Polymers
·
2021
·Vol. 13
·期 15
·2496
·
IF 4.329
Shiyou Tian,Jicong Zhang,Qiong Zhou,Limei Shi,Wenwen Wang,Dong Wang
We report photochromic polyamide 6 (PA6) which was synthesized by hydrolyzed ring-opening polymerization of ε-caprolactam with spiropyran (SP) embedded in the polymer chains. It indicated that crystallinity degree of the resulting copolymers was decreased since only PA6 segments can crystallize with increasing content of SP modifier. Meanwhile, toughness of photochromic PA6 was decreased. The photochromic property analysis indicated that the sample with more flexibility and more content of SP was more sensitive to UV light at the beginning of irradiation than other samples and its color after being irradiated for 1 min tended to reddish. Investigation revealed that the UV-vis absorbance of SP-PA6-3 had negligible decay after 10 cycles, which indicated SP-modified PA6 possessed excellent photoresponse reversibility and fatigue resistance.Keywords:photochromic;polyamide 6;spiropyran;structure and properties
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·
IF 1.174
Chunxi Qin,Jie Tang,Fenglei Bi,Zhenhao Xi,Ling Zhao
The solid–liquid extraction process of nylon 6 to eliminate small molecules, i.e. , caprolactam (CL), cyclic dimers (CD) and cyclic trimers (CT), is investigated in detail by both batch extraction experiments and numerical simulations. In the batch extraction experiments, due to the small molecules attaching to the polymeric surface, the basic physical mechanism shifts from surface diffusion to internal diffusion as the extraction proceeded. The experimental data are well reproduced by a diffusion model consisting of two distinct steps, characterized as surface diffusion and internal diffusion. Furthermore, based on the established mass transfer mechanism and diffusion model of the two distinct steps, the equilibrium constants and internal diffusion coefficients of CL, CD and CT are acquired. An industrial countercurrent extraction tower is further simulated. It is found that the extraction efficiency of CL can be significantly improved by increasing the temperature at the bottom portion of the tower. The elimination of CD, which can be greatly promoted by a high-concentration CL-water solution, is controlled by mass transfer resistance, whereas the removal of CL is mainly affected by the equilibrium.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 9
·1459-1468
·
IF 1.931
Guan Peiwen,Ren Cong,Shan Houchao,Cai Di,Zhao Peimian,Ma Dongze,Qin Peiyong,Li Shufeng,Si Zhihao
To meet the increasing requirements toward biobutanol, pervaporation membrane with high separation performance needs to be developed. In this work, a hydrophobic MAF-6 (RHO-[Zn(eim) 2 ]) was synthesized and its adsorption properties for 1-butanol was systematically studied, which are supposed to benefit the separation performance of polydimethylsiloxane (PDMS) membrane. The hydrophobic MAF-6 particles were therefore doped into PDMS to fabricate mixed matrix membrane. The morphology, chemical structure, and other properties of particles and hybrid membrane were fully studied by SEM, PXRD, FT-IR, TGA, and BET. Results demonstrate that the hydrophobicity of PDMS membrane is improved with the water contact angle increasing from 112.7° to 118.1° after being doped with MAF-6, as well as enhanced adsorption ability toward 1-butanol. More importantly, when doping MAF-6 into PDMS layer, the enhancements of 23.30% and 41.93% are separately observed in the separation factor and total flux to separate 1.5 wt% 1-butanol solution, compared with the PDMS membrane. In addition, the heat energy consumption of pervaporation process is decreased from 4.27 to 3.71 kJ g −1 via the doping of MAF-6. Overall, this work confirms that the hydrophobic particle such as MAF-6 is not only conductive to enhance the separation performance of PDMS membrane but also helpful to decrease the energy consumption.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 35
·20504-20514
·
IF 3.119
Jianwen Wei,Siqi Chen,Yu Li,Zeyu He,Linlin Geng,Lei Liao
To find an alternative adsorbent with high adsorption performance, KIT-6 was prepared by hydrothermal crystallization synthesis using tetraethyl orthosilicate as a silicon source and triblock copolymer P123 as a template. Then the silane coupling agent (3-chloropropyl)trimethoxysilane was first grafted onto KIT-6 mesoporous material and then the polyethyleneimine (PEI) was further grafted through the substitution reaction between amino groups and chlorine atoms. The functionalized KIT-6 was denoted as PEI/KIT-6. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption, elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The Cu2+ adsorption performance was determined by inductively coupled plasma (ICP). The results showed that the average loading of the amino groups was 3.74 mmol g−1, and the modified KIT-6 still has a stable mesoporous structure without pore blockage. With the dosage of 1 g L−1 PEI/KIT-6 and at room temperature, the optimum pH value for adsorption of 100 mg L−1 Cu2+ was 6.0. The adsorption capacity of PEI/KIT-6 for Cu2+ increased with the increase of reaction temperature, and the maximum adsorption capacity of Cu2+ was 36.43 mg g−1. The adsorption capacity tends to reach equilibrium after 120 min, and the optimum adsorption temperature was 35 °C. The pseudo-second-order kinetic model was found to be well suited for the adsorption process of Cu2+. Adsorption equilibrium data could also be described well by the classical Langmuir and Freundlich isotherm models. The adsorption tends to be the chemisorption of a monolayer.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 20
