Blocked polyisocyanates containing fluorine atoms as crosslinking agents for polyurethane powder coatings

Pilch‐Pitera, Barbara

doi:10.1002/app.35198

Cited by 18 publications

(14 citation statements)

References 17 publications

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“…After immersion, PVA film was rinsed with DMF sufficiently to remove the unreacted HAPI. Compared with spectrum of pure PVA film which stretching vibration peak of hydroxyl groups presented at 3340 cm 21 [ Fig. 2(a) 32 Both of them confirmed the reaction between HAPI and PVA at room temperature.…”

Section: Structural Characterization Of the Lbl Assembly Filmssupporting

confidence: 78%

“…instruments, room temperature to 1000 C, air flow of 100 mL min 21 , and heating rate of 5 C min 21 ).…”

Section: Full Papermentioning

confidence: 99%

“…Polyisocyanate contains repeated isocyanate groups in its chains and has been widely used in the production of polyurethanes. [19][20][21] Meanwhile, it is normally applied in the field of paints, hydrogels and adhesives. [22][23][24] Owning to the high reactivity of -NCO groups, polyisocyanate can react with -OH or -NH 2 group-containing materials at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ren

Guo

et al. 2015

J Polym Sci B Polym Phys

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The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied to fabricate a wide range of materials. LBL materials could improve optical transmittance and mechanical properties if the film components were covalently bonded. Covalently bonded nanocomposite multilayer films were prepared by employing hydrophilic aliphatic polyisocyanate (HAPI) as the reactive component, to react with Laponite and polyvinyl alcohol (PVA). FT-IR spectra suggested that HAPI reacted with Laponite and PVA at ambient temperature rapidly. Ellipsometry measurement showed that the film thickness was in linear growth. The influences of HAPI on the optical, mechanical and thermal properties of the films were investigated by UV-Vis spectroscopy, tensile stress measurement, DSC and TGA. The obtained results showed that the optical transmittance and mechanical strength were enhanced when the film components were covalently bonded by HAPI. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000 KEYWORDS: covalently bonded; layer-by-layer; nanocomposites; self-assembly; thin films INTRODUCTION The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied in the fabrication of nanodevice, drug release, and biomimetic materials.1-4 LBL multilayer films are more versatile in many aspects than bulk materials because they have more precisely controlled composition and structure at nanoscale dimensions. 5 Many researchers have investigated freestanding LBL films.6-8 However, the LBL ultrathin film breaks or decomposes easily during the application, which is one of the main shortages that hampers the application of the materials.9 Covalent assembly is an effective strategy for improving the physical or chemical properties of the LBL films.10-12 Another approach is achieved by introducing inorganic materials such as Laponite, montmorillonite and carbon nanotube into the LBL multilayer films. [13][14][15][16] Researchers have employed hydrogen bond, dipolar bond, or electrostatic attraction between polymer and inorganic particles to fabricate nanocomposite LBL multilayer films. 17,18 This type of physical interaction, however, often leads to unstable multilayer films in strong acid, strong alkali or high humidity conditions.

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Section: Structural Characterization Of the Lbl Assembly Filmssupporting

confidence: 78%

“…instruments, room temperature to 1000 C, air flow of 100 mL min 21 , and heating rate of 5 C min 21 ).…”

Section: Full Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ren

Guo

et al. 2015

J Polym Sci B Polym Phys

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“…FT-NMR data implies the characteristic feature of the ionomer products [22,23]. NMR spectra of polyurethane samples were recorded using DMSO-d6 as a solvent for the PUI samples formulated from the list of diisocyanate reagents analysed to study the composition of materials.…”

Section: Ft-nmr Datamentioning

confidence: 99%

“…All these PUI samples could potentially exhibit bioadhesive property. Mw values of all these products were obtained with wide variation [23] from each other according to the rate of reactivity of diisocyante reagents (TDI>MDI>HDI>IPDI>H12MDI). The polydispersity (Ð) values observed in Table 2 increases from 1.46 to 4.11 for the samples mentioned in the decreasing rate of diisocyanate reactivity.…”

Section: Gel Permeation Chromatography (Gpc)mentioning

confidence: 99%

Ionic polyurethane materials for enhanced platelets adhesion and biocompatibility

Babu¹

2014

IOSRJPBS

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Synthesis of fluoroalkyl‐modified polyester and its application in improving the hydrophobicity and oleophobicity of cured polyester coatings

Xiong

Xia

Shentu

et al. 2013

J of Applied Polymer Sci

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The fluoroalkyl‐modified polyester (PE‐Fn) was synthesized by the reaction of polyester resin (PE) and fluorinated isocyanate, and the structure of the synthesized product was characterized by proton nuclear magnetic resonance (1H‐NMR) and fluorine nuclear magnetic resonance (19F‐NMR). The water and oil wettability of the cured PE coatings with PE‐Fn as additives was investigated by contact angle meter. The results showed that the introduction of an extremely low concentration of PE‐Fn into PE led to the increase in contact angle of water and diiodomethane on cured PE coatings, and the decrease in the surface free energy. The X‐ray photoelectron spectroscopic (XPS) analysis showed that the F/C molar ratio in the outer few nanometers was significantly higher than that in the bulk, indicating that the fluoroalkyl groups in PE‐Fn had enriched on the coating surface. It was also found that longer fluoroalkyl groups and fluoroalkyl groups with CF3 at its end had the higher tendency to aggregate on the coating surface. The topological structures of the cured coatings were recorded by an atomic force microscope under tapping mode and the results revealed that there was a strong surface segregation of fluorinated species. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39812.

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Blocked polyisocyanates containing fluorine atoms as crosslinking agents for polyurethane powder coatings

Cited by 18 publications

References 17 publications

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ionic polyurethane materials for enhanced platelets adhesion and biocompatibility

Synthesis of fluoroalkyl‐modified polyester and its application in improving the hydrophobicity and oleophobicity of cured polyester coatings

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