Novel metallomesogenic polyurethanes: Synthesis, characterization and properties

Senthilkumar, N.; Narasimhaswamy, T.; Kim, Il-Jin

doi:10.1016/j.msec.2012.06.008

Cited by 6 publications

(3 citation statements)

References 67 publications

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“…17-20 metallic organic polymers 21,22 and heterocyclic 23,24 have been shown to be effective to improve the thermo-stability, but still with a low stress modulus and strain behaviours. The high elasticity and high modulus of PUs were dependent on the aggregates of phase-separated.…”

Section: Si-omentioning

confidence: 99%

Tuning chain extender structure to prepare high-performance thermoplastic polyurethane elastomers

Wang

Zhang

et al. 2018

RSC Adv.

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In this work, a novel strategy is developed to solve the issue of mutually exclusive high mechanical robustness and thermo-stability for thermoplastic polyurethane (PU). A leaf-like and reticulate interfingering superstructure can be seen. The superstructure of polyurethanes can also be tuned by the polarity of chain extender molecular via changing the number for ferrocene redox centres, thus to further enhance the thermal stability and elasticity of PUs. As a result, by incorporating bisferrocene units into the main chain of PU, a high-performance PU elastomer can be synthesized with a highest initial degradation temperature of T 5% of 345 C, a highest tensile strength of 42.3 MPa with an elongation over 1000%, as well as a toughness of 19.6 GJ m À3. These results conclusively suggest that high-performance thermoplastic polyurethane elastomers had great promise for potential application in a wide range of practical fields.

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Section: Si-omentioning

confidence: 99%

Tuning chain extender structure to prepare high-performance thermoplastic polyurethane elastomers

Wang

Zhang

et al. 2018

RSC Adv.

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“…Monographs and reviews have been published in which a complete description of synthesis, properties, and applications of a variety of metal containing polymers is reported . Metal containing PUs and polyureas is the subject of extensive research because these polymers exhibit low viscosity, liquid crystalline properties, and unusual thermal properties …”

Section: Introductionmentioning

confidence: 99%

Characterization of Phase Structures of Novel Metallo‐Polyurethanes

Lucio

Fuente

Cerrada

2015

Macro Chemistry & Physics

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Two series of chemically well-defi ned polyurethanes (PUs) have been synthesized containing two different soft segments of interest in aerospace applications. At a given soft fragment, four different hard segments (HSs) based on single diisocyanate molecules with no chain extenders have been incorporated. Both segmented PU series have been prepared by stoichiometric reactions of the macrodiol hydroxyl-terminated polybutadiene (HTPB), and a metallo-derived, this being the (ferrocenylbutyl) dimethylsilane grafted on HTPB, so-called Butacene. Those HSs are isophorone diisocyanate, toluene-2,4-diisocyanate, 4,4′-diphenyl methane diisocyanate, and hexamethylene diisocyanate. Microphase separation and morphology development have been studied at room temperature in these copolymers using Fourier transform infrared spectroscopy, analyzing the change in the relative intensities of free and hydrogen-bonded carbonyl peaks. Measurements of wide-and small-angle X-ray diffraction using synchrotron radiation allow analyzing the morphological and microstructural differences between these two series of samples. In addition, dynamic mechanical analysis and differential scanning calorimetry have been used to learn about the relaxation processes and thermal transitions that are observed in these materials and to confi rm the existence or lack of phase segregation. The knowledge of structure-property relationship is very important in these advanced organometallic PUs to get an understanding of their application as solid composite propellants binder.

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“…The introduction of the mesogenic molecules into the main chain or as side groups of a polymer may lead to liquid crystalline polymer (LCP), which combines the anisotropic properties of liquid crystals and the elastic properties of the polymeric materials. [1][2][3][4] Side-chain liquid crystalline polymers (SCLCP) have been known as an important class of polymers due to their distinctive features in the eld of nonlinear optics and optical information storage devices, [5][6][7] and thus designing of new SCLCP materials has become a fascinating area of current research. The structural properties of SCLCP are not only dened by the type of mesogenic group and polymer scaffold, but also by the graing density of mesogenic groups, length and exibility of spacer between mesogenic group and the polymer chain.…”

Section: Introductionmentioning

confidence: 99%