POLYMER TESTING
·
2019
·
IF 2.943
Zhuo Cao,Weijie Li,Xidong Suo,Yaodong Liu,Chunxiang Lu
Polyacrylonitrile (PAN)/cellulose composite fibers have been produced by dry-jet gel spinning through their co-solution. The rheological properties of PAN/cellulose/dimethylacetamide/LiCl solutions containing different cellulose contents from 0 to 10 wt% were characterized, and 5 wt% PAN/cellulose composite solution shows the best solution homogeneity. During gel spinning, the cellulose forms elongated particles inside the gelation bath, and the particle diameters depend on the as-spun draw ratio. It was found that the glass transition of PAN fibers shifts to higher temperatures along with the increase of cellulose content, and the glass transition activation energy of PAN chains becomes higher when cellulose particles become smaller. Regardless the changes of cellulose amount (2–10 wt%) and particle diameter (7.1–1.4 μm), the cyclization activation energy of PAN/cellulose composite fibers is 13–17% lower than that of neat PAN fibers. Our experiments suggest that the addition of cellulose in PAN fibers has no direct effect on the cyclization reaction of PAN chains. Instead, the released by-products during the pyrolysis of cellulose at high temperature degradation affect the cyclization reaction of PAN chains.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Weisong Zhao,Hong Chi,Xue Zhang,Yaoguang Wang,Tianduo Li
The emerging two-dimensional material MXene is widely used in metal ions adsorption. However, among the various modification strategies of MXene , the study on the synergistically effect of linear natural polymer and nano-sized particles and their interaction mechanism remains unclear. In this work, polyhedral oligomeric silsesquioxane (POSS-OH) and hydroxypropyl cellulose (HPC) were grafted onto Ti 3 C 2 T x MXene , producing chemically stable HPC/Ti 3 C 2 T x /POSS-OH (CHMP) with adjustable interlayer space. Under the synergistic interaction, the CHMP exhibited obviously increased kinetics, high selectivity and good repeatability towards the adsorption of uranium ions (UO 2 2+ ). The adsorption capacity of CHMP has been increased by 35.08%. In addition, X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscope (HR-TEM) indicated high chemical stability of CHMP. Langmuir isotherm model suggested that the adsorption mechanism of CHMP on UO 2 2+ was the single-layer adsorption coordinated with oxygen-containing functional groups. The maximum adsorption capacity of CHMP was 307.67 mg g −1 . Furthermore, XPS and simulation results suggested that the adsorption mechanism of UO 2 2+ was both strong coordination binding with hydroxyl groups and electrostatic interaction .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Wenhao Guo,Zhouhang Lei,Zhengqi Tan,Xingyue Fang,Xueyu Li,Liangbin Li
Developing sustainable biobased alternatives is imperative not only to address mounting environmental concerns but also to overcome the intrinsic limitations of conventional petroleum-derived optical films in next-generation displays. However, conventional biobased materials like cellulose triacetate suffer from restricted optical tunability (typically negative C-plate behavior). Herein, we fabricate high-performance optical films from naturally sourced cellulose by benzoate substitution with controlled degrees of substitution (DS) from 0.89 to 3.00, using a homogeneous ionic liquid platform. By systematically investigating the “structure-processing-property” relationships, we reveal a distinct nonmonotonic “V-shaped” dependence of birefringence on DS. Crucially, we identify a steric-hindrance-driven orientation flip of the benzoyl side groups, which enables the precise tailoring of optical properties: from a “zero-birefringence” state at DS ≈ 1.55 to specific Negative Retro-Zero characteristics (nx > nz > ny) for 1.55 < DS < 2.59, and finally to positive C-plate behavior at DS > 2.59. The precise control over birefringence achieved in this work broadens the applicability of cellulose derivatives and paves the way for the design of advanced materials for next-generation display technologies.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Kai Xiong,Jing Guo,Yingying Chen,Rui Tong,Yunjia Cai,Heng Xie,Ting Wu,Jinping Qu
