Smart secondary polyurethane dispersions

Chen, Fei; Hehl, Judith; Su, Yu; Mattheis, Claudia; Greiner, Andreas; Agarwal, Seema

doi:10.1002/pi.4481

Cited by 9 publications

(11 citation statements)

References 38 publications

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“…The absorption of ester carbonyl becomes less prominent and that of urethane carbonyl becomes more prominent with increasing the IS content. The characteristic stretching vibration of C-O-C in ether group was observed at 1100 cm −1 for all CIPUs [40,41]. The results indicated that the polyurethane containing IS unit was successfully synthesized.…”

Section: Preparation and Characterization Of The Polyurethanesmentioning

confidence: 77%

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

Chen

et al. 2018

Sci. China Mater.

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Sustainable polyurethanes prepared from castor oil and diisocyanates show very low strength and toughness, due to the highly cross-linked and flexible structure. Herein, we report a new strategy to simultaneously reinforce and toughen castor oil-based polyurethane via incorporating a stiff component (isosorbide, IS) to enhance network stiffness and reduce crosslink density. The crosslinking degree decreases while the strength, moduli, ductility and heat resistance significantly increase accordingly with increasing IS content. The tensile behaviors are tunable over a broad range (either as elastomers or as plastics) depending on the compositions. The polyurethanes show excellent thermal stability with onset decomposition temperature higher than 280°C. The investigation provides a new hint for future design and fabrication of high performance sustainable polymers from other vegetable oils.

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Section: Preparation and Characterization Of The Polyurethanesmentioning

confidence: 77%

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

Chen

et al. 2018

Sci. China Mater.

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“…Expanding upon the aforementioned synthetic strategies, there are two popular approaches to incorporate ionic sites into polyurethanes, i.e., using preformed charged monomers or a post-polymerization modifi cation reaction such as alkylation. [ 25,26 ] In either route, the ionic content will reside in either the HS or SS at varying levels simply depending on the monomer(s) chosen and desired amounts. [ 27 ] The effect of charge placement and content on polymer properties is discussed in detail in later sections of this review.…”

Section: Synthesis Of Ion-containing Segmented Polyurethanesmentioning

confidence: 99%

“…[ 1 ] Ionic groups facilitate water-compatibility and are easily incorporated through deprotonation, alkylation, or a preformed charged monomer; most PUDs are ioncontaining segmented systems. [ 1,25,36,55,65,67 ] The diversity of potential ionic groups is identical to the traditional ion-containing segmented polyurethanes as summarized in the previous section. The fl uorescent PUD described above is classifi ed as an anionic PUD due to the carboxylic acid-containing starting monomer.…”

Section: Ion-containing Biobased Polyols and Waterborne Polyurethane mentioning

confidence: 99%

“…The biocompatible nature of ion-containing segmented polyurethanes stimulates abundant research aimed at various biomedical applications including biodegradable scaffolds, antimicrobicides, blood compatibilizers, and their potential use in drug delivery systems. [ 25,31,53,55,70,[86][87][88][89] Biodegradability is an important feature when designing scaffolds as their function is to aid in regeneration, not remain as permanent replacements. [ 90 ] A common route to biodegradable segmented polyurethanes is the use of a biodegradable polyol, such as PCL, in the SS.…”

Section: Applications Of Ion-containing Segmented Polyurethanesmentioning

confidence: 99%

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Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Nelson

Long

2014

Macro Chemistry & Physics

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Despite the well-established foundation of polyurethane chemistry in both industry and academia, research continues at a vigorous pace to refi ne synthetic processes and discover new functional materials. Incorporating ionic groups into polymers is a synthetic parameter capable of tailoring polymer properties and enabling emerging technologies. This review focuses on recent effort in the fi eld of ion-containing segmented polyurethane copolymers. Multiple synthetic strategies to incorporate both cationic and anionic sites, including a particular focus on waterborne polyurethane dispersions and green synthetic methods, are examined. Fundamental structure-property relationships based on ionic structure, content, and placement are explored and many applications, including biomedical products and polymer electrolytes for energy devices are discussed.(PEG) or poly(tetramethylene oxide) (PTMO), to the polyurethane reaction. The hydrogen bonding, depicted in Figure 1 , between the urethane carbonyl oxygen and urethane hydrogen, coupled with crystallization, constructs the hard segment (HS) domains, while the functionalized fl exible spacers comprise the soft segments (SSs) in an alternating fashion. The microphase-separated morphology of segmented polyurethanes is the foundation for their versatility, with the ability to further tune materials for a specifi c application with other synthetic parameters such as chemical composition and molecular weight. Yilgör and co-workers, [ 5 ] Yurtsever and co-workers, [ 6 ] and Wilkes and co-workers [ 7 ] extensively studied various model segmented polyurethane systems to further understand the morphology and factors infl uencing morphology on a fundamental structure-property level.Many comprehensive reviews and peer-reviewed journal articles focus on fundamental structure-property relationships of segmented polyurethanes.

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“…However, the growing awareness of the importance to reduce the emission of volatile organic components (VOC) has forced many researchers to devote a main part of their work to develop environmentally friendly product [6][7][8][9]. Therefore, the eco-friendly waterborne polyurethane dispersions (PUDs) have received increased attention as important alternatives to their solvent-based counterparts [6,[10][11][12][13][14][15][16][17]. The basic components used to build up PUDs are polyol, diisocyanate, internal emulsifier, chain extender and neutralizing agent.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane/aromatic polyamide sulfone copolymer dispersions from transesterified castor oil

et al. 2016

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Four polyurethane/polyamide copolymer dispersions (PUCON-co-APAS) were prepared from castor oil-based polyol (CON). Castor oil (CO) was firstly transesterified with triethanolamine at 210°C for different time intervals: 30, 60, 90 and 120 min, to produce CON30, CON60, CON90 and CON120 polyols, respectively. The hydroxyl and acid values, density, viscosity, chemical structure analysis of the CON polyols were determined. The polyols were used to prepare PUCON30-co-APAS, PUCON60-co-APAS, PUCON90-co-APAS, and PUCON120-co-APAS copolymer dispersions in five steps using prepolymer self-emulsification solvent process. The first step is the prepolymer preparation step, in which CON was reacted with dimethylolpropionic acid and excess toluene diisocyanate to produce PUCON NCO . The second step is the copolymerization step, in which PUCON NCO was reacted with amino-terminated aromatic polyamide sulfone. The following processes are neutralization, chain extension and dispersion steps. The prepared copolymer dispersions were characterized using FTIR, DLS, TGA, DSC and GPC. Additionally, the physical, chemical and mechanical properties of the prepared copolymers were studied. The results showed an increase in the hydroxyl number of CON with increasing transesterification time. Stronger H-bonds and smaller particle sizes are produced using CON with higher transesterification time in the preparation of the copolymer dispersions.

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Smart secondary polyurethane dispersions

Cited by 9 publications

References 38 publications

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Polyurethane/aromatic polyamide sulfone copolymer dispersions from transesterified castor oil

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