A novel P/N-based flame retardant synthesized by one-step method toward cotton materials and its flame-retardant mechanism

Abstract Although pyrovatex has been widely utilized as commercial flame-retardant material, the discharge of poisonous formaldehyde is still a major concern. On the other side, fluorine-based materials have been successfully used to impart superhydrophobic textile surfaces, but they are highly expensive and extremely toxic. Based on these challenging concerns, we report a simple one-step method for the production of flame-retardant and water-repellent coating onto an electroconductive cotton-nickel (Cot-Ni) blend fabric. Firstly, the electroconductive cotton was prepared by weaving nickel strip twisted around cotton core yarns, which were then weaved with pure cotton yarns to introduce Cot-Ni blend fabric. Secondly a composite comprising ammonium polyphosphate (APP) and room-temperature vulcanized silicone rubber (RTV) was applied onto the electroconductive cotton fabrics via one-step pad-dry-cure technique. Results showed that the flame-retardant effect of cotton was enhanced due to the high binding of RTV with both APP and cotton fibers. Thus, different concentrations of APP were implemented in the composite to establish that only 100 g/L of APP with RTV presented an improved fire-retardancy. The surface of Cot-Ni fabric displayed different hierarchical morphologies relying on the concentration of APP. Moreover, RTV further enhanced the superhydrphobic nature of cotton surface. Importantly, the superhydrophobic activity was characterized by static water contact angle of the coated Cot-Ni blend. The CIE Lab colorimetric measurements of the coated Cot-Ni blend were also explored. The comfort characteristics of the coated Cot-Ni blend were assessed by measuring their air permeability and stiffness. Ultimately, these multifunctional cotton-nickel (Cot-Ni)/RTV-APP treated fabrics could be suitable for diverse applications, including firefighters’ wear, car seat mats, and grain storage containers.

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Flame-Retardant and Smoke Suppression Properties of Nano MgAl-LDH Coating on Bamboo Prepared by an In Situ Reaction

Journal of Nanomaterials ◽

10.1155/2019/9067510 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 2

Author(s):

Xiaoling Yao ◽

Chungui Du ◽

Yating Hua ◽

Jingjing Zhang ◽

Rui Peng ◽

...

Keyword(s):

Reaction Time ◽

Flame Retardant ◽

Building Materials ◽

Reaction Times ◽

Step Method ◽

In Situ Reaction ◽

One Step ◽

Double Hydroxide ◽

Optimal Reaction

In recent years, bamboo has been widely used for building materials and household goods. However, bamboo is flammable, so a flame-retardant treatment for bamboo is urgently needed. In this work, nano MgAl-layered double hydroxide (MgAl-LDH) coated on bamboo, which was called MgAl-LB, was synthesized by an in situ one-step method. To determine the optimal in situ time, the effects of different reaction times on LDH growth on the bamboo surface and the flame retardancy of the MgAl-LBs were investigated. The SEM observations show that LDH growth on the surface of bamboo was basically saturated when the in situ reaction time was 24 h. Abrasion experiments show that MgAl-LDH coating has good abrasion resistance. The fire performance of the MgAl-LBs was evaluated by cone calorimeter tests, which indicated that the THR and TSP of the MgAl-LBs were significantly lower than those of untreated bamboo. Taking into account the energy consumption problem, determining the reaction time of 24 h is the optimal reaction time. Compared with untreated bamboo, the THR and TSP of MgAl-LB prepared at 24 h decreased by 33.3% and 88.9%, respectively.

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Effect of Dynamic Crosslinking on Mechanical Properties of PP/EPDM Blends

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19932642 ◽

1993 ◽

Vol 58 (11) ◽

pp. 2642-2650 ◽

Cited By ~ 10

Author(s):

Zdeněk Kruliš ◽

Ivan Fortelný ◽

Josef Kovář

Keyword(s):

Mechanical Properties ◽

Impact Strength ◽

Shear Modulus ◽

High Impact ◽

Necessary Condition ◽

Step Method ◽

Melt Mixing ◽

One Step ◽

High Impact Strength ◽

Dynamic Curing

The effect of dynamic curing of PP/EPDM blends with sulfur and thiuram disulfide systems on their mechanical properties was studied. The results were interpreted using the knowledge of the formation of phase structure in the blends during their melt mixing. It was shown, that a sufficiently slow curing reaction is necessary if a high impact strength is to be obtained. Only in such case, a fine and homogeneous dispersion of elastomer can be formed, which is the necessary condition for high impact strength of the blend. Using an inhibitor of curing in the system and a one-step method of dynamic curing leads to an increase in impact strength of blends. From the comparison of shear modulus and impact strength values, it follows that, at the stiffness, the dynamically cured blends have higher impact strength than the uncured ones.

