POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 9
·2020-2030
·
IF 2.578
Shijun Long,Di Qiu,Ren Long,Xun Li,Hanyu Chen,Yiwan Huang,Xuefeng Li
In order to improve the performance of inorganic/organic composites, aluminum trihydroxide (ATH) core composites with a styrene-ethylene-butadiene-styrene block copolymer grafted with maleic anhydride (MAH- g -SEBS) shell phase, and P-N flame retardant as a synergistic agent, were prepared through an interface design. The effects of polyethylene glycol (PEG) content on the interfacial interaction, flame retardancy, thermal properties, and mechanical properties of high-density polyethylene (HDPE)/ATH composites were investigated by small angle X-ray diffraction, rotational rheometer, limiting oxygen index, thermogravimetric analysis (TGA), and tensile testing. The ATH synergistic effects of P-N flame-retardant improved the combustion performance of HDPE/ATH/PEG(3%)/MAH- g -SEBS/P-N (abbreviated as HDPE/MH3/M- g -S/P-N) composite by forming more carbon layer, increased the elongation at break from 21% to 558% compared to HDPE/ATH, and increased the interface thickness from 0.447 to 0.891 nm. SEM results support the compatibility of ATH with HDPE increased and the interfacial effect was enhanced. TGA showed the maximum decomposition temperature of the two stages and the yield of the residue at high temperature increased first and then decreased with the increase of PEG content. Rheological behavior showed the storage modulus, complex viscosity, and the relaxation time initially increased and then decreased with the increase of PEG content indicating PEG, M- g -S, and ATH powder gradually formed a partial coating, then a full coating, and finally an over-coated core-shell structured model.
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
·
2022
·Vol. 33
·期 6
·1898-1905
·
IF 3.348
Datong Wu,Xue Cheng,Tianze Zhang,Hong Gao
With the development of technology, life is full of electromagnetic pollution; therefore we need to shield the electromagnetic signals that are undesirable and harmful to us. In this work, polypyrrole (PPy)/polydopamine (PDA)/Ti 3 C 2 T x composites were successfully prepared for electromagnetic interference shielding applications by a simple polymerization method and mixing process. We investigated the electrical conductivity, thermal properties, electromagnetic interference shielding effect (EMI SE), and its EMI attenuation mechanism of PPy/PDA/Ti 3 C 2 T x composites. By adjusting the content of Ti 3 C 2 T x in the PPy/PDA/Ti 3 C 2 T x composites (from 0 to 12 vol%), the conductivity of the composites increased considerably from 34.6 to 884.1 S m −1 , and the maximum EMI SE of the composites in K u -band varied accordingly from 4.30 to 21.82 dB. Additionally, the thermal stability of the PPy/PDA/Ti 3 C 2 T x (12 vol%) composite was improved due to the addition of Ti 3 C 2 T x and PDA, with a change in mass loss from 59.25% to 29.34% at 900°C. These results highlight that the investigated PPy/PDA/Ti 3 C 2 T x composites are promising materials for EMI shielding.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 8
·1959-1967
·
IF 2.162
Wenwen Guo,Xin Wang,Ying Pan,Wei Cai,Weiyi Xing,Lei Song,Yuan Hu
Graphene-polyaniline/nickel hydroxide ternary hybrid (RGO-PANI/Ni(OH) 2 ) was synthesized and incorporated into epoxy resin (EP) to improve the fire retardant property. Thermogravimetric analysis results showed that the RGO-PANI/Ni(OH) 2 nanohybrid could catalyze the thermal degradation of epoxy matrix that was essential to trigger the char formation. The char yield of the RGO-PANI/Ni(OH) 2 /EP composite was improved compared with that of the samples with graphene and polyaniline only. With 3.0-wt% RGO-PANI/Ni(OH) 2 , significant reduction in peak heat release rate (40%) and peak smoke production rate (36%) was observed in the cone calorimeter tests. Thermogravimetric analysis/infrared spectrometry (TG-IR) results indicated that the flammable volatiles of the RGO-PANI/Ni(OH) 2 /EP composite was reduced compared with those of the EP and RGO-PANI/EP. The superior flame retardant and smoke suppressant behaviors of the RGO-PANI/Ni(OH) 2 nanohybrid over RGO-PANI were attributed to the combination of good barrier effect of graphene with catalytic ability of char formation of PANI and metal hydroxide.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2908-2915
·
IF 3.665
Shuai Wen,Qiang Liu,Wentian Liang
