Synthesis and characterization of flame retardant hyperbranched polyurethanes for nano-composite and nano-coating applications

Patel, Rasmika H.; Patel, Krishna Kumar

doi:10.1016/j.porgcoat.2015.07.007

Cited by 31 publications

(11 citation statements)

References 18 publications

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“…Hence, the tendency to form aggregates is higher with increasing the Cu nanoparticle size in the TPU matrix. On the other hand, the incorporation of copper nanoparticles could promote the interconnection of hard elements forming paths, producing a change in the distribution of the compound which translates into an increase in the toughness of the material [ 38 , 39 ]. Copper-polyurethane composites prepared with nanoparticles were found to be more resistant, with an increase of TS of 23% and flexible materials (>70% of EB), than neat TPU ( Table 4 ).…”

Section: Resultsmentioning

confidence: 99%

Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

et al. 2020

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In this work, thermoplastic polyurethane (TPU) composites incorporated with 1.0 wt% Cu particles were synthesized by the melt blending method. The effect of the incorporated copper particle size on the antibacterial, thermal, rheological, and mechanical properties of TPU was investigated. The obtained results showed that (i) the addition of copper particles increased the thermal and mechanical properties because they acted as co-stabilizers of polyurethane (PU) (ii) copper nanoparticles decreased the viscosity of composite melts, and (iii) microparticles > 0.5 µm had a tendency to easily increase the maximum torque and formation of agglomerates. SEM micrographics showed that a good mixture between TPU and copper particles was obtained by the extrusion process. Additionally, copper-TPU composite materials effectively inhibited the growth of the Gram-negative Escherichia coli and the Gram-positive Staphylococcus aureus. Considering that the natural concentration of copper in the blood is in the range of 0.7–0.12 mg/L and that the total migration value of copper particles from TPU was 1000 times lower, the results suggested that TPU nanocomposites could be adequately employed for biomedical applications without a risk of contamination.

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Section: Resultsmentioning

confidence: 99%

Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

et al. 2020

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“…To investigate how the star-shaped cross-linker affects the polymer performance, we fixed the feeding ratio of the PPG to HDI with 1:2 for the purpose to get the prepolymer with ending isocyanate groups. Prepolymers with ending isocyanate groups were reported to exhibit good coating property [9,29], also they were used to provide active groups to crosslink with ACP (one aniline group can react with two isocyanate groups) here. No other crosslinkers were added to FSPUs to simplify the study.…”

Section: Thermal Behavior Analysismentioning

confidence: 99%

Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane

Song

Liu

et al. 2020

Polymers

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Star-shaped cyclophosphazene (ACP) was employed as covalent crosslinker to form a rigid segment in polyurethanes network, to enhance the mechanical performance and to add extra flame retardant property. The effects of different ACP contents on the shape memory ability and fire resistance performance of polyurethane (PU) were studied. Tensile tests suggested high flexibility of the PUs with the maximum elongation-at-break of 161.59%. Dynamic mechanical analysis (DMA) indicated good shape recovery ratio of 72.58% after more than three repeated cycles. Under thermal treatment, the temporary shape could recover to its original state in 10 s. The peak heat release rate (pHRR), total heat released (THR) and temperature at pHRR (Tp) of flame-retardant shape memory polyurethane (FSPU) by micro-combustion calorimeter (MCC) was as low as 183.2 W/g, 21.4 KJ/g, 330.8 °C respectively, suggesting good inherent fire-resistant performance. As amine-containing crosslinkers are one of the most common building units in thermosetting polymers, we anticipate that our finding will have significant benefits beyond shape memory and fire-resistance.

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“…Only the foam produced from PEG200 at an isocyanate index of 90 indicated the presence of unreacted NCO at this wave number. KL, LS and PEG200 (isocyanate indexes of 270 to 360) foams additionally displayed NCO vibrating peaks at 2160 cm -1 as identified by reference [14]. The presence of free-NCO peaks indicated that the diisocyanate did not completely react with polyol during the synthesis process [12].…”

Section: Ftir Spectramentioning

confidence: 99%

The effect of Isocyanate Index on Polyurethane scaffolds for the Immobilization of Mycobacterium Tuberculosis DNA

2015

7th International Conference on Latest Trends in Engineering and Technology (ICLTET'2015) Nov. 26-27, 2015 Irene, Pretoria (Sou

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The Pre-clinical Drug Development Platform (PCDDP) based at the NorthWest University (NWU) developed a novel diagnostic method for detecting Mycobacterium Tuberculosis (MTB). The Polymerase chain reaction (PCR) test involves the extraction of MTB DNA from clinical samples onto a scaffold in order to be transferred to a lysis microreactor (LMR) for identification. The polyurethane (PU) scaffolds previously made through the polyaddition of diphenylmethane diisocyanate (MDI) and a polyethylene glycol (PEG) polyol showed potential for deoxyribonucleic acid (DNA) immobilization applications. In this study the effect of isocyanate index on the ability of synthesized PU scaffolds to improve DNA capture was investigated. This paper further investigates the possibility of using liquefied kraft lignin (KL) and lignosulfonate (LS) as alternative renewable polyols to replace PEG in the synthesis of the scaffolds. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), compression strength and DNA amplification tests were performed on the synthesized scaffolds. Polyurethane foams (PUF) of good rigidity and strength, that could be easily handled and withstand the chemical buffer, temperatures and mechanical stresses in the LMR without disintegrating, was produced. DNA capture tests yielded promising results as scaffolds produced at an isocyanate index of 150 showed positive potential for the capture of non-infectious MTB.

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Synthesis and characterization of flame retardant hyperbranched polyurethanes for nano-composite and nano-coating applications

Cited by 31 publications

References 18 publications

Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

Star-Shaped Crosslinker for Multifunctional Shape Memory Polyurethane

The effect of Isocyanate Index on Polyurethane scaffolds for the Immobilization of Mycobacterium Tuberculosis DNA

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