POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 3
·795-806
·
IF 3.665
Fangzhou Yang,Bihe Yuan,Yong Wang,Xianfeng Chen,Liancong Wang,Hongming Zhang
Using layer-by-layer self-assembly technology, an intelligent nano-coating was constructed on melamine foam (MF) by electrostatic interactions between chitosan (CS) molecules and graphene oxide (GO) nano-sheets. According to the principle that GO is quickly reduced to reduced GO under high temperature, a fast fire-warning network can be constructed. Due to the protective effect of nano-coating constructed on MF, the thermal stability and flame retardancy of melamine composite foams are improved. As the nano-coating self-assembly layer increases to 20, its flame-response time is only 3 s, and the continuous alarm time is as high as 1280 s. These indicate that the prepared GO-CS composite foam possesses excellent flame retardancy and super-fast fire response. This study provides a novel idea for the application of bio-based nano-coating in the fire early response and warning.
研究领域:
材料科学
·
火灾安全工程
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 4
·1752-1762
·
IF 3.665
Jie Mao,Qi Jian Yu,Sui Wang
Smart hydrogel has been widely studied due to their unique response characteristics. Although many smart hydrogels have been developed, the preparation of high-performance and multi-responsive smart hydrogels remains a challenge. The application of developing new materials is also the valuable embodiment of materials, such as temperature sensors, thermal switches and anionic dye adsorption. In this study, poly( N -isopropylacrylamide) (PNIPAM) hydrogel with pore channels was prepared using agarose as a sacrificial template, and a polyaniline network structure was introduced into hydrogel pore channels to endow the hydrogels with stable conductivity. This point can be confirmed by the Fourier transform infrared spectroscopy and scanning electron microscopy images of hydrogels. The decomposition temperature of hydrogels characterized by thermogravimetric analysis. Thermal response analysis and electrical performance testing found that PNIPAM hydrogel with pore channels exhibited enhanced temperature-responsive swelling-shrinkage properties and high conductivity (1.83 S m −1 ). Based on this unique property, we demonstrated the application of materials in thermal switching (response temperature ~33°C) and can be potentially applied to the temperature sensor and anionic dye adsorption.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2508-2516
·
IF 3.665
Tao Zheng,Wengui Wang,Yaochi Liu
In this work, a novel phosphorus–nitrogen flame retardant (CN-DOPO), which was successfully prepared via a facile method of graphitic carbon nitride (g-C 3 N 4 ) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Polyamide 6 (PA6) composites were then prepared through melt blending with different ratios of g-C 3 N 4 /DOPO and different contents of CN-DOPO. CN-DOPO was characterized and confirmed using X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and scanning electron microscopy (SEM). PA6/CN-DOPO composites were investigated by limiting oxygen index (LOI), vertical combustion (UL-94), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and thermogravimetric analysis-infrared spectrometry (TGA-IR). The results indicated LOI value was increased from 23.4% to 29.2% and successfully passed UL-94 V-0 rating when the presence of CN-DOPO increased to 15 wt%. Moreover, mechanical properties of PA6/CN-DOPO composites had not deteriorated significantly due to CN-DOPO having better dispersion and compatibility in PA6. The morphological of char layer revealed that CN-DOPO formed a highly integrated char layer surface during the combustion process, as compared to that of pure PA6. Meanwhile, CN-DOPO decomposed to release gases could inhibit decomposition by diluting flammable volatiles. Accordingly, the special gas-condensed phase synergistic flame-retardant mechanism of PA6/CN-DOPO was proposed. This work indicated that CN-DOPO could endow PA6 with highly effective flame-retardant and good mechanical performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 10
·2301-2311
·
IF 2.578
Yue-Fei Zhang,Xiang-Feng Lin,Hui Hu
