A comparison of non-isocyanate and HDI-based poly(ether urethane): Structure and properties

Shen, Ziyun; Zheng, Liuchun; Li, Chuncheng; Liu, Guoming; Wu, Shaohua; Liu, Jiajian; Zhang, Bo

doi:10.1016/j.polymer.2019.05.010

Cited by 41 publications

(37 citation statements)

References 46 publications

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“…The substitution of carcinogenic, mutagenic and reprotoxic (CMR) compounds, the reduction of VOC emissions and the study of novel properties, provided eco-friendly alternatives which are described in this part. 140 These NIPUs can be formed by different approaches, such as transurethanization, [141][142][143] ring opening polymerization, 144,145 or various rearrangements, 146 but the most promising route seems the polyaddition between diamines and cyclic carbonates, 147 including biobased resources. 148 Poly(alkyd-urethane) synthetized from DFF showed better hardness, adhesion and chemical resistance than those formed with CHDA.…”

Section: Further Perspectives On Sustainable Alkyd Hybridsmentioning

confidence: 99%

Hybrid alkyds, the glowing route to reach cutting-edge properties?

Chardon

Denis

Négrell

et al. 2021

Progress in Organic Coatings

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This review highlights both the various polymers grafted to alkyd resins reported in the literature and the different routes to synthesize these alkyd hybrids. Alkyd resins were discovered in the mid-1920s. Then, they quickly found a prominent place among coatings and paint binders thanks to their numerous advantages such as good heat resistance, excellent gloss, and low cost. Nevertheless, in the 50s, the emergence of new synthetic polymers with better properties (chemical resistance, mechanical and thermal properties) such as epoxy, acrylic or polyurethane, weakened the position of the alkyd resins among coating industry. Nowadays, due to global issues such as health and environmental concerns, research focuses on biobased polymers. Since, alkyd resins are mainly biobased, they have gained increasing attention in the last decade. Nevertheless, the issue of using volatile organic compounds (VOC) and the urge of replacing them, have led to the development of new synthetic routes. Moreover, in order to enhance alkyd properties and bridge the gap with new materials, other polymers such as epoxy, acrylates, polyurethanes or siloxanes were used to form alkyd hybrids. Hence, the different strategies to perform alkyd hybrids are detailed and discussed in this review. Furthermore, composites made with alkyd hybrid matrix are presented. Finally, the perspectives about the future developments of alkyd hybrids and the most promising hybrids are discussed.

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Section: Further Perspectives On Sustainable Alkyd Hybridsmentioning

confidence: 99%

Hybrid alkyds, the glowing route to reach cutting-edge properties?

Chardon

Denis

Négrell

et al. 2021

Progress in Organic Coatings

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“…Shen et al [ 48 ] and Li et al [ 49 ] have proposed a simple procedure for determining the mass fraction of the hard and soft segments, and the degree of micro-mixing of the hard and soft phases in the polyurethanes. This procedure was used in this study to verify the changes of the micro-mixing of the hard and soft phases in the TPUs made with mixed polyester and polyether SS.…”

Section: Resultsmentioning

confidence: 99%

Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives

Fuensanta

Martı́n-Martı́nez

2021

Polymers

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Thermoplastic polyurethanes (TPUs) were synthetized with blends of poly(propylene glycol) (PPG) and poly(1,4-butylene adipate) (PAd) polyols, diphenylmethane-4,4′-diisocyanate (MDI) and 1,4-butanediol (BD) chain extender; different NCO/OH ratios were used. The structure and viscoelastic properties of the TPUs were assessed by infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, thermal gravimetric analysis and plate-plate rheology, and their pressure sensitive adhesion properties were assessed by probe tack and 180° peel tests. The incompatibility of the PPG and PAd soft segments and the segregation of the hard and soft segments determined the phase separation and the viscoelastic properties of the TPUs. On the other hand, the increase of the NCO/OH ratio improved the miscibility of the PPG and PAd soft segments and decreased the extent of phase separation. The temperatures of the cool crystallization and melting were lower and their enthalpies were higher in the TPU made with NCO/OH ratio of 1.20. The moduli of the TPUs increased by increasing the NCO/OH ratio, and the tack was higher by decreasing the NCO/OH ratio. In general, a good agreement between the predicted and experimental tack and 180° peel strength values was obtained, and the TPUs synthesized with PPG+PAd soft segments had potential application as pressure sensitive adhesives (PSAs).

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“…The DSC thermogram of PU‐1.5 proves this statement at which alongside the low ordering structures, most of the structure have the high ordering level formed at 87°C (showed by green arrow). Although the addition of GQD nanoparticles has improved ordering of hard segments, it was not large enough to enable the hard segments to crystallize which has been accomplished by annealing thermal programing by other authors 27 …”

Section: Resultsmentioning

confidence: 99%

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Nejad

Babaie

Bagheri

et al. 2020

Polymers for Advanced Techs

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A group of shape memory polyurethane‐based nanocomposites containing graphene quantum dot nanoparticles (GQDs) were prepared via in‐situ polymerization method. GQD nanoparticles were synthesized by a facile and rapid microwave‐assisted method and characterized by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction pattern, field emission scanning microscopy, transmission electron microscopy, and fluorescence analysis. Chemical structure and hydrogen bonding index (HBI[C=O]) of the nanocomposites were analyzed via FTIR spectra. The results show that the incorporation of GQDs in PU matrix reduces HBI(C=O) of nanocomposites. Crystalline structure and thermal properties of the nanocomposites were investigated by differential scanning calorimetry. As results indicate, nucleation effect of GQDs raises crystallinity content of the samples. Mechanical examinations indicate that incorporation of GQDs improves Young's modulus of the nanocomposites, while their elongation at break values are reduced. In addition, shape memory analyses reveal that the presence of GQDs in PU matrix increases the shape fixity ratios in nanocomposites.

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A comparison of non-isocyanate and HDI-based poly(ether urethane): Structure and properties

Cited by 41 publications

References 46 publications

Hybrid alkyds, the glowing route to reach cutting-edge properties?

Hybrid alkyds, the glowing route to reach cutting-edge properties?

Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

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