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
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产品关联
DOI
PubMed
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
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纺织工程
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绿色化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenshuang Ma,Tao Deng,Lingling Ma,Youbing Li,Tian Xia
Plastic-metal hybrid (PMH) provides a new direction for aerospace and automotive rail transit fields to achieve lightweight. Hot pressing has broad application prospects in plastic/metal hybrids. Before the realization of TC4(Ti-6Al-4V)/PA66(Nylon 66) hybrid by hot pressing, different porous microstructures were prepared on the surface of TC4 by controlling the micro-arc oxidation (MAO) voltage (220 V, 240 V, 260 V, 280 V). Effect of different porous ceramic structures on the hybrid interface. Research shows that the microscopic porous ceramic structure on the surface of TC4 can enhance the surface wettability and wear resistance of TC4. Promote the embedding of PA66 into the TC4 surface to achieve mechanical interlocking. Different microstructures have different effects on bonding strength and failure modes. Especially at 240 V, the interface maximum bonding strength is 11.56 Mpa, and the interface failure mode is a mixed failure caused by plastic cohesion failure and plastic pull-out. In addition, XPS detection generates new chemical bonds, such as Ti-O and -C-Ti-O, at the hybrid interface. Compound reinforcement of mechanical interlocking and chemical bonding is achieved at the interface. In conclusion, these results are crucial for further designing and optimizing plastic-metal hybrids prepared using micro-arc oxidation.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10914-10922
·
IF 3.591
Junyi Guo,Yuxing Ye,Zhongjie Du,Chen Zhang,Wei Zou
Recently, nylon-66 materials have begun to be researched due to their excellent properties. However, their low thermal and electrical conductivities may limit their application. In this study, we report the fabrication of an electrically and thermally conductive composite (GO–PPD/NAAK/PA-66) made with nylon-66 (PA-66) and large-scale graphene oxide loaded with potassium naphthalene acetate (GO–PPD/NAAK) for the first time (GO: graphene oxide; PPD: p-phenylenediamine; NAAK: potassium naphthalene acetate). PPD could overlap the GO sheets and expand the interlayer spacing to form thermally and electrically conductive networks in the PA-66 matrix. Simultaneously, NAAK allows the modified GO to disperse in the PA-66 matrix more uniformly via reducing the crystallinity of PA-66. It was observed that the addition of PPD and NAAK reduced the crystallinity of PA-66, leading to extensive thermally and electrically conductive networks in the PA-66 matrix, as verified using DSC and SEM measurements. Good interfacial compatibility between PA-66 and modified GO could be induced via the formation of hydrogen bonds between them. Conductivity data indicated that, in comparison to neat PA-66, the electrical conductivity of GO–PPD/NAAK/PA-66 increased from 1.41 × 10−14 S cm−1 to 2.52 × 10−4 S cm−1 with 10.0 wt% GO–PPD/NAAK. More importantly, the thermal conductivity increased by about 119% with 10.0 wt% GO–PPD/NAAK.
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
ACS Omega
·
2021
·
IF 3.512
Rui Wang,Weiwen Gu,Ziling Liu,Yunyu Liu,Guocong Ma,Jianfei Wei
Carbonized polymer dots (CPDs) have attracted widespread attention owing to their unique properties and are usually prepared from monomers of polymers or polymers. To reduce the waste of high-value petropolymers and environmental pollution, a simple and green method for the preparation of CPDs using a hydrothermal technique based on the cross-linking enhanced emission effect was proposed, in which nylon 66 waste fibers were used as a precursor and glutaraldehyde as a cross-linking agent. The as-prepared CPDs possessed polymer/carbon hybrid structures with a 3.5 nm average diameter, and hydroxyl (−OH), carboxyl (−COOH), and amino (−NH2) groups were present on the surface of CPDs. It can be found that the as-prepared CPDs display excitation-dependent photoluminescence emission, which is mainly attributed to the molecular state luminescence center. Because the molecular state fluorescence of CPDs could be affected by the presence of Fe3+ and the change of pH values, the as-prepared CPDs can be used as a probe for the detection of the concentration of Fe3+ and the pH variations of solution. The fluorescence intensity of CPDs was selectively quenched by Fe3+ in the range from 1 to 145 μM. In virtue of the static quenching of CPDs by Fe3+, a sensing system was fabricated for the quantitative detection of Fe3+, and its limit of detection was 0.1 μM. Based on the electrostatic doping/charging of CPDs, a pH sensor was fabricated. It showed that the fluorescence intensity of CPDs decreased along with the increase of pH from 2.60 to 12.6. What is more, the CPDs were found to be an alternative to traditional fluorescent inks for encryption and information storage.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Yuming Xie,Yongxian Huang,Xiangchen Meng,Junchen Li,Jian Cao
Lap joints between aluminum and beech ( Fagus longipetiolata ) were obtained via friction stir spot welding with Nylon-66 intermediate layers. The polymer layer was introduced to form sandwich structures, which induced mechanical interlocking through infiltrating into the rough surface and formed chemical bonding via C-O-Al bonds. Wood degradation and residual stress were downgraded due to the buffering of the polymer layer. The maximum tensile shear strength with Φ12 mm circular lap area was 11.2 MPa, indicating that friction stir spot welding with thermoplastic polymer intermediate layers has the potential to join metals and woods with high performances.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Chanchal Kumar Kundu,Xin Wang,Mohammad Ziaur Rahman,Lei Song,Yuan Hu
