FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Li Ding,Qiang Huang,Wenyu Xiang,Xiong Fu,Bin Zhang,Jian-Yong Wu
Intact parenchyma cells were successfully isolated from potato tuber and chemically cross-linked with 5–12 wt% sodium trimetaphosphate/sodium tripolyphosphate for investigating the effect of cross-linking on the structural characteristics and enzyme susceptibility of starch encapsulated within the cell walls. The results indicated that both starch and cell wall polysaccharides were cross-linked, and the swelling power of starch was significantly decreased with increasing degree of cross-linking. The cross-linking reaction also significantly reduced the rate and extent of starch digestion in both intact and disrupted cells after cooking. In addition, the cell-wall barrier effect on starch digestion increased with the degree of cross-linking, due probably to that limited starch swelling and pectin solubilization during cooking process partially protected cell wall integrity and thus decreased cell wall permeability. Overall, the study suggests that chemically cross-linking of cell wall polysaccharides can slow down the in vitro starch digestion of cooked potato foods .
研究领域:
食品科学
·
植物生理学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Chunli Liu,Yuxuan Sun,Zhenbin Chen,Suobo Zhang
An integrally skinned dense ultrafiltration (UF) membrane was prepared using partially di-quaternized poly(sulfone- co -ethernitrile) random copolymer (PSF- co -DQAPEN) via classical nonsolvent induced phase inversion process (NIPS). Then the original UF membrane was molecularly restructured through a combined process of chemical quaternization-crosslinking reaction and thermal annealing for the preparation of a crosslinked nanofiltration (NF) membrane, in which p -xylylene dichloride (PXDC) and isopropanol were employed as crosslinking agent and nonsolvent treating medium, respectively. The influence of reaction time and crosslinker concentration on membrane performance were investigated. X-ray photoelectron spectroscopy (XPS) of membrane surface and solubility test of membrane were employed to study the chemical composition and crosslinking properties of membranes, and those results revealed that the original membrane had been successfully crosslinked after this post treatment process. The separation performance of membrane was ultimately changed from UF-level to NF-level after the quaternization-crosslinking reaction and thermal annealing treatment process. The optimum crosslinked NF membrane possessed MgCl 2 rejection of 98.2% and water permeate flux of 4.12 L m −2 h −1 bar −1 . Moreover, owning to the excellent chemical stability of membrane material, the crosslinked membrane had outstanding resistance to chlorine, acid and base, thus it can be used for water softening and removing of positive dyes. Given the convenience and feasibility of this modification method, integrally skinned NF membrane could be easily fabricated via the post chemical crosslinking and thermal annealing process of UF membrane using proper treating approaches.
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
DESALINATION
·
2023
·
IF 9.9
Yuyan Hai,Xin Wen,Rui Ma,Can He,Xue Yang,Rihua Xiong,Jingyun Chen,Qiaoyi Sun
An in-situ chemical cross-linking rejuvenation technique for reverse osmosis (RO) membranes was developed and investigated utilizing pH-responsive polymer with multiple carboxyl groups to improve the salt rejection and performance stability of end-of-life RO membranes. Polyacrylic acid (PAA) was used as a rejuvenating agent to cross-link with amino groups on the degraded RO membrane through EDC/NHS activated reaction. Indicated by ATR-FTIR, XPS , Zeta potential and SEM analyses, the covalent bonds between carboxyl groups and amino groups were generated on the PAA-rejuvenated membrane. The end-of-life RO membrane elements with an average NaCl rejection of 92.68 % could be recovered to 97.26 % by PAA rejuvenation. As a result of pH responsivity , PAA-rejuvenated membranes exhibit excellent rejection stability after continuous 12 cycles of alkali and acid alternate cleaning. The adjustable salt rejection and the durability of PAA-rejuvenated membrane elements were validated in real water tests for 185 days at a coal mine water treatment plant , indicating the practical application potentiality. The effects of initial end-of-life RO membrane condition on PAA rejuvenation are also provided.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Lili Zhang,Yuxuan Xu,Tengyu Feng,Yu Zhang,Jiajun Sun,Xiaodong Wang,Chengying Bai,Xiaohong Zhang,Jun Shen