The combined nucleation effect of graphene oxide (GO) and calcium pimelate (CaPi) which are chemically compound together (expressed in GO − CaPi) in isotactic polypropylene (iPP) was investigated. Fourier transform infrared (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) verified that CaPi was chemically compound with GO by chelate bonds. The crystallization behavior and crystalline morphologies of iPP nucleated with different mass ratio of GO and CaPi were investigated. The crystallization peak temperature of iPP nucleated with 0.2 wt% GO − CaPi with the mass ratio of 1:5 (GO1 − C5) was increased by 8.3°C when compared with that of pure iPP, and the relative content of β-crystal reached up to 0.7962. Whereas, the crystallization peak temperature of iPP nucleated with 0.2 wt% GO and CaPi which are blended together by mechanical force (expressed in GO + CaPi) with the mass ratio of 1:5 (GO1 + C5) was only increased by 5.0°C. It was attributed to that the aggregation of GO + CaPi caused the decrease of the crystallization peak temperature, while the GO1 − C5 uniformly dispersed in the iPP matrix. Unexpectedly, the relative content of β-crystal of iPP nucleated with 0.02 wt% GO1 − C5 reached up to 0.8094, and the crystallization peak temperature was increased by 6.7°C compared with that of pure iPP. Meanwhile, the impact strength, tensile strength and heat deflection temperature of iPP nucleated with 0.02 wt% GO1 − C5 increased by almost 45.86%, 2.03% and 7.7°C, respectively. The iPP nucleated with GO1 − C5 obtained a balance between stiffness and toughness and the thermo-mechanical property of nucleated iPP was improved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 9
·2458-2467
·
IF 2.162
Zhongwei Chen,Tingting Chen,Yuan Yu,Qingwu Zhang,Zhiquan Chen,Juncheng Jiang
Metal-organic framework MIL-53 (Fe)@C/graphite carbon nitride hybrid (MFeCN), a novel flame retardant, was synthesized by hydrothermal reaction and subsequently added into unsaturated polyester resin (UPR). The structure, morphology, and thermal stability of MFeCN were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and thermogravimetric analysis (TG). The thermal stability and flammability of the UPR composites were characterized by TG and cone calorimeter tests (CCT). The results of CCT demonstrated that the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), and total smoke production (TSP) of UPR/MFeCN-4 were reduced by 39.8%, 10.2%, 33.3%, and 14.5%, respectively, comparing with UPR. The results of TG and CCT indicated that MFeCN could improve the thermal stability, flame retardancy, and smoke suppression properties of the UPR composites. The residues after CCT were then characterized by laser Raman spectroscopy (LRS), XPS, and SEM. Finally, based on the above experimental results and analysis, the flame retardancy mechanism of MFeCN was proposed.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3701-3713
·
IF 3.665
Jingyuan Hu,Chunhong Wang,Jinyue Dai,Na Teng,Shuaipeng Wang,Liyue Zhang,Yaming Jiang,Xiaoqing Liu
Generally, high-performance epoxy resins, which are derived from aromatic compounds have two major disadvantages of yellowing and brittleness, and thus it presently remains a challenge for the facile synthesis of epoxy resin with excellent ultraviolet resistance and superior strength and toughness. Herein, a novel bio-based epoxy resin diglycidyl ester of camphoric acid (DGECA) was synthesized from the renewable camphoric acid via an efficient and scalable route. The chemical structure of DGECA was carefully characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR), and mass spectrometry before being cured with methylhexahydrophthalic anhydride (MHHPA). Compared with the cured diglycidyl ether of bisphenol A (DGEBA)/MHHPA, the cured DGECA/MHHPA system achieved 11.5%, 16.7%, and 109.4% increment in flexural strength (126 MPa vs. 113 MPa), modulus (2.8 GPa vs. 2.4 GPa), and impact strength (6.7 kJ/m 2 vs. 3.2 kJ/m 2 ), respectively. Moreover, cured DGECA exhibited extremely lower ultraviolet absorption (0.038A) and better ultraviolet resistance than that of cured DGEBA. This work provides a new strategy to synthesize epoxy resin with excellent ultraviolet resistance and high toughness by using the unique structure of renewable feedstock.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2016
