JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 40
·51184
·
IF 3.125
Siyuan Jiang,Yufei Liu,Xiaoyu Zou,Min He,Kai Zhang,Guomin Xu,Shuhao Qin
The two macromolecular antioxidants, P(3,5-di-tert-butyl-4-hydroxy cinnamic acid-alt-N-phenylmaleimide) (PCN) and P(3-butene-1-yl-3,5-di-tert-butyl −4-hydroxyphenyl propionate-alt-N-phenylmaleimide) (PPN) were designed and synthesized via free radical copolymerization. The structures of the resulting PCN and PPN antioxidants were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 H NMR), and gel permeation chromatography. In addition, the effect of the two macromolecular antioxidants on the thermal oxidation aging resistance of polyamide 6 (PA6) was studied. According to the analysis of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, dynamic viscosity, and the mechanical property of PA6 and its blends, these two types of macromolecular antioxidants protected the molecular chain of PA6 from breaking, protected the crystallization of PA6 and maintained the stability of PA6 crystal form, improved the activation energy of thermal degradation and thermal stability of PA6, enhanced the strength and elasticity of PA6 and maintained the mechanical properties of PA6 during aging to a certain extent.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51191
·
IF 3.125
Tariq Aziz,Sahid Mehmood,Fazal Haq,Roh Ullah,Farman Ullah Khan,Bakhtar Ullah,Muhammad Raheel,Mudassir Iqbal,Asmat Ullah
This research article describes the results of nano-silica composites filled with different epoxy contents containing nano-SiO 2 particles from (5–25 wt%). Reinforcing hybrid composites enhance thermal and mechanical properties to achieve vital and sustainable products. Silica-based nanocomposites with high purity were prepared and used for the surface modification of nanosized silica particles. The surface structure's composition and physical properties of modified nano-SiO 2 particles were characterized through Fourier transferred infrared spectrometer, X-ray photoelectron spectroscopy, thermogravimetric analyzer, and scanning electron microscopic. Silica-based nanocomposites were prepared by incorporating of modified nano-SiO 2 as an enhancing filler. The morphology of fracture surface and dynamic mechanical properties were investigated. Results showed that the silica-based epoxy nanocomposites are bearing a long chain structure that could improve the compatibility of silica nanocomposites with epoxy resin and contribute to a better dispersion state in the matrix, which enhanced the overall performance of epoxy-cured products.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51171
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IF 3.125
Xiuju Lin,Hao Pang,Daidong Wei,Bing Liao
Herein, crosslinked polycarboxylate superplasticizers were synthesized using acrylic acid, sodium methylallyl sulfonate and methyl polyethylene glycol acrylate as monomers, and monomers that contain either ester or amide groups as crosslinking agents. The superplasticizers that were synthesized from the ester- and amide-based crosslinking agents were respectively denoted as SP-E and SP-N. In addition, a series of performance characterizations were carried out to explore the influence of different functional groups in crosslinking agents on the performance of superplasticizers. Fluidity test results showed that the dispersibility and fluidity retention of cement pastes treated with the SP-E were better than those of cement pastes treated with SP-N. Meanwhile, the viscosity of the sample containing SP-E was lower than that containing SP-N. In addition, the amount of the two superplasticizers that had become adsorbed onto the surfaces of cement particles also differed, and in this case the adsorption capacity of SP-E was greater than that of SP-N. X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy tests showed that the ester-group based SP-E superplasticizers promoted cement hydration to a greater degree than that was achieved with their amide-bearing SP-N counterparts. This study would provide valuable insight for the development of crosslinked polycarboxylate superplasticizers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51172
·
IF 3.125
Qiuye Zhang,Jingjing Wang,Luen Xu,Shi-Yu Lu,Huawei Yang,Yifan Duan,Qiang Yang,Mengfan Qiu,Chunmei Chen,Sheng Zhao,Xiaohong Liu,Hui Liu
