JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 8
·48405
·
IF 2.188
Qing Wen,Lijuan Xu,Xiansen Xiao,Zhenghui Wang
Cationic nanopolystyrenes (CNPSs) were prepared by the polymerization of styrene with a cationic polymerizable emulsifier, N-(2-(methacryloyloxy)ethyl)-N,N-dimethyltetradecane-1-ammonium bromide (MDTB), in the presence of 2,2′-azobis(2-methylpropionamidine) dihydrochloride (APPH). The polymerization kinetics was investigated through monomer conversion versus polymerization time. 1 H NMR spectra and FTIR spectra were used to confirm the structures of MDTB and nanopolymers. The particle size, ζ-potential, molecular weight, and thermal stability were also investigated by Zetasizer, gel permeation chromatography, and thermogravimetric analysis, respectively. The antibacterial activities of the obtained products were evaluated by minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against Staphylococcus aureus ATCC 29913 ( S. aureus , a Gram-positive bacterium) and Escherichia coli ATCC 25922 ( E. coli , a Gram-negative bacterium). The results indicated that the polymerization has the characteristics of microemulsion polymerization, all nanopolystyrenes are cationic and can be stored in the form of a microemulsion in aqueous phase, CNPSs present stable chemical structure at 190 °C, and their MIC and MBC reach 0.0625 and 0.125 mg mL −1 for E. coli , 0.0325 and 0.0625 mg mL −1 for S. aureus , respectively. Therefore, CNPSs are a promising new type of polymer antimicrobial agent, which can be used in the development of antimicrobial polymer materials and their products. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48405.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 5
·e56438
·
IF 2.7
Jiawei Hai,Chuang Zhan,Xunwei Chen,Biwei Qiu
This study explores how acid type (hydrochloric acid [HCl], p-toluenesulfonic acid [TSA], and formic acid [FA]) and concentration affect the structure of polyaniline (PANI) and the electrochemical properties of its composite with vertically aligned single-walled carbon nanotubes (SWCNTs). PANI doped with TSA (PANI-TSA) exhibited improved dispersion and conjugation attributed to the larger anion volume, which mitigates interchain spacing, in contrast to PANI doped with HCl (PANI-HCl) and FA (PANI-FA). Additionally, varying the organic acid concentration affected PANI's morphology and the concentration of quinone structure, with TSA leading to a fibrous structure and enhanced electrochemical characteristics. The study further investigated the SWCNTs/PANI composite, revealing that higher TSA concentrations enhance conductivity and specific capacitance of the composite membrane due to sulfonic acid group. Notably, HCl-based SWCNTs/PANI only at higher acid concentrations exhibits superior electrochemical characteristics than TSA-based SWCNTs/PANI, achieving charge transfer resistance down to 5.514 