A DOPO-based phosphorus compound (DOPA) was synthesized and applied onto the pure and chitosan (CS) modified polyamide 66 (PA66) fabric surfaces via a simple pad-dry-cure method to improve the flame retardant properties of the same. The pure and chitosan modified fabric samples treated with DOPA at different content % degraded in a different way as the char residue formation and releasing of volatile and non-volatile gas species were dissimilar which were evident from the thermogravimatric and thermogravimetric-gas chromatography-mass spectroscopy (TG-GC-MS) test analysis. Obtained results also showed that no dripping occurred in the vertical burning test and a sharp increase in limiting oxygen index (LOI) values was noticed for all the treated fabric samples. CS modified PA66 fabric sample treated with a 10 wt % of DOPA exhibited a greater reduction in pHRR by 40% and showed superior flame retardant performance compared to the only DOPA treated pure fabric sample. The superb flame retardant properties of CS modified fabrics were due to the co-presence of DOPA and CS; where a synchronized gas phase and a condensed phase flame retardant mechanism was realized as DOPA showed a quenching effect in a gas phase mechanism and simultaneously, catalyzed the charring of CS in a condensed phase activity which was also justified from the TG-GC-MS analysis, TGA and FTIR analysis of char residues. However, this kind of facile application showed poor wash durability and deteriorated the physical properties of the fabric materials specifically treated with a higher DOPA content.
研究领域:
材料科学
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纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Ruiyin Liu,Zepei Yan,Ming Liu,Hanbing Lu,Xiaoyun Han,Luyao Su,Shugao Zhao,He Wang
Considering the toxicity of traditional resorcinol-formaldehyde-latex (RFL) dipping solution used to prepare fiber- reinforced rubber composites, a novel eco-friendly dopamine (DA)-supported dipping system was developed in this study. Based on the interactions between DA, glycerol triglycidyl ether (GTE), and m -xylylenediamine (MXDA), the dipping solution successfully coated the surface of the nylon-66 (PA66), and the resulting GTE/DA/MXDA/latex-treated PA66 (PA66-GDML) possessed better thermal stability than untreated PA66. The interfacial adhesion between PA66 and neoprene was significantly improved by using the appropriate interfacial layer and the synergistic effect during co-vulcanization. The adhesive strength between PA66-GDML and neoprene was comparable to that obtained in an RFL system, especially when the ratio of GTE/DA/MXDA was 5:1:2. Highlights An eco-friendly dopamine-supported dipping system was developed. The dipping solution (GTE/DA/MXDA) could successfully coat nylon 66 fibers. Treated nylon 66 possessed better thermal stability than untreated nylon 66. The adhesive strength was comparable to that obtained in a RFL system. The new dipping system shows great potential to replace RFL system.
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
Sustainability
·
2022
·Vol. 14
·期 21
·14097
·
IF 3.889
Jiangyi Yan,Lihong Nie,Guiliang Li,Wenxin Wu,Ming Gao,Yuanlu Zhu,Weixing Wu,Beifu Wang
In this paper, we report for the first time the successful formation of a covalent cross-linking structure between polyacrylic acid and polyamide 66 in an electrospun nanofiber membrane by the facilitated amidation reaction using N-Hydroxy-succinimide (NHS) and N-(3-Dimethylaminopropyl)-N’-ethyl-carbodiimide hydrochloride (EDC). The structure and properties of the fiber membrane are characterized using scanning electron microscopy, wide field X-ray diffraction and differential scanning calorimetry. The results show that the presence of the cross-linked structure not only affects the construction of the nanofiber network framework but also influences the pore size distribution and size of the fiber membrane surface, which in turn affects its retention of contaminants and water absorption performance. After modification, the cross-linked membranes exhibited a significant retention performance of up to 77% for methyl tert-butyl ether (MTBE) with a reduced pure water flux. Furthermore, after crosslinking, the fiber membrane has been strongly enhanced with more stable pH response behavior.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Mengyuan Li,Pengfei Li,Yehong Han,Dandan Han,Hongyuan Yan
In this study, a new rapid and inexpensive filter solid-phase extraction method (FSPE) was developed for the extraction and separation of five perfluorinated carboxylic acids (PFCAs) (namely, perfluorooctanoic acid, perfluorononanoic acid, perfluorodecanoic acid, perfluoroundecanoic acid, and perfluorododecanic acid) from milk samples. Commercial nylon 66 syringe filters were used as adsorbents without additional modification. The proposed method could achieve the fast adsorption of analytes by benefitting from the advantages of using the nylon 66 filter membrane on PFCAs with multiple adsorption interactions, namely, hydrophobic interactions and hydrogen bonds. The FSPE was designed to achieve the rapid isolation of analytes based on the rapid solid-liquid separation while using the solid-phase extraction disk. PFCAs residues in milk were extracted by first flowing the samples through a nylon 66 syringe filter from top to bottom. Double contact desorption with methanol was then accomplished by pulling and pushing the syringe, followed by derivatization with acetyl chloride-methanol. Finally, the extracted PFCAs residues were monitored using gas chromatography-tandem mass spectrometry (GC-MS/MS) quantification. Under optimal conditions, the established method presented good linearity (correlation coefficient ≥ 0.9996), precision (relative standard deviation ≤ 13%), accuracy (81–105%), sensitivity (limits of quantification: 4–18 ng kg −1 ) and extraction performance (10 min).
