Influence of Low-Molecular-Weight Organic Compounds on Thermal Effects in Their Mixtures with Low-Density Polyethylene after High-Pressure Plastic Deformation

• Published in: High energy chemistry Vol. 55; no. 3; pp. 249 - 254
• Main Authors: Zhorin, V. A., Kiselev, M. R.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.05.2021; Springer Nature B.V
• Subjects: Acids; Anthracene; Aspartic acid; Chemistry; Chemistry and Materials Science; Crystallites; Crystallization; Cyanuric acid; Deformation effects; Density; Dyes; Enthalpy; Fumaric acid; High Pressure Chemistry; Indigo; Low density polyethylenes; Melamine; Organic compounds; Physical Chemistry; Plastic deformation; Polyethylene; Polymers; Recrystallization; Succinic acid; Temperature effects; Weight; low-density polyethylene; polymer–monomer mixtures; thermal effects; high pressure; plastic deformation
• ISSN: 0018-1439; 1608-3148
• DOI: 10.1134/S0018143921020120

Mixtures of low-density polyethylene ( T m = 108°C; enthalpy of melting, 80 J g −1 ) with various low-molecular-weight organic components have been subjected to plastic deformation under a pressure of 1 GPa on an anvil-type high-pressure device. Melamine, cyanuric acid, adamantane, tetracene, fumaric acid, succinic acid, aspartic acid, indigo, anthracene, methyl orange, congo red, and safranin have been used as a low-molecular-weight component. The deformed mixtures have been studied using the DSC method. The thermograms of the mixtures at temperatures below the polymer T m exhibited both endothermic and exothermic peaks. The endotherms and exotherms have been associated with the melting of small polymer crystallites and the crystallization or recrystallization processes in the polymer phase, respectively. In some mixtures, thermal effects were detected at temperatures above the polymer T m , 117–161°C. These effects have been attributed to electrostatic interaction at the polymer/low-molecular-weight component interfaces.