Biobased Polyols Using Thiol-Ene Chemistry for Rigid Polyurethane Foams with Enhanced Flame-Retardant Properties

Ranaweera, C. K.; Ionescu, Mihail; Bilić, Nikola; Wan, Xianmei; Kahol, Pawan K.; Gupta, Ram K.

doi:10.7569/jrm.2017.634105

Cited by 45 publications

(44 citation statements)

References 8 publications

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“…6,27 Density for all the prepared PU foams can be noticed from Figure 4(a). 6,27 Density for all the prepared PU foams can be noticed from Figure 4(a).…”

Section: Resultsmentioning

confidence: 89%

“…Figures 5 and S3 shows SEM images of LDM-GAE-Jeffol-Foam and its derivatives after addition of a different amount of aliphatic and aromatic bromine-based polyols. 6,14 However, reactive-based flame retardants eliminate all such possibilities and give homogeneous cell structure. Even after the addition of RFR-polyols, there was no momentous change observed which could depreciate the cellular properties of the final foams, although the cellular size was observed to vary with addition of Br-polyols such as in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

“…1 Foaming, an important phenomenon leading to various kinds of flexible and rigid structure in PU, makes them useful for wide range of applications such as in automotive, construction, medical, packaging, furniture, thermal, electrical, and vibration insulation. [4][5][6][7][8][9] Mercaptenized limonene is one of such interesting replacement applicable for rigid foams as per our past reporting. Numerous studies have been done for replacement of petroleum source to bio-based derivation.…”

Section: Introductionmentioning

confidence: 83%

“…6 The rigid PU foams were prepared in two steps. The equivalent weight of isocyanate to polyols for all the foams was calculated as per our previous report.…”

Section: Preparation Of Rigid Flame-retardant Pu Foamsmentioning

confidence: 99%

“…Some of such replacements include modification of castor oil, soybean oil, limonene, linseed oil, palm oil, corn oil, canola oil, cardanol, sunflower oil, sugar alcohols, and many more. 1 Ranaweera et al 6 synthesized limonene-based rigid flame-retardant PU foam using dimethyl methyl phosphonate (DMMP) as an AFR. 4 It was observed that mercaptenized limonene provided high purity polyol product with narrow molecular weight distribution compared to non-mercaptenized polyol and can be used for producing high-quality rigid PU foams.…”

Section: Introductionmentioning

confidence: 99%

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Highly flame‐retardant bio‐based polyurethanes using novel reactive polyols

Bhoyate

Ionescu

Radojčić

et al. 2017

J of Applied Polymer Sci

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Poor flame retardancy of polyurethanes (PU) is a global issue as it limits their applications particularly in construction, automobile, and household appliances industries. The global challenge of high flammability of PU can be addressed by incorporating flame-retardant materials. However, additive flame-retardants are non-compatible and depreciate the properties of PU. Hence, reactive flame-retardants (RFR) based on aliphatic (Ali-1 and Ali-2) and aromatic (Ar-1 and Ar-2) structured bromine compounds were synthesized and used to prepare bio-based PU using limonene dimercaptan. The aromatic bromine containing foams showed higher close cell content (average 97 and 100%) and compressive strength (230 and 325 kPa) to that of aliphatic bromine containing foams. Similar behavior was observed for a horizontal burning test where with a low concentration of bromine (5 wt %) in the foams for Ar-1 and Ar-2 displayed a burning time of 12.5 and 11.8 s while, Ali-1 and Ali-2 displayed burning time of 25.7 and 37 s, respectively. Neat foam showed a burning time of 74 s. The percentage weight loss for neat PU foam was 26.5%, while foams containing 5 wt % bromine in Ali-1, Ali-2, Ar-1, and Ar-2 foams displayed weight loss of 11.3, 14, 7.9, and 14%, respectively. Our results suggest that flame retardant PU foams could be prepared effectively by using RFR materials.

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“…6,27 Density for all the prepared PU foams can be noticed from Figure 4(a). 6,27 Density for all the prepared PU foams can be noticed from Figure 4(a).…”

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

“…6 The rigid PU foams were prepared in two steps. The equivalent weight of isocyanate to polyols for all the foams was calculated as per our previous report.…”

Section: Preparation Of Rigid Flame-retardant Pu Foamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Highly flame‐retardant bio‐based polyurethanes using novel reactive polyols

Bhoyate

Ionescu

Radojčić

et al. 2017

J of Applied Polymer Sci

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Thiol–Ene (Click) Reactions as Efficient Tools for Terpene Modification

Firdaus

2017

Asian J Org Chem

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This Focus Review highlights the application of thiol-ene (click) chemistry to the productiono fadiverse range of materials that are derived from terpenes. To present an overview concerning the potencyo ft erpenes as renewable resources, recent advances in their developmentb y using synthetic organic chemistry are initially discussed. In addition, the use of thiol-enec hemistry as an efficient approach and versatile tool for noncatalytic carbonÀheteroatom bond formation is briefly presented, including mecha-nistic and kinetic aspects, as well as some structuralc onsiderations,t hat is, the influenceo ft he thiol and olefin structures, which should be well-thought-out before applying such chemistry.T his discussiona lso coversh ow an initiator works and its effect on the reactionr ate. Moreover,t he utilization of thiol-ene reactions for the synthesis of terpenebased valuable platform chemicals, monomers, and polymers, includingr ecent examples that demonstrate its broad utility,a re highlighted.[a] Dr.M.F irdaus Scheme11. Terpene-basedp olythioethers thatwere prepared by thiol-ene photopolymerization. [100] Scheme12. Preparation of cross-linkedthin films that were derived from limonene and their possible addition type. [101] Asian

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Highly flame‐retardant polyurethane foam based on reactive phosphorus polyol and limonene‐based polyol

Bhoyate

Ionescu

Kahol

et al. 2018

J of Applied Polymer Sci

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Polyurethane foams are in general flammable and their flammability can be controlled by adding flame-retardant (FR) materials. Reactive FR have the advantage of making strong bond within the polyurethane chains to provide excellent FR over time without compromising physico-mechanical properties. Here, phenyl phosphonic acid and propylene oxide-based reactive FR polyol was synthesized and used along with limonene based polyol for preparation of FR polyurethanes. All the obtained foams showed higher closed cell content (above 96%). By the addition of FR-polyol, the compressive strength of the foams showed 160% increment which could be due to reactive nature of FR-polyol. Moreover, 1.5 wt % of phosphorus (P) content reduced the self-extinguishing time of the foam from 81 (28% weight loss) to 11.2 s (weight loss of 9.8%). Cone test showed 68.6% reduction in peak heat release rate along with 23.4% reduction in thermal heat release. The change in char structure of carbon after burning was analyzed using Raman spectra which, suggests increment in the graphitic phase of the carbon over increased concentration of phosphorus. It can be concluded from this study that phosphorous based polyol could be blended with bio-based polyols to prepare highly FR and superior physico-mechanical rigid polyurethane foams.

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Biobased Polyols Using Thiol-Ene Chemistry for Rigid Polyurethane Foams with Enhanced Flame-Retardant Properties

Cited by 45 publications

References 8 publications

Highly flame‐retardant bio‐based polyurethanes using novel reactive polyols

Highly flame‐retardant bio‐based polyurethanes using novel reactive polyols

Thiol–Ene (Click) Reactions as Efficient Tools for Terpene Modification

Highly flame‐retardant polyurethane foam based on reactive phosphorus polyol and limonene‐based polyol

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