Journal of Cleaner Production
·
2020
·
IF 7.246
Muhammad Asad Saleem,Liujun Pei,Muhammad Faizan Saleem,Sumaira Shahid,Jiping Wang
Because of the prevailing issue of water scarcity , the application of non-aqueous media Decamethylcyclopentasiloxane (D5) was employed in the chemical fiber dyeing and washing process. Confocal laser scanning microscope (CLSM) and X-ray photoelectron spectroscopy (XPS) analysis have been carried out to analyze the penetration of D5 into the interior of nylon fiber and its distribution in fiber cross-section. The solubility of pure disperse dye in D5 has been measured to check the feasibility of dispersing agent exclusion from dyeing formulation. For developing the solvent dyeing and washing process for nylon, nylon fabric was dyed with pure disperse dyes in D5 solvent and washed with D5 without any process auxiliaries. Findings from CLSM and XPS spectrum showed that D5 can diffuse into the nylon fabric surface with and without the addition of accelerant. And accelerant doesn’t affect D5’s ability to penetrate and uniform distribution within the fiber structure. As compared to aqueous dyeing, the 30 and 43 percent increase in K/S was achieved for azo and anthraquinone dyes by using D5 as dyeing media. Furthermore, more than 99 percent solvent can be recycled or recovered. The level dyeing with commercial dyes under conventional dyeing conditions in D5 solvent dyeing media prove the commercial feasibility of this dyeing technology .
研究领域:
材料科学
·
环境科学
·
染料化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Mohammad Ziaur Rahman,Xin Wang,Lei Song,Yuan Hu
Rising concerns about the toxic effects and environmental issues associated with various fireproof treatments on textiles have led to a demand for “green” materials. Chitosan (CS) is an amino polysaccharide green, recyclable, and non-toxic highly biocompatible biopolymer that consists of multiple hydroxyl groups and has a wide range of applications, including as a flame retardant additive. In this study, an eco-friendly bio-based formaldehyde-free flame retardant containing a higher level of phosphorus and nitrogen in phytic acid ammonia (PAA) was synthesized to amplify the most plentiful green chitosan (CS)-modified polyamide 66 (PA66) fabric surface through a simple pad-dry-cure technique for the improvement of durable flame retardancy with hydrophilicity . The findings revealed that each UV-grafted CS fabric could entirely stop the melt-dripping tendency during the vertical burning (UL-94) test and reached a V -1 rating. Meanwhile, limiting oxygen index (LOI) testing showed a rapid increase from 18.5 % to 24 % for the PA66 control and the PAA-treated (i.e., PA66-g-5CS-PAA) fabric samples, respectively. Moreover, compared to the PA66 control sample, a dramatic decrease in the peak heat release rate (PHRR), fire growth rate (FGR), and total heat release (THR) by approximately over 52 %, 0.63 %, and 19.7 %, respectively, was observed for the PA66-g-5CS-PAA fabric sample. Additionally, this arrangement of PAA catalyzed the charring of grafted CS and acted as a condensed phase flame retardant, resulting in a significant improvement in char yield% in both air and N 2 atmospheres for the PA66-g-5CS-PAA fabric sample in TGA . In addition, only the lower grafting ratio of CS with PAA-treated fabric sample (i.e., PA66-g-2CS-PAA) could encourage it to gain its lowest water contact angle of 0 0 , as well as impersonating a positive effect in improving the flame retardant coating durability in washing and sustaining even after 10 home laundering cycles. This phenomenon suggests that an actual hydrophilic and durable flame retardant finishing procedure for polyamide 66 fabrics might be applied with the novel, plentiful, sustainable, and environmentally friendly bio-based green PAA ingredient.
