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Key Words electrofusion, polymer pipe, molecular diffusion, joint, strength Polymerization Quarte... more Key Words electrofusion, polymer pipe, molecular diffusion, joint, strength Polymerization Quarterly, 2018 Volume 7, Number 4 Pages 83-93 E lectrofusion is among several techniques to join polymer pipes using special fittings. In electrofusion, polymer pipes and fittings are joined together through wires that are installed in their structures. The main difference between the two techniques of common heat fusion and electrofusion is in heat transfer mechanism. In heat fusion, a heating device is used to melt interfaces of the pipes and polymer fitting. In electrofusion, there is internal melting through a conductive substance inside the weld interface or melting by a conductive polymer. The heat is produced through electric current contacting conductive materials installed inside the fittings. In order to have desirable materials and useful products, design and installation is based on proper joints having passed good welding testing conditions. Methods of welding and joining are dif...
International Journal of Plastics Technology, 2018
Oxidation induction time test is as an accelerated procedure and a qualitative evaluation perform... more Oxidation induction time test is as an accelerated procedure and a qualitative evaluation performing to measure, thermal stability of polyolefins with using of Differential Scanning Calorimetry method. This can be interpreted as an indicator of the thermal stability of polyolefins, used in an oxidation environment. The results of test depend on various factors. Despite the widespread use of it in many different bases, studies about these factors and their impacts have not been significant. In ahead study, these factors were in two main groups, Ι-Sample conditions includes amount of the sample, the place of sample, sample geometry and ΙΙ-Test and instrument conditions includes heating rate, type of crucible, Oxygen gas flow rate, isothermal temperature and instrument temperature stabilization time. By choosing a High Density Polyethylene sample and conducted tests with preparation, together with statistical analysis by Yates algorithm and application of Minitab along with Design Expert software's, the impact of above factors were investigated. Among the factors related to the conditions of the test sample, specimen geometry and location of its choice and among the ones related to test conditions, heating rate, isothermal temperature and instrument temperature stabilization time were identified important and with significant impacts.
Key Words electrofusion, polymer pipe, molecular diffusion, joint, strength Polymerization Quarte... more Key Words electrofusion, polymer pipe, molecular diffusion, joint, strength Polymerization Quarterly, 2018 Volume 7, Number 4 Pages 83-93 E lectrofusion is among several techniques to join polymer pipes using special fittings. In electrofusion, polymer pipes and fittings are joined together through wires that are installed in their structures. The main difference between the two techniques of common heat fusion and electrofusion is in heat transfer mechanism. In heat fusion, a heating device is used to melt interfaces of the pipes and polymer fitting. In electrofusion, there is internal melting through a conductive substance inside the weld interface or melting by a conductive polymer. The heat is produced through electric current contacting conductive materials installed inside the fittings. In order to have desirable materials and useful products, design and installation is based on proper joints having passed good welding testing conditions. Methods of welding and joining are dif...
International Journal of Plastics Technology, 2018
Oxidation induction time test is as an accelerated procedure and a qualitative evaluation perform... more Oxidation induction time test is as an accelerated procedure and a qualitative evaluation performing to measure, thermal stability of polyolefins with using of Differential Scanning Calorimetry method. This can be interpreted as an indicator of the thermal stability of polyolefins, used in an oxidation environment. The results of test depend on various factors. Despite the widespread use of it in many different bases, studies about these factors and their impacts have not been significant. In ahead study, these factors were in two main groups, Ι-Sample conditions includes amount of the sample, the place of sample, sample geometry and ΙΙ-Test and instrument conditions includes heating rate, type of crucible, Oxygen gas flow rate, isothermal temperature and instrument temperature stabilization time. By choosing a High Density Polyethylene sample and conducted tests with preparation, together with statistical analysis by Yates algorithm and application of Minitab along with Design Expert software's, the impact of above factors were investigated. Among the factors related to the conditions of the test sample, specimen geometry and location of its choice and among the ones related to test conditions, heating rate, isothermal temperature and instrument temperature stabilization time were identified important and with significant impacts.