Role of Divalent Metals in Polymer Degradation

Rahman, Md. Wasikur; Alam, Jahangir; Hossain, Muhammad Mohsin; Dafader, N. C.; Haque, M. E.

doi:10.1080/1023666x.2014.850908

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…[1] Further improvement has been achieved by lowering required radiation doses through the invention of sensitizers. [12,13] Lately, the effect of TiO 2 and creaming agents on vulcanization has been reported. [5,6] Not many reports can be found in the literature on how to enhance the degree of vulcanization of NR by using additives other than sensitizers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Manganese on Radiation Vulcanization of Natural Rubber

Rahman

Alam

Khan

2015

International Journal of Polymer Analysis and Characterization

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Manganese was added as a promoter to investigate physico-mechanical properties of radiationvulcanized natural rubber latex (RVNRL) films. RVNRL films were prepared by the addition of Mn with the concentration range 0-30 ppm to natural rubber latex and irradiated with various radiation doses (0-20 kGy). Tensile strength, tear strength, and cross-linking density of the irradiated rubber films increased with increasing the concentration of Mn ions as well as radiation doses. In contrast, elongation at break, permanent set, and swelling ratio of the films were decreased under the same conditions. The concentration of Mn ions and radiation doses were optimized and found to be 20 ppm and 12 kGy, respectively. The maximum tensile and tear strengths of irradiated rubber films were observed as 29.12 MPa and 44.78 N/mm, respectively at the optimum conditions. The mechanical properties of the films increased markedly with the addition of Mn until they attained the highest values of 33.88 MPa and 54.77 N/mm, respectively. These enhancements, which reached approximately 20% at the most favorable conditions, can be explained by the effect of transition metals in view of Fajan's rules regarding the covalent character of ionic bonds and suggest that the higher the difference in charges between cation and anion, the higher the ability to form distortion or polarization of ions.

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Section: Introductionmentioning

confidence: 99%

Effect of Manganese on Radiation Vulcanization of Natural Rubber

Rahman

Alam

Khan

2015

International Journal of Polymer Analysis and Characterization

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“…[27,28] The permanent set of gelatin films obtained with HEMA of various concentrations as well as with different radiation doses is shown in Figure 3. Therefore, 1 kGy radiation dose and 20 ppm HEMA might be considered the optimum values for GHEMA films.…”

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confidence: 99%

Gamma-Irradiated Gelatin-Based Films Modified by HEMA for Medical Application

Alam

Rahman

Mazid

et al. 2015

International Journal of Polymer Analysis and Characterization

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The present article describes the synthesis and characterization of bi-component polymer systems based on gelatin films incorporated with 2-hydroxyethyl methacrylate (HEMA) monomer, developed for medical application. Gelatin films were prepared by the addition of HEMA of different concentrations (0-30 wt.%) and irradiated with various radiation doses (0-5 kGy). Tensile strength and tear strength of the irradiated gelatin films were found to increase with increasing HEMA up to 20 wt.% as well as radiation doses (1 kGy) as optimized. The maximum tensile and tear strengths of irradiated gelatin films with HEMA were found to be 79.1 MPa and 83.2 N/mm, respectively, at the optimum conditions, and these values were about double that of a reference film prepared without additives. In addition, morphological analysis was done by scanning electron microscopy (SEM) and showed how HEMA cemented and was covered with gelatin in the blend. Thermomechanical analysis was carried out to investigate the shifting of glass transition temperature (T g ) towards higher temperature due to HEMA addition, and the effect of this film was tested on the human body in order to determine whether it can be applied for medical purposes.

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