Ionomeric Thermoplastic Elastomers

Drobny, Jiri George

doi:10.1016/b978-081551549-4.50013-x

Cited by 98 publications

(161 citation statements)

References 4 publications

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“…71 Polyesters obtained from the reactions of SKL with dicarboxylic aliphatic (sebacoyl) or aromatic (terephthaloyl) acid chlorides showed very interesting thermal behaviour. 65,74 Lignin polyurethane copolymers are good examples of thermoplastic elastomers. In the study it was also found that the thermal stability improved compare to the starting KL.…”

Section: Scheme 5 Polyesters Synthesized Bymentioning

confidence: 99%

Thermal properties of lignin in copolymers, blends, and composites: a review

2015

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The need for renewable alternatives to conventional petroleum based polymers has been the motivation for work on biobased composites, blends and materials whose foundations are carbon neutral feedstocks. Lignin, an abundant plant derived feedstock, and waste byproduct of the cellulosic ethanol and pulp and paper industry, qualifies as a renewable material. Despite the fact that it is often difficult to blend lignin with other polymers due to its complex structure and reactivity, published research over the past decade, has focused on issues such as lignin miscibility with other polymers, the thermal and mechanical strength behavior of its copolymers and its fractions as well as efforts of tuning its thermal properties via chemical modifications and other means. As such this effort now attempts to offer a comprehensive overview that largely discusses the importance of these processes with the aim toward effective, cost efficient and environmentally friendly means that may allow the utilization of this important and largely ignored biopolymer.

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Section: Scheme 5 Polyesters Synthesized Bymentioning

confidence: 99%

Thermal properties of lignin in copolymers, blends, and composites: a review

2015

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“…[6] We have recently reported the successful synthesis of new thermoplastic copolymers from lignin, which are rubbery polyester copolymers [7] and robust polyurethane copolymers. [9] Our previous work demonstrated that the lignin content and glass transition temperature (T g ) can be tuned to achieve the desired properties. [9] Our previous work demonstrated that the lignin content and glass transition temperature (T g ) can be tuned to achieve the desired properties.…”

Section: Introductionmentioning

confidence: 99%

Methanol Fractionation of Softwood Kraft Lignin: Impact on the Lignin Properties

et al. 2013

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The development of technologies to tune lignin properties for high-performance lignin-based materials is crucial for the utilization of lignin in various applications. Here, the effect of methanol (MeOH) fractionation on the molecular weight, molecular weight distribution, glass transition temperature (Tg ), thermal decomposition, and chemical structure of lignin were investigated. Repeated MeOH fractionation of softwood Kraft lignin successfully removed the low-molecular-weight fraction. The separated high-molecular-weight lignin showed a Tg of 211 °C and a char yield of 47 %, much higher than those of as-received lignin (Tg 153 °C, char yield 41 %). The MeOH-soluble fraction of lignin showed an increased low-molecular-weight fraction and a lower Tg (117 °C) and char yield (32%). The amount of low-molecular-weight fraction showed a quantitative correlation with both 1/Tg and char yield in a linear regression. This study demonstrated the efficient purification or fractionation technology for lignin; it also established a theoretical and empirical correlation between the physical characteristics of fractionated lignins.

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“…polyamide elastomers, polyester elastomers, and polyurethane elastomers are important segmented copolymers, which have been widely used for plastics goods in automobile and aviation applications. 11,12 There are many studies on the deformation mechanism of these TPEs. The crystal transitions of poly(butylene terephthalate) (PBT) or poly(tetramethylene terephthalate) (PTMT) were found to be reversible during the deformation of polyester-based elastomers with poly(tetramethylene oxide) (PTMO) as the soft segment.…”

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confidence: 99%

Microstructural evolution underlying the ternary stages of the elastic behaviors for poly(ether‐b‐amide) copolymer elastomers

Zhu

Dong

Huang

et al. 2018

J Polym Sci B Polym Phys

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Three stages of elastic behavior were observed during cyclic deformations for poly(ether‐b‐amide) (PEBA) segmented copolymers based on crystalline hard segments of polyamide 12 (PA12) and amorphous soft segments of poly(tetramethylene oxide) (PTMO). The underlying microstructural evolution was characterized by a combination of in situ Fourier transform infrared spectroscopy (FTIR), wide‐angle X‐ray diffraction (WAXD), and small‐angle X‐ray scattering (SAXS) technologies. The γ–α″ phase transition of crystalline PA12 occurred upon stretching, and the orientation of the α″ phase was less reversible under larger strains. PTMO chain orientation cannot be restored to the initial state, contributing to plastic deformation. Driven by the entropy effect, the strain‐induced crystallization of PTMO can fuse during sample retarding, exerting little influence on the residual strain. For PEBA with a shore D hardness of 35 D, the long period (L) can be restored to the initial L after the sample was unloaded until system fibrillation. The tie molecules between adjacent oriented lamellae can be by drawn out high stress in a PEBA material with a shore D hardness of 40 D, and the relaxation led to a second long period. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 855–864

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Ionomeric Thermoplastic Elastomers

Cited by 98 publications

References 4 publications

Thermal properties of lignin in copolymers, blends, and composites: a review

Thermal properties of lignin in copolymers, blends, and composites: a review

Methanol Fractionation of Softwood Kraft Lignin: Impact on the Lignin Properties

Microstructural evolution underlying the ternary stages of the elastic behaviors for poly(ether‐b‐amide) copolymer elastomers

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