Study on the synthesis of new blocked polyisocyanates as crosslinking agents for hydrophobic polyurethane powder clear coatings

Pilch‐Pitera, Barbara; Byczyński, Łukasz; Myśliwiec, Bogdan

doi:10.1016/j.porgcoat.2017.08.011

Cited by 18 publications

(7 citation statements)

References 22 publications

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“…The symmetrical bending vibration and strong absorption of CH appear at 2937 and 1670 cm −1 , respectively, because of the tensile vibration of surface OH and CO in the GO. The absorption peak at 1543 cm −1 comes from amide or carbamate, corresponding to the coupling of CHN deformation vibration [34]. The infrared spectrum contains absorption peaks related to Tri‐HDI groups, indicating that chemical reaction, not just absorption or intercalation, occurred between GO and Tri‐HDI.…”

Section: Resultsmentioning

confidence: 99%

“…The symmetrical bending vibration and strong absorption of C H appear at 2937 and 1670 cm À1 , respectively, because of the tensile vibration of surface OH and C O in the GO. The absorption peak at 1543 cm À1 comes from amide or carbamate, corresponding to the coupling of CHN deformation vibration [34] carbon-nitrogen stretching vibration and the CHN deformation vibration. The CHN group weakened the hydrogen bonds between adjacent layers in the GO, and thus the GO flakes were peeled off in polar aprotic solvents.…”

Section: Functional Group Structurementioning

confidence: 99%

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Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

Zhang

Wang

et al. 2023

J Chinese Chemical Soc

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ObjectiveA novel fluorescent composite anti‐corrosion coating was prepared, which could simultaneously indicate corrosion sites and corrosion degree according to change of fluorescence intensity.MethodsTri‐HDI/GO/SR/AP coating was prepared by blending method. Its structure, physical properties, anti‐corrosion ability and fluorescence intensity were analyzed.ResultsTri‐HDI/GO/SR/AP coating was not significantly damaged during the corrosion simulation experiment. The fluorescence intensity of the coating decreased with the increase of corrosion degree.ConclusionsBased on structure characterization and electrochemical analysis, it is found that Tri‐HDI/GO/SR/AP coating has positive anti‐corrosion performance. Fluorescence molecules undergo a quenching reaction when corrosion occurs, the corrosion location and corrosion degree can be determined according to the changes of luminescence intensity.

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Section: Resultsmentioning

confidence: 99%

Section: Functional Group Structurementioning

confidence: 99%

Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

Zhang

Wang

et al. 2023

J Chinese Chemical Soc

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“…In step 2, the sample shows a thermal weight loss of 36.14%, and the DSC curve exhibits an obvious endothermic peak (P1). Since the unblocking temperature of the CPL-blocked -NCO group is generally between 130-250°C, the mass and energy change of step 2 is mainly caused by the unblocking of the C 3 IPTS terminal group [38,44,45]. In other words, the CPL of C 3 IPTS is released at this stage, and the -NCO group is exposed.…”

Section: Characterization and Mechanical Testingmentioning

confidence: 99%

A simple method to enhance the interface properties of carbon fibre/polyamide 6 composites: Grafted caprolactam-blocked 3-isocyanatopropyltriethoxysilane on carbon fibre surface

Sun

Zhu

Cai

et al. 2023

Preprint

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Introducing the isocyanate group on the carbon fibre (CF) to improve surface activity is an effective modification method. Still, its application in the industrial field is restricted because the modification process is harmful to the environment and isocyanate is easy to fail. In this paper, 3-isocyanopropyltriethoxysilane (IPTS) has been blocked with caprolactam (CPL) have been prepared. By adjusting the hydrolysis conditions and concentration of the modified coupling agent solution, the CPL-blocked IPTS was grafted to the surface oxidized CF, and the CF-reinforced polyamide 6 (PA6) composites were prepared. After treating CF with 1.0wt% coupling agent solution, the composites’ interlaminar shear strength (ILSS) reached 52.53 MPa, which was 23.83% greater than that of the desized CF/PA6 composites. High-temperature composite molding caused CPL-blocked IPTS to unblock, and the isocyanate that was released thermally intereacted with the terminal amino group of PA6 to establish a high strength interface through covalent grafting, which was the main reason for improving ILSS. This study indicates that this method is safe and simple and can effectively improve the interface properties of CF/PA6 composites.

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“…53 This is additional evidence of the catalytic effect of calcein during polymerization. From the NMR spectra of PUs before degradation (Figure 3A(i,ii),B(i,ii)), there were no characteristic peaks attributed to biurets in the 1 H NMR spectra (9.1 and 9.4 ppm 54 ), and no characteristic peaks attributed to allophanates in the 13 C NMR spectra (156 ppm 55 ), indicating that these two byproducts were not produced during the synthesis process. The detailed assignment of peaks in NMR spectra can be found in the Supporting Information.…”

Section: 2mentioning

confidence: 99%

Biodegradable Polyurethane Scaffolds in Regeneration Therapy: Characterization and In Vivo Real-Time Degradation Monitoring by Grafted Fluorescent Tracer

Lei,

Yang,

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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There is an urgent need to assess material degradation in situ and in real time for their promising application in regeneration therapy. However, traditional monitoring methods in vitro cannot always profile the complicated behavior in vivo. This study designed and synthesized a new biodegradable polyurethane (PU-P) scaffold with polycaprolactone glycol, isophorone diisocyanate, and L-lysine ethyl ester dihydrochloride. To monitor the degradation process of PU-P, calcein was introduced into the backbone (PU-5) as a chromophore tracing in different sites of the body and undegradable fluorescent scaffold (CPU-5) as the control group. Both PU-P and PU-5 can be enzymatically degraded, and the degradation products are molecularly small and biosafe. Meanwhile, by virtue of calcein anchoring with urethane, polymer chains of PU-5 have maintained the conformational stability and extended the system conjugation, raising a structure-induced emission effect that successfully achieved a significant enhancement in the fluorescence intensity better than pristine calcein. Evidently, unlike the weak fluorescent response of CPU-5, PU-5 and its degradation can be clearly imaged and monitored in real time after implantation in the subcutaneous tissue of nude mice. Meanwhile, the in situ osteogeneration has also been promoted after the two degradable scaffolds have been implanted in the rabbit femoral condyles and degraded with time. To sum up, the strategy of underpinning tracers into degradable polymer chains provides a possible and effective way for real-time monitoring of the degradation process of implants in vivo.

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Study on the synthesis of new blocked polyisocyanates as crosslinking agents for hydrophobic polyurethane powder clear coatings

Cited by 18 publications

References 22 publications

Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

A simple method to enhance the interface properties of carbon fibre/polyamide 6 composites: Grafted caprolactam-blocked 3-isocyanatopropyltriethoxysilane on carbon fibre surface

Biodegradable Polyurethane Scaffolds in Regeneration Therapy: Characterization and In Vivo Real-Time Degradation Monitoring by Grafted Fluorescent Tracer

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