POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 5
·1496-1511
·
IF 3.348
Wenduo Wang,Zhengzhou Wang
Epoxy resin (EP) has featured many industrial and practical applications, but was plagued by its inherent flammability. Herein, a hybrid flame retardant (mSiO 2 @TETP) was fabricated by in-situ immobilizing tin ethylenediamine tetramethylene phosphonate (TETP) on the mesoporous silica (mSiO 2 ) surface, and was used to prepare mechanical-robust, flame-retardant, and thermal-resistant EP composites. It is found that the introduction of only 1.0 wt% mSiO 2 @TETP into EP leads to a 20.5%, 19.7%, and 12.8% incremental tensile modulus, tensile strength, and impact strength, respectively. The EP composite with 5.0 wt% mSiO 2 @TETP (EP/mSiO 2 @TETP-5) succeeds to the UL-94 V-0 grade, with a limiting oxygen index value of 29.0%. And the peak heat release rate, total heat release, peak smoke production rate, total smoke release, and peak CO production rate of EP/mSiO 2 @TETP-5 decrease by 54.0%, 52.1%, 53.9%, 51.1%, and 55.7%, respectively in contrast with the values of pure EP. Moreover, the introduction of mSiO 2 @TETP results in an improvement in both the charring capacity and the initial thermal resistance (an increment in the glass transition temperature) of EP.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 8
·2542-2551
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IF 3.348
Li Fan,Ke Cao,Huan Hu,Jiajun Ma,Qiuxia Peng,Xian Li,Yawen Huang,Junxiao Yang
UV-curable resins with low dielectric constant can be processed or patterned to form required shapes, making them highly applicable to special fields. In our previous study, UV-curable siloxane-benzocyclobutene resins were synthesized, but their dielectric constants were relatively high. In this work, silylbutylene-benzocyclobutene oligomers (ADM-PBSC) were synthesized by acyclic diene metathesis (ADMET) polymerization of 1,1-dibutenylsilacyclobutane monomers with benzocyclobutene terminated groups. In this way, siloxane moieties were replaced by silylbutylene groups to further reduce dielectric constant while preserving UV curable properties. The UV/thermally cured ADM-PBSC exhibited good mechanical properties and high thermal stability. Furthermore, the cured resins showed low dielectric constants (2.49 at 10 MHz) and low dielectric losses (10 −3 at 10 MHz). Good comprehensive properties of ADM-PBSC may be attributed to its UV/thermally dual cross-linked structure.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 9
·2656-2666
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IF 3.348
Qian Liu,Zhe Wang,Zhiyin Sui,Tianen Shui,Song Wang
To achieve good stability of anion-exchange membranes. We report an organic–inorganic composite anion exchange membrane based on polyphenylene oxide (PPO) and 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane to improve dimensional stability and mechanical stability without affecting ionic conductivity. The successful synthesis of the membranes was confirmed by FT-IR, 1 H NMR, and EDX. The Si O Si three-dimensional network cross-linked structure was formed inside the anion-exchange membranes by added inorganic fillers. It suppressed the swelling behavior of the membrane after water uptake, with water uptake rate of 48.2%–55.6% and swelling rate of 3.1%–14.2%. It improved the mechanical strength of the membranes with tensile strength of 33.5–37.8 MPa as the ratio of the membrane structure varied. Meanwhile, the flexible chain segments in the polymer structure contributed to the formation of microscopic phase separation structures, and the constructed ion-conducting channels enabled QPPO-Si-5 to reach the highest hydroxide ion conductivity of 78.7 mS/cm at 80°C (ion exchange capacity [IEC] value of 1.2 mmol/g). QPPO-Si-1 exhibited better long-term chemical stability, retaining 48.3% of the initial conductivity (30.8 mS/cm) after 600 h of alkali stability testing at 80°C in 1 M KOH solution. In conclusion, the results of this study provide a facile synthetic strategy with improved membrane's comprehensive performance.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 7
·2166-2175
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IF 3.348
Wenling Guo,Peng Cao,Fengli Dai,Yonggang Li,Rongmin Wang,Pengfei Song,Yufeng He