Photothermal-enhanced chemodynamic therapy is a novel and promising strategy for effective tumor treatment. Herein, a kind of polydopamine (PDA)-based nanoplatform is reported for photothermal-enhanced chemodynamic therapy against tumor cells. PDA nanoparticles (NPs) were prepared through the self-polymerization method, which were subsequently chelated with Cu 2+ and linked with poly(ethylene glycol) (PEG) chains, finally obtaining PDA-Cu(II)-PEG NPs. The fabricated PDA-Cu(II)-PEG NPs were uniform in shape with a narrow polydispersity. They can firstly react with glutathione (GSH) to generate Cu + , inducing GSH depletion meanwhile. The formed Cu + could catalyze H 2 O 2 to produce hydroxyl radicals (˙OH) via a Fenton-like reaction. The formed PDA-Cu(II)-PEG NPs displayed good photothermal conversion efficiency and photothermal stability. They can be internalized by 4T1 cells effectively. Under near-infrared light irradiation, PDA-Cu(II)-PEG NPs can generate hyperthermia and ˙OH for photothermal/chemodynamic therapy against tumor cells.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50940
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IF 3.125
Hao-hao Ren,Peng-cheng Li,Ya-nan Wu,Jin-bo Hu,Gang Zhang,Yong-gang Yan
A series of semi-aromatic copoly(ether ether amide)s (hydroquinone (HQ) (0%)-HQ (100%)) were synthesized by 1,1-bis(4-hydroxyphenyl)-1-phenylethane (BHPPE), 1,4-benzenediol (HQ) and 1,6- N , N ′-bis(4-fuorobenzamide) hexane (BFBH) in this work. The inherent viscosities of copoly(ether ether amide)s were in the range of 0.487–0.769 dl g −1 . Following with increase of the content of HQ, the resultant polymers were converted from amorphous to crystalline. The copolymers were found to have high glass transition temperatures ( T g ) of 141.4–155.6°C and weight-loss temperature ( T 5% ) of 423.3–434.3°C. They can be hot-pressed into films with tensile strength of 63.3–87.6 MPa, and storage modulus over 0.8 GPa at about 150°C, indicating good thermal and mechanical property of the obtained copolymers. The results of rheological property showed that the copolymers had good melt flowability and thermal stability. Additionally, the introduction of HQ improved the corrosion resistance of copolymers, the obtained polymers HQ (60%), HQ (80%) and HQ (100%) exhibited better corrosion resistance than that of HQ (0%). Especially, HQ (80%) and HQ (100%) were insoluble in organic polar solvents such as DMSO, DMF because of their crystalline nature, indicating that they had potential to be applied to the corrosion-resistant materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 35
·50895
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IF 3.125
Zhihui Huang,Jiamiao Chen,Yanping Huo,Jingwei Zhao
To improve the safety and electrochemical properties of lithium ion batterie (LIB), a series of novel organic soluble poly(aryl ether ketone) (PAEK) copolymers were synthesized and used to fabricate LIB separators. The PAEK copolymers exhibited superior structural thermal stability and flame retardant, with glass transition temperature ( T g ) above 150°C, oxygen index above 30 and no thermal decomposition before 500°C. Accordingly, the fabricated separators exhibited superior dimensional stability. The mechanical properties and electrolyte uptakes of the separators, as well as the electrochemical properties of the cells assembled with the separators were affected by the morphology and porosity of the separators. The separators with sponge-like structure exhibited less electrolyte uptakes but better mechanical properties than that of the ones with finger-like structure. The cell with finger-like structure separator exhibited poorer electrochemical properties than sponge-like structure separator, which might be caused by the collapse of some finger hole during the assemble process due to its poor mechanical properties. The charge–discharge performances of the cells after treated at 150°C demonstrates that the PAEK separators could be promising candidates for high-safety LIB.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 1
·51422
·
IF 3.125
Fa Mao,Xuelai Zhang,Yongyichuan Zhang,Biao Liu,Lingyu Zheng
