Synthesis and microstructure–mechanical property relationships of segmented polyurethanes based on a PCL–PTHF–PCL block copolymer as soft segment

Rueda-Larraz, L.; d’Arlas, Borja Fernández; Tercjak, Agnieszka; Ribes, A.; Mondragón, Iñaki; Eceiza, Arantxa

doi:10.1016/j.eurpolymj.2009.03.013

Cited by 202 publications

(163 citation statements)

References 53 publications

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“…Intermolecular attraction, such as hydrogen bonding and dipole-dipole interaction, between hard segments can be analyzed from the IR spectra, where the bonded C=O stretching vibration appears at 1699 to 1706 cm −1 and is slightly lower than that of the free carbonyl group (1731 to 1733 cm −1 ). 13,14 As the second MDI content increased, the bonded carbonyl peak slightly increased compared to the free carbonyl in Figure 3, suggesting that molecular interactions were augmented by crosslinking. It was determined from the IR spectra that the MDI-mediated crosslinking was formed based on the change in vibration mode.…”

Section: 7mentioning

confidence: 94%

The MDI-Mediated Lateral Crosslinking of Polyurethane Copolymer and the Impact on Tensile Properties and Shape Memory Effect

Chung¹,

Choi²,

Chung³

et al. 2012

Bulletin of the Korean Chemical Society

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Section: 7mentioning

confidence: 94%

The MDI-Mediated Lateral Crosslinking of Polyurethane Copolymer and the Impact on Tensile Properties and Shape Memory Effect

Chung¹,

Choi²,

Chung³

et al. 2012

Bulletin of the Korean Chemical Society

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“…Polyurethanes require an analysis of the carbonyl stretching region, which gives some information about their order of hard domains or degree of microphase separation. The spectrum of the RPUR H showed a sharp band at 1684 cm -1 , while that of the RPUR HM exhibited a broader one at 1701 cm -1 , characteristic of the H-bonded urethane carbonyl groups [22,23], in well-ordered ''crystalline'' structures and disordered ''amorphous'' ones, respectively. This was in agreement with the results of DSC and XRD analyses.…”

Section: Polymer Characterizationmentioning

confidence: 97%

Aliphatic polycarbonate-based thermoplastic polyurethane elastomers containing diphenyl sulfide units

Rogulska

Kultys

2016

J Therm Anal Calorim

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New thermoplastic polyurethane elastomers (TPUs) were obtained by a one-step melt polyaddition from 30, 45 and 60 mol% aliphatic polycarbonate diol of M n = 2000 g mol -1 (Desmophen Ò C2200, Bayer), 1,1 0 -methanediylbis(4-isocyanatocyclohexane) (HMDI) or 1,6-diisocyanatohexane (HDI) and 2,2 0 -[sulfanediylbis(benzene-1,4-diyloxy)]diethanol (acting as a chain extender). The TPUs were examined by FTIR, UV-Vis, atomic force microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetry (TG) and TG-FTIR. Moreover, their Shore A/D hardness, tensile, adhesive and optical properties were determined. The obtained TPUs were transparent or opaque high molar mass materials, showing amorphous or partially crystalline structures. The HDI-based TPUs exhibited lower glass-transition temperatures than those based on HMDI (from -35 to -31°C vs. from -20 to 1°C) as well as a higher degree of microphase separation. The TPUs were stable up to 262-272°C, taking into account the temperature of 1 % mass loss, with somewhat higher values shown by those from HDI. They decomposed in two stages. The main volatile products of the hard-segment decomposition were carbon dioxide, water and carbonyl sulfide, while aliphatic ethers, aldehydes and unsaturated alcohols, as well as carbon dioxide, originated from the soft-segment decomposition. The synthesized TPUs, with hardness in the range of 80-90°Sh A, possessed a good tensile strength (33.0-38.7 MPa), similar to that of the commercial biodurable medical grade TPU ChronoFlex Ò AL 80A (37.9 MPa), prepared from aliphatic polycarbonate diol, HMDI and butane-1,4-diol.

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“…It is obvious to assume that interactions will be different in polyurethanes prepared from the two kinds of polyols, and experience supports this assumption by showing that the properties of products prepared from them differ considerably [26]. Although the effect of the structure and characteristics of the polyol on PU properties have been investigated extensively [27][28][29][30], many questions related to structure-property correlations in these materials remain open. The goal of this communication is to discuss the possible effect of specific interactions on the structure and properties of segmented linear polyurethane elastomers.…”

Section: Introductionmentioning

confidence: 99%

Specific interactions, structure and properties in segmented polyurethane elastomers

Bagdi

Molnár

Sajó

et al. 2011

Express Polym. Lett.

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Abstract. Two sets of segmented polyurethane (PU) elastomers were prepared from 4,4!-methylenebis(phenyl isocyanate) (MDI), 1,4-butanediol (BD) and a polyester or a polyether polyol, respectively. The molecular mass of both polyols was 1000 g/mol. The stoichiometric ratio of isocyanate and hydroxyl groups was 1 and the polyol/total diol ratio changed from 0 to 1 in 0.1 steps. One step bulk polymerization was carried out in an internal mixer and the samples were compression molded for testing. The results proved that specific interactions determine the phase structure and properties of these materials. Crystallinity was approximately the same in the two types of polyurethanes and the amount of relaxing soft segments was also similar. The determination of interaction parameters from solvent absorption and differences in glass transition temperatures indicated stronger interaction between hard and soft segments in the polyester than in the polyether polyurethane. Larger transparency of the polyester PU indicated the formation of smaller dispersed particles of the hard phase. The larger number of smaller hard phase units led to the formation of more physical cross-links distributed more evenly in the polymer. These differences in the phase structure of the polymers resulted in stronger strain hardening tendency, larger strength and smaller deformations for the polyester than for the polyether polyurethane.

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Synthesis and microstructure–mechanical property relationships of segmented polyurethanes based on a PCL–PTHF–PCL block copolymer as soft segment

Cited by 202 publications

References 53 publications

The MDI-Mediated Lateral Crosslinking of Polyurethane Copolymer and the Impact on Tensile Properties and Shape Memory Effect

The MDI-Mediated Lateral Crosslinking of Polyurethane Copolymer and the Impact on Tensile Properties and Shape Memory Effect

Aliphatic polycarbonate-based thermoplastic polyurethane elastomers containing diphenyl sulfide units

Specific interactions, structure and properties in segmented polyurethane elastomers

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