Hyperbranched polyester as a crosslinker in polyurethane formation: real-time monitoring using in situ FTIR

Dhevi, D. Manjula; Prabu, Arun Anand; Kim, Kap Jin

doi:10.1007/s00289-016-1629-z

Cited by 17 publications

(10 citation statements)

References 37 publications

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“…The characteristics band features of the mainly functional groups (urethanes and urea linkages), absorbed in the spectral region 1400-1800 cm −1 , are analyzed and discussed and the main deconvoluted peaks are shown in Figure 3. For instance, as widely investigated [10,24,30,31] in the 1600-1800 cm −1 wavenumber region, the carbonyl vibration bands are correlated to the urethane and urea linkages, H-bonded (H-C=O) or free C=O (f -C=O) as summarized in the Table 3. Typically, H-C=O linkages are due to the HS domains present in the polyurethane structure formed between NH groups proton accepting (urethane or urea carbonyl), while the f -C=O linkages can exist dispersed in Soft segment (SS) or in interphase domains (urea phase).…”

Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…The main absorption vibration peaks of polyurethane composite foams (PUG-C, PUG-W and PUG-D) and pristine PUG are listed in Table 3. All the spectra highlight the disappearance of the characteristic NCO vibration peak (around 2270 cm −1 ) associated to the isocyanate consumption inherent to the urethanic linkage formation [10,11,30]. The characteristics band features of the mainly functional groups (urethanes and urea linkages), absorbed in the spectral region 1400-1800 cm −1 , are analyzed and discussed and the main deconvoluted peaks are shown in Figure 3.…”

Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…SAXS analysis has been widely used for studying PU morphology [26][27][28][29][30] because these materials are usually random segmented copolymers of alternating flexible soft-segments (SS) and more rigid hard-segments (HS) containing urethane and/or urea domains. Hence, PUs typically show a microphases-separated morphology where the different electronic densities among SS and HS is responsible of the broad knee scattering feature present in their SAXS patterns.…”

Section: Wide and Small Angle X-ray Scattering (Waxs/saxs) And Optical Polarized Microscopy (Pom)mentioning

confidence: 99%

“…It was hypothesized that, the addition of fillers resulted in the decrease of the isocyanate (NCO) available to react with the polyol (to form HS) due to the reactions that can be occurred between the OH groups of fillers with NCO creating covalent-like bonds to the PU molecular chains. This leads to a decreasing of urethane density (reduction of H-C=O in urethane linkages) and to the formation of new urethane chains (f -C=O) and urea domains (f -C=O) more flexible [30][31][32].…”

Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

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Greener Nanocomposite Polyurethane Foam Based on Sustainable Polyol and Natural Fillers: Investigation of Chemico-Physical and Mechanical Properties

et al. 2020

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Nowadays, the chemical industry is looking for sustainable chemicals to synthesize nanocomposite bio-based polyurethane foams, PUs, with the aim to replace the conventional petrochemical precursors. Some possibilities to increase the environmental sustainability in the synthesis of nanocomposite PUs include the use of chemicals and additives derived from renewable sources (such as vegetable oils or biomass wastes), which comprise increasingly wider base raw materials. Generally, sustainable PUs exhibit chemico-physical, mechanical and functional properties, which are not comparable with those of PUs produced from petrochemical precursors. In order to enhance the performances, as well as the bio-based aspect, the addition in the polyurethane formulation of renewable or natural fillers can be considered. Among these, walnut shells and cellulose are very popular wood-based waste, and due to their chemical composition, carbohydrate, protein and/or fatty acid, can be used as reactive fillers in the synthesis of Pus. Diatomite, as a natural inorganic nanoporous filler, can also be evaluated to improve mechanical and thermal insulation properties of rigid PUs. In this respect, sustainable nanocomposite rigid PU foams are synthesized by using a cardanol-based Mannich polyol, MDI (Methylene diphenyl isocyanate) as an isocyanate source, catalysts and surfactant to regulate the polymerization and blowing reactions, H2O as a sustainable blowing agent and a suitable amount (5 wt%) of ultramilled walnut shell, cellulose and diatomite as filler. The effect of these fillers on the chemico-physical, morphological, mechanical and functional performances on PU foams has been analyzed.

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Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: Wide and Small Angle X-ray Scattering (Waxs/saxs) And Optical Polarized Microscopy (Pom)mentioning

confidence: 99%

Section: Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

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Greener Nanocomposite Polyurethane Foam Based on Sustainable Polyol and Natural Fillers: Investigation of Chemico-Physical and Mechanical Properties

et al. 2020

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“…7 According to those methods, vast HBPs have been prepared such as hyperbranched polyester, hyperbranched polyimide (PI), and hyperbranched polyurethane (HBPU). 8 –10…”

Section: Introductionmentioning

confidence: 99%

Novel hyperbranched poly(urethane–imide)s with enhanced thermal, mechanical, and UV-shielding properties

Tian

Xiao

et al. 2018

High Performance Polymers

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A series of novel hyperbranched poly(urethane–imide)s (HBPUIs) was synthesized and derived from as-prepared imide-containing glycol and commercial materials via an A2 + B2 + B3 approach. The chemical and morphological structures of the resulting polymers were evaluated by infrared attenuated total reflection and X-ray diffraction techniques, respectively. Compared with pure HBPU, HBPUIs exhibited better thermal stability with the 10% weight loss temperature of 282–298°C under nitrogen atmosphere, good mechanical property with the tensile strength of 2–19 MPa, and elongation at breaks of 461–896%. Moreover, optical transmissivity of all films was measured and the results showed that they had excellent transparency in the scope of visible light. Meanwhile, the cutoff wavelengths of as-prepared HBPUI films were at around 350 nm, which can block the whole ultraviolet (UV)-C (200–280 nm) and UV-B (280–320 nm), as well as a part of UV-A (320–400 nm). Furthermore, the designed photocatalytic degradation experiment of the methylene blue (MB) confirmed that HBPUI films had good UV-shielding performance with 70% degradation of MB after intense UV irradiation (400 W) for 50 min under the protection of HBPUI film with 14% imide-containing glycol. This endowed HBPUIs with potential applications prospect in UV-shielding materials.

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Use of Different Temperature Control Techniques Coupled withFTIRSpectroscopy to Simultaneously Induce and Identify the Physical Properties, Chemical Reactions, and Thermal Degradation of Polymers

Lin

Chen

Cheng

2022

Thermal Analysis of Polymeric Materials

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Hyperbranched polyester as a crosslinker in polyurethane formation: real-time monitoring using in situ FTIR

Cited by 17 publications

References 37 publications

Greener Nanocomposite Polyurethane Foam Based on Sustainable Polyol and Natural Fillers: Investigation of Chemico-Physical and Mechanical Properties

Greener Nanocomposite Polyurethane Foam Based on Sustainable Polyol and Natural Fillers: Investigation of Chemico-Physical and Mechanical Properties

Novel hyperbranched poly(urethane–imide)s with enhanced thermal, mechanical, and UV-shielding properties

Use of Different Temperature Control Techniques Coupled withFTIRSpectroscopy to Simultaneously Induce and Identify the Physical Properties, Chemical Reactions, and Thermal Degradation of Polymers

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