Preparation of Modified Titanate Nanotubes and Its Application in Polyurethane Nanocomposites

Monteiro, Wesley F.; Santos, Cláudia A.B. dos; Einloft, Sandra; Oberson, M.; Carone, Carlos Leonardo Pandolfo; Ligabue, Rosane Angélica

doi:10.1002/masy.201500146

Cited by 15 publications

(16 citation statements)

References 14 publications

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“…2). These results are in agreement with those found by Monteiro et al 22 . Figures 3 shows the diffraction pattern obtained of TiO 2 precursor (anatase phase) and the characteristics peaks are situated at 2θ= 25° (101), 38° (004), 48° (200), 53° (106) and 62° (215) in agreement with the assignments described in literature 26,27 .…”

Section: Titanate Nanotubes (Tnt)supporting

confidence: 94%

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

et al. 2017

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The final destination of PET packaging is creating economic and environmental concerns. One of the alternatives to minimize this problem would be making use of chemical recycling of this material through glycolysis with the aim to produce bis(hydroxiethyl) terephthalate, BHET monomer. This reaction is well known, but it still presents problems as BHET purity since it makes necessary the development of new catalysts highly selective. In this context, the present work studied the catalytic activity of a nanostructured material, titanate nanotubes (TNT), and compared it to a commercial catalyst (zinc acetate), which is the most used for this glycolysis reaction according to literature researches, and analyzed the influence of PET type (virgin and post-consumer) in the depolymerization for reaction times of 2, 3 and 4 hours. Using TNT as catalyst, BHET production yield and values of turnover number for the evaluated reaction times were higher than the results using Zn(OAc) 2 for virgin PET, proving itself as a promising catalyst.

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Section: Titanate Nanotubes (Tnt)supporting

confidence: 94%

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

et al. 2017

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“…It is possible to observe that the nanotubes are formed by winding at least three titanates multilayer lamellar walls and have an external diameter of 8.3 ± 0.9 nm (NaTNT) and 8.7 ± 0.6 nm (ZnTNT). These results are in agreement with those found by Monteiro et al…”

Section: Resultssupporting

confidence: 94%

Titanate Nanotubes Modified With Zinc and Its Application in Post‐Consumer PET Depolymerization

Lima

Monteiro

Toledo

et al. 2019

Macromolecular Symposia

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The development of nanostructures has received notoriety due to the properties that the nanometric scale provides to the material. Among these properties, the increase in the catalytic activity due to the high specific surface area of nanostructures has been the focus of several studies. Among the nanometric catalysts that have been studied, titanate nanotubes present versatility of applications since they can be modified through the functionalization or ion exchange adding the structure metals that increase the catalytic efficiency. For the depolymerization of post‐consumer polyethylene terephthalate (PET) bottles by glycolysis, a chemical recycling method that is in accordance with the principles of sustainable development, which aims to obtain the bis(2‐hydroxyethyl) terephthalate (BHET) monomer, sodium titanate nanotubes (NaTNT) and zinc titanate nanotubes (ZnTNT) were used as catalysts. The nanostructures were efficient in the PET depolymerization reaction for 2, 3, and 4 h, converting PET into BHET with yield higher than 65% (w/w).

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“…Pure PU and PU nanocomposites (modified TNTs) were synthesized according to the literature , using a 500 mL glass reactor with five inputs, coupled to a mechanical stirrer, thermocouple (temperature control), reflux system, and an addition funnel. Pure PU was obtained by reacting PCL with H at a 1:1 molar ratio in 100 mL of MEK under inert atmosphere (N 2 ), at 40°C for 2.5 h. DBTDL was used as the catalyst (0.1 wt% in relation to the total weight of reactants).…”

Section: Methodsmentioning

confidence: 99%

Modified titanate nanotubes for the production of novel aliphatic polyurethane nanocomposites

et al. 2018

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Aliphatic polyurethane (PU) nanocomposites were prepared using modified titanate nanotubes (TNTs) as filler in order to improve the mechanical and thermal properties of the initial polymer. With a view to achieving greater interaction between the polymer chains and TNTs, the latter was functionalized with hexamethylene diisocyanate (H) and/or aminopropyl trimethoxysilane groups (A), producing the modified nanotubes TNTH, TNTA, or TNTHA. The thermogravimetric analyses used to quantify the amount of anchored diisocyanate or/and silanol groups in the nanotubes identified the H function as the best functional group in terms of improving the filler-PU compatibility. Transmission electron microscopy, field emission scanning electron microscopy, and atomic force microscopy analyses of the PU nanocomposites containing the three different fillers showed good TNT dispersion. The TNTHA nanotubes functionalized with both groups through the reaction between the H function already anchored on the TNTs and the A group, forming a monourea anchored group, significantly improved the mechanical and thermal properties of PU nanocomposites. POLYM. COMPOS., 40:2292-2300, 2019.

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Preparation of Modified Titanate Nanotubes and Its Application in Polyurethane Nanocomposites

Cited by 15 publications

References 14 publications

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

Titanate Nanotubes Modified With Zinc and Its Application in Post‐Consumer PET Depolymerization

Modified titanate nanotubes for the production of novel aliphatic polyurethane nanocomposites

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