Polyurethane elastomers through multi-hydrogen-bonded association of dendritic structures

Chen, Chih‐Ping; Dai, Shenghong A.; Chang, Huey-Ling; Su, Wu‐Chung; Wu, Tzong‐Ming; Jeng, Ru‐Jong

doi:10.1016/j.polymer.2005.06.127

Cited by 77 publications

(55 citation statements)

References 31 publications

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“…The functional silica surface and the PS-co-DVB coating, the as-prepared surface-modified silica microspheres, and the corresponding silica@PS-co-DVB composites were characterized by infrared spectroscopy (Figure 1c). The absorption peak centered at 1 645 cm À1 (curve i) is assigned to the characteristic peak of hydrogen-bonded urethane carbonyl groups, [8] which confirms M1 is grafted onto the silica surface successfully. The characteristic peaks of polystyrene at 1 600 and 1 450 cm…”

Section: Resultsmentioning

confidence: 76%

Encapsulation of a Single Metal Nanoparticle with Tunable Size in a Monodisperse Polymer Microcapsule

Kim

2009

Macromol. Rapid Commun.

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A versatile approach to fabricate monodisperse poly[styrene-co-(divinyl benzene)] (PS-co-DVB) microcapsules that contain a single gold nanoparticle (AuNP) has been demonstrated. Using the PS-co-DVB microcapsule as a microreactor, aqueous HAuCl(4) and NaBH(4) solutions are subsequently infiltrated. The size of the resulting AuNP inside of the PS-co-DVB microcapsules is easily tunable by controlling the repeated infiltration cycles of aqueous HAuCl(4) and NaBH(4) . PS-co-DVB microcapsules that contain a single silver and palladium nanoparticle are also obtained by following a similar protocol.

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Section: Resultsmentioning

confidence: 76%

Encapsulation of a Single Metal Nanoparticle with Tunable Size in a Monodisperse Polymer Microcapsule

Kim

2009

Macromol. Rapid Commun.

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“…In previous investigations, 20,21 we have used analogous systems featuring malonamide and urea groups to prepare supermolecules stabilized through hydrogen bonding. The malonamide linkages generated from the ring-opening reactions of the azetidine-2,4-diones with the NH or OH groups of DDM, TPA, and BE188 are strongly hydrogen-bonding sites that determine the extent of physical crosslinking within the epoxy resins.…”

Section: Thermodynamic Properties Of the Cured Epoxy Resinsmentioning

confidence: 99%

“…19 We suspect that the presence of strong noncovalent interactions, particularly hydrogen bonds, in the novel side-chain and end-capped dendritic polyurethanes significantly improved their mechanical properties, especially with respect to the shape memory effect. 20,21 In this study, we synthesized a doubly functionalized reactive epoxy modifier, bis(azetidine-2, 4-dione), and a triply functionalized phosphoruscontaining reactive epoxy modifier, DOPO-tris(azetidine-2,4-dione), and subsequently incorporated them into systems of diglycidyl ether of bisphenol-A (DGEBA) cured with 4,4 0 -diaminodiphenylmethane (DDM) or tris(4-aminophenyl)amine (TPA). The ring-opening addition reactions of the azetidine-2,4-dione units in the presence of the primary amines enabled the modifiers to act as reactive epoxy curing agents.…”

Section: Introductionmentioning

confidence: 99%

Tailored thermal and mechanical properties of epoxy resins prepared using multiply hydrogen‐bonding reactive modifiers

Liu

Shau

Juang

et al. 2010

J of Applied Polymer Sci

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In this study, we synthesized a phosphoruscontaining triply functionalized reactive modifier, DOPOtris(azetidine-2,4-dione), and a phosphorus-free doubly functionalized reactive modifier, bis(azetidine-2,4-dione), and embedded them into epoxy resin systems. We characterized these synthesized reactive modifiers using Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, elemental analysis, and mass spectrometry. During the thermosetting processes, we reacted the epoxy curing agents 4,4-diaminodiphenylmethane and tris(4-aminophenyl)amine with the multiply hydrogenbonding reactive modifiers and epoxy monomers. The introduction of the DOPO segment, strongly hydrogen bonding malonamide linkages, and hard aromatic groups into the backbones of the synthesized reactive modifiers resulted in epoxy networks exhibiting tailorable crosslinking densities, flexibilities, glass transition temperatures, thermal decomposition temperatures, and flame retardancies. Furthermore, dynamic mechanical analyses indicated that intermolecular hydrogen bonding of these reactive modifiers enhanced the thermal and physical properties of their epoxy resins through the formation of unique pseudocrosslinked polymer networks.

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“…A third weak C¼ ¼O band was observed at about 1640 cm À1 on the untreated TPU and peeled-copper foil (peeled-TPU film did not show this band), which may be assigned to the stretching vibration of hydrogen bonded urea or amide carbonyl. 29 The IR band at 1640 cm À1 was stronger on the peeled-copper foil surfaces, presumably due to the formation of more amide groups by the reaction between carboxylic acid group from 6-aminobenzoic acid and NAH groups from polyurethane at high temperature (190 C). Thus from the ATR-IR analysis, it is proposed that some of the NAH groups of polyurethane are attached to the coupling agent (6-aminohexanoic acid) via hydrogen bonding and other NAH groups form amide linkages.…”

mentioning

confidence: 99%

“…The pure TPU and peeled-TPU films along with the peeled-copper foil showed two C¼ ¼O stretching band at 1725 cm À1 (free) and 1701 cm À1 (hydrogen bonded). 29 The peak at around 1700 cm À1 mainly arising from the hydrogen bonding of NH (urea, amide, or urethane) to carbonyl groups (urethane), whereas free stretching vibration appears at about 1725 cm…”

mentioning

confidence: 99%

Improving interfacial adhesion between thermoplastic polyurethane and copper foil using amino carboxylic acids

Ghosh

Schiraldi

2009

J of Applied Polymer Sci

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A chemical methodology to improve the adhesion between copper foil and a thermoplastic polyurethane (TPU) matrix is reported. The copper foil (0.127 mm thickness) was treated with aminocarboxylic acid‐based coupling agents such as 6‐aminohexanoic acid and 4‐aminobenzoic acid. 3‐Aminopropyl trimethoxysilane was also used as a conventional silane coupling agent for comparative studies. The interfacial adhesion between copper foil and laminated TPU was examined by means of peel adhesion test, scanning electron microscopy, and attenuated total reflection‐infrared spectroscopic methods. The treatment of copper foils with 6‐aminohexanoic acid resulted in improved adhesion, which was equal to that of the silane‐treated system. The mechanism of how the coupling agents strengthen the interfacial adhesion between TPU and copper foil is discussed. The solution concentrations of the coupling agents were optimized with respect to the peel adhesion of the interface. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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Polyurethane elastomers through multi-hydrogen-bonded association of dendritic structures

Cited by 77 publications

References 31 publications

Encapsulation of a Single Metal Nanoparticle with Tunable Size in a Monodisperse Polymer Microcapsule

Encapsulation of a Single Metal Nanoparticle with Tunable Size in a Monodisperse Polymer Microcapsule

Tailored thermal and mechanical properties of epoxy resins prepared using multiply hydrogen‐bonding reactive modifiers

Improving interfacial adhesion between thermoplastic polyurethane and copper foil using amino carboxylic acids

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