On the sensitivity of dimensional stability of high density polyethylene on heating rate

Zehtabeyazdi, A.; Zebarjad, Seyed Mojtaba; Sajjadi, Seyed Abdolkarim; Esfahani, Javad Abolfazli

doi:10.3144/expresspolymlett.2007.16

Cited by 8 publications

(4 citation statements)

References 19 publications

(18 reference statements)

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“…Figure 4 illustrates the variation of change in length of C104 samples versus temperature as a function of heating rate. The reason for the dependency of dimensional stability of HDPE and its nanocomposite on heating rate can be referred to the fact that heating of whole of the samples needs a specific time, and by increasing heating rate, the surface of sample does not have enough time to transfer heat from one point to another [33,34].…”

Section: Resultsmentioning

confidence: 99%

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites

Sahebian

Zebarjad

Sajjadi

2010

Journal of Thermoplastic Composite Materials

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Dimensional stability is normally defined as the ability of a material to maintain its size and shape under various temperatures and stresses. The parameter, which is used to determine dimensional stability, is thermal expansion coefficient. This work deals with the study of the dimensional stability and thermal stability of high-density polyethylene (HDPE) and its nanocomposites by the presence of different stearic acid (SA) content as a modifier of surface. To investigate the role of surfactant on dimensional stability of HDPE nanocomposite reinforced with nano-sized calcium carbonate (CaCO3), nano-sized calcium carbonates were coated with different SA content. Standard specimens of HDPE/10 vol% CaCO3 nanocomposite were performed using injection method. To study dimensional stability of HDPE/10 vol% nanocomposites, dilatometry method was used. The results showed that addition of nano-sized CaCO 3 caused the decrease of thermal expansion coefficient of HDPE. In addition, dimensional stability of HDPE/10 vol% CaCO3 improved due to increasing SA content. Also, addition of inorganic fillers and surfactant retarded the thermal oxidation of HDPE.

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Section: Resultsmentioning

confidence: 99%

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites

Sahebian

Zebarjad

Sajjadi

2010

Journal of Thermoplastic Composite Materials

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“…Depending on the heating method employed, there are about ten or more suitable methods for the welding of HDPE [6]. HDPE is known to be the best material for buried installations due to its low cost, high chemical resistance, and moderate strength properties [8]. HDPE pipes similar to optical fiber microducts are extensively used in water and gas applications worldwide [2].…”

Section: A Hdpe Plastic and Electrofusion Weldingmentioning

confidence: 99%

Design and Development of a Battery Powered Electrofusion Welding System for Optical Fiber Microducts

et al. 2020

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At present, optical fiber microducts are coupled together by mechanical types of joints. Mechanical joints are thick, require a large space, and reduce the installation distance in multi-microduct installation. They may leak or explode in the blown fiber installation process. Mechanical joints are subjected to time dependent deterioration under long service times beneath the earth's surface. It may start with a small leakage, followed by damage due to water freezing inside the optical fiber microduct. Optical fiber microducts are made up of high-density polyethylene, which is considered most suitable for thermoelectric welding. For thermoelectric welding of two optical fiber microducts, the welding time should be one second, and should not cause any damage to the inner structure of the microducts that are being coupled. To fulfill these requirements, an LTspice simulation model for the welding system was developed and validated. The developed LTspice model has two parts. The first part models the power input to joule heating wire and the second part models the heat propagation inside the different layers of the optical fiber microduct and surrounding joint by using electro-thermal analogy. In order to validate the simulation results, a battery powered prototype welding system was developed and tested. The prototype welding system consists of a custom-built electrofusion joint and a controller board. A 40 volt 4 ampere-hour Li-Ion battery was used to power the complete system. The power drawn from the battery was controlled by charging and discharging of a capacitor bank, which makes sure that the battery is not overloaded. After successful welding, a pull strength test and an air pressure leakage test were performed to ensure that the welded joints met the requirements set by the mechanical joints. The results show that this new kind of joint and welding system can effectively replace mechanical joints in future optical fiber duct installations.

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“…High‐density polyethylene (HDPE) is among the most widely used commodity polymers with high tonnage production because of its moderate strength, excellent processability and high chemical resistance . However, its application in many industries has been limited because of its weak environmental resistance and dimensional stability and also higher production costs.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of volcanic particle and calcium carbonate filler materials in HDPE for thermal and mechanical properties

2018

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Usage potential of volcanic particles (VPs) in high‐density polyethylene (HDPE) composites against traditional calcium carbonate (CaCO3) was investigated for thermal and mechanical properties. HDPE composites were prepared by melt compounding and injection molding processes with various filler contents such as 6, 12, 18, and 24 wt%. Thermal properties such as melting behavior and thermal expansion behavior were analyzed by differential scanning calorimeter and dilatometry machine; respectively. In addition, mechanical properties such as tensile modulus, tensile strength and elongation at break parameters were investigated with tensile tests. After the experimental results it was shown that the use of VPs had a much larger effect in improving mechanical properties and in reducing coefficient of thermal expansion values of HDPE composites, compared with the use of CaCO3 particles. It was determined that maximum levels of thermal properties which were obtained with higher contents of CaCO3 were sufficiently achieved with lower contents of VPs such as 6 wt%. POLYM. COMPOS., 39:E1900–E1907, 2018. © 2018 Society of Plastics Engineers

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On the sensitivity of dimensional stability of high density polyethylene on heating rate

Cited by 8 publications

References 19 publications

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites

Design and Development of a Battery Powered Electrofusion Welding System for Optical Fiber Microducts

Comparative study of volcanic particle and calcium carbonate filler materials in HDPE for thermal and mechanical properties

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On the sensitivity of dimensional stability of high density polyethylene on heating rate

Cited by 8 publications

References 19 publications

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO3 Nanocomposites

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO3 Nanocomposites

Design and Development of a Battery Powered Electrofusion Welding System for Optical Fiber Microducts

Comparative study of volcanic particle and calcium carbonate filler materials in HDPE for thermal and mechanical properties

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Product

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Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites

Role of Surface Active Agent on Dimensional Stability of HDPE/CaCO₃ Nanocomposites