Generalization of the Temperature Dependence of Some Physical Properties of High-strength Polyethylene (HDPE) Using the Method of Given Parameters
Issue:
Volume 7, Issue 6, December 2019
Pages:
130-134
Received:
15 July 2019
Accepted:
19 August 2019
Published:
11 December 2019
Abstract: In this paper, based on the study of HDPE by dilatometric and rheological methods in a wide range of temperatures and cooling and deformation rates, we generalized the temperature dependence of the physical properties of polyethylene using the specified parameters method. Test specimens (cylinder size: height 12 mm, diameter 9.3 mm) were obtained both in the dilatometer’s test cylinder itself and in a specially designed injection mold using injection molding on a TP-125 injection molding machineThe temperatures in the experiments were added and maintained with an accuracy of 3.2.°C. Defined by The dependence of ρ_0 T_0 / ρT (relative reduced density of the polymer) on the reduced temperature (T - T0). Test specimens (cylinder size: height 12 mm, diameter 9.3 mm) were obtained both in the dilatometer’s test cylinder itself and in a specially designed injection mold using injection molding on a TP-125 injection molding machine. It was found that a reliable characteristic of the dilatometric properties of the crystallizing polymer, physically correctly and completely reflecting the features of the crystalline structure, can be obtained only in the mode of stepwise temperature changes, when at each given temperature the equilibrium value of the specific sample of the primer is fixedThus, the practical value of the dilatometric method for studying crystallizing polymers is shown, especially when comparing the results of dilatometry with the results of rheological studies.
Abstract: In this paper, based on the study of HDPE by dilatometric and rheological methods in a wide range of temperatures and cooling and deformation rates, we generalized the temperature dependence of the physical properties of polyethylene using the specified parameters method. Test specimens (cylinder size: height 12 mm, diameter 9.3 mm) were obtained b...
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Experimental Study of Destructive Distillation of Maiganga Coal: Analysis of Products’ Yield and Composition
Habu Iyodo Mohammed,
Ali Lawan Yaumi,
Alhaji Shehu Grema,
Murtala Musa Ahmed,
Abubakar M ohammed El-Jummah
Issue:
Volume 7, Issue 6, December 2019
Pages:
135-140
Received:
26 January 2020
Accepted:
10 February 2020
Published:
14 February 2020
Abstract: The research involves destructive distillation of Maiganga coal, analysis of the yields and characterization of condensable products. Maiganga coal was distillated in a pyrolyser, the condensable products were recovered in a three stage separator, and the products were collected over a range of temperatures. The yields’ of the char was obtained by measuring the weight of the char and then divided by the starting weight of the coal sample. The condensable products yields were obtained in similar manner as the char. The yield of the gaseous product was obtained by subtracting the sum of yields of char and condensable products from unity. The yields of semi-coke, water and tar were 63, 11, and 7%, respectively. The tar obtained was characterize using GC/MS to determine the chemical composition. The characterization was carried out using Agilent Gas Chromatography/ Mass Selective Detector (GC/MSD). The GC/MSD results show that the dominant compounds in the tar are aromatic, acid, and esters. However sulphur, nitrogen, chlorine, and fluorine compounds were present. The specific dominant compound is Benzeneacetic acid, 4-tetradecyl ester, (C22H36O2) about 33%, and the least were 1H-Thiopine, 2,3,6,7-tetrahydro-4,5-didehydro-3,3,6,6-tetramethyl (C10H16OS), 1-oxide, 4-(2,5-Dihydro-3-methoxyphenyl)butylamine (C11H19NO) about 6%. The coal may serve as feedstock for production of coke and aromatic compounds.
Abstract: The research involves destructive distillation of Maiganga coal, analysis of the yields and characterization of condensable products. Maiganga coal was distillated in a pyrolyser, the condensable products were recovered in a three stage separator, and the products were collected over a range of temperatures. The yields’ of the char was obtained by ...
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