·Vol. 27
·期 10
·1376-1382
·
IF 1.823
Naipu He,Yue Wang,Zhenwu Lu
The temperature-responsive poly (N, N-diethylacrylamide) (pDEAAm) with narrower molecular weight distribution was prepared by the atom transfer radical polymerization and characterized by 1 HNMR and gel permeation chromatography. The temperature-responsive “tadpole-shaped” BSA–pDEAAm hybrids were fabricated via a free Cys-34 residue of bovine serum albumin (BSA) site specifically binding to the end group disulfide bonds of pDEAAm and characterized by native-polyacrylamide gel electrophoresis (Native-PAGE) and matrix-assisted laser desorption/ionization time of flight mass spectrometry. Their temperature-responsive behaviors were measured by ultraviolet-visible spectra (UV-Vis). The lower critical solution temperature (LCST) of the pDEAAm was identified as 28°C, and the LCST of BSA–pDEAAm hybrids was identified as 31°C. The morphologies of BSA–pDEAAm hybrids self-assembled in the aqueous solutions with two different temperatures at 25 °C and 40°C were investigated by transmission electron microscopy. Below the LCST of BSA–pDEAAm hybrids, the separate spherical nanoparticles were observed. In contrast, bundles and clusters were observed above the LCST of BSA–pDEAAm hybrids. The results suggested that the self-assembly morphology of BSA–pDEAAm hybrids depended upon the pDEAAm block in BSA–pDEAAm hybrids, and the morphology transitions were effected by the LCST of BSA–pDEAAm hybrids. It would be expected to be used in biomedicine and materials science. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2843-2855
·
IF 3.665
Pengfei Ji,Yihua Cui,Dongyue Liu,Tianlong Zhang,Jipeng Lv
A novel functionalized graphene oxide (F-GO) decorated with a double-phosphaphenanthrene structure was fabricated using a covalent modification method. The F-GO with Bi-DOPO groups then was introduced into the epoxy matrix as a highly effective flame retardant. The Flame retardant epoxy resins (FREP) containing F-GO exhibited superior fire-resistant performance with extremely low loading. When the content of F-GO was 1 wt%, the limiting oxygen index value of the FREP was increased from 19.9% to 30.8%, and the total heat release and the peak heat release rate was decreased by 44.0% and 55.5%, respectively. Meanwhile, the tensile and impact tests results indicated that the mechanical properties of the epoxy resins were improved with the addition of F-GO. Furthermore, the thermogravimetric analysis showed that F-GO greatly increased the char-yield of the cured FREP. Based on the char analyses of SEM images, F-GO was conducive to form a more protective char barrier for FREP during combustion. F-GO developed a synergistic flame-retardant effect of the Bi-DOPO derivative and graphene layer structures on epoxy resins.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 11
·2492-2503
·
IF 2.578
Fuqiang Zhou,Lucheng Qi,Xuelian He
A series of different molecular weight Polycyclooctene(PCOE) rubber were synthesized via ROMP with G 2 catalyst and Iso-polypropylene (iPP), PCOE and high density polyethylene (HDPE) blends were prepared by micro twin-screw extruder. The effects of PCOE molecular weight and content were investigated by studying the thermal, rheological and mechanical properties of the blends. We observed that the low molecular weight PCOE promoted the dispersion of HDPE, and as the molecular weight and content of PCOE rising, PCOE encapsulated HDPE particles entirely to form a connected core-shell network structure in PP matrix and a certain degree of micro-crosslinked structure which connected the PCOE ‘shell’. Micrographs of the fracture surfaces support the finding that PCOE promoted a finer dispersion and improved the morphological stability of the ternary blends as a compatibillizer. The increasing molecular weight of PCOE enhanced the molecular chains entanglement of the blends resulting in an increase on blends viscosity. The interfacial adhesion of PP/PCOE/HDPE ternary blends improved significantly as PCOE molecular weight increased from 12 kg/mol to 270 kg/mol. The impact strength of the PP/PCOE/HDPE blends increased by 3 times as compared with PP/HDPE blends owing to the addition of 15 wt% HDPE and 15 wt% PCOE( M n = 270 kg/mol).