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 16
·3376
·
IF 4.6
Jian Chen,Afang Zhang
Solid–liquid phase change materials (PCMs) have attracted significant attention due to their high enthalpy, which enables superior energy storage density. However, it is difficult to maintain their original shapes in a molten state. Therefore, confining PCMs within porous materials is an important method, either through mixing molten polymers and PCMs or confining PCMs in pre-prepared porous materials (e.g., aerogels). The former method is straightforward and easy to execute but its stability is severely limited, and the latter is exactly the opposite. Herein, aerogel-confined functional liquid made via in situ solid–liquid host–guest composite strategy is reported. As a proof of concept, Nylon 66 and 1,6-hexanediol are selected as the solid and liquid phases, respectively. 1,6-hexanediol not only serves as a solvent to dissolve Nylon 66 but also induces sol–gel transition during the cooling process and acts as a PCM to store energy. Unlike aerogel-supported systems requiring multi-step processing, this approach integrates porous host formation and PCM encapsulation in one step. The resulting shape-stabilized PCMs (ss-PCMs) exhibit obscure leakage, high latent heat (160 J/g), mechanical robustness (compressive modulus of 3.6 MPa), and low thermal conductivity (0.081 W/(m·K)) above 75 wt% loading of 1,6-hexanediol. These ss-PCMs enable infrared stealth by delaying thermal detection and passive thermal buffering that suppress temperature fluctuations. The in situ solid–liquid host–guest composite strategy is straightforward, being achievable through a one-pot method involving heating and cooling cycles, with high raw material utilization and minimal waste generation, thus maximizing the conversion rate of raw materials into the final product. By combining the excellent liquid retention capability of aerogels with process simplicity, this methodology opens new avenues for the development of ss-PCMs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shiyu Zhang,Aiguo Rao,Kai Lin,Qi Yao,Chunhui Niu,Lei Wang,Mingqing Yang,Xueqiong Bai,Yong Lv
Recently, the Fabry–Perot (F–P) cavity electrochromic devices, which are constructed by combining nano-size inorganic electrochromic material WO 3 and reflective metal layers, have attracted considerable attention due to their potentials in the fields of dynamic multicolor displays and active camouflage. However, in the few studies that have been reported, the peak reflectance of flexible F–P cavity multicolor electrochromic devices in the visible wavelength band is generally lower than 30 %, which limits their reflective display and camouflage effects in high-brightness environments. Thus, we have combined multicolor reflective electrochromic electrodes in WO 3 /Au asymmetric F–P nanocavity constructed by magnetron sputtering on a Nylon 66 porous substrate with a highly transparent UV-cured gel electrolyte and a PET plastic sealing procedure. As a result, a flexible and dynamic multicolor electrochromic skin with high reflectance (R max ＞50 %) and excellent flexibility (bending radius of 4 mm) has been fabricated. The WO 3 electrochromic layer at the top works as the dynamic dielectric layer in the broadband absorption Fabry–Perot cavity, and the inert metal Au layer at the bottom works as the reflective layer. The WO 3 /Au asymmetric F–P cavity can acutely capture the variation in optical constants of WO 3 due to the thickness change and electric-driven effects. This cavity facilitates the selective reflection and absorption of the energy distribution of the spectrum after the induced interferometric resonance. As a result, the cavity exhibits a rich array of structural colors, including ocher, taupe, yellow, orange, green, and violet. The electrochromic skin exhibits a fast switching time and maintains 99.43 % of the optical modulation amplitude (ΔR) after 110 coloring/bleaching cycles. It provides a potential option in the field of flexible high-brightness reflective displays and dynamic camouflage in the future.
研究领域:
材料科学
·
光学工程
·
柔性电子
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）