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

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Title:Thermomechanical Properties of Radiation-Modified Polyethylene/Ethylene-Propylene-Diene Copolymer/Liquid-Crystalline Copolyester Blends
Creators:
Revjakin, Oleg
Zicans, Janis
Kalnins, Martins
Kalkis, Valdis
Maksimov, Robert D.
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 64, 7, pp. 1180-1192
Uncontrolled Keywords:Copolymers, Setting stresses, Thermorelaxation stresses, Radiation-modified blends, Poly(ethylene-<i>co</i>-propylene-<i>co</i>-dicyclopentadiene), Elastic modulus, Polyethylene, Poly[ethylene terephthalate-<i>co</i>-(4-hydroxybenzoic acid)]

Abstract

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 <sup>60</sup>Co 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. <p>

Title:Thermomechanical Properties of Radiation-Modified Polyethylene/Ethylene-Propylene-Diene Copolymer/Liquid-Crystalline Copolyester Blends
Creators:
Revjakin, Oleg
Zicans, Janis
Kalnins, Martins
Kalkis, Valdis
Maksimov, Robert D.
Uncontrolled Keywords:Copolymers, Setting stresses, Thermorelaxation stresses, Radiation-modified blends, Poly(ethylene-<i>co</i>-propylene-<i>co</i>-dicyclopentadiene), Elastic modulus, Polyethylene, Poly[ethylene terephthalate-<i>co</i>-(4-hydroxybenzoic acid)]
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:64
Number:7
Page Range:pp. 1180-1192
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19991180UNSPECIFIED
ID Code:1549
Item Type:Article
Deposited On:06 Feb 2009 17:10
Last Modified:06 Feb 2009 16:10

Citation

Revjakin, Oleg; Zicans, Janis; Kalnins, Martins; Kalkis, Valdis; Maksimov, Robert D. (1999) Thermomechanical Properties of Radiation-Modified Polyethylene/Ethylene-Propylene-Diene Copolymer/Liquid-Crystalline Copolyester Blends. Collection of Czechoslovak Chemical Communications, 64 (7). pp. 1180-1192. ISSN 0010-0765

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