The Porous Structure of Polymers and the Mechanism of Sorption

Tager, A.A.; Tsilipotkina, M.V.

doi:10.1070/rc1978v047n01abeh002205

Cited by 56 publications

(25 citation statements)

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“…12 The ideal crosslinked rubber behaves like a perfect Hookean spring. When it is under constant strain, the resulting stress remains constant as long as it is strained, and so it is time-independent.…”

Section: Phenomenology Of Stress Relaxation In Unfilled Rubbermentioning

confidence: 99%

Tensile stress relaxation of short‐coir‐fiber‐reinforced natural rubber composites

Geethamma¹,

Pothen²,

Rhao

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The stress relaxation behavior of natural rubber (NR) and its composites reinforced with short coir fibers under tension was analyzed. The rate of stress relaxation was a measure of the increase in the entropy of the compounds: the higher the rate was, the greater the entropy was. At lower strain levels, the relaxation mechanism of NR was independent of strain level. However, the rate of relaxation increased with the strain level. Also, the strain level influenced the rate of stress relaxation considerably in the coirreinforced NR composites. However, the relaxation mechanisms of both the unfilled compound and the composite were influenced by the strain rate. The rate of relaxation was influenced by fiber loading and fiber orientation. From the rate of stress relaxation, we found that fiber-rubber adhesion was best in the composite containing fibers subjected to a chemical treatment with alkali, toluene diisocyanate, and NR solutions along with a hexaresorcinol system as a bonding agent. In this study, the stress relaxation curves could not be viewed as segments with varying slopes; however, a multitude of inflection points were observed on the curves. Hence, we propose neither a two-step nor three-step mechanism for the coir-fiber-reinforced NR composites as reported for some other systems.

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Section: Phenomenology Of Stress Relaxation In Unfilled Rubbermentioning

confidence: 99%

Tensile stress relaxation of short‐coir‐fiber‐reinforced natural rubber composites

Geethamma¹,

Pothen²,

Rhao

et al. 2004

J of Applied Polymer Sci

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“…At low temperatures, most plastics become hard and brittle, whereas at high temperatures, they are rubbery or leathery and have great flexibility and toughness. 17,18 From the spectral dispersion curves [n()] of the PP fibers, we can read out n for any wavelength at any elevated temperature.…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature on the dispersion properties of polypropylene fibers

Belal

Hamza

Sokkar

et al. 2005

J of Applied Polymer Sci

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A Biolar PI polarizing interference microscope (a Pluta microscope) attached to a special hot stage was used to study the influence of temperature on the dispersion properties of polypropylene fibers with different deniers (6 D and 90 mm, 6 D and 150 mm, and 12 D and 150 mm) over the temperature range of 30 -50°C. This study was carried out with a variable-wavelength interferometry technique. Constant A of Cauchy's dispersion formula and the oscillation and dispersion energies for light vibrating parallel and perpendicularly to the fiber axis were determined at different temperatures. Microinterferograms are given for illustration.

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“…Structure of solutions differs substantially for the examined polymers due to their different chemical nature [15]: macromolecules of the flexible chain polymer PB have a shape of flexible Gaussian coils [12]; macromolecules of the stiff chain polymer CTA have a shape of sticks [18]. Polymer structure in solution is changed substantially with the increase of polymer concentration.…”

Section: Methodsmentioning

confidence: 99%