The IR spectra and hydrogen bonding of toluene-2,6-bis(methyl) and 4,4′-diphenylmethane-bis(methyl) carbamates

Furer, V.L.

doi:10.1016/s0022-2860(99)00321-x

Cited by 29 publications

(13 citation statements)

References 5 publications

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“…Figure (a–c) present the FTIR spectra obtained from pure PU, PU/APP (16.7 mass % additive), and PU/MHAPP (16.7 mass % additive) heated at different temperature in muffle. Pure PU shows peaks at 1720 (C=O vibration), 1307 (C–N stretching vibration), 1404 (CH 2 bending vibration), and 1093 (CH 2 –CH 2 stretching vibration) cm −1 , and the typical absorptions of benzene ring skeleton are detected at 1600, 1527, 825, and 781 cm −1 , which are consistent with the absorptions of PU reported . It could be seen that the peaks of typical absorptions of benzene ring skeleton and C=O vibration absorptions decrease as temperature increasing.…”

Section: Resultssupporting

confidence: 86%

Reactive flame retardant with core‐shell structure and its flame retardancy in rigid polyurethane foam

Luo

et al. 2015

J of Applied Polymer Sci

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With a shell of poly (methyl methacrylate-co-hydroxyl ethyl acrylate) (PMMA-HA), microencapsulated ammonium polyphosphate (MHAPP) is prepared by in situ polymerization. The core-shell structure of the reactive flame retardant (FR) is characterized by Fourier transform infrared (FTIR) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). The results of water leaching rate and water contact angle measurements show that ammonium polyphosphate (APP) is well coated by a hydrophobic shell. Due to the presence of active groups (-OH) and hydrophobic groups (-CH 3 ) in shell, MHAPP exhibits better compatibility, flame retardancy, and water resistance compared with neat ammonium polyphosphate (APP) in rigid polyurethane foam (PU). Compression strength of PU/MHAPP with suitable loading is higher than that of PU/APP and PU, the reason is that the active groups in shell can improve the compatibility of MHAPP in PU composite. From thermal stability and residue analysis, it can be seen that the presence of reactive flame retardant shows positive effect on thermal stability of PU composite at high temperature, results also indicate that MHAPP can promote the carbonization formation efficiency of PU composite during combustion process compared with APP.

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Section: Resultssupporting

confidence: 86%

Reactive flame retardant with core‐shell structure and its flame retardancy in rigid polyurethane foam

Luo

et al. 2015

J of Applied Polymer Sci

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“…The presence of hydrogen bonds in PUs can be highlighted by FTIR spectroscopy, [25][26][27][28][29][30][31] that also allows the identification of the main functional groups present in their molecular structure. In Figure 7 and 8 the FT IR spectra of the original polycarbonate and polyester based PUs are shown; in Table 4 the main peaks assignments related to the principal bands are summarised.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

On The Micro‐Phase Separation in Waterborne Polyurethanes

Princi

Vicini

Castro

et al. 2009

Macro Chemistry & Physics

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Some polyester and polycarbonate‐based waterborne polyurethanes (WPU) were characterised by means of several techniques, to correlate the morphology with their structures and properties. The morphological analysis carried out by transmission electron microscopy on thin sections showed that the selected polyurethanes, after purification, exhibit a nanostructured phase separation between hard and soft domains. The presence of hydrogen bonding and the hard/soft ratio were evaluated by FT IR and NMR spectroscopy. Both the thermal and the dynamic mechanical analysis allowed the polymers microstructure to be correlated with the polymer properties; two glass transition temperatures were determined, corresponding to the hard and soft domains respectively.magnified image

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“…No IR absorptions corresponding to isocyanate groups of NCO at 2268 cm −1 were found in the IR spectra of either sample; this indicated that the chemical reaction of NCO with OH was completed . Sundararajan's team provided insight into the crystallization self‐assembly of biscarbamate materials and found that their crystallization morphologies were created by the hydrogen bonding between NH and CO groups and van der Waals interactions of alkyl chains. As reported, the same IR absorptions corresponding to the hydrogen‐bonded NH and CO groups at about 3318 and 1682 cm −1 and the CH 2 symmetric (ν s ) and asymmetric (ν as ) peaks at 2847 and 2916 cm −1 were found in the IR spectra of BC‐16, as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Thermoreversible rheological responses of biscarbamates and tricarbamates in uncured epoxy composite pastes caused by their self‐assembly in an epoxy matrix

Zhang

Chen

2017

J of Applied Polymer Sci

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We investigated the rheological behaviors of diglycidyl ether of bisphenol A (epoxy resin) composite pastes with fumed SiO 2 , biscarbamates, and tricarbamates with the same terminal alkyl chains of C 16 , respectively. The rheological measurement results show that the rheological responses of both carbamates in the epoxy composite pastes were stronger than that of fumed silica at the same concentrations, especially at low concentrations, and the rheological behaviors of the epoxy composites with them were thermally reversible and concentration dependent. IR, thermal, differential scanning calorimetry, and polarized microscopic analyses demonstrated that their different excellent rheological responses in epoxy composite pastes came from their different self-assemblies in the epoxy matrix, which were caused by the different intermolecular interactions, mainly including hydrogen-bonding and van de Waals interactions, and the intermolecular interactions for carbamates were closely related to their molecular structures. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46032.

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The IR spectra and hydrogen bonding of toluene-2,6-bis(methyl) and 4,4′-diphenylmethane-bis(methyl) carbamates

Cited by 29 publications

References 5 publications

Reactive flame retardant with core‐shell structure and its flame retardancy in rigid polyurethane foam

Reactive flame retardant with core‐shell structure and its flame retardancy in rigid polyurethane foam

On The Micro‐Phase Separation in Waterborne Polyurethanes

Thermoreversible rheological responses of biscarbamates and tricarbamates in uncured epoxy composite pastes caused by their self‐assembly in an epoxy matrix

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