Bioinspired superamphiphobic microreactor mimics starfish tube feet for transport. • Superamphiphobic surface repels water, oil, and cellulose nanocrystal droplets (CA > 150°). • Magnetic response enables droplet transport at speeds up to 16 mm s −1 . • Continuous photonic pigment production achieved at 116.28 g m −2 d −1 . The practical application of cellulose nanocrystal photonic pigments is hindered by their time-consuming and discontinuous preparation processes. Inspired by the transport phenomenon and mechanism of starfish tube feet, a bioinspired superamphiphobic microreactor is fabricated massively via an industrial micro-extrusion compression molding technology for the efficient fabrication of photonic pigments. The microreactor, featuring a starfish tube feet-inspired micropillar, demonstrates exceptional superamphiphobicity, with cellulose nanocrystal suspension contact angle of 156.6 ± 2.2°. Furthermore, the incorporation of magnetic particles imparts the microreactor with a sensitive magnetic response. This enables the precise transport of cellulose nanocrystal droplets at high speeds of up to 16 mm s −1 . Remarkably, the microreactor maintains consistent performance over more than 100 cycles, demonstrating exceptional durability. Leveraging these attributes, the microreactor mimics the rhythmic motion of starfish tube feet to propel the cellulose nanocrystal droplets to designated locations for self-assembly into particles and subsequent collection. Then the dried particles can be efficiently transported and collected, achieving continuous production for the photonic pigments at a rate of 116.28 g m −2 d −1 . The proposed approach offers a robust strategy for the scalable manufacturing of photonic pigments and advancing their path to practical application. The bioinspired superamphiphobic microreactor with surface micropillars is fabricated via micro-extrusion compression molding. Under a moving magnetic field, these micropillars are actuated to directionally propel cellulose nanocrystals suspension droplets for self-assembly into photonic pigment particles. This process enables continuous production and collection, providing a novel strategy for industrial application of structural color materials. Download: Download high-res image (356KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 18
·6402-6411
·
IF 0
Liangbo Yu,Jinyou Lin,Feng Tian,Xiuhong Li,Fenggang Bian,Jie Wang
Cellulose nanofibrils (CNF), as a kind of renewable, sustainable and biodegradable natural-based nanomaterial, have shown great potential application in numerous fields due to their fascinating properties. Some properties of CNF-based materials are closely related to their cellulose polymorph and crystallinity index. In this work, we present a facile method for the generation of CNF with tunable polymorphs and crystallinity via the alkali treatment of jute fibers under various conditions followed by (TEMPO)-mediated oxidation and mechanical disintegration. The changes of the cellulose polymorphs and crystallinity induced by alkali treatment on the jute fibers and consequently obtained CNF were well investigated by synchrotron radiation wide-angle X-ray scattering (SR-WAXS), Fourier transform infrared spectra (FTIR) and differential scanning calorimetry (DSC), respectively. Moreover, the morphology of the as-prepared CNF was also examined by transmission electron microscopy (TEM). It has been found that the CNF showed an identical cellulose polymorph to their source material, but a much higher crystallinity index, which revealed the feasibility of CNF generated from jute fibers with tunable polymorphs and crystallinity indexes.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
可持续材料
·
纤维素化学
✓ 已验证
DOI
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Xuejian Zhang,Feng Lin,Qian Yuan,Liping Zhu,Chunyan Wang,Shuguang Yang
Etherification of cellulose can get a series of water soluble derivatives, which can form hydrogen-bonded polymer complex with poly(acrylic acid) (PAA). Three cellulose ethers hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC) and methyl cellulose (MC) are LbL assembled with PAA to fabricate thin films. The hydrogen bonding of the films is characterized with FT-IR. The film growth behaviors are monitored by a quartz crystal microbalance (QCM) and a spectroscopic interferometer, which shows a different growth rate for different system and a strong dependence on pH values. The stability of the films can be increased by heat treatment. Once the cross-linked structure is formed, and the dissolution of film can be prevented even in the high pH value. In addition, the films show good water adsorption ability from environment. Owing to pH responsive behavior and good water adsorption , CE/PAA films can be explored for various applications, especially for biomedical application.
