Green and sustainable polyurethanes for advanced applications

Guillame, Sophie M.; Khalil, Hamdy; Misra, Manjusri

doi:10.1002/app.45646

Cited by 27 publications

(19 citation statements)

References 12 publications

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“…Subsequently, many other vitrimer chemistries and approaches have emerged. New vitrimer‐like materials have been designed with chemistries including vinylogous urethanes,30 olefin metathesis,46 boronic esters–boroxine,40b siloxane exchange,32 transcarbamoylation,47 and transamination 48. In short, vitrimers are defined as a class of thermally activated associative CANs that exhibit Arrhenius‐like dependence on viscosity and are characterized by a specific, chemistry‐dependent, “topology freezing temperature” ( T v ).…”

Section: Classification Of Dynamic Covalent Chemistries (Dccs)mentioning

confidence: 99%

Toward Stimuli‐Responsive Dynamic Thermosets through Continuous Development and Improvements in Covalent Adaptable Networks (CANs)

et al. 2020

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Covalent adaptable networks (CANs), unlike typical thermosets or other covalently crosslinked networks, possess a unique, often dormant ability to activate one or more forms of stimuli‐responsive, dynamic covalent chemistries as a means to transition their behavior from that of a viscoelastic solid to a material with fluid‐like plastic flow. Upon application of a stimulus, such as light or other irradiation, temperature, or even a distinct chemical signal, the CAN responds by transforming to a state of temporal plasticity through activation of either reversible addition or reversible bond exchange, either of which allows the material to essentially re‐equilibrate to an altered set of conditions that are distinct from those in which the original covalently crosslinked network is formed, often simultaneously enabling a new and distinct shape, function, and characteristics. As such, CANs span the divide between thermosets and thermoplastics, thus offering unprecedented possibilities for innovation in polymer and materials science. Without attempting to comprehensively review the literature, recent developments in CANs are discussed here with an emphasis on the most effective dynamic chemistries that render these materials to be stimuli responsive, enabling features that make CANs more broadly applicable.

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Section: Classification Of Dynamic Covalent Chemistries (Dccs)mentioning

confidence: 99%

Toward Stimuli‐Responsive Dynamic Thermosets through Continuous Development and Improvements in Covalent Adaptable Networks (CANs)

et al. 2020

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“…Polyurethanes, produced by the reaction of a diol (or polyol) with a diisocyanate (or polyisocyanate), are one of the major kinds of commercial polymers with very wide applications. [1][2][3] Recently, environmentally friendly polyurethanes are gaining increasing attention in both academic and industrial communities, because of depletion and fluctuating prices of fossil resources, environmental issues, and health problems. [4][5][6] Vegetable oils (VOs), natural triglycerides, have been growing up as one of the important renewable resources as building block of polyurethanes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Zhang

Yao

Chen

et al. 2018

J of Applied Polymer Sci

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In this contribution, castor oil polyols with functionality of f = 2.7 and f = 2 are used as soft segments (SS) for synthesizing polyurethane elastomers (PUEs) without addition of petroleum‐based polyol. The effect of molar ratio of castor oil polyols on structure and properties of PUEs has been investigated by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, X‐ray diffraction, tensile, swelling, and water absorption tests. The results reveal that hydrogen bonding mainly exists in hard segments (HSs) and weakens with decreasing the molar percentage of castor oil polyol (f = 2.7) in SS. T g of SS decreases while T g of HS remains constant as molar percentage of castor oil polyol (f = 2.7) decreased. The initial degradation temperatures (T5%) are above 300 °C and independent of the molar ratio of castor oil polyols. However, the temperature at 50% weight loss (T50%) decreases significantly as molar percentage of castor oil polyol (f = 2.7) decreased. Moreover, PUEs exhibit very low water absorption rate, <1%, after immersing in water for 140 h at room temperature. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47309.

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“…The development of bio-based PUs using bio-based/renewable isocyanates and/or polyols has also attracted the interest of academic and industrial researchers [ 15 , 16 , 17 , 18 , 19 ]; accordingly, several review papers have been published that rely on such a necessity [ 20 , 21 , 22 ]. Moreover, the development of isocyanate-free PU-based materials has been recognized as an efficient approach to avoid the toxicity issues associated with the use of isocyanates.…”

Section: Introductionmentioning

confidence: 99%

Flame Retardancy of Bio-Based Polyurethanes: Opportunities and Challenges

et al. 2020

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Sustainable polymers are emerging fast and have received much more attention in recent years compared to petro-sourced polymers. However, they inherently have low-quality properties, such as poor mechanical properties, and inadequate performance, such as high flammability. In general, two methods have been considered to tackle such drawbacks: (i) reinforcement of sustainable polymers with additives; and (ii) modification of chemical structure by architectural manipulation so as to modify polymers for advanced applications. Development and management of bio-based polyurethanes with flame-retardant properties have been at the core of attention in recent years. Bio-based polyurethanes are currently prepared from renewable, bio-based sources such as vegetable oils. They are used in a wide range of applications including coatings and foams. However, they are highly flammable, and their further development is dependent on their flame retardancy. The aim of the present review is to investigate recent advances in the development of flame-retardant bio-based polyurethanes. Chemical structures of bio-based flame-retardant polyurethanes have been studied and explained from the point of view of flame retardancy. Moreover, various strategies for improving the flame retardancy of bio-based polyurethanes as well as reactive and additive flame-retardant solutions are discussed.

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Green and sustainable polyurethanes for advanced applications

Abstract: International audience[No abstract available

Cited by 27 publications

References 12 publications

Toward Stimuli‐Responsive Dynamic Thermosets through Continuous Development and Improvements in Covalent Adaptable Networks (CANs)

Toward Stimuli‐Responsive Dynamic Thermosets through Continuous Development and Improvements in Covalent Adaptable Networks (CANs)

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Flame Retardancy of Bio-Based Polyurethanes: Opportunities and Challenges

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