研究领域:
材料科学
·
纺织工程
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2021
·Vol. 10
·期 10
·2339
·
IF 4.35
Zhichao Yang,Chaoyi Shen,Yucheng Zou,Di Wu,Hui Zhang,Kunsong Chen
Gelatin (GA) is a natural protein widely used in food packaging, but its fabricated fibrous film has the defects of a high tendency to swell and inferior mechanical properties. In this work, a novel spinning technique, solution blow spinning (SBS), was used for the rapid fabrication of nanofiber materials; meanwhile, nylon 66 (PA66) was used to improve the mechanical properties and the ability to resist dissolution of gelatin films. Morphology observations show that GA/PA66 composite films had nano-diameter from 172.3 to 322.1 nm. Fourier transform infrared spectroscopy and X-ray indicate that GA and PA66 had strong interaction by hydrogen bonding. Mechanical tests show the elongation at break of the composite film increased substantially from 7.98% to 30.36%, and the tensile strength of the composite film increased from 0.03 MPa up to 1.42 MPa, which indicate that the composite films had the highest mechanical strength. Water vapor permeability analysis shows lower water vapor permeability of 9.93 g mm/m2h kPa, indicates that GA/PA66 film’s water vapor barrier performance was improved. Solvent resistance analysis indicates that PA66 could effectively improve the ability of GA to resist dissolution. This work indicates that SBS has great promise for rapid preparation of nanofibrous film for food packaging, and PA66 can be applied to the modification of gelatin film.Keywords:solution blow spinning;gelatin;nylon 66;modification;rapid fabrication
研究领域:
材料科学
·
纳米技术
·
食品包装
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2013
·Vol. 35
·期 4
·627-635
·
IF 1.482
Lei Xia,Baoqing Shentu,Zhixue Weng
The effect of dendrimer-like polyamidoamine grafted attapulgite (ATP-PAMAM) on the microstructure and morphology of Nylon-6 (PA6) was investigated. The ATP-PAMAM nanoparticles were prepared by treating attapulgite (ATP) with heat and acid followed by grafting with polyamidoamine (PAMAM) molecules, which was confirmed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and dispersion state in formic acid. The X-ray diffraction (XRD) analysis result indicated that the grafting modification was occurred on the surface of fibrous crystals and did not shift the crystal structure of ATP. PA6/ATP-PAMAM (G 2.0 ) nanocomposites with different modified ATP content were prepared by melt compounding in a twin screw extruder. XRD measurements suggested that the intensity of diffraction peak of α crystalline form of PA6 decreased gradually as the inclusion of ATP-PAMAM(G 2.0 ) into the PA6 matrix, while that of γ crystalline form increased gradually. The results of molau experiment and scanning electron microscopy (SEM) observation showed not only a uniform dispersion of ATP-PAMAM(G 2.0 ) in the PA6 matrix but also a strong interfacial adhesion between them. Mechanical investigation (by tensile test) showed an obvious improvement in the presence of surface modified ATP. POLYM. COMPOS., 35:627–635, 2014. © 2013 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 2
·364
·
IF 3.164
Ya Liu,Gaokai Zhang,Xupin Zhuang,Sisi Li,Lei Shi,Weimin Kang,Bowen Cheng,Xianlin Xu
In this work, a nylon 6 nanofibrous membrane was prepared via solution blowing technology and followed hot-press as scaffold for nanofiltration. The structure and properties of the hot-pressed nylon 6 nanofibrous membrane (HNM) were studied the effect of hot-pressing parameters and areal densities. Then an ultra-thin polyamide (PA) active layer was prepared by interfacial polymerization on HNM. The effects of nanofibrous scaffolds on the surface properties of ultra-thin nanofiltration membranes and their filtration performance were studied. Results showed that the nylon 6 nanofibers prepared at a concentration of 15 wt % had a good morphology and diameter distribution and the nanofibers were stacked more tightly and significantly reduced in diameter after hot pressing at 180 °C under the pressure of 15 MPa for 10 s. When the porous scaffold was prepared, HNM with an areal density of 9.4 and 14.1 g/m2has a better apparent structure, a smaller pore size, a higher porosity and a greater strength. At the same time, different areal densities of HNM have an important influence on the preparation and properties of nanofiltration membranes. With the increase of areal density, the uniformity of HNM increased while their surface roughness and pore size decreased, which is beneficial to the establishment of PA barrier layer. With areal density of 9.4 and 14.1 g/m2, the as-prepared nanofiltration membrane has a smoother surface and more outstanding filtration performance. The pure water flux is 13.1 L m−2h−1and the filtration efficiencies for NaCl and Na2SO4are 81.3% and 85.1%, respectively.Keywords:solution blowing;nylon 6 nanofibrous membrane;scaffold;nanofiltration
