Free-volume microprobe study of iodine diffusion in polymers

Ramani, R.; Ranganathaiah, C.

doi:10.1002/1097-0126(200102)50:2<237::aid-pi613>3.0.co;2-q

Cited by 55 publications

(48 citation statements)

References 53 publications

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“…Ramani et al [322] and Ramani and Ranganathaiah [323] investigated the iodine sorption by ABS resin, employing positron annihilation lifetime spectroscopy (PALS). Iodine sorption was performed by soaking the sample in an aqueous I 2 /KI solution for different time inter vals at room temperature.…”

Section: Butadienic Copolymersmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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Section: Butadienic Copolymersmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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“…(8)) [25] has been used to calculate the change in D value for Fickian [33] and non-Fickian sorption [25]. These results suggest that the value of D calculated from the late-time approximation is usually less than that calculated from the early-time approximation (Eq.…”

Section: Free Volume and Diffusion Coefficientmentioning

confidence: 97%

“…The inverse of the slope gives t R, which equals (13840 AE 1300) min for the present case. This value is of the same order but not equal as in the case of iodine sorption in ABS and PET[25] because, this parameter value depends on both the nature of the penetrant and the structure of the polymer matrix. The dashed curve in theFig.…”

mentioning

confidence: 89%

Water Sorption Studies in a RGP Contact Lens Polymer Paraperm by Positron Lifetime Technique

Thimmegowda

Paladugu

Shariff

et al. 2002

phys. stat. sol. (a)

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“…The effects produced by exposure to UV radiation depend on the rubber formulation [7][8][9][10][11], among other factors. It has been proved [12] that fillers and additives in rubber formulations can improve their mechanical and rheological properties.…”

Section: Introductionmentioning

confidence: 99%

“…Although the effects of fillers on the mechanical and rheological properties of rubbers have been studied extensively [10,11,[16][17][18], to our knowledge, their influence on adhesion and surface properties has scarcely been considered. It has been established that the nature and extent of the surface modifications produced on filled rubbers by surface treatment depends on the nature of the filler, its particle size and shape, concentration, distribution and orientation in the polymer [1,7,19,20].…”

Section: Introductionmentioning

confidence: 99%