be well modulated [107].…”

Section: -Degradation During Processingmentioning

confidence: 99%

Review on the thermo-oxidative degradation of polymers during processing and in service

Gijsman

2008

E-Polymers

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“…Dh r ðiÞ 0:05 ðD l ðiÞ < 0; and i > 1Þ: (22) Formula (22) means Dh r (i) % 0. In other words, if Formula (22) holds, the mechanism of degradation of PP is, or mainly is the mechanism of mechanochemical degradation.…”

Section: Discussion Of the Characteristic Indexes And The Characterismentioning

confidence: 99%

A real‐time study on the evolution of the degradation of polypropylene during mixing process

Wang

Nie

et al. 2011

J of Applied Polymer Sci

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A real-time study to the evolution of the mechanisms of degradation of both PP powder and PP granular during the mixing process was achieved. A quantitative analysis of combination of the rheological torque-time curves obtained by a Haake rheometer with FTIR spectra was made. The construction of a series of the characteristic functions of the torque-time curve and the FTIR characteristic functions for polypropylene (PP) made the real time and quantitative analysis relatively profound. By means of these characteristic functions, the characters of the mechanisms of thermooxidative degradation, and the mechanism of mechanochemical degradation for PP were investigated. Two criterions for the mechanism of thermooxidative degradation and the mechanism of mechanochemical degradation were obtained. In the thermooxidative treatment process and the mixing process, the necessary condition for the significant occurrence of thermooxidative degradation of PP is Dh r (i) > 0.05, whereas the sufficient condition for the significant occurrence of mechanochemical degradation is Dh r (i) 0.05 (D l (i) < 0, and i > 1). A detailed description of the evolutions of the degradations for both the PP granules in which an antideterionant was added and the PP powder without any antideterionant was made. The roles and the evolutions of both the mechanism of thermooxidative degradation and the mechanism of mechanochemical degradation were discussed.

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Effect of screw element type in degradation of polypropylene upon multiple extrusions

Cited by 39 publications

References 13 publications

A study of the controlled degradation of polypropylene containing pro-oxidant agents

A study of the controlled degradation of polypropylene containing pro-oxidant agents

Review on the thermo-oxidative degradation of polymers during processing and in service

A real‐time study on the evolution of the degradation of polypropylene during mixing process

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