研究领域:
材料科学
·
纳米技术
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengmin Hou,Ying Zhang,Qianqian Liao,Qianruo Chen
A novel adsorbent material, nylon@Fe 3 O 4 , was prepared by co-precipitation of nylon and FeSO 4 /FeCl 3 /NaOH solution. The structure of the composite was characterized using FTIR and TG methods. The results of FTIR and TG indicated that nylon@Fe 3 O 4 was successfully synthesized. The adsorption effect of nylon@Fe 3 O 4 on Cu(II) was explored under different experimental conditions. The optimum adsorption conditions of nylon@Fe 3 O 4 on Cu(II) were reached when the amount of composite was 12.50 mg, the concentration of Cu(II) was 15.36 mg/L, the reaction temperature was 50 °C, and the pH value was 9. Under the above conditions, the optimum adsorption efficiency was 94.67 % and the optimum adsorption capacity was 11.57 mg/g. The kinetic modeling indicated that the adsorption of nylon@Fe 3 O 4 belonged to chemisorption, and the initial adsorption rate (h = 69.92 mg/g/min) was larger, which indicated that the nylon@Fe 3 O 4 adsorption rate was faster. The adsorption isotherm experiments showed that the nylon@Fe 3 O 4 adsorption process occurred in the monomolecular layer adsorption, and the separation coefficients 0 < R L = 0.322/0.300/0.287 < 1, which indicated that the adsorption process of nylon@Fe 3 O 4 for Cu(II) was favorable adsorption. The adsorption thermodynamics showed that Δ G 0 < 0, Δ S 0 = 118 J/mol/K > 0, and Δ H 0 = 31.14 kJ/mol > 0, indicating that the adsorption process of nylon@Fe 3 O 4 on Cu(II) was spontaneous and favorable adsorption. Through 8 cycle experiments, the adsorption efficiency decreased from 94.67 % to 61.55 %, so nylon@Fe 3 O 4 had good regenerative performance. In conclusion, nylon@Fe 3 O 4 has potential applications in the adsorption of heavy metal ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Yijian Wu,Hui Zhang,Baoqing Shentu,Zhixue Weng
Organo-montmorillonite (OMMT) was introduced into SEBS-g-MA toughened poly(phenylene oxide)/polyamide-6 (PPO/PA6) blends simply by melt extrusion. The effects of OMMT on morphology, rheology, and mechanical behaviors of toughened PPO/PA6 nanocomposites were studied by scanning electron microscope, transmission electron microscope, capillary rheometer and mechanical tests. The addition of OMMT could decrease the size of dispersed PPO domains in PA6 matrix and melt viscosity of the toughened PPO/PA6 nanocomposites. Besides, exfoliated OMMT also brought significant improvement of tensile properties and heat deflection temperature (HDT), simultaneously. For nanocomposites with exfoliated OMMT, OMMT induced more core–shell toughening particles with the optimized size, and thus, elastomer-OMMT synergistic toughening was achieved in the PPO/PA6 nanocomposites. Consequently, PPO/PA6 nanocomposites with high tensile strength, excellent impact performance, improved HDT, and good processability were obtained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Tao Zhang,Yue Xu,Hongfu Li,Boming Zhang
In this study, the effect of carbon fiber (CF) surface chemistry and grafting of nano-SiO 2 on CF surface with respect to the interfacial adhesion of CF-reinforced nylon 6 composites was investigated. CFs were oxidized and reacted with poly(oxypropylene) diamines to modify the surface chemistry. The oxidized CFs were modified with 3-aminopropyltriethoxysilane and then grafted with SiO 2 nanoparticles. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microcopy (SEM), and atomic force microscopy (AFM) were used to characterize the chemistry and topographies of the CF surface. The transverse fiber bundle strength of CF oxidized and grafted nano-SiO 2 increased to 31.92 MPa and 39.35 MPa, respectively, from 12.57 MPa for untreated CF. The results indicated that the reaction between the carboxyl group and nylon 6 led to chemical bonding at the interface and it meanwhile was strengthened and toughened by uniformly distributed SiO 2 nanoparticles on the CF surface.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 12
·3261-3270
·
IF 2.153
Liu Kainan,Cao Liqin
Nylon mesh has been applied in various fields because of its intrinsic mechanical and chemical stability. However, its application is limited by its surface property. In this work, nylon mesh was first designed to integrate with a zeolitic imidazolate framework-67 (ZIF-67) with a distinct hydrophobic property. Herein, the mechanically stable nylon mesh/carboxymethyl chitosan/ZIF-67 (NY/CMCS/ZIF-67) composite membranes were prepared via layer-by-layer self-assembly of CMCS surface functional groups to coordinate with cobalt ion and in situ growth of ZIF-67. The prepared NY/CMCS/ZIF-67 membranes were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. After modifications, the ZIF-67 content in the membranes reached 22 %. The water