Effects of surface morphology on space charge formation in low density polyethylene

Zheng, Changji; Guan, Bo Shi; Zhao, Hong; Yang, Jiaming; Zhi, Sun

doi:10.1109/tdei.2015.005076

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…The analysis of charge density measurement for composites were done based on the published results by the researchers [3,6,7,11]. Figure 6 shows the charge density results where red, green and blue, and orange line represents cross-linked polyethylene (XLPE), low density polyethylene (LLDPE) and polypropylene (PP) with different specimen thickness respectively.…”

Section: Charge Density Resultsmentioning

confidence: 99%

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Review of space charge measurement by pulsed electro-acoustic technique

Kandar

Jamail

Othman

et al. 2020

IJEECS

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<p>Pulsed electro-acoustic (PEA) is well known as a non-destructive technique for testing and describing space charge profiles in the insulation. Degradation due to moisture, ageing, external flashover, partial discharge and space charge are considered as insulation defects that is an issue in high voltage insulator. Space charge may distort the internal electric field that may lead to an electrical breakdown. For instance, a method based on an acoustic phenomenon can be used to describe the space charge profiles. This paper compares several earlier researches on different specimen of PEA method and reviews their results to find the space charge distribution profiles. The scope of the review includes types of methods used. The acoustic technique is considered for this study. It has been observed that the PEA technique successfully gives the same result as theoretical that is based on the obtained profile. Linear low-density polyethylene (LLDPE) composite demonstrates about 89 % lower charge density value compared to cross-linked polyethylene (XLPE) and polypropylene (PP) composite. While the electric field value of ethylene-vinyl acetate (EVA) sample is 75 % lower than low-density polyethylene (LDPE) sample. This study found that the time interval, specimen thickness and the electric field sway the space charge profiles. </p>

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Section: Charge Density Resultsmentioning

confidence: 99%

“…Space charge distribution of composite at different electric fields of 40kV/mm, 50kV/mm and 100kV/mm[3,6,7,11] …”

mentioning

confidence: 99%

Review of space charge measurement by pulsed electro-acoustic technique

Kandar

Jamail

Othman

et al. 2020

IJEECS

View full text Add to dashboard Cite

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“…Based on the complex structural hierarchy, there are three different types of PE, named low-density PE (LDPE), high-density PE (HDPE), and linear low-density PE (LLDPE), with all of these polymers differing in molecular weight distribution and chain branching [ 2 , 3 ]. LDPE is employed in the manufacturing of bottles, films, wire insulators, and molded parts [ 4 , 5 , 6 , 7 ]. In the academic field, it is used as a model polymer for the understanding of the relation between the structure and properties [ 1 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Although LDPE exhibits a spherulitic supramolecular structure in the bulk of thick specimens (>200 nm) such as those injected molded, other morphologies may be obtained by varying the film thickness in confined systems [ 10 , 11 , 12 ]. Because of its semicrystalline nature, the microstructure presents ordered regions of polymer chains known as spherulites, which are conformed of fold back chains or lamellae growing out from nucleation points, interconnected by disordered polymer chains or amorphous regions [ 6 ]. The ratio of the crystalline to amorphous regions influences the different physical properties, such as mechanical, thermal, surface, and hardness [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, several works have qualitatively related this ratio with the final measured properties [ 10 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Zheng et al [ 6 ] employed X-ray diffraction (XRD) to calculate the intensities ratio of the amorphous halo to the most intense diffraction peak of LDPE hot-pressed at different conditions. They found different results when comparing the calculated ratios against the full-width half-maximum (FWHM) values.…”

Section: Introductionmentioning

confidence: 99%

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Injection Molding of Low-Density Polyethylene (LDPE) as a Model Polymer: Effect of Molding Parameters on the Microstructure and Crystallinity

et al. 2021

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Due to its relatively simple structure, low-density polyethylene (LDPE) can be considered as a model polymer for the study of its properties. Herein, the effect of processing variables on the microstructure and crystallinity of injection-molded LDPE specimens was quantitatively determined. The polymer was injected at different temperature conditions in the barrel and the mold. The specimens were characterized by scanning electron microscopy and X-ray diffraction. With the data obtained, an analysis of variance (ANOVA) was carried out, and response surface graphs (SRP) were constructed to quantify and to observe the behavior of the processing variables, respectively. Different models were obtained to predict the effect of the experimental factors on the response variables. The results showed that the interaction of the two temperatures has the greatest effect on the size of the spherulite, while the temperature of the mold affects the crystallinity. The SRP showed different behaviors: for the spherulite, the size increases with the mold temperature, while for the crystallinity, higher values were observed at an intermediate mold temperature and a low melt temperature. The results presented herein are valuable for setting empirical relations between the microstructure, crystallinity, and the molding conditions of LDPE.

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