The main objective of this research is to characterize, via experimental analysis, the effects of thickeners on thermophysical properties of Alum (KAl[SO 4 ] 2 ·12H 2 O) as phase change material (PCM) for energy storage. Six thickeners, including sodium carboxymethyl cellulose (CMC-Na), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol, xanthan gum (XG) and methylcellulose (MC), are added in Alum. Then the thermophysical properties and the cycle stability are tested and analyzed by step cooling experiment, differential scanning calorimeter, hot disk, scanning electron microscopy, high-low temperature alternating test chamber, X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FT-IR). The results showed that the adding of 2 wt% CMC-Na, 1 wt% PAAS, 2 wt% PAM, 5 wt% XG, and 1 wt% MC to Alum can effectively reduce the subcooling of Alum while still maintaining the latent heat at a high level. After stability test with 60 melting-solidification cycles, the results indicate that Alum with 1 wt% MC has the best thermal cycle stability and has the highest latent heat (230 J/g). The latent heat is only 8.1% lower than that of pure Alum after 1 cycle, and 11.1% higher than that of pure Alum after 60 cycles. The XRD, FT-IR, and thermogravimetry results show that it has good chemical and thermal stability.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 2
·51453
·
IF 3.125
Yuanhao Ma,Rui Qin,Min Xu,Xiaolin Jiang,Yeming Sheng,Minhui Wang,Wencong Zhang,Xun Lu
The design and synthesis of high-performance polyurethane with excellent damping performance and superior mechanical property is a challenge owing to conflicting attributes of damping and mechanical performance. Herein, we innovatively introduced dynamic aromatic disulfide bonds and suitable disulfide catalysts into the system and synthesized a polyurethane elastomer with both admirable damping performance (wide damping temperature range [ tan δ ≥ 0.3] of 148°C) and excellent mechanical properties (16.8 MPa, 960%). In our design, (i) dynamic aromatic disulfide exchange reaction above room temperature is able to enhance energy dissipation and segmental mobility, thus promoting the damping performance of polyurethane; (ii) the introduced catalyst can further promote dynamic exchange of disulfide bonds above room temperature, making the chains easier to move and leading to excellent damping property. Moreover, by adjusting the chain extension coefficient, the molecular structure of the chain extender, it's easy to design the microphase separation and rigid structure of the elastomer and the system is endowed with improved mechanical strength. Owing to its outstanding properties, the elastomer has great potential to be used for practical application.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51411
·
IF 3.125
Xing-Ya Liu,Rui-Yang Xie,Tao Chen,Lei He,Ting Wang,Wang Liao,Zhi-Guo Liu,Ming-Jun Chen
Due to the condensation reaction of hydroxylated melamine molecules is possible to take place in the whole pH range, especially in acidic water medium or at high temperature, losing its water solubility. In this work, freeze drying perfectly removes water at pretty low temperature, avoiding condensation reaction of hydroxylated melamine. Therefore, a hydroxylated melamine in solid form (MOH-S) was prepared. It can be not only dissolved in water after storing for 180 days but also well dispersed in waterborne polyurethane emulsion. The addition of hydroxylated melamine significantly improves the tensile strength of polyurethane films by 170%. After soaking the films in water for 24 h, the tensile strength of WPU/30%MOH-S film lost only 6%, but 34% loss for the neat. Fourier transform infrared spectroscopy peak fitting demonstrates that the H-bonding degree of N─H in WPU/30%MOH-S film is 20.72 that is much higher than 3.33 in neat WPU. This indicates that H-bonding cross-linked structure is formed between polyurethane chains and hydroxylated melamine molecules. This work provides an effective strategy for preparing stable hydroxylated melamine and enhancing the strength of polyurethane film.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51413
·
IF 3.125
Rong Yang,Hongwei Cao,Chong Li,Guoxiang Zou,Xin Zhang,Jinchun Li
