Aspects of the sorption-diffusion processes in segmented polyether urethanes

Razumovskii, L.P.; Iordanskii, A. L.; Zolotova, Ye.V.; Trezvova, A.V.; Fortunatov, O.G.; Zaikov, G.Ye.

doi:10.1016/0032-3950(91)90156-k

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The moisture sorption isotherms for SPUU-1 belong to the type IV sorption isotherm category (Figure 2), in the classification given in work [11], which is in line with data on moisture sorption by segmented polyurethanes with polypropylene oxide flexible segments obtained previously [12].…”

Section: Resultssupporting

confidence: 88%

Influence of Moisture Sorption on the Physical and Mechanical Properties of Plasticised Poly(Ether Urethane Ureas)

Tereshatov

Стрельников

Макарова

et al. 2011

International Polymer Science and Technology

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Section: Resultssupporting

confidence: 88%

Influence of Moisture Sorption on the Physical and Mechanical Properties of Plasticised Poly(Ether Urethane Ureas)

Tereshatov

Стрельников

Макарова

et al. 2011

International Polymer Science and Technology

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“…According to the classification given in Baer [4], the moisture sorption isotherms are sorption isotherms of type IV. A similar form of moisture sorption isotherm for SPUs and SPUUs with flexible polyether blocks was obtained in Tereshatov et al [1] and Razumovskii et al [5].…”

Section: Methodssupporting

confidence: 71%

The Moisture Sorption and Mechanical Behaviour in a Humid Atmosphere of Polyurethane Urea with Mixed Polar and Non-Polar Flexible Blocks

Tereshatov

Макарова

Gladkova

et al. 2013

International Polymer Science and Technology

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“…2, spectra 1, dashed and solid lines). As shown in [2], an increase TERESHATOV et al The structure of the rigid domains of the material with poly(tetramethylene oxide) flexible segments is less defective than that of SPUM-2 domains [8]. On moistening of SPUM-1, the amount of the strongest structural formations, self-associates of urea groups, remains essentially unchanged (Fig.…”

Section: Methodsmentioning

confidence: 79%

“…Published data on the behavior of SPUs in moist media mainly concern the moisture transfer in these materials [235] and changes in the structure [2,5,6] and glass transition point [5,6] of moistened polyurethanes. Experiments were performed with thin polyurethane films prepared from solution; in this case, correct estimation of changes in mechanical properties on moistening is complicated by intense moisture exchange with the surrounding medium.…”

mentioning

confidence: 99%

Influence of the Chemical Structure of Flexible Blocks on the Mechanical Properties of Poly(Urethane-Ureas) in a Humid Atmosphere

et al. 2005

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Sorption of moisture on segmented poly(urethane3ureas) with flexible segments of various chemical structures and the effect of a humid atmosphere on the mechanical properties of these materials were studied. Poly(urethane3urea) prepared from mixtures of oligoethers shows advantages from the viewpoint of preservation of high strength in a humid atmosphere.Block polyurethane elastomers, so-called segmented polyurethanes (SPUs), are widely used in various branches of industry thanks to their high strength, good deformation characteristics, and resistance to a number of solvents [1]. Depending on the destination, polyurethane items can operate in air or in direct contact with water (e.g., polyurethane coatings of squeeze rolls in paper-making industry).Published data on the behavior of SPUs in moist media mainly concern the moisture transfer in these materials [235] and changes in the structure [2, 5, 6] and glass transition point [5, 6] of moistened polyurethanes. Experiments were performed with thin polyurethane films prepared from solution; in this case, correct estimation of changes in mechanical properties on moistening is complicated by intense moisture exchange with the surrounding medium. Data on the mechanical properties of the films are limited to the results of their mechanical tests before moistening [3]. Therefore, it is unclear to what extent the mechanical characteristics of various SPUs vary on moistening and how the extent of their variation depends on the polymer structure.Studies in this direction are necessary for understanding how the mechanical characteristics of polyurethanes change on moistening and for choosing formulations of polyurethane materials suitable for operation in moist media.In this study we examined the influence of the relative air humidity, varied in a wide range, on the mechanical properties of SPUs with various flexible segments. Our main goal was to reveal what structure of flexible blocks would provide the highest strength of the polyurethane material in a humid atmosphere. EXPERIMENTALWe used segmented poly(urethane3ureas) with poly(tetramethylene oxide) flexible blocks (SPUM-1), poly(propylene oxide) segments (SPUM-2), mixed polyether blocks (SPUM-3), and mixed polybutadiene3poly(tetramethylene oxide) flexible segments (SPUM-4). To prepare SPUMs, we took prepolymers based on oligo(tetramethylene oxide)diol (M~1700), oligo(propylene oxide)diol Laprol 2102 (M~1950), and polybutadienediol (M~2100, SKU-DF-2 prepolymer). The molecular weight of the oligomeric diols was estimated from the content of hydroxy groups. The prepolymers were prepared by the reactions of appropriate diols with toluylene-2,4-diisocyanate. The prepolymers and their mixtures (in preparation of SPUMs with mixed flexible segments) were cured with 3,3`-dichloro-4,4`-diaminodiphenylmethane (Diamet Kh) by the procedure described in [7].The molar ratio of the prepolymers (or their mixture) to Diamet Kh was 1.03, and the molar ratio of the NCO and OH groups in the synthesis of the prepolymers, 2.1.The isotherm...

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Aspects of the sorption-diffusion processes in segmented polyether urethanes

Cited by 3 publications

References 10 publications

Influence of Moisture Sorption on the Physical and Mechanical Properties of Plasticised Poly(Ether Urethane Ureas)

Influence of Moisture Sorption on the Physical and Mechanical Properties of Plasticised Poly(Ether Urethane Ureas)

The Moisture Sorption and Mechanical Behaviour in a Humid Atmosphere of Polyurethane Urea with Mixed Polar and Non-Polar Flexible Blocks

Influence of the Chemical Structure of Flexible Blocks on the Mechanical Properties of Poly(Urethane-Ureas) in a Humid Atmosphere

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