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Bismuth particles imbedded degradable nanohydrogel prepared by one-step method for tumor dual-mode imaging and chemo-photothermal combined therapy

Chemical Engineering Journal ◽

10.1016/j.cej.2019.122000 ◽

2019 ◽

Vol 375 ◽

pp. 122000 ◽

Cited By ~ 4

Author(s):

Yang Xuan ◽

Xian-Lin Song ◽

Xiao-Quan Yang ◽

Ruo-Yun Zhang ◽

Zi-Yu Song ◽

...

Keyword(s):

Combined Therapy ◽

Dual Mode ◽

Step Method ◽

One Step

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Bio-Based Polyurethane Networks Derived from Liquefied Sawdust

Materials ◽

10.3390/ma14113138 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3138

Author(s):

Kamila Gosz ◽

Agnieszka Tercjak ◽

Adam Olszewski ◽

Józef Haponiuk ◽

Łukasz Piszczyk

Keyword(s):

Biomass Conversion ◽

Structural Features ◽

Mechanical Analysis ◽

Process Efficiency ◽

Hydroxyl Number ◽

Step Method ◽

One Step ◽

Liquefaction Process ◽

The Fourier Transform ◽

Liquefaction Temperature

The utilization of forestry waste resources in the production of polyurethane resins is a promising green alternative to the use of unsustainable resources. Liquefaction of wood-based biomass gives polyols with properties depending on the reagents used. In this article, the liquefaction of forestry wastes, including sawdust, in solvents such as glycerol and polyethylene glycol was investigated. The liquefaction process was carried out at temperatures of 120, 150, and 170 °C. The resulting bio-polyols were analyzed for process efficiency, hydroxyl number, water content, viscosity, and structural features using the Fourier transform infrared spectroscopy (FTIR). The optimum liquefaction temperature was 150 °C and the time of 6 h. Comprehensive analysis of polyol properties shows high biomass conversion and hydroxyl number in the range of 238–815 mg KOH/g. This may indicate that bio-polyols may be used as a potential substitute for petrochemical polyols. During polyurethane synthesis, materials with more than 80 wt% of bio-polyol were obtained. The materials were obtained by a one-step method by hot-pressing for 15 min at 100 °C and a pressure of 5 MPa with an NCO:OH ratio of 1:1 and 1.2:1. Dynamical-mechanical analysis (DMA) showed a high modulus of elasticity in the range of 62–839 MPa which depends on the reaction conditions.

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Analysis and applicability of a new quartic polynomial one-step method for solving COVID-19 model

Journal of Physics Conference Series ◽

10.1088/1742-6596/1734/1/012019 ◽

2021 ◽

Vol 1734 ◽

pp. 012019

Author(s):

S E Fadugba ◽

V J Shaalini ◽

A A Ibrahim

Keyword(s):

Step Method ◽

Quartic Polynomial ◽

One Step

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Discussion on Repair Method of Concrete Highway Pavement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.209 ◽

2013 ◽

Vol 321-324 ◽

pp. 209-212

Author(s):

Chun Yan Xia

Keyword(s):

Mechanical Properties ◽

Preparation Program ◽

Step Method ◽

Concrete Technology ◽

Concrete Material ◽

Repair Method ◽

Ordinary Concrete ◽

One Step ◽

Highway Pavement

nfluences on properties of the concrete highway pavement were analyzed in this paper, and the optimal formulation materials were gotten to use in the repair of used-broken cement blocks in the experiment. Polyurethane concrete material was prepared, combing the ordinary concrete technology with one-step method of the synthesis of polyurethane hard bubble, and then its mechanical properties of the relevant parameters were measured to determine the optimal preparation program. The results show that the polyurethane concrete also has sufficiently good mechanical properties while it has the characteristic of fast patching.

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