Chemistry and technology of polyols for polyurethanes. Milhail Ionescu. Rapra Technology, Shrewsbury, UK

Tersac, Gilles

doi:10.1002/pi.2159

Cited by 81 publications

(114 citation statements)

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“…It's 353 important to note that these differences between the OH values were due to the fatty composition of 354 the starting oils. According to these values, we can expect the preparation of rigid foams [45] a one single step. The physico-chemical and spectroscopic analysis presented above successfully 367 characterized the reaction of polyols formation.…”

Section: Ft-ir Analysis 283mentioning

confidence: 98%

Preparation of Renewable Bio-Polyols from Two Species of <em>Colliguaja</em> for Rigid Polyurethane Foams

Abril

Valdés

Mirabal‐Gallardo

et al. 2018

Preprint

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In this study we investigated the potential of two non-edible oil extracts from seeds of Colliguaya Integerrima (CIO) and Colliguaja Salicifolia (CSO) to use as a renewable source for polyols and eventually polyurethane foams or biodiesel. For this purpose, two novel polyols from the aforementioned oils were obtained in a one-single step reaction using a mixture of hydrogen peroxide and acetic acid. The polyol derivatives obtained from the two studied oils were characterized by spectral (FT-IR, 1H NMR and 13C NMR), physico-chemical (e.g. chromatographic analysis, acid value, oxidizability values, iodine value, peroxide value, saponification number, kinematic viscosity, theorical molecular weights, density, hydroxyl number and hydroxyl functionality) and thermal (TGA) analyses according to standard methods. Physico-chemical results revealed that all parameters, with the exception of the iodine value, were higher for bio-polyols (CSP and CIP polyols) compared to the starting oils. The NMR, TGA and FT-IR analyses demonstrated the formation of polyols. Finally, the OH functionality values for CIP and CSP polyols were 4.50 and 5.00, respectively. This result indicated the possible used of CIP and CSP polyols as a raw material for the preparation of polyurethane rigid foams.

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Section: Ft-ir Analysis 283mentioning

confidence: 98%

Preparation of Renewable Bio-Polyols from Two Species of <em>Colliguaja</em> for Rigid Polyurethane Foams

Abril

Valdés

Mirabal‐Gallardo

et al. 2018

Preprint

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“…Generally, reactive flame retardants display higher thermal stability compared to additives, due to their chemical bonding with polymer chains. Unlike additive flame retardant, reactive flame retardants do not migrate under ageing conditions and hence provide flame retardancy over time [88,89]. Moreover, incorporation of flame retardant as the reactive part in the polymer structure avoids the deterioration of mechanical properties due to enhanced dispersion of flame retardant throughout the polymer chains [90].…”

Section: "Reactive" Flame Retardants In Bio-based Pusmentioning

confidence: 99%

“…The authors performed a series of analyses including TGA, TGA coupled with Fourier-transform infrared (FTIR) spectroscopy, char analysis by FTIR, and X-ray photoelectron spectroscopy (XPS) and suggested a mechanism for thermal degradation of their bio-based PU; see Figure 4. The mechanism of thermal degradation proposed by Ding et al [89] suggested a first step of degradation from room temperature to 308 • C consisting of P-O-C and P-C bond breakup, which led to the formation of phosphoric acid, H 2 O, and CO 2 . Then, from 308 • C to 378 • C, the degradation of urethane groups led to the formation of isocyanate and hydroxyl compounds.…”

Section: Type Of Pumentioning

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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“…The hard segments arrange and disperse within the continuous or semi-continuous rubbery matrix of softsegments [11], providing good elastomeric behavior for polyurethanes [12,13]. Physicomechanical properties of polyurethanes are highly dependent on the type, content and functionality of the materials used for their synthesis, which can be varied from soft thermoplastic to hard and brittle thermoset elastomers [14][15][16]. Application of polyurethane membranes to separate gases, mixtures of organic liquids, as well as biological and thermosensitive membranes have been the focus of many studies [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%