Chemistry and Basic Intermediates

Hepburn, C.

doi:10.1007/978-94-011-2924-4_1

Cited by 10 publications

(7 citation statements)

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“…[23]. This segmented polymer chain structure leads to a two-phase system and is highly heterogeneous and dependent on the reaction conditions and the reactivity of the components and the use and choice of catalysts [24][25][26]. The SS is selected to have a glass transition temperature (Tg) sufficiently below the desired service temperature of the PU to deliver the mechanical properties required, whereas the HS has its Tg or melting temperature (Tm) well above the anticipated service temperature of the PU [26,27].…”

Section: Generalmentioning

confidence: 99%

“…The final PU structure depends largely on the macrodiol used, which reacts with the isocyanate initially during the PU synthesis to form the flexible segments [24]. The macrodiols used for manufacturing PU elastomers typically include those with a main chain formed from polyesters, polyethers, or polyalkyls (Error!…”

Section: Macrodiolsmentioning

confidence: 99%

“…While isocyanates are capable of undergoing many reactions, their significance is usually in the context of their relationship to PU polymerization and structure [62]. During PU synthesis, diisocyanates are responsible for chain extension and the formation of urethane linkages or a variety of crosslinks by further reaction [24]. The HSs are usually formed by the reaction of a diisocyanate with a glycol or a diamine, although occasionally other ChExs are employed [31].…”

Section: Isocyanatesmentioning

confidence: 99%

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Degradation and stabilization of polyurethane elastomers

Xie

Zhang

Bryant

et al. 2019

Progress in Polymer Science

415

301

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Section: Generalmentioning

confidence: 99%

Section: Macrodiolsmentioning

confidence: 99%

Section: Isocyanatesmentioning

confidence: 99%

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Degradation and stabilization of polyurethane elastomers

Xie

Zhang

Bryant

et al. 2019

Progress in Polymer Science

415

301

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“…In the process of preparing modified starch, some NCO groups of PUP were consumed by water to form urea, and the urea could be further chain branched or crosslinked with NCO groups to form biuret. 13 Branched or cross-linked polyurethane with many NCO groups was thus obtained. The polyurethane then formed polyurethane particles under the shear stress (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

Structure and properties of tough starch modified with rubber-based polyurethane microparticles

Weng

Dou

Deng

et al. 2018

Journal of Thermoplastic Composite Materials

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We prepared a novel covalent rubber-based polyurethane/starch composites material via a simple and effective method. Infrared, scanning electron microscopic, and mechanical tests demonstrated that polyurethane microparticles showed good compatibility with starch as the polyurethane content increases. This is mainly because of the urethane bond newly formed by –OH in starch and –NCO in rubber-based polyurethane. And when the rubber-based polyurethane content increased from 20% to 30%, its elongation at break improved by 116.9%. CPB30 showed excellent hydrophobicity and toughness, which showed potential application.

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“…The most common polyols in the synthesis of PUs are polyesters, polyethers, and, less commonly, polycaprolactones and polycarbonate diol polyols. The chemical nature, structure, and molecular weight of the polyols have an important influence on the properties and performance of the PUs [14,15].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Interactions between Soft Segments in Polyurethanes: Structural Synergies in Blends of Polyester and Polycarbonate Diol Polyols

Paez-Amieva,

Martín-Martínez

2023

Polymers

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There are no previous studies on the interactions between polyols of different nature as a model for understanding the interactions between soft segments in PUs. In this study, different blends of two polyols of different natures (polyester—PE, and polycarbonate diol—CD) and similar molecular weights were prepared and their structural, thermal, surface, viscoelastic, and self-adhesion properties were assessed. Different experimental techniques were used: infrared spectroscopy (ATR-IR), differential scanning calorimetry (DSC), X-ray diffraction, thermal gravimetric analysis (TGA), and plate–plate rheology. PE showed a larger number of structural repeating units and a higher number of polar groups than CD, but the carbonate–carbonate interactions in CD were stronger than the ester–ester interactions in PE. The blending of CD and PE imparted synergic structural properties, particularly in the blends containing less than 50 wt.% PE, they were associated with the disrupt of the carbonate–carbonate interactions in CD and the formation of new ester–carbonate and hydroxyl–carbonate interactions. CD + PE blends with less than 50 wt.% PE exhibited higher glass transition temperatures, a new diffraction peak at 2θ = 24°, one additional thermal degradation at 426–436 °C, and a less-steep decline of the storage moduli. Furthermore, the different interactions between the polyol chains in the blends were also evidenced on their surface properties, and all CD + PE blends showed self-adhesion properties which seemed related to the existence of ester–carbonate and carbonate–carbonate interactions.

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Chemistry and Basic Intermediates

Cited by 10 publications

References 0 publications

Degradation and stabilization of polyurethane elastomers

Degradation and stabilization of polyurethane elastomers

Structure and properties of tough starch modified with rubber-based polyurethane microparticles

Understanding the Interactions between Soft Segments in Polyurethanes: Structural Synergies in Blends of Polyester and Polycarbonate Diol Polyols

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