There is a growing demand for the development of epoxy resin modified with biomaterials, aiming to achieve high toughness. Herein, chitosan crosslinked epoxy resin (CE) was synthesized by diisocyanate as a bridge. With 4,4′-diamino-diphenylmethane (DDM) as the curing agent, thanks to the unique cross-linking structure of the CE resin and the presence of carbamate groups, the cured CE/DDM exhibited superior properties compared to commercially available epoxy resin (E51). The tensile strength of the cured CE-3/DDM reached 90.17 MPa, the elongation at break was 11.2 %, and the critical stress intensity factor (K IC ) measured 1.78 MPa m 1/2 . These values were 21.4 %, 151.6 %, and 81.6 % higher than those of the cured E51/DDM, respectively. It is worth noting that the addition of biomass material chitosan did not reduce the thermal stability of the resin. Additionally, the CE coatings on the metal substrate exhibited exceptional corrosion resistance , as evidenced by higher impedance values in electrochemical impedance spectroscopy (EIS) and polarization voltages in the Tafel curve compared to those of the E51 coating. This study opens up a novel approach to modifying epoxy resin with biomass materials with high toughness and corrosion resistance, without sacrificing other performance.
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
POLYMER
·
2022
·
IF 4.432
Jinyang Liu,Yang Gao,Guanghui Gao,Lijie Duan
As a promising functional material , hydrogels have received extensive attention in the field of flexible wearable sensors . However, it remains a huge challenge to explore a multifunctional hydrogel sensor combining excellent self-adhesion, strain sensitivity, mechanical attributes, and self-healable ability. Here, different from the traditional dissolution method with strong acidic media, chitosan (CS) was directly dissolved in 2-acrylamide-2-methylpropane sulfonic acid (AMPS) and ferric solution, and then combining acrylic acid (AA) to construct a multifunctional hydrogel based on the synergy of metal complexation and chemical cross-linking. The hydrogels exhibited excellent adhesion both in air and underwater, proper mechanical attributes and self-healable properties. Moreover, the hydrogel with good electrical conductivity possessed strain sensitivity, which could serve as strain sensors to detect body movements. Therefore, this work could broaden sight into the preparation of multifunctional hydrogel strain sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Natural Fibers
·
2022
·
IF 3.507
Xuanxuan Du,Binjie Xin,Wang Chun,Yan Liu,Fuli Zhang,Jinhao Xu
Preventing the penetration of water while allowing it to pass through quickly is the key to achieving waterproof and breathable membranes; it opens up new possibilities for applications in all areas. Herein a novel functional nanofibrous membrane can be prepared via a facile electrospinning strategy, thermal post-treatment and chemical cross-linking, capable of providing excellent mechanical performance. Low-melting-point polyvinyl butyral (PVB) elastomer are added to polyvinylidene fluoride (PVDF) to modify the bonding network structure of the interfiber-adherent membrane, imparting durability and high mechanical properties to the membrane. Subsequently, the blocked isocyanate prepolymer (BIP) is used as the chemical cross-linker with PVDF and polyvinyl butyral (PVB) hybrid system to strengthen the cross-linking structure. Through systematically characterize the morphologies, contact angle, water vapor transmittance rate (WVTR) and hydrostatic pressure, it is studied that the effect of concentrate of PVDF/PVB/BIP and thermal-induced temperature on the waterproofness and breathability. The results indicate that the prepared nanofibrous membranes can maintain highly hydrostatic pressure (93.27kPa) and high WVTR (10.28 kg m−2 d−1); meanwhile, the membranes exhibit the excellent tensile stress (13.07MPa), indicating that it has a broad potential application prospect in the separation process and protective clothing.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 6
·1655-1664
·
IF 2.339