研究领域:
高分子科学
·
材料化学
·
薄膜技术
·
生物医学工程
·
智能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Feng Guo,Rizheng Han,Jishan Ying,Zeping Zhang,Rui Yang,Xing Zhang
In this work, bioinspired anisotropic polymeric heart valves were fabricated using composite materials from polyurethane (PU) and natural cellulose fiber bundles. Cellulose fibers with good alignment were obtained from balsa wood by a top-down process, which were then distributed in polyurethane to prepare cellulose fiber bundles reinforced polyurethane (CPU) by hot pressing. The storage modulus of the CPU along the direction parallel to the fiber alignment was 16.70 ± 0.80 MPa, whereas that along the direction perpendicular to the fiber alignment was 8.41 ± 0.94 MPa by dynamic mechanical analysis (DMA) tests at 1 Hz, comparable to aortic valve leaflets. Moreover, 2-methacryloyloxyethyl phosphorylcholine (MPC) was grafted onto the CPU surface (CPU-MPC) to improve hemocompatibility. With MPC modification, the water contact angle decreased significantly from 54.58° ± 2.98° to 26.42° ± 3.50°, and the platelet adhesion was reduced by 92%, compared to the original CPU. In vitro cell culture proved that both CPU and CPU-MPC samples did not show any cytotoxicity. Furthermore, the CPU composites were used to fabricate polymeric heart valves, which showed excellent hydrodynamic performance with a large orifice area (1.70 cm 2 ) and low regurgitation fraction (0.7%), meeting the requirements of ISO 5840–2 standard.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 45
·2202235
·
IF 15.153
Junmei Wang,Qian Liu,Jixing Gong,Zhongjun Wan,Jinping Zhou,Chunyu Chang,Donghui Zhang
Cardiac microphysiological systems are accurate in vitro platforms that reveal the biological mechanisms underlying cardiopathy, accelerating pharmaceutical research in this field. Current cardiac microphysiological devices and organs-on-chips consist of several layers prepared with complex, multi-step processes. Incorporating inorganic photonic crystals may cause long-term biocompatibility issues. Herein, micropatterned hydrogels with anisotropic structural colors are prepared by locking shear-oriented tunicate cellulose nanocrystals (TCNCs) in hydrogel networks through in situ polymerization, allowing the visualization and monitoring of cardiomyocytes. The anisotropic hydrogels are composed of highly ordered TCNCs with bright interference color and micro-grooved methacrylated gelatin with excellent biocompatibility. The microgroove patterns induce cardiomyocyte alignment and the autonomous beating of cardiomyocytes causes the hydrogels to deform, dynamically shifting the interference color. These micropatterned hydrogels could noninvasively monitor real-time changes of cardiomyocytes under pharmaceutical treatment and electrical stimulation through wavelength shifts in the transmittance spectra. This system provides a new way to detect the beat rate of cardiac tissue and it may contribute to high throughput develop.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Zhirong Hu,Haixia Zhang,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
Mixed matrix membranes (MMMs) combine the advantages of both polymers and inorganic fillers, and hold great promise for industrial gas separation. In this work, to enhance the interfacial compatibility between cellulose acetate (CA) matrix and ZIF-8 crystals, an interfacial design strategy was proposed by grafting polyethylenimine (PEI) onto ZIF-8 particles. The introduction of amine-rich PEI could regulate the surface property and maintain the pore accessibility of ZIF-8 crystals. In addition, the amine groups in PEI could interact with hydroxyl/carbonyl groups in CA chains to suppress the non-ideal voids at the ZIF-8/CA interface. With the aid of PEI, the interfacial compatibility between ZIF-8 and CA is substantially enhanced. Compared with pristine CA and ZIF-8@CA membranes, PEI grafted ZIF-8@CA (PZIF-8@CA) membrane exhibits a better gas separation performance, bearing a CO 2 permeability of 150.3 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 44.2 and 53.7, respectively. The separation mechanisms are attributed to the superior interfacial property , the good dispersion of ZIF-8 particles, the amine groups in PEI, and the high CO 2 solubility of the CA matrix.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 4
·1783
·
IF 4.6
Zhengyong Liang,Xing Li,Meng Li,Yulu Hong
