Synthesis and characterization of novel organosilicon‐modified polyurethane

Zhang, Yihe; Shang, Jiwu; Lv, Fengzhu; Chu, Paul K.

doi:10.1002/app.36245

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…DTA experiments agree well with the TGA thermograms. There were two exothermic peaks at about 400 and 480 °C, likely associated with the decomposition process of hard segments (i.e., isocyanate + chain extender) and soft segments (i.e., polyol) …”

Section: Results and Discussionmentioning

confidence: 99%

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Environmentally Friendly Slow-Release Urea Fertilizers Based on Waste Frying Oil for Sustained Nutrient Release

Liu

Yang

Gao

et al. 2017

ACS Sustainable Chem. Eng.

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Novel biobased polyurethane (PU) was synthesized by using waste frying oil-based polyol (WFOP) and isocyanate for slow-release fertilizers (SRFs). Epoxy resin (EP) was used to modify PU to synthesize the interpenetrating network (IPN) for improving the properties of the coating film. Nine polymer-coated nitrogen (N) fertilizers were prepared from these composite coating materials. The N release characteristics of the PU-coated urea (PCU) in water and soil were determined. Degradation behavior of coatings in the soil was evaluated. Results showed that 20% EP in the coating increased the cross-linking density by 77.9%, reduced the coating porosity by 28%, and thus slowed the nutrient release from the PCU significantly. Because of its compact structure, the water absorption rate of the EP-modified PCU shell was slower than that of the unmodified ones. All the PCUs, especially the EP-modified ones, showed excellent slow N release behaviors. In addition, the biopolymers derived from waste frying oil also displayed good biodegradability in the soil environment. Findings from this work indicated that the slow release and environmentally friendly PCUs have great potential for applications in horticulture and agriculture.

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Section: Results and Discussionmentioning

confidence: 99%

“…There were two exothermic peaks at about 400 and 480 °C, likely associated with the decomposition process of hard segments (i.e., isocyanate + chain extender) and soft segments (i.e., polyol). 33 Porosity and Degree of Cross-Linking. Coating porosity measurements showed that E44 had a great influence on porosity (Figure 8).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Environmentally Friendly Slow-Release Urea Fertilizers Based on Waste Frying Oil for Sustained Nutrient Release

Liu

Yang

Gao

et al. 2017

ACS Sustainable Chem. Eng.

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“…53,55,56 The absorption band around 3320 cm À1 indicated the N-H group in urethane. 57,58 The peaks at 2940 and 2854 cm À1 were asymmetric and symmetric vibrations of the -CH 2 group. 59 The peaks at 1530 and 1220 cm À1 were assigned to amide (-C-N-) in urethane (-NHCOO-).…”

Section: Results and Discussion Ftir Resultsmentioning

confidence: 99%

Morphology, mechanical properties, and shape memory effects of poly(lactic acid)/ thermoplastic polyurethane blend scaffolds prepared by thermally induced phase separation

Jing

Salick

et al. 2014

Journal of Cellular Plastics

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Novel blended scaffolds combining biobased polylactic acid (PLA) and thermoplastic polyurethane (TPU) were fabricated by thermally induced phase separation (TIPS) using two different solvents. Pure PLA and TPU polymer scaffolds using 1,4-dioxane as the sole solvent exhibited typical ladder-like structures, while blended PLA/TPU scaffolds using the same solvent showed a more uniform microstructure. When de-ionized water was added to the solution as a non-solvent, scaffolds with the mixed solvent showed more open cells and greater interconnectivity. In compression tests, it was found that specimens, including pure PLA, TPU, and blended scaffolds with the mixed solvent, showed a higher compressive modulus than their counterparts that used dioxane as the single solvent. Dynamic mechanical analysis (DMA) was employed to characterize the shape memory properties of the scaffolds. DMA indicated that the shape fixing ratio was highest in the PLA scaffolds, while the shape recovery ratio of the TPU scaffolds was the greatest among the specimens. More interestingly, when the mixed solvent was used, the shape memory property of the blended scaffolds displayed a similar deformation curve to the TPU scaffold. This was due to the presence of the TPU phase and similarity in structure between PLA/TPU and TPU scaffolds when mixed solvent was used. In the degradation test, the blended scaffolds showed a balanced degradation behavior in-between the more easily degraded PLA and the more stable TPU in the phosphate-buffered saline (PBS), and the addition of water to the systems accelerated the degradation process of the specimens. Cell culture results showed that all of the scaffolds had good biocompatibility.