The linear benzyl chlorine-free poly(4-acetoxystyrene) (PSTO) with low polydispersity ( M w / M n = 1.3) is obtained through anisole quenching of the living polymerization of 4-acetoxystyrene initiated with the St–Cl/SnCl 4 /n-Bu 4 NBr system in CH 2 Cl 2 . The alkylation reaction rate increases with increasing anisole concentration and temperature. With a 4-fold excess of anisole over the initiator, end-chlorine groups are completely capped by anisole in 30 minutes at −15°C through adding extra SnCl 4 prior to the alkylation reaction. In addition, by using 2-methylanisole and 2,6-dimethylanisole as capping agents, it is verified that both para- and ortho-positions substitution of living PSTO cations to the anisole occur during alkylation reactions.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2632-2642
·
IF 2.137
Wen Liu,Xiao Yang,Na Li,Guanghui Xi,Mingshan Wang,Bin Liang,Yakai Feng,Hao Chen,Changcan Shi,Wenzhong Li
Efficient hemorrhage control is of extreme importance to decrease mortality rates arising from traumatic bleeding. However, traditional hemostatic agents are limited to unsatisfied biocompatibility, inconvenient usage, and high cost. To this end, we have devised a novel hemostatic microsphere from chitosan and gelatin by using appropriate amount of genipin as a crosslinker. The performance of these Cs/Gel MPs was evaluated with experiments in vitro and in vivo. Results in vitro showed that the best hemostatic efficacy was achieved by Cs/Gel-0.75 MPs (the mass fraction of genipin in Cs/Gel mixture is 8.6 × 10 −6 ). Skin laceration model indicated that the hemostatic time of Cs/Gel-0.75 MPs was within 12 seconds, which has been significantly shortened in comparison with commercial available products. Moreover, cytocompatibility results displayed that Cs/Gel-0.75 MPs caused no obvious cytotoxicity even at the high concentration of 40 μg/ml. Cs/Gel-0.75 MPs also possess satisfactory fluid absorption ratio and low hemolysis. Therefore, these Cs/Gel-0.75 MPs are promising candidates for further surgical wound hemostatic agent.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3279-3285
·
IF 3.348
Jiaji Cheng,Yuqi Liu,Moyun Kang,Shaoshuai Niu,Yapeng Wang,Yu Guan,Feng Zhang
Due to the energy crisis and environmental pollution, the research on energy-efficient building has increasingly attracted attention. The phase change materials (PCMs) play a vital role in increasing the energy utilization efficiency. In order to protect the PCMs from leakage during phase change process, the melamine sponge (MS) and modified melamine sponge (MMS) are considered as the frameworks. The leakage rate of MS and MMS sample were compared. The thermal and fire behavior was investigated by small room model, infrared thermal imager and cone calorimeter. The results show that the leakage rate of MS is much higher than that of MMS. On the condition of the same percentage of PCMs, MMS sample has better temperature control performance. The MS sample releases heat much faster and more than MMS sample. While MMS plays a role in inhibiting ignition.
研究领域:
建筑材料
·
能源工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2010
·Vol. 23
·期 1
·114-121
·
IF 1.532
Huan Liu,Kai Xu,Hualun Cai,Jiangxun Su,Xin Liu,Zien Fu,Mingcai Chen
Through addition reaction of Schiff-base terephthalylidene-bis-( p -aminophenol) ( DP-1 ) and diethyl phosphite (DEP), a novel phosphorus-modified epoxy, 4,4'-diglycidyl-(terephthalylidene-bis-( p -aminophenol))diphosphonate ether ( EP-2 ), was obtained. An modification reaction between EP-2 and DP-1 resulted in an epoxy compound, EP-3 , possessing both phosphonate groups and CN imine groups. The structure of EP-2 was characterized by Fourier transform infrared (FTIR), elemental analysis (EA), 1 H, 13 C, and 31 P NMR analyses. The thermal properties of phosphorus-modified epoxies cured with 4,4'-diaminodiphenylmethane (MDA) and 4,4'-diaminodiphenyl ether (DDE) were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The activation energies of dynamic thermal degradation ( E d ) were calculated using Kissinger and Ozawa's methods. The thermal degradation mechanism was characterized using thermogravimetric analysis/infrared spectrometry (TG-IR). In addition, the flame retardancy of phosphorus-modified epoxy thermosets was evaluated using limiting oxygen index (LOI) and UL-94 vertical test methods. Via an ingenious design, phosphonate groups were successfully introduced into the backbone of the epoxies; the flame retardancy of phosphorus-modified epoxy thermosets was distinctly improved. Due to incorporation of CN imine group, the phosphorus-modified epoxy thermosets exhibited high thermal stabilities; the values of glass-transition temperatures ( T g s) were about 201–210°C, the values of E d were about 220–490 kJ/mol and char yields at 700°C were 49–53% in nitrogen and 45–50% in air. These results showed an improvement in the thermal properties of phosphorus-modified epoxy by the incorporation of CN imine groups. Copyright © 2010 John Wiley & Sons, Ltd.