Li Aiai,Gu KaiFeng,Zheng Honglin,Zhou Yong,Gao Congjie
Polypropylene microporous membranes (PPMMs) have a broad range of applications owing to their outstanding performances and low cost. However, PPMMs are highly hydrophobic and the water permeability is terrible, which enormously obstructs the applications of PP membrane in water treatment. In this work, PPMMs are modified by a chemical crosslinking method, and a crosslinked hydrophilic coating layer is formed on the membrane surface, which greatly improves the hydrophilicity and permeability of the PP membrane. The water flux of the modified membranes is about 350 L·m −2 ·h −1 (the pressure of 0.2 MPa). The water contact angles are reduced to about 10°, and compared to unmodified membranes, it is reduced by 90°. Meanwhile, the flux repeatability experiment of the modified membrane proves that the crosslinking agent improves the stability of the membrane. X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectrometer are employed for the characterization of chemical properties and morphological variances of original and modified membrane surfaces. The results exhibit that the groups such as C–O, O=C–O, and O–C–O are introduced successfully to the PP membrane surface.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 29
·22638-22646
·
IF 3.84
Chengsha Wei,Mingming Chen,Dong Liu,Weiming Zhou,Majid Khan,Xibo Wu,Ningdong Huang,Liangbin Li
In this article, we report the synthesis of a disulfide bonded reversibly chemically cross-linked ion gel with high toughness and conductivity by sequential triblock copolymer self-assembly and the subsequent oxidation of thiol groups. Through reversible thiol-disulfide exchange, the ion gels had both high toughness of chemicals and recyclability of physical cross-linked ion gels. The triblock copolymer (SOS-SH) was prepared as follows: first, the RAFT copolymerization of styrene and 4-vinylbenzyl chloride (VBC) using CTA–PEO–CTA as a bi-functional macroRAFT agent was performed to obtain a triblock copolymer (SOS-Cl); then, the chloride group of SOS-Cl was replaced by an azido group to obtain SOS-N3; and finally, the click reaction of SOS-N3 with O-ethyl-S-prop-2-ynyl carbonodithioate and subsequent aminolysis were conducted to obtain SOS-SH. The disulfide bonded reversibly chemically cross-linked ion gel could be re-dissolved when mixed with a little amount of mild reducing agent (e.g., DTT) in CH2Cl2 with vigorous stirring, which reformed again after the removal of solvent and oxidation of thiol groups. The ion gels could undergo the reduction–oxidation cycle at least twice with a little loss of ionic conductivity and toughness (less than 25%), exhibiting good recyclability. Raman measurements were performed to confirm the existence and the key role of disulfide bond on the recyclability.
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
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2022
·
IF 6.51
Xier Pan,Yushu Li,Weilin Pang,Yaqi Xue,Zhuxian Wang,Cuiping Jiang,Chunyan Shen,Qiang Liu,Li Liu
Poly(vinyl alcohol) (PVA) and carbomer were used as the hydrogel system to fabricate glabridin-loaded hydrogel-forming microneedles (HFMNs) by chemical cross-linking (CCMNs) and physical cross-linking (PCMNs). The properties and drug permeation effects of glabridin-loaded HFMNs with different methods were compared. They both owned excellent shapes, mechanical and insertion properties. PCMNs showed collapsed shapes during swelling due to the low cross-linking rate and high porosity, which probably results in resealing of skin pores during transdermal drug delivery. However, CCMNs could rapidly swell within 2 h with slightly bending. The infrared spectra indicate that CCMNs and PCMNs might form the hydrogel network by generating hydrogen and covalent bonds, respectively. The in vitro release studies showed that cumulative permeation amount within 24 h (1654 μg/cm 2 ) of CCMNs significantly higher than that (372 μg/cm 2 ) achieved by PCMNs and that (118 μg/cm 2 ) achieved by glabridin-loaded gel. The skin barrier recovery test suggests the desirable security of both microneedles (MNs), notwithstanding the presence of mild erythema in the mouse skin applied CCMNs. These results indicate that CCMNs were more desirable for glabridin delivery using PVA and carbomer as a skeleton of the hydrogel network.