·12018-12029
·
IF 4.22
Chen Juan,Gong Caihong,Yang Ce,Yi Chunwang
The harsh synthesis conditions and lack of hard segments have long presented difficulties in the preparation of polyamide-based thermoplastic elastomers (TPAEs). In this work, a facile synthesis of TPAEs was developed using amide exchange. First, itaconic acid-polyoxypropylene diamine copolymer (IA-PPA) was synthesized by copolymerizing bio-based polyoxypropylene diamine (PPA D400) and itaconic acid (IA). The P2000 (IA-PPA with Mn ~ 2000) was then used as the soft segment of polyamide-6 based thermoplastic elastomers (PA6- b -P2000). Experimental results indicate that P2000 could directly initiate the ring-opening polymerization of caprolactam to form a prepolymer containing PA6 segments. PA6- b -P2000 thermoplastic elastomers were then obtained by the amide exchange reaction of PA6 segments. The structure and properties of IA-PPA and PA6- b -P2000 were further characterized in detail. The results demonstrate that the elastomers have good thermal stability and superior elasticity, which are highly dependent on the crystallinity and phase separation structure of the polyamide elastomer. Using this flexible approach, multifunction TPAEs can be designed and commercialized in a short time.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2013
·Vol. 28
·期 12
·1582-1588
·
IF 1.713
Wenyan Wang,Zhanwei Ma,Runjuan Liang,Tinghua Wu,Ying Wu
SnZn(OH)6 (ZHS) with different morphologies were synthesized by a facile self-templated method at room temperature. It was found that the morphology of ZHS could be controlled by varying the concentration of OH−. The crystalline structure and morphology of the particles were characterized by x-ray diffraction, UV-vis diffuse reflectance spectroscopy, scanning electron microscopy images, and N2 adsorption. The results indicated that the particles had almost uniform monoclinic geometry and uniform size. The photocatalytic activity of ZHS with different morphologies was tested through degradation of Rhodamine B (RhB). Therein, the hollow ZHS showed the highest light catalytic performance due to its large BET surface area, wide band gap, and high crystallinity.
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
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 15
·8438
·
IF 6.208
Mengying Yang,Jialu Luan,Yixin Xu,Chengtian Zhao,Mingzhu Sun,Xizeng Feng
6-BA is a common plant growth regulator, but its safety has not been conclusive. The heart is one of the most important organs of living organisms, and the cardiogenesis process of zebrafish is similar to that of humans. Therefore, based on wild-type and transgenic zebrafish, we explored the development of zebrafish heart under 6-BA exposure and its mechanism. We found that 6-BA affected larval cardiogenesis, inducing defective expression of key genes for cardiac development (myl7,vmhc, andmyh6) and AVC differentiation (bmp4,tbx2b, andnotch1b), ultimately leading to weakened cardiac function (heart rate, diastolic speed, systolic speed). Acridine orange staining showed that the degree of apoptosis in zebrafish hearts was significantly increased under 6-BA, and the expression of cell-cycle-related genes was also changed. In addition, HPA axis assays revealed abnormally expressed mRNA levels of genes and significantly increased cortisol contents, which was also consistent with the observed anxiety behavior in zebrafish at 3 dpf. Transcriptional abnormalities of pro- and anti-inflammatory factors in immune signaling pathways were also detected in qPCR experiments. Collectively, we found that 6-BA induced cardiotoxicity in zebrafish, which may be related to altered HPA axis activity and the onset of inflammatory responses under 6-BA treatment.Keywords:zebrafish;6-benzylaminopurine;cardiotoxicity;HPA axis activity;inflammation
研究领域:
毒理学
·
发育生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-8
·
IF 5.479
Jiang Dandan,Li Zheng,Jia Qiong
The design and preparation of magnetic cucurbit[6]uril hypercrosslinked
with polymers are described. The materials have a large specific surface, abundant
mesopores and cavities, and display superparamagnetism. They were applied to the
enrichment of ubiquitinated peptides from standard protein digests. Following
desorption with 0.15% TFA, the peptides were quantified by MALDI-TOF MS. The method
has a detection limit of 2 fmol·μL −1 and a mass
ratio selectivity of 1:5000 as shown for ubiquitin and bovine serum albumin. The
materials enable selective capture of ubiquitinated peptides from genuine samples
comprising of oyster mushroom and human serum. This demonstrates their potential for
the analysis of low-level ubiquitin in complex samples.