研究领域:
高分子科学
·
材料化学
·
阻燃材料
·
热分析
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 7
·1663-1672
·
IF 2.162
Jinhui Liu,Di Li,Zhe Fu,Jieting Geng,Jing Hua
The development of silica-filling elastomers with high mechanical performance and good processability is still a great challenge. In this study, we fabricated siloxane-grafted atactic 1,2-polybutadiene (1,2-PB) rubber through grafting poly(1,3-butadiene)-block-(dimethylsiloxane) (PB-b-PDMS) onto 1,2-PB molecular chains by coordination polymerization using a molybdenum (Mo)-based catalyst system. The PB-b-PDMS with active double bonds was synthesized by anionic polymerization. Fourier transform infrared analysis (FTIR), elementary analysis, and GPC-MALLS-viscometer analyses verified the incorporation of PB-b-PDMS and the grafting structure in the resulting polymer. Scanning electron microscope (SEM), bound rubber testing, and dynamic mechanical analysis demonstrated that the graft-modification with PB-b-PDMS improved silica dispersity in the 1,2-PB matrix because the incorporation of siloxane groups provided stronger interfacial interaction with silica. Meanwhile, the graft-modified 1,2-PB exhibited lower Mooney viscosity, higher tensile strength, and lower heat build-up than unmodified 1,2-PB. This concept provides novel inspiration for the preparation of advanced rubber with promoted silica compatibility and mechanical performance.
研究领域:
高分子科学
·
材料工程
·
橡胶技术
·
纳米复合材料
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 12
·e70000
·
IF 3.1
Hangqi Zhao,Wenrui Yao,Guoying Liu,Kang Chen,Mengyao Liu,Ce Sun,Haiyan Tan,Jun Shen,Yanhua Zhang
Starch adhesives are often used in the plywood sector. They are sustainable, formaldehyde-free, and biodegradable. However, the problems of poor gluing strength and hydrophobicity need to be overcome. In this study, natural starch was oxidized by sodium persulfate to obtain oxidized starch. Oxidized starch adhesive (SSA-15%) was crosslinked with PVA. The results show that the dry and wet shear strength of the prepared oxidized starch adhesive (SSA-15%) can reach 2.95 MPa and 1.31 MPa, which is 163% and 120% higher than that of the natural starch adhesive. Sodium persulfate causes the large number of hydrophilic hydroxyl groups in starch to oxidize directly to carboxyl groups, improving the hydrophobicity of starch. The hydroxyl group present in oxidized starch interacts with the secondary hydroxyl group in PVA to form a hydrogen bond. This interaction enhances the adhesive bonding performance, resulting in improved mechanical properties and increased bonding strength of the final products, while also contributing to the formation of a more robust network structure. The study showed that the oxidized adhesive has good hydrophobicity and storage thermal stability. It is a simple and green biomass wood adhesive, which provides theoretical support for the promotion and application of aldehyde-free adhesives.
研究领域:
材料科学
·
生物质化学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 6
·e6481
·
IF 3.1
Yuquan Chen,Bin Ren,Xuemei Li,Suhan Rao,Zhangyi Guo,Yufei Li,Ying Huang,Ming Kang,Xiuyun Li
Traditional epoxy resins are made from non-renewable fossil resources, which are difficult to reprocess and recycle, and their flammability makes them unsafe during use. In this experiment, an epoxy resin containing Schiff base (TA-VAN-EP) was synthesized successfully with biomass-derived raw materials. This new material not only had favorable mechanical properties but also had good flame retardancy and degradation properties. The chemical structure of TA-VAN-EP was characterized by Fourier transform infrared (FTIR) spectroscopy and 1 H nuclear magnetic resonance (NMR) spectroscopy. Its mechanical properties, thermal stability, flame-retardant properties, and other properties were tested. The results showed that, compared with the pure epoxy resin (EP), the mechanical properties of TA-VAN-EP were significantly improved, and the glass transition temperature ( T g ) was increased from 152°C to 190°C. Additionally, TA-VAN-EP reached a V-1 rating during the UL-94 test, and the limited oxygen index (LOI) value increased from 24.7% to 28.4%. Also, the total heat release (THR), smoke production rate (SPR), and total smoke release (TSR) decreased extremely. Moreover, TA-VAN-EP demonstrated good degradation performance under acidic conditions. In conclusion, this work provided a new idea for the production of bio-based flame-retardant epoxy resin with promising degradable abilities and mechanical properties.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2011
·Vol. 23
·期 4
·765-775
·
IF 1.776
Hualun Cai,Xiuju Zhang,Kai Xu,Huan Liu,Jiangxun Su,Xin Liu,Zien Fu,Ying Guo,Mingcai Chen
Octaphenylsilsesquioxane (PH-POSS) and octa(γ-methacryloxypropyl)silsesquioxane (MA-POSS) were successfully synthesized by hydrolytic condensation of phenyltrichlorosilane and γ-methacryloxypropyltrimethoxysilane, and characterized by Fourier transform infrared (FT-IR), 1 H and 29 Si nuclear magnetic resonance (NMR), and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrum. Morphology, degradation behavior, thermal, and mechanical properties of hybrid composites were studied by transmission electron microscopy (TEM), polarized optical microscopy (POM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), surface contact angle (SCA), tensile, and impact testing. Domains of PH-POSS and MA-POSS dispersed in the matrix with a wide size distribution in a range of 0.1–0.5 µm, while PH-POSS exhibited a preferential dispersion. Because of the possible homopolymerization of MA-POSS during the melt blending, the glass transition temperature of polycarbonate (PC)/MA-POSS composites remained nearly unchanged with respect to PC/PH-POSS composites that showed a depression of T g due to the plasticization effect. It is interesting to note that the incorporation of POSS retarded the degradation rates of PC composites and thus significantly improved the thermal stabilities. Si O fractions left during POSS degradations were a key factor governing the formation of a gel network layer on the exterior surface. This layer possessed more compact structures, higher thermal stabilities, and some thermal insulation. In addition, percentage residues at 700°C ( C 700 ) significantly increased from 10.8% to 15.8–22.1% in air. Fracture stress of two composites showed a slight improvement, and the impact strength of them decreased monotonically with the increase of POSS loading. Copyright © 2011 John Wiley & Sons, Ltd.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2011
·Vol. 23
·期 10
·1329-1334
·
IF 1.776
Nianjun Kang,Zhongjie Du,Hangquan Li,Chen Zhang
In this report, a novel phosphorus/silicon-containing reactive flame retardant, hexa(3-triglycidyloxysilylpropyl)triphosphazene (HGPP), was synthesized and characterized by Fourier transform infrared spectrometry and nuclear magnetic resonance spectra ( 1 H, 31 P, and 29 Si), respectively. To prepare cured epoxy, HGPP had been co-cured with diglycidyl ether of bisphenol-A (DGEBA) via 4,4-diaminodiphenylsulfone as a curing agent. The mechanical, thermal, and flame retardant properties of the cured epoxy were evaluated by dynamic mechanical analysis, thermogravimetric analysis, and limiting oxygen index (LOI). According to these results, it could be found that incorporation of HGPP in the cured epoxy system showed good thermal stability, high LOI values, and high char yield at high temperature. As moderate loading of HGPP in the epoxy system, its storage modulus and glass transition temperature were higher than those of neat DGEBA. Copyright © 2011 John Wiley & Sons, Ltd.
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
危险品化学品经营许可证（带存储）