Polymers in the Oral Environments

Kalachandra, S.; Takamata, Tetsuya

doi:10.1007/978-1-59259-197-8_2

Cited by 1 publication

(1 citation statement)

References 52 publications

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“…D was calculated from the reduced sorption curve (Fig. 7), which is ( m t − m 0 )/( m infinity − m 0 ) versus ( t 1/2 /thickness), based on the following equation51, 52: The D that is supposedly measured by the experiment results from the diffusion down the concentration gradient formed inside the solid after the liquid has adsorbed and then dissolved into the surface layer of the specimen. D for PEG was 40 times larger than D for N9 ( D was 1.5 × 10 −9 and 0.038 × 10 −9 cm 2 /s for PEG and N9, respectively) because of the greater size of N9 compared to PEG.…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties of polyurethane film exposed to solutions of nonoxynol‐9 surfactant and poly(ethylene glycol)

McDermott

Schroeder

Balsis

et al. 2003

J of Applied Polymer Sci

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Mechanical properties of two polyether urethane films (Estane and Tecoflex) were studied after exposure to solutions of nonoxynol 9 (N9) surfactant and poly-(ethylene glycol) 400 (PEG) for various times. Large amounts of N9 were absorbed from N9/PEG solutions, resulting in soft-segment plasticization and lower mechanical properties. As the N9 concentration increased, Estane absorbed more liquid and its mechanical properties decreased more compared to Tecoflex, although the mechanical properties of Estane were higher than Tecoflex at low concentrations of N9. Hard-segment domain disruption is probably not occurring because the relationship between the elastic modulus and polymer volume fraction followed Flory's theory for swollen elastic rubber networks and the liquids do not fully dissolve the polymers. The diffusion behavior of N9 and PEG was observed to follow Fickian behavior. Most of the absorption and decrease in mechanical properties occurred within the first 20 h after soaking, implying that additional loss in strength over longer times would be minimal. Mechanical property anisotropy suggests that condoms should be cut from Estane film in an orientation that optimizes the property-orientation relationship for specific end uses.

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