The effect of varying soft and hard segment length on the structure–property relationships of segmented polyurethanes based on a linear symmetric diisocyanate, 1,4-butanediol and PTMO soft segments

Klinedinst, Derek B.; Jonáš, Alexandr; Zhang, Mingqiang; Wilkes, Garth L.

doi:10.1016/j.polymer.2012.08.005

Cited by 126 publications

(121 citation statements)

References 19 publications

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“…TPUs typically exhibit very good nanophase separation with narrow T g ranges of their respective components [57][58][59][60][61][62][63][64][65][66][67][68][69]. Dynamic mechanical analysis (DMA) of TPUs typically shows sharp transitions with well-defined loss tangent (tan d) peaks over a narrow temperature range [57][58][59][60][61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic mechanical analysis (DMA) of TPUs typically shows sharp transitions with well-defined loss tangent (tan d) peaks over a narrow temperature range [57][58][59][60][61][62][63][64][65][66][67][68][69]. A common criterion to identify effective, broad-temperature-range, acoustic and/ or vibration damping materials is tan d P 0.30 over at least a 60°C temperature range [70][71][72][73][74][75][76][77][78].…”

Section: Introductionmentioning

confidence: 99%

“…This hydrogen bonding can be suppressed by using polypropylene oxide (PPO)-based soft segments with sterically hindered oxygen atoms and polytetramethylene oxide (PTMO)-based soft segments with dilution of oxygen atom content relative to PEO-based soft segments. In a limited demonstration, Torkelson and coworkers [54] showed that the hydroxyl groups can be advantageous in PTMO-based PHUs yielding good damping properties over a broad temperature range, a function not observed in isocyanate-based TPUs [57][58][59][60][61][62][63][64][65][66][67][68][69]. The presence of some level of phase mixing results in materials with broad interphases having a wide range of local composition and therefore broad T g responses.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Beniah

Liu

Heath

et al. 2016

European Polymer Journal

101

111

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a b s t r a c tNon-isocyanate thermoplastic polyhydroxyurethane (PHU) elastomers were synthesized from cyclic carbonate aminolysis using polytetramethylene oxide (PTMO) as soft segment and divinylbenzene dicyclocarbonate and three diamine chain extenders as hard segment with a range of hard-segment content. Characterization was done via Fourier transform infrared spectroscopy, small-angle X-ray scattering (SAXS), uniaxial tensile testing, and dynamic mechanical analysis (DMA). SAXS reveals that these PHUs possess nanophaseseparated morphology with 10-20 nm interdomain spacings. These PHUs display elastomeric response and tunable tensile properties with Young's modulus ranging from 27 to 200 MPa, tensile strength from 0.3 to 9.7 MPa and elongation at break ranging up to greater than 2000%. DMA reveals that nanophase separation in these PHUs is accompanied by broad interphases having a wide range of local composition; this nanophase separation differs significantly from that manifested by thermoplastic polyurethane elastomer (TPU) due to hydrogen bonding of hydroxyl groups in the hard segments to the PTMO soft segment. These PHUs show very good damping performance with tan d P 0.30 over broad temperature ranges (P60°C), which are tunable through simple variation of hardsegment content and chain extender structures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Beniah

Liu

Heath

et al. 2016

European Polymer Journal

101

111

View full text Add to dashboard Cite

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“…8,10,22 In addition, the versatility of PU chemistry allows tailoring the elastomer's dielectric and mechanical properties in a wide range, which might supply more suitable elastomers for DEAs. [23][24][25] The main limitation of PUs as an ideal elastomer is the relatively huge elastic modulus, which is induced by the internal high-density hydrogen bonds. To improve the electromechanical actuation, carbon nanospheres, 26 32 It is interesting to nd that elastomers with reduced elastic modulus and enhanced electromechanical strain can be obtained by changing the chain length of PDMS.…”

Section: Introductionmentioning

confidence: 99%

Remarkably improved electromechanical actuation of polyurethane enabled by blending with silicone rubber

et al. 2017

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Herein we report the highly improved electromechanical actuation of thermoplastic polyurethane (TPU) by blending with polydimethylsiloxane (PDMS) to construct a bicontinuous structure. TPU/PDMS blend films with various PDMS loadings were fabricated through a simple solution-assisted casting method. Infrared spectroscopy measurements confirmed that TPU and PDMS are thermodynamically incompatible with each other. For TPU 80 with 80 parts of PDMS, a bicontinuous phase structure was achieved. The TPU 80 film showed greatly decreased elastic modulus and improved elongation at break compared to pristine TPU. It also showed the highest dielectric constant among the TPU/PDMS blend films with various contents of PDMS due to strong interfacial polarization. Most importantly, the TPU 80 film exhibited a maximum areal strain of 2.3% under an electric field of 40 V mm À1 , which is about 60 times higher than that of pristine TPU. The results described in this work demonstrate that the construction of a bicontinuous interface structure at the micrometer scale is very effective to develop elastomers with superior electromechanical actuation performance.

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“…The TPE properties are a result of combining the individual features of the respective blocks; hence, a change of their chemical structure or their relative mass fraction enables a modification of the macromolecule properties in the desired directions [16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical and thermal properties of multiblock terpoly(ester-ether-amide) thermoplastic elastomers with variable molecular weight of ester block

Rokicka

Lenarczyk

Ukielski

2016

J Therm Anal Calorim

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A series of the terpolymers of poly[(tetramethylene terephthalate)-block-(oxytetramethylene)-blocklaurolactam] with a variable molecular weight of ester block and the constant molar ratio of ether block to the amide block equal to 3:1 were obtained. The influence of variations in the molecular weight of ester block on the functional properties and on the values of phase change temperatures of the products was determined. The thermal properties and the phase separation of obtained systems were defined by DSC, DMTA and WAXS methods. The mechanical and elastic properties of obtained polymers were evaluated.

show abstract

The effect of varying soft and hard segment length on the structure–property relationships of segmented polyurethanes based on a linear symmetric diisocyanate, 1,4-butanediol and PTMO soft segments

Cited by 126 publications

References 19 publications

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Remarkably improved electromechanical actuation of polyurethane enabled by blending with silicone rubber

Synthesis and mechanical and thermal properties of multiblock terpoly(ester-ether-amide) thermoplastic elastomers with variable molecular weight of ester block

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