研究领域:
药剂学
·
生物材料
·
皮肤科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhang Chenyuan,Liu Zhiqiang,Zhang Zhijia,Zhou Wenjun,Zhang Songsong,Wang Guojun,Wang Qiang,Ma Teng,Wang Lin,Wei Hao
Self-healing research based on commercial polymeric materials (such as polyurethane) is beneficial to sustainable development by prolonging the life of materials. However, developing polymeric materials that integrate robust mechanical properties with self-healing ability at ambient temperature remains a formidable challenge. The formation of polymeric materials by physically and chemically dual crosslinking structures is a powerful method to improve mechanical properties. Herein, a series of dual crosslinking self-healing polyurethane have been designed and successfully synthesized by incorporating 2-ureido-4[1H]-pyrimidinone (UPy) units and triethanolamine (TEOA) into the polymer networks. Relying on the reinforcement of chemical crosslinking which is induced by TEOA, the resulting polyurethane exhibited robust strength of 10.3 MPa and elongation at break of 569.4%, which are quite prominent compared with previous reports. At the same time, the recombination of hydrogen bonds makes the polyurethane with UPy structure achieve rapid self-healing after 24 h at 40°C and the strength recovered to 4.98 MPa. This work provided a novel way to fabricate sustainable polyurethane with robust mechanical properties.
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
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Jianyu Xu,Xin Liu,Xiuyan Ren,Guanghui Gao
Hybrid crosslinking hydrogels have exhibited excellent mechanical properties, however, the relationship between chemical and physical crosslinking in the various deformation stages is still indistinct. Here, a hybrid hydrogel was explored by inducing low density of chemical crosslinking into latex particle hydrogels (LP-Gel), in which latex particles act as physical crosslinking centers for inducing efficient aggregation of hydrophobic chains. The resulting hybrid hydrogel exhibited extraordinary mechanical performance. It is found that the role of chemical and physical crosslinking was different during different deformation levels. The synergistic effects of chemical and physical crosslinking allow hydrogels to dissipate a large number of energy, significantly enhancing the mechanical strength of hydrogels. Moreover, the hybrid hydrogel exhibited puncture resistant, excellent ductility and rapid recovery.
研究领域:
材料科学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2020
·Vol. 41
·期 1
·65-71
·
IF 1.126
Zhengdong Fei,Dong Zheng,Ping Fan,Feng Chen,Mingqiang Zhong
A triple interpenetrating polymer network (IPN) with dual responses to temperature and pH was constructed based on chemical crosslinking and electrostatic interaction. In this IPN, CaCO 3 microspheres were used as the kernel and PNIPAAM/sodium alginate microcapsules were prepared by the inverse emulsion polymerization method. Research results demonstrated that CaCO 3 kernels were decomposed into Ca 2+ and CO 2 at pH 1.2. Such decomposition facilitated the formation of triple IPN of Ca 2+ crosslinking. Moreover, microcapsules were expanded by tension of CO 2 and the volume increased to 3.55 × 10 5 times that of the original microcapsules, with capsules remaining an intact morphology. These microcapsules loading doxorubicin hydrochloride (DOX) stability and responses to environment were investigated. No drug overflow was observed at pH 7.4, indicating the high stability of microcapsules. However, DOX was released gradually in the simulated human stomach acid with a weak solution of hydrochloric acid (pH 1.2, 37 °C). This showed that the prepared microcapsules were feasible for drug-loaded capsules and the controlled drug release behavior could relieve side effects of drugs to human body. Moreover, it will help to increase the drug utilization and realize accurate treatment.
研究领域:
材料科学
·
药学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）