Preparation and dynamic properties of an anisotropic natural rubber film as viewed by electron spin resonance-spin probe method

Natural rubber (NR) films with the thickness of about 1 mm were prepared by removing the liquid phase from NR latex, which was previously irradiated. The primary radiation dose varied from 0 kGy (for unirradiated NR) to 200 kGy. Dry NR films were uniaxially stretched, and the degree of deformation,...

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Veröffentlicht in:Polymer engineering and science 2013-11, Vol.53 (11), p.2284-2291
Hauptverfasser: Valić, Srećko, Bonato, Jasminka, Andreis, Mladen, Klepac, Damir, Didović, Mirna Petković
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container_end_page 2291
container_issue 11
container_start_page 2284
container_title Polymer engineering and science
container_volume 53
creator Valić, Srećko
Bonato, Jasminka
Andreis, Mladen
Klepac, Damir
Didović, Mirna Petković
description Natural rubber (NR) films with the thickness of about 1 mm were prepared by removing the liquid phase from NR latex, which was previously irradiated. The primary radiation dose varied from 0 kGy (for unirradiated NR) to 200 kGy. Dry NR films were uniaxially stretched, and the degree of deformation, defined as λ = l/l0 (l0 and l being the lengths of relaxed and uniaxially deformed sample, respectively), was varied from λ = 1.0 (relaxed state) to λ = 2.7. Samples were then irradiated with secondary dose, which was chosen to be 100 or 200 kGy. NR films were characterized by differential scanning calorimetry and electron spin resonance–spin probe method. In addition, samples were exposed to accelerated thermal aging, and changes in molecular dynamics and structure were obtained. It has been shown that the application of deformation during the cross‐linking leads to the restriction in segmental mobility for the lower secondary dose, whereas for the higher secondary dose, larger values of λ induce an opposite effect originating from the structural changes. Thermally aged samples show higher amount of the gel phase and consequently higher fraction of slow motional chain segments. POLYM. ENG. SCI., 53:2284–2291, 2013. © 2013 Society of Plastics Engineers
doi_str_mv 10.1002/pen.23534
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The primary radiation dose varied from 0 kGy (for unirradiated NR) to 200 kGy. Dry NR films were uniaxially stretched, and the degree of deformation, defined as λ = l/l0 (l0 and l being the lengths of relaxed and uniaxially deformed sample, respectively), was varied from λ = 1.0 (relaxed state) to λ = 2.7. Samples were then irradiated with secondary dose, which was chosen to be 100 or 200 kGy. NR films were characterized by differential scanning calorimetry and electron spin resonance–spin probe method. In addition, samples were exposed to accelerated thermal aging, and changes in molecular dynamics and structure were obtained. It has been shown that the application of deformation during the cross‐linking leads to the restriction in segmental mobility for the lower secondary dose, whereas for the higher secondary dose, larger values of λ induce an opposite effect originating from the structural changes. Thermally aged samples show higher amount of the gel phase and consequently higher fraction of slow motional chain segments. POLYM. ENG. 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subjects Anisotropy
Applied sciences
Chemical processes
Crosslinking
Deformation
Differential scanning calorimetry
Electron spin
Exact sciences and technology
Irradiation
Mobility
Molecular dynamics
Molecular structure
Natural polymers
Natural rubber
Physicochemistry of polymers
Radiation
Rubber
title Preparation and dynamic properties of an anisotropic natural rubber film as viewed by electron spin resonance-spin probe method
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