Reactive interfacial compatibilization is the most efficient way to prepare super-tough poly (lactic acid) (PLA) materials. Introducing a post-reactive group into a toughening agent that can react with PLA is the key issue. Herein, we reported a series of fully bio-based polyesters (PBSePM) synthesized with sebacic acid, diethyl malate, 1,3-propanediol, and 1,4-butanediol via transesterification in one pot. Super-tough PLA materials can be obtained by reactively blending with PBSePM in the presence of hexamethylene diisocyanate (HDI). In the processing, the side hydroxyl group of the PBSePM reacted with HDI and formed polyurethane elastomer to improve the toughness of PLA. Moreover, the in-situ formed PLA- g -PBSePM grafted copolymer enhanced the interfacial adhesion. With increasing diethyl malate moiety in PBSePM, the PBSePM phase morphology transformed from co-continuous phase structure to semi-continuous and “sea-island” phase structure. When adding 20 wt% PBSePM, all PLA/PBSePM blends have a notched impact strength higher than 53 kJ m −2 , suggested a super toughness effect. Maximum impact strength of 83 kJ m −2 was realized while the PBSePM containing 20% diethyl malate moiety. In addition, super-tough PLA materials can be achieved by only adding 15 wt% PBSePM20, exhibited a highly efficient toughening effect.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 44
·51315
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IF 3.125
Bowen Xu,Feilong Han,Xuqiang Pei,Xin Liu,Junying Zhang,Jue Cheng,Jingbo Zhao
Increasing the molecular weight of polyurethanes (PU) is an effective way to improve its mechanical properties, while, it is at the expense of sacrificing processability. Congruent modification in both mechanical and processing performances is still a challenge. Here, bis-phenol-A (BPA) derivatives, including tetrachlorobisphenol-A and tetrabromobisphenol-A, were chosen as the extender to synthesize thermoplastic PUs (TPU) containing blocked isocyanate units. This blocked isocyanate has a temperature-responsive reversible reaction due to phenol urethane bonds, so as to ensure the good mechanical properties at the service temperature and better processing performance via deblocking into smaller molecular weight at the processing temperature; in addition, negative induction effect of the halogen substituents endow BPA derivatives with deblocking reaction at lower temperature. The experimental results confirmed that the blocking reaction carried out completely at 70°C, and accompanying by the dramatical increase of molecular weight. The obvious deblocking reaction happened at 140°C, where the average molecular weight of TPUs decreased from 22,600 g/mol to 13,690 g/mol. Meanwhile, the melt flow index increased significantly with the extension of heating time, indicating that the PU has good processing properties. After the deblocking and re-blocking reactions were repeated alternatively, there is almost no change in its tensile properties, molecular weight and melt outflow index within two cycles under air atmosphere. This article proposes a strategy of congruent modification in both mechanical and processing performances of TPU.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51226
·
IF 3.125
Yifan Liu,Ruihan Pei,Yuancai Lv,Chunxiang Lin,Jianhui Huang,Minghua Liu
Due to the low concentration of silver in water, most of the cellulose adsorbents exhibited low removal efficiency, which greatly limited their practical applications. Herein, a cellulose aerogel modified by thiosemicarbamide (CAT) was fabricated for reducing and adsorbing silver ions from low concentration wastewater. The characterization results concluded that CAT owned a three-dimensional spongy structure with many circular microspheres and a better specific surface area (19.37 m 2 g −1 ), as well as the functional groups of ─C═N + ─H and ─(C═S)─N. The static batch adsorption experiments demonstrated that CAT could reached the maximum removal percentage of 94.94% and adsorption capacity of 42.12 mg g −1 under the initial concentration of Ag(I) was 15 mg L −1 and the pH value was 7. Meanwhile, the adsorption of Ag(I) on CAT was second-order reaction, and the Langmuir model could better fit the adsorption process. In addition, CAT exhibited wide pH values (1–9) adaptability and excellent adsorption performance for silver through electrostatic interaction, chelation, and reduction. This study probably provides a new method as well as important experimental data and theoretical reference for the removal of silver ions and other metals.
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高影响因子
危险品化学品经营许可证（带存储）