The reversible addition-fragmentation chain transfer polymerization (RAFT) is an effective method to control chain growth and regulate active centers in functional materials. Herein, a novel antibacterial material, polymer cations-adjustable porous materials (PCaPM), was successfully synthesized by RAFT and quaternization. First, using 2-(dodecylsulfanylthiocarbonylsulfanyl)-2-methylpropionic acid as the chain transfer agent of RAFT, methyl methacrylate and 2-(dimethylamino)ethyl methacrylate as comonomers, and ethylene dimethacrylate as crosslinking agent, the light-yellow crosslinked block copolymer (PM-PDE), was synthesized by RAFT polymerization. Second, a series of porous materials (PCaPM) were obtained by quaternization of PM-PDE with alternative alkyl halide and swelling effects in water. The composition and structure of PM-PDE and PCaPM were characterized by scanning electron microscope, energy dispersive spectrometer, Fourier transform infrared spectra, 1 H-NMR, Brunauer–Emmett–Teller, and X-ray photoelectron spectroscopy. Their antibacterial properties were also evaluated against Staphylococcus aureus , Escherichia coli , and Valsa mali . Remarkably, PCaPM, containing tertiary amine and possessing high porosity and large specific surface area, presented excellent antibacterial activity. Hence, the resultant PCaPM exhibited excellent antibacterial activity due to the quaternary ammonium salts groups, which has great prospects in application in medical treatment, agricultural antibiotic, emulator, and sewage treatment.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 5
·1685-1694
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IF 3.348
Huailiang Hui,Yanpeng Li,Yu Feng,Jialong Li,He Zhao,Congcong Zhu,Dong Yue,Jinghua Yin,Xiaoxu Liu
Polymer-based nanodielectrics are widely used in microelectronics, aerospace and electrical insulation fields because of their excellent insulation and mechanical properties, but the strategies and mechanisms to improve their insulation strength need to be further studied. Herein, introducing MOFs (UiO-66) particles into polyimide (PI) matrix obtained the unexpected discovery that MOFs with 3D porous structure did not degrade the insulation strength and mechanical stretching of composite films, conversely, remarkably increased the breakdown strength ( E b ) and mechanical strength at low doping concentration. With only 1 wt% doped of UiO-66, the maximum E b of UiO-66/PI composite film is 458.6 kV/mm, which is about 64% higher than PI (279.8 kV/mm). To study the mechanism of performance improvement, the interface structure was characterized by synchrotron radiation small-angle X-ray scattering, and the interface influence factor is introduced to modify the classical dielectric model. It was found that the hydroxyl groups on UiO-66 can form hydrogen bonds with the PI molecular chain, and this strong interaction at the interface is the main reason for the performance improvement of low-content doped composites. This study provides a strategy for improving the insulation properties of composites at low doping and offers some insights into the application of MOFs in high performance dielectrics.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 7
·2374-2385
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IF 3.348
Qinyong Liu,Huawei Wang,Hefu Li,Jun Sun,Xiaoyu Gu,Sheng Zhang
To enhance the flame retardancy and smoke suppression of thermoplastic polyurethane (TPU), a novel flame retardant ZIF-67@GO was fabricated by hybridization of zeolitic imidazolate framework-67 (ZIF-67) and graphene oxide (GO). The flame retardancy of TPU sample was significantly enhanced by the presence of 6.5 wt% ammonium polyphosphate (APP) and 0.5 wt% ZIF-67@GO: the limit oxygen index (LOI) reached 27.4% and UL-94 grade passed V-0, the peak heat release rate (pHRR) and peak smoke production rate (pSPR) values was dropped by 81.2% and 48.7%, respectively, comparing with that of the control sample. The burning time of the flame-retardant TPU sample was prolonged to more than 600 s from 200 s of the control TPU sample during the cone test. Additionally, the tensile strength and elongation ratio of the flame-retardant TPU reached 18.3 MPa and 1026.3%, respectively, which meet the requirement in most industrial applications. This work provides useful information to produce flame retardant synergists for polymeric composites.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 8
·2393-2403
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IF 3.348
Wenxue Lou,Zhuding Dai,Pingping Jiang,Pingbo Zhang,Yanmin Bao,Xuewen Gao,Jialiang Xia,Agus Haryono