Schematic presentation for the synthesis of magnetic
cucurbit[6]urils hypercrosslinked polymers
(MagCB[6]-HCPs).
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Chen Zipeng,Zhang Qian,Ding Liping,Lv Guangxin,Liu Tianji,Yang Zhengwei,Jiang Yi,Li Longnan,Li Wei,Ding Feng,Xu Weilin,Zhu Jia,Zhu Bin
Infrared (IR)-transparent radiative cooling textiles show great promise for achieving personal thermal comfort and reducing energy consumption. However, besides a few synthetic fiber materials proposed as IR-transparent textiles, traditional textile materials used to achieve IR transparency have not been realized, impeding large-scale practical applications. Here, based on a common textile material Nylon 6 (PA6), we design a high drawing process with rapid solvent evaporation to achieve IR-transparent PA6 textiles. By altering the chain conformations and crystal structures, the molecular vibrations in the IR region (IR absorption) of PA6 can be significantly weakened. Meanwhile, this process also tailors the fiber to the nanoscale and minimizes IR reflection. Consequently, a human body covered by our textile can stay 2.1 °C cooler than with cotton, corresponding to ~20% indoor energy savings in cooling. We expect that our work offers an innovative pathway to regulate IR radiation for personal thermal management.
研究领域:
材料科学
·
能源工程
·
纺织科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Composites Part C: Open Access
·
2020
·
IF 0
Xubing Fu,Xingke Zhao,Lanjie Li,Chenxu Zhou,Xia Dong,Dujin Wang,Guisheng Yang
The development of innovative methods to prepare graphene-based polymer composites with remarkable properties has become a priority due to the many practical applications of these microstructures. Herein, a new technology was used to fabricate composites by combining graphene materials and polymer microspheres. Polyamide 6 (PA6) microspheres were synthesised by reaction-induced phase separation method, and they were wrapped with few-layer graphene (FLG) or graphene oxide (GO) by exfoliated adsorption method, which allows FLG and GO sheets to form a three-dimensional network structure in the PA6 matrix. Electrical and mechanical characterisation led to a distinct improvement in the properties of PA6 composites, which were superior to traditional graphene/polymer composites. Moreover, the process proposed in this work proved to be an effective method to prepare graphene/polymer composites, suitable for industrial production, and can be extended to other kinds of composites with nanofillers.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanming Chen,Shaorong Liang,Wei He,Shouxu Wang,Chong Wang,Zhuoming Du,Yongjie Du,Weiguo Yang,Binyun Liu,Yan Hong
A simple and chromium-free method for the metallization on engineering plastic polyamide-6 (PA6) by UV irradiation is proposed in this article. The surface graft polymers with specific adsorption activity are developed through one-step UV exposure operation, which captures Pd 2+ in the activation process. The chemisorption of Pd 2+ is further reduced into catalytic Pd 0 to enable the substrate with catalytic nucleus for conventional copper electroless deposition (ELD). The grafting layer and the deposited copper coating are characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, contact angle measurements, scanning electron microscopy, and X-ray diffraction. The results indicate that successful grafting occurs on PA6 after UV excitation. In addition, the as-deposited copper layer shows excellent conductive performance and high adhesion with the PA6 substrate. It’s expected that this emerging and feasible approach would have broad prospects for the metallization of plastic and offer significant value in the plating industry.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTRONIC JOURNAL OF BIOTECHNOLOGY
·
2025
·
IF 2.5
Yi Li,Jiacheng Tang,Kaixiang Xin,Zongda Chen,Lele Zhao,Yifan Zhao,Yinbiao Xu,Pei Zhou,Yang Sun,Yupeng Liu,Hua Li
Background Nicotinic acid dehydrogenase possesses the capability to convert nicotinic acid into 6-hydroxynicotinic acid, a compound of significant research value as a pharmaceutical intermediate. The extraction of nicotinic acid dehydrogenase is primarily performed by strains. However, the enzyme activity of the strains reported currently is relatively low, and their potential to catalyze the production of 6-hydroxynicotinic acid is insufficient to meet industrial requirements. Results Due to the revealing properties of 6-hydroxynicotinic acid, this study proposes a technique for calculating the luminescence intensity of colonies, which is based on a fluorescence spectrometer. The developed method establishes a reliable linear relationship (88.2%) between the luminescence intensity and enzyme activity. Consequently, it has been employed to screen strains that produce nicotinate dehydrogenase. This screening approach allows for the evaluation of about 500 enzyme-producing strains daily, presenting an efficient strategy for screening. Conclusions Through this approach, a novel high enzyme activity strain producing nicotinic acid dehydrogenase, Pseudomonas poae have been obtained, which designated as HD530. After process optimization, it was utilized to produce 6-hydroxynicotinic acid, achieving a high yield of 155.45 g/L within 72 h, meeting the requirements for industrial production. The effectiveness and potential of this technique lie in its application for strain screening and improvement.
研究领域:
微生物学
·
生物技术
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）