contact angle increased from 47.5 ° for nylon mesh to 128.8 ° for NY/CMCS/ZIF-67. The NY/CMCS/ZIF-67 composite membranes exhibited good oil-water emulsion separation property and oil absorption ability. After 15 oil absorption-drying cycle experiments, the oil absorption ability of the membrane was still greater than 95 %, and the oil absorption rate was 6.8 g/g. The modified nylon mesh could still be used for dye removal, the adsorption capacity of the membrane increased by 50 % compared with that of NY/CMCS, and the adsorption processes followed the pseudo-second-order model. Thus, this research provides new insights into the preparation of efficient modified nylon film with great application potential for filtration and separation in complex environments.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Kai-di Cui,Bei-xing Li,Xue-ping Huang,Lei-ming He,Da-xia Zhang,Wei Mu,Feng Liu
Sustained-release profile is an important component in the quality control of microcapsules. In the current study, we propose a reliable, convenient, and versatile strategy to assess the controlled-release performance of MCs under artificial, simulated conditions. Dissolution tests were performed using an experimental device equipped with syringe filters. The optimum experimental conditions utilized 80% v/v methanol (3 ml) as a release medium at each sampling point, Nylon 6 filters (13 mm diameter, 0.22 μm pore size) as diffusion barriers, and a sampling regime based on predetermined changed intervals. Validation tests demonstrated that this strategy possessed favorable universality for three wall materials (polyurea, polyurethane and urea-formaldehyde) and three core materials (phoxim, pyraclostrobin and clomazone), as all sampling points had standard errors below 3.4%. Our proposed method also showed apparent advantages in experimental precision and the demand for a release medium compared with dynamic dialysis.
研究领域:
药剂学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2014
·Vol. 14
·期 11
·21453-21465
·
IF 2.048
Zengyuan Pang,Jiapeng Fu,Pengfei Lv,Fenglin Huang,Qufu Wei
Camphor sulfonic acid (CSA)-doped polyamide 6/polyaniline (PA6/PANI) composite nanofibers were fabricated usingin situpolymerization of aniline under different CSA concentrations (0.02, 0.04, 0.06, 0.08 and 0.10 M) with electrospun PA6 nanofibers as templates. The structural, morphological and ammonia sensing properties of the prepared composite nanofibers were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), four-point probe techniques, X-ray diffraction (XRD) and a home-made gas sensing test system. All the results indicated that the CSA concentration had a great influence on the sensing properties of CSA-doped PA6/PANI composite nanofibers. The composite nanofibers doped with 0.02 M CSA showed the best ammonia sensing properties, with a significant sensitivity toward ammonia (NH3) at room temperature, superior to that of the composite nanofibers doped with 0.04–0.10 mol/L CSA. It was found that for high concentrations of CSA, the number of PANI–H+reacted with NH3would not make up a high proportion of all PANI–H+within certain limits. As a result, within a certain range even though higher CSA-doped PA6/PANI nanofibers had better conductivity, their ammonia sensing performance would degrade.Keywords:polyaniline;camphor sulfonic acid;polyamide 6;ammonia;gas sensor
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shuai Tang,Lujian Lin,Xuesong Wang,Anqi Yu,Xuan Sun
In water environments, nylon microplastics (MPs) and heavy metals are two kinds of common pollutants. This study investigated the adsorption of three divalent metals (Cu(II), Ni(II), Zn(II)) onto collected nylon MPs as function of contact time, temperature, solution pH, ionic strength and concentration of fulvic acid (FA). The kinetic data fitted well with the Elovich and pseudo-second order equations. The result of shrinking core model (SCM) confirms that the adsorption of Cu(II) and Zn(II) was mainly controlled by intraparticle diffusion. The adsorption of three metal ions onto collected nylon MPs is spontaneous, endothermic, with an increased randomness in nature. The Langmuir and Freundlich models successfully described the adsorption isotherms. The speciation distributions of three divalent metals in aqueous solutions were identified to analyze the effects of initial solution pH, ionic strength and fulvic acid concentrations on the adsorption amounts. X-ray photoelectron spectroscopy (XPS) analysis indicates the importance of surface O-containing groups of collected nylon MPs in controlling the adsorption of three metal ions. This research provides a clear theoretical basis for the behavior of nylon MPs as heavy metals (Cu(II), Ni(II), Zn(II)) carrier and highlights their environmental toxicity, which deserves to be further concerned.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）