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“…The surface SEM images of PUA and SPUA films are shown in Figure 3 . The PUA ( Figure 2 a) film shows a typical microphase separation morphology, in which many protrusions of hard-segment domains have dispersed in the soft segments [ 44 ]. Incorporation of only 5 wt % MI or MII into PUA could significantly decrease the microphase separation ( Figure 3 B,F), evidenced by the fact that only a little bit of agglomerations could be observed (inset).…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Tris(trimethylsiloxy)silyl Modified Polyurethane Acrylates and Their Application in Textile Treatment

Xiong

et al. 2020

Polymers

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Three series of silicone modified polyurethane acrylate (SPUA) prepolymers were prepared from dicyclohexylmethane-4, 4′-diisocyanate (HMDI), PPG1000, triethylene glycol (TEG), 2-hydroxyethyl acrylate (HEA), and multi-hydroxyalkyl silicone (MI-III) with tris(trimethylsiloxy)silyl propyl side groups. Their structures were confirmed by 1H NMR, 13C NMR, and Fourier transformed infrared (FTIR) analysis, and SPUA films were obtained by UV curing. The properties of films were investigated by attenuated total reflection (ATR)-FTIR, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), water contact angle (WCA), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), water and hexane resistance, and tensile testing. The results showed that the structures and dosages of MI-III could influence the polymerization properties, surface properties, water and n-hexane resistance, and thermal and tensile properties of SPUA. For instance, the surface aggregation of tris(trimethylsiloxy)silyl propyl groups (even ~2.5 wt%) could endow SPUA films with less microphase separation, good hydrophobicity, lipophilicity, thermal stability, and mechanical properties. Interestingly, obvious regular winkles appeared on the surfaces of SPUAIII films, which are characterized by relatively high WCA values. However, relatively smooth were observed on the surfaces of SPUAIII films, which also exhibit lower water absorption ratio values. Furthermore, the ordinary cotton textiles would be transformed into hydrophobic and oleophilic textiles after treating with SPUA simply, and they were used in the oil/water separation study. Among them, consistent with water and hexane resistance analysis of SPUA films, SPUAII treated cotton textiles are characterized by relatively small liquid absorption capacity (LAC) values. Thus, phenyl groups and side-chain tris(trimethylsiloxy)silyl propyl groups are helpful to improve the hydrophobicity and lipophilicity of SPUA films. SPUAII-5 (even with 5 wt% MII) treated cotton textiles could efficiently separate the oil/water mixture, such as n-hexane, cyclohexane, or methylbenzene with water. Thus, this material has great potential in the application of hydrophobic treatment, oil/water separation, and industrial sewage emissions, among others.

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Synthesis and characterization of novel organosilicon‐modified polyurethane

Cited by 17 publications

References 21 publications

Environmentally Friendly Slow-Release Urea Fertilizers Based on Waste Frying Oil for Sustained Nutrient Release

Environmentally Friendly Slow-Release Urea Fertilizers Based on Waste Frying Oil for Sustained Nutrient Release

Morphology, mechanical properties, and shape memory effects of poly(lactic acid)/ thermoplastic polyurethane blend scaffolds prepared by thermally induced phase separation

Preparation and Characterization of Tris(trimethylsiloxy)silyl Modified Polyurethane Acrylates and Their Application in Textile Treatment

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