Effect of chain structure on the processing stability of high-density polyethylene

Pock, Eszter; Kiss, Cs.; Janecska, Ákos; Epacher, Edina; Pukánszky, Béla

doi:10.1016/j.polymdegradstab.2003.05.005

Cited by 21 publications

(11 citation statements)

References 23 publications

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“…A typical representative of commodity polymers is high-density polyethylene (HDPE), which excels with its good wear resistance, high fracture toughness, chemical stability, corrosion resistance, light weight, etc. [1][2][3][4]. The biggest disadvantage of HDPE is its relatively low temperature stability, which makes it impossible to apply this material where there may be a risk of the temperature rising above the tolerable limit.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature Ageing on Injection Molded High-Density Polyethylene Parts Modified by Accelerated Electrons

2022

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The temperature ageing of high-density polyethylene (HDPE) modified by accelerated electrons was studied. Commodity plastic HDPE was used as a basic polymer material which was modified by radiation cross-linking. This polymer was used because of its excellent processability and chemical resistance. Plastic injection molding technology was used for the production of test specimens. These specimens were modified with the dose of radiation 33, 66, 99, 132, 165, and 198 kGy. The prepared specimens were tested to determine: gel content, degree of swelling, temperature stability, and changes in mechanical properties after temperature ageing. The results were determined by scanning electron microscopy (SEM) analysis on the fracture surfaces. The results of this study confirm that modification of HDPE by radiation cross-linking has a significant effect on increasing temperature stability. It has been shown that HDPE modified by radiation cross-linking can withstand temperatures exceeding the melting point of the original HDPE for a short-term.

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Section: Introductionmentioning

confidence: 99%

Effect of Temperature Ageing on Injection Molded High-Density Polyethylene Parts Modified by Accelerated Electrons

2022

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“…The effect of thermooxidative degradation might cause a complicated situation in the mixing process of PP. It is considered that both the thermooxidative degradation and mechanochemical degradation might appear simultaneously during the mixing process of PP 10, 13, 14, 16–19, 24, 33–35…”

Section: Introductionmentioning

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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“…Degradation of polymers has received much scientific and industrial interest because of its importance in polymer processing1–5 and research purposes 6–8. Although many studies have been conducted to investigate the degradation of individual polymers9–18 and also the modeling of degradation processes,15–17 only few research activities have been done to analyze the thermal decomposition of polymer blends 19–22.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the thermal decomposition behavior and kinetic analysis of PTT/phenoxy blends

Farmahini-Farahani

Jafari

Khonakdar

et al. 2008

J of Applied Polymer Sci

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Thermal decomposition of binary blends composed of poly(trimethylene terephthalate) (PTT) and a phenoxy resin, namely poly(hydroxy ether) of bisphenol A, and prepared by melt blending was studied using thermogravimetric analysis. The thermal decomposition behavior of the blends could be explained in terms of formation and loss of hydrogen bonds and appearance of both low and high molecular weight species due to transesterification reaction between hydroxyl groups of phenoxy with ester bonds of PTT. The kinetics of decomposition reaction was analyzed by Freeman-Carroll, Friedman, Chang, and Vachuska-Voboril methods. It was found that all of the methods well described the decomposition reaction of the blends. The correlation between the calculated values and the chemical nature of the blends was acceptable. Among all the investigated methods the Chang method showed the best correlation with the experimental data. FTIR spectroscopy was employed to study the chemical structure of the blends. The results revealed strong interaction between the blend components in the form of hydrogen bonding. Progress of these interactions was followed with time and temperature. The effects of blending and loss of hydrogen bonding on degradation behavior in this kind of reactive blends were emphasized.

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Effect of chain structure on the processing stability of high-density polyethylene

Cited by 21 publications

References 23 publications

Effect of Temperature Ageing on Injection Molded High-Density Polyethylene Parts Modified by Accelerated Electrons

Effect of Temperature Ageing on Injection Molded High-Density Polyethylene Parts Modified by Accelerated Electrons

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

Investigation of the thermal decomposition behavior and kinetic analysis of PTT/phenoxy blends

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