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3532-3539
·
IF 3.348
Yang Lv,Xiaohu Chen,Peicong Zhang,Shiyi Zhou,Junfeng Li,Ruqing Bai,Li Wang
The preparation of a porous shape memory hydrogel with excellent shape changing performance is a hot research topic at present. In this paper, hydrophilic hydrogels were synthesized using polypropylene glycol (PPG) and polyethylene glycol (PEG) as raw materials and hexamethylene diisocyanate (HDI) as crosslinking agent. The pore structures were developed by gas foaming and salt leaching methods. The results showed that the hydrophilicity of hydrogel and the swelling rate in phosphate buffered saline (PBS) increased with the increase of PEG mass fraction, the shape changing performance of hydrogels varied as well with high shape recovery rate ≥90%. The recovery speed in aqueous environment was faster than in the air. After embedding hydroxyapatite (HA) particles, the materials exhibited appropriate degradable properties and good in vitro mineralization performance. Therefore, the obtained PPG/PEG system hydrogels is expected to become an ideal platform for tissue engineering and other applications in the biomedical field.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 7
·1644-1655
·
IF 2.162
Fei Zhong,Pingquan Wang,Yi He,Chunlin Chen,Hongjie Li,Hao Yu,Jingyu Chen
Graphene oxide (GO) has triggered significant attention as a new type of self-assembly membrane material. However, the low filtration flux and unstable performance of GO membrane limit its practical application. Hence, in this work, layered double hydroxides (LDHs), as a 2D material with double-layer channel structure and positive electricity, were self-assembled with GO at weight ratio of 7:3 by electrostatic interaction. Then, the GO/LDH hybrids combined with polydopamine (PDA) to obtain stable and high-flux GO-based membranes through vacuum filtration and the structure and morphology of as-prepared samples were characterized by FT-IR, XRD, XPS, and SEM. Furthermore, the separation performance and surface electronegativity of membranes were tested via pure water flux, rejection efficiency, recycle experiments, and zeta potential. Results revealed that the stability and flux of composite membrane were enhanced significantly compared with neat GO-based membrane. Further, the dye rejection rate of methylene blue (MB) is higher than Congo red (CR) and rhodamine B (Rh B) and reached to 99.8%.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3458-3473
·
IF 3.665
Xiaofeng Chi,Muxuan Li,Mei Liang,Yang Chen,Huawei Zou
A method of using modified epoxy resin (PEG-E51) and graphene oxide (GO) as sizing agent in different pH has been proposed and applied to improve the interfacial interactions and bonding of carbon fiber (CF) reinforced epoxy resin-based (EP) composites. The PEG-E51 and GO complex sizing in different pH is prepared and then coated on CF surfaces homogeneously. The sizing layer forms on the fiber surfaces, and multiple GO sheets are introduced successfully surrounding the CFs. The surface morphologies of CFs change distinctly with different pH. The interfacial shear strength increases from 51.36 MPa for bare fiber-reinforced EP composites to 66.62 MPa for composites reinforced by CFs coated with GO only. However, a significant improvement is achieved when the pH is adjusted to 10, making the interfacial shear strength grow up to 77.23 MPa. Furthermore, scanning electron microscopy results and interlaminar shear strength test are in agreement with each other, suggesting better interface bonding of composites by regulating pH of PEG-E51 and GO complex sizing. Besides, the interfacial interaction mechanism in CF reinforced composites is also explored, that is, the positive effects of roughness and specific surface area in complex interfacial layers lead to the improvement of interfacial properties.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）