Natural Resources for   Polyurethanes Industries

Asare, Magdalene A.; Souza, Felipe M. de; Gupta, Ram K.

doi:10.1201/9781003278269-3

Cited by 2 publications

(1 citation statement)

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“…They are, however, susceptible to hydrolytic destruction when implanted in the body, even for brief periods. To address this, polycaprolactone [ 12 ], polylactide [ 13 ], vegetable oils [ 14 , 15 , 16 , 17 ], and other biobased polyols [ 18 , 19 , 20 ] have been utilised.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Soft Segment Structure on the Properties of Polyurethanes

Ristić,

Cakić,

Vukić

et al. 2023

Polymers

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A series of polyurethanes (PU) were synthesised via one-step polymerisation without a chain extender, using toluene diisocyanate as well as a variety of soft segments composed of different macrodiols. Poly(D,L-lactide) (PDLLA) and polycaprolactone diol (PCL) were synthesised as a polyester type polyols to obtain soft segments. The process of varying the molar ratio of newly synthesised PDLLA in soft segments has been confirmed as a powerful tool for fine-tuning the final properties of PU. Fourier-transformed infrared spectroscopy was used for evaluation of molecular structures of synthesised PDLLA polyol and final PU. Nuclear magnetic resonance spectrometry was used to confirm the presumed structure of PU. The influence of soft segment composition on polyurethane thermal characteristics was examined using thermogravimetric analysis and differential scanning calorimetry. The composition of soft segments had little impact on the thermal stability of PU materials, which is explained by the comparable structures of both polyester polyols. Wide-angle X-ray scattering was utilised to evaluate the effect of amorphous PDLLA on the degree of crystallinity of PCL in soft PU segments. It was discovered that not only did the PDLLA ratio in the soft segment have a substantial influence on the degree of microphase separation in the soft and hard segments, but it also influenced the crystallisation behaviour of the materials. Furthermore, the restriction of crystallisation of the PCL soft segment has been verified to be dependent on the hard segment concentration and the ratio of PDLLA/PCL polyols. The sample with pure PCL as the polyol component achieved the highest degree of crystallinity (34.8%). The results demonstrated that the composition of soft segments directly affected the properties of obtained polyurethane films. These results can be utilised to easily achieve a desirable set of properties required for application in biomaterials.

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Section: Introductionmentioning

confidence: 99%

The Influence of Soft Segment Structure on the Properties of Polyurethanes

Ristić,

Cakić,

Vukić

et al. 2023

Polymers

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Development and Application of a Lignin-Based Polyol for Sustainable Reactive Polyurethane Adhesives Synthesis

Serrano-Martínez,

Hernández-Fernández,

Pérez-Aguilar

et al. 2024

Polymers

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In response to the environmental impacts of conventional polyurethane adhesives derived from fossil fuels, this study introduces a sustainable alternative utilizing lignin-based polyols extracted from rice straw through a process developed at INESCOP. This research explores the partial substitution of traditional polyols with lignin-based equivalents in the synthesis of reactive hot melt polyurethane adhesives (HMPUR) for the footwear industry. The performance of these eco-friendly adhesives was rigorously assessed through Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), rheological analysis, and T-peel tests to ensure their compliance with relevant industry standards. Preliminary results demonstrate that lignin-based polyols can effectively replace a significant portion of fossil-derived polyols, maintaining essential adhesive properties and marking a significant step towards more sustainable adhesive solutions. This study not only highlights the potential of lignin in the realm of sustainable adhesive production but also emphasises the valorisation of agricultural by-products, thus aligning with the principles of green chemistry and sustainability objectives in the polymer industry.

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Natural Resources for Polyurethanes Industries

Cited by 2 publications

References 0 publications

The Influence of Soft Segment Structure on the Properties of Polyurethanes

The Influence of Soft Segment Structure on the Properties of Polyurethanes

Development and Application of a Lignin-Based Polyol for Sustainable Reactive Polyurethane Adhesives Synthesis

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