Features of thermomechanical properties of radiation-modified blends of high-density polyethylene with liquid-crystalline copolyester

1998 ◽  
Vol 34 (1) ◽  
pp. 94-105 ◽  
Author(s):  
V. Kalkis ◽  
M. Kalninš ◽  
R. D. Maksimov ◽  
J. Zicans
Keyword(s):  
High Density Polyethylene ◽  
Liquid Crystalline ◽  
Thermomechanical Properties ◽  
High Density ◽  
Liquid Crystalline Copolyester

Fabrication and thermomechanical properties of carbonized Luffa cylindrica ‐reinforced high‐density polyethylene composites

2021 ◽  
pp. 52040
Author(s):  
Ioannis Ioannou ◽  
Paraskevas Kyriacou ◽  
Marios Pantelas ◽  
Ioannis Pashalidis ◽  
John Makris ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Thermomechanical Properties ◽  
High Density ◽  
Luffa Cylindrica ◽  
Polyethylene Composites

Thermomechanical properties of a magnetically and mechanically oriented liquid crystalline copolyester, xydar

1998 ◽  
Vol 38 (6) ◽  
pp. 914-921 ◽  
Author(s):  
Svetlana A. Kossikhina ◽  
Tsunehisa Kimura ◽  
Eiko Ito ◽  
Masanori Kawahara
Keyword(s):  
Liquid Crystalline ◽  
Thermomechanical Properties ◽  
Liquid Crystalline Copolyester

Thermomechanical Properties of Radiation-Modified Polyethylene/Ethylene-Propylene-Diene Copolymer/Liquid-Crystalline Copolyester Blends

1999 ◽  
Vol 64 (7) ◽  
pp. 1180-1192 ◽  
Author(s):  
Oleg Revjakin ◽  
Janis Zicans ◽  
Martins Kalnins ◽  
Valdis Kalkis ◽  
Robert D. Maksimov
Keyword(s):  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Thermomechanical Properties ◽  
Morphological Properties ◽  
Ethylene Propylene ◽  
Heating And Cooling ◽  
Thermomechanical Behaviour ◽  
Kinetics Of Formation ◽  
Liquid Crystalline Copolyester ◽  
Poly Ethylene

Radiation-modified blends of high-density polyethylene (PE) with ethylene-propylene-diene copolymer (EPDM; 10-65 wt.%) and thermotropic liquid-crystalline polymer (LCP; 10 wt.%) were investigated. The LCP was a liquid-crystalline copolyester of 40% poly(ethylene terephthalate) with 60% 4-hydroxybenzoic acid. The constituents were blended using a circular extruder, the specimens were prepared by compression molding and irradiated by 60Co γ-radiation up to 200 kGy. Mechanical, thermal, and morphological properties in wide temperature range were investigated for the irradiated and non-irradiated specimens. The effects of irradiation on the thermomechanical behaviour of the PE matrix are discussed. The LCP addition significantly affected the stress-strain behaviour of PE at temperatures above its melting point resulting in some anomalies in kinetics of formation of thermorelaxation stresses, which arise if the material is previously oriented. Thermosetting properties (thermorelaxation stresses and residual setting stresses under conditions of isometric heating and cooling) of the PE/EPDM/LCP blends crosslinked by irradiation and then oriented were also established. The results obtained suggest that such ternary blends improve the application properties of irradiated polyethylene and obtain useful thermosetting materials.

scholarly journals Coffee Silverskin as a Multifunctional Waste Filler for High-Density Polyethylene Green Composites

2021 ◽  
Vol 5 (2) ◽  
pp. 44
Author(s):  
Aleksander Hejna ◽  
Mateusz Barczewski ◽  
Paulina Kosmela ◽  
Olga Mysiukiewicz ◽  
Anton Kuzmin
Keyword(s):  
High Density Polyethylene ◽  
Natural Fiber ◽  
Interfacial Area ◽  
Thermomechanical Analysis ◽  
Thermomechanical Properties ◽  
High Density ◽  
Main Task ◽  
Oxidation Induction Time ◽  
Coffee Silverskin ◽  
Wood Polymer

This work aims to describe the coffee silverskin effect as a lignocellulosic waste filler for high-density polyethylene (HDPE) composites development. The main task was to determine various modification effects resulting from the complex chemical composition of coffee silverskin containing compounds with potential antioxidative properties, including caffeine, polyphenols, tannins, or melanoidins. The processing, thermal, physicochemical, and thermomechanical properties of the HDPE-based composites with different filler content (1–20 wt%) were evaluated. Comprehensively realized thermomechanical analysis revealed the filler’s reinforcing effects on the HDPE matrix while defining problems with obtaining adequate adhesion in the interfacial area. At the same time, studies have shown a very beneficial effect of the silverskin addition on the thermal properties of composites, that even the smallest addition allows for a significant increase in the thermooxidative resistance of HDPE composites assessed using the oxidation induction time from 20 min for HDPE up to 140 min for the composites with 20 wt% of the filler. The obtained research results allow classifying the coffee silverskin waste filler, not only as a filler intended for the production of composites with a high degree of filling but also as an additive that significantly changes the properties of polyethylene in the case of using low concentrations. This can have a very beneficial impact on the development of novel wood polymer (WPC) and natural fiber composites (NFC).

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