A series of soybean oil-based polyols were synthesized via the reaction between epoxidized soybean oil and 1,3-propanediol, trimethylolpropane and xylitol, respectively. The aqueous polyurethanes were synthesized by prepared soybean oil-based polyols. The effect of hydroxyl value of soybean oil-based polyols on the mechanical, thermal, hydrophobic properties of the aqueous polyurethane films were also investigated. The results showed that the OH value of polyol increased, the T g of aqueous polyurethane films increased from 30.04 to 88.28 °C and the water contact angle of materials improved from 80.80° to 98.20°. Besides, water absorption reduced from 40.25% to 2.40%. Also, all samples were placed in the 1 wt% sodium hydroxide solution at 45 °C to test the degradation behaviors. After 24 h, the results demonstrated that aqueous polyurethane synthesized by the highest hydroxyl value(251.00mgKOH/g)polyol had the lowest degradation rate(7.10%). Finally, the mechanical properties and morphology of the aqueous polyurethane film after degradation were investigated, which proved that the hydroxyl value affected the mechanical properties and morphology of the aqueous polyurethane film after degradation.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 1
·238-251
·
IF 3.348
Wenjie Diao,Kunxin Wang,Enxiang Jiao,Hui Yang,Zhao Li,Kun Wu,Jun Shi
Black phosphorus (BP) has been attractive for many research groups as its promising properties. However, the poor air stability of BP has limited its practical applications. To simultaneously address this problem and improve the flame retardancy of BP in epoxy resin (EP), a surface coordination strategy was proposed. Herein, a titanium ligand (denoted as TiL 4 ) was designed to coordinate BP nanosheets, which can occupy the lone pair electrons of BP. The Ti–P coordination contributed to the improvement of ambient stability of BP. The serious degradation was observed from pure BP owing to the oxidation. Whereas, the surface coordination can impede the ambient degradation rate of BP by 74.07%. With the addition of 1.5 wt% TiL 4 @BP, the char yield of EP nanocomposites was increased by 20.55% due to the catalytic charring effect of TiL 4 @BP. The incorporation of 1.5 wt% TiL 4 @BP can reduce the peak of heat release rate and total heat release values of EP by 29.41% and 23.32%. The EP/TiL 4 @BP 1.5 also can pass the UL-94 V-0 rating, and its value of limiting oxygen index was enhanced by 13.60%. The improvement in the flame retardancy of BP in EP can be largely ascribed to synergistic catalytic charring effects between BP and TiL 4 . The condense and compact char layer can act as a physical barrier to restrict the exchange of pyrolytic products and the transfer of heat. In addition, the free radical quenching effect of BP nanosheets also accounted for the excellent flame retardant performance of EP. This work proposed a reference for synchronically obtaining the improvement for the air stability and flame retardant performance of BP.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3418-3429
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IF 3.348
Wei Liu,Jianping Ding,Yukun Chen
Thermoplastic vulcanizates (TPVs) with more features and functions are able to find broader applications, which is increasingly desired in our daily lives. However, great challenges were facing to develop novel TPVs with integrated properties such as reinforcement, recycling, and shape memory. Herein, we report a simple and effective route to prepare mechanically robust, recyclable and shape memory-epoxidized natural rubber (ENR)/polylactic acid (PLA) TPVs by employing a tailored cross-linker (FDP) containing triple dynamic covalent bonds instead of conventional cross-linkers. The ENR phase in ENR/PLA TPVs evolved into a regular continuous phase and PLA was grafted onto ENR chain segments through FDP. The TPVs exhibited a tensile behavior of classical elastomers rather than that of plastics, with a tensile strength of 7.8 MPa and elongation at break of 174%, increased by 1.5 times and 2.9 times, respectively as compared to the traditional TPVs vulcanized by peroxide. The topology rearrangement of the cross-linked ENR networks in the TPVs can be accomplished at high temperatures. Furthermore, its regular phase structure also bestowed an excellent shape memory ability on the TPVs. This work is promising to provide a new design idea for the development of high-performance TPVs using readily available raw materials.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 12