The preparation and performance control of the cellulose membrane are one of the hot topics in the environmentally friendly separation membrane field. In this study, microcrystalline cellulose (MCC) was prepared by microwave-assisted acidic hydrolysis of cellulose obtained from jute, followed by the use of a mixture ofN-methylmorpholine-N-oxide and water as a solvent to obtain the homogeneous casting liquid, which was scraped and subsequently immersed in the coagulation bath to form a smooth and dense cellulose membrane. During membrane formation, the crystal structure of MCC changed from type I to type II, but the chemical structure remained unchanged. The mechanical strength and separation performance of the membrane were related to the content of MCC in the casting liquid. When the content of MCC was about 7%, the tensile strength of the membrane reached a maximum value of 13.49 MPa, and the corresponding elongation at break was 68.12%. The water flux (J) and rejection rate (R) for the bovine serum albumin were 19.51 L/(m2·h) and 95.37%, respectively, under an optimized pressure of 0.2 MPa. In addition, the coagulation bath had a significant effect on the membrane separation performance, and J and R were positively and negatively correlated with the polarity of the coagulation bath. Among them, it was note-worthy that J and R of membrane formed in ethanol were 33.95 L/(m2·h) and 91.43%, separately. Compared with water as a coagulation bath, J was increased by 74% at the situation and R was roughly equivalent, showing better separation performance. More importantly, the relationship between the structure and separation performances has also been studied preliminarily. This work provides certain guidance for the preparation of high-performance MCC membranes.Keywords:jute;microcrystalline cellulose;cellulose membrane;microwave-assisted hydrolysis;separation
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DENTAL MATERIALS
·
2022
·
IF 5.687
Yaning Zhao,Jian Yu,Jingmei Guo,Hongye Yang,Cui Huang
Objective To investigate the effects of a sodium carboxymethyl cellulose (SCMC)-based extrafibrillar demineralization conditioner on dentin bonding durability and explore the possible mechanisms. Methods The SCMC-based extrafibrillar demineralization conditioner was facilely developed by dissolving SCMC into deionized water at an appropriate concentration. A single layer collagen mineralization/demineralization model was designed to visualize extrafibrillar demineralization in detail. Dentin surfaces of human third molars were conditioned with 3 % SCMC or 37 % phosphoric acid (PA). The morphology, composition, and mechanical properties of conditioned dentin from each group were characterized. To evaluate dentin bonding performance, SCMC- and PA- conditioned dentin were applied with adhesive restoration using the dry-bonding technique. The microtensile bond strength (MTBS), interface nanoleakage, and in situ zymography were measured after 24 h of water storage, 10,000 thermocycles, or one month of collagenase aging. The inhibitory effect of SCMC on recombinant human matrix metalloproteinase-2 (rhMMP-2) and cell toxicity were also investigated. Results After SCMC conditioning, both demineralization of extrafibrillar minerals and retention of intrafibrillar minerals were observed in the single layer collagen model and the dentin ultrastructure . The mechanical properties of SCMC-conditioned dentin were largely preserved. Compared with PA, SCMC conditioning produced greater MTBS values and less nanoleakage expression after aging. Endogenous gelatinolytic activity was suppressed in SCMC-conditioned dentin. In addition to being nontoxic, the inhibition of rhMMP-2 by SCMC was confirmed to be dose-dependent. Significance From the perspective of minimal intervention, the SCMC-based extrafibrillar demineralization conditioner could improve dentin bonding durability, suggesting a promising strategy to extend the service life of adhesive restorations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Na Li,Hongying Wanyan,Shengchang Lu,He Xiao,Min Zhang,Kai Liu,Xiuliang Li,Bihui Du,Liulian Huang,Lihui Chen,Yonghao Ni,Hui Wu
Liquid marbles, as particle-armored droplets, have potential applications in microreactors, biomedicine , controlled release and gas detection. To improve the stability and biocompatibility of marble, biocompatible cellulose acetate particles and 3-allyloxy-2-hydroxy-propyl-cellulose (AHP-cellulose) were used to fabricate robust cellulose-based liquid marbles with excellent stability. Liquid marble was gelled into hydrogel marble via blue-light-irradiated polymerization of AHP-cellulose. The mechanical properties of cellulose-based hydrogel marble are superior to those of liquid marble. The rupture height of liquid marble is 10.5 m, which is 420 times greater than that of water marble (0.025 m). Surprisingly, the hydrogel marble with a 3 % AHP-cellulose concentration remained intact even after being dropped from a height of 50 m, which is comparable with the ability of a leather ball to withstand larger impact. When released from a height of 60 mm, hydrogel marble bounced to approximately 25.5 mm, 881 % higher than liquid marble (2.6 mm). Hydrogel marble exhibited long-lasting stability and was capable of monitoring ammonia with a detection limit of 365.2 mg/m 3 . The biocompatible cellulose-based hydrogel marble with excellent mechanical stability and reusability detection has great potential in chemical and environmental engineering as gas sensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）