Polyurethanes

Fink, Johannes Karl

doi:10.1016/b978-081551515-9.50004-4

Cited by 3 publications

(4 citation statements)

References 102 publications

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“…These values hint that the molecular weights of all CMGPOLs satisfy the target 1000–6000 g/mol for flexible foam application. 27 , 31 Figure 2 depicts the corresponding CMGPOL chromatograms, showing that a higher CMG mass ratio led to longer retention times. This suggests that the molecular weight of the polyols decreases with increasing CMG loading.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, commercially available petroleum-based and soybean oil based polyols for this application produced by Dow, VORANOL, Renuva, and Cargill have molecular weights roughly ranging from 700 to 5000 g/mol, OH numbers of 30–250 mg KOH/g, and functionality of 2–3. In general, polyols for FPUF applications must have a molecular weight between 1000 and 6000 g/mol, an OH number between 28 and 160 mg KOH/g, and a functionality of 2–3. ,, …”

Section: Introductionmentioning

confidence: 99%

“…In general, polyols for FPUF applications must have a molecular weight between 1000 and 6000 g/mol, an OH number between 28 and 160 mg KOH/g, and a functionality of 2−3. 27,31,32 For CMG or other vegetable oil based materials to compete with the mentioned products and other commercially available polyols, it must meet the mentioned structural specifications of the fossil competitors. 14,25,27−30 In this regard, there is still no reported nor published research involving the utilization of CMG in polymerization to produce polyols with properties tailored to satisfy the requirements of FPUFs.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In general, polyols for FPUF applications must have a molecular weight between 1000 and 6000 g/mol, an OH number between 28 and 160 mg KOH/g, and a functionality of 2–3. 27 , 31 , 32…”

Section: Introductionmentioning

confidence: 99%

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Flexible Polyurethane Foams Modified with Novel Coconut Monoglycerides-Based Polyester Polyols

Omisol,

Aguinid,

Abilay

et al. 2024

ACS Omega

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Coconut oil, a low-molecular-weight vegetable oil, is virtually unutilized as a polyol material for flexible polyurethane foam (FPUF) production due to the high-molecular-weight polyol requirement of FPUFs. The saturated chemistry of coconut oil also limits its compatibility with widely used polyol-forming processes, which mostly rely on the unsaturation of vegetable oil for functionalization. Existing studies have only exploited this resource in producing low-molecular-weight polyols for rigid foam synthesis. In this present work, high-molecular-weight polyester polyols were synthesized from coconut monoglycerides (CMG), a coproduct of fatty acid production from coconut oil, via polycondensation at different mass ratios of CMG with 1:5 glycerol:phthalic anhydride. Characterization of the CMG-based polyol (CMGPOL) products showed number-average molecular weights between 1997 and 4275 g/mol, OH numbers between 77 and 142 mg KOH/g, average functionality between 4.8 and 5.8, acid numbers between 4.49 and 23.56 mg KOH/g, and viscosities between 1.27 and 89.57 Pa•s. The polyols were used to synthesize the CMGPOL-modified PU foams (CPFs) at 20 wt % loading. The modification of the foam formulation increased the monodentate and bidentate urea groups, shown using Fourier transform infrared (FTIR) spectroscopy, that promoted microphase separation in the foam matrix, confirmed using atomic force microscopy (AFM) and differential scanning calorimetry (DSC). The implications of the structural change to foam morphology and open cell content were investigated using a scanning electron microscope (SEM) and gas pycnometer. The density of the CPFs decreased, while a significant improvement in their tensile and compressive properties was observed. Also, the CPFs exhibited different resiliency with a correlation to microphase separation. These findings offer a new sustainable polyol raw material that can be used to modify petroleum-based foam and produce flexible foams with varying properties that can be tailored to meet specific requirements.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

“…In general, polyols for FPUF applications must have a molecular weight between 1000 and 6000 g/mol, an OH number between 28 and 160 mg KOH/g, and a functionality of 2–3. 27 , 31 , 32…”

Section: Introductionmentioning

confidence: 99%

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