·4302-4316
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IF 3.348
Yaxuan Wang,Tingting Feng,Junxiu Piao,Jinyong Ren,Mingyu Ou,Yaofei Wang,Richeng Lian,Jiahui Cui,Haocun Guan,Chuanmei Jiao,Xilei Chen
In this article, flame-retardant cotton fabric was prepared by a step-by-step dip-coating method, in which flame retardants were introduced onto the surface of the cotton fabric by hydrogen bonding association and surface grafting reaction. First, the epichlorohydrin-modified aramid nanofibers (AEP) were accumulated onto the surface of cotton fabric (Cot/AEP) through hydrogen bond association. Subsequently, the ionic liquid (IL) was grafted onto the surface of AEP to obtain Cot/AEP/IL. The fire safe performance of cotton fabrics was investigated by the limiting oxygen index test (LOI), vertical flammability test (VFT), and cone calorimeter test (CCT), and so forth. The LOI value of Cot/AEP/IL was as high as 29.5%. The VFT results showed that Cot/AEP/IL was self-extinguishing rather than ignited, leaving a char length of 111 mm. The CCT results demonstrated that the peak heat release rate and total heat release of Cot/AEP/IL decreased by 42.5% and 58.8% compared with untreated cotton fabrics, respectively. The TG test showed that Cot/AEP/IL had more residues left than untreated cotton under both N 2 and air atmospheres. The presence of phosphorus enables the cotton fabric to generate an aromatic phosphor carbonaceous structure during the combustion process. In addition, the tensile strength of cotton fabric was tested. After the introduction of AEP/IL, the average tensile strength value of untreated cotton improved from 129 to 167 N in the warp direction and 125–155 N in the weft direction. In summary, the introduction of AEP/IL improved both the flame-retardant and mechanical properties of the cotton fabric significantly.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3368-3375
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IF 3.348
Na Li,Sha Wu,Dan Luo,Guangming Liang,Yulong Xiao,Lei Xu,Rui Wang,Yao Xiao,Ping He
Carbon dots (CDs) exhibit vivid photoluminescence in solutions, but show no or weak photoluminescent emissions in solid state. In this paper, we prepared a polyurethane (PU)/CD composite with solid-state fluorescence under ultraviolet (UV) irradiation by anchoring oil-soluble CDs in a crosslinked PU matrix through chemical reaction. This polymer composite has high robustness, transmittance, and organic solvent resistance, as well as good stretching ability. Interestingly, since the chemical reaction between the CDs and the PU matrix changes the UV absorption feature of the CDs, the PU/CD composite has blue (near 405 nm), cyan (near 470 nm), and green (near 495 nm) fluorescent emissions, even though the CD solution just possesses green (near 530 nm) fluorescent emissions. This PU/CD composite shows the possibility of application in optoelectronic devices.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 12
·4062-4071
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IF 3.348
Tianliang Dai,Zhuofan Qin,Shuoshuo Wang,Lina Wang,Juming Yao,Guocheng Zhu,Baochun Guo,Jiri Militky,Mohanapriya Venkataraman,Ming Zhang
Ordinary packaging film only has the functions of storing food and transporting food, while the external environment can affect the storage period of food. In this study, a common degradable material, polylactic acid (PLA), was chosen as the base material, and the material was endowed with antibacterial function by adding curcumin (Cur). Coaxial electrostatic spinning technology has a unique advantage in the preparation of core-sheath structured fibers, and a PLA/Cur/n-octadecane (OD) phase change thermoregulation fiber was prepared by selecting OD as the core material, which gives the fiber film thermoregulation function. The fiber structure, mechanical properties, and thermal properties were characterized. The antibacterial activity of the composite films against Escherichia coli and Staphylococcus aureus was investigated. The temperature regulation function of the composite film was evaluated, and the unique core-sheath structure endowed the fiber film with a temperature regulation function. The storage of bananas was studied in which to explore the effect on food preservation. The composite films showed excellent bactericidal as well as antioxidant properties and successfully delayed the warming phenomenon.
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高影响因子
危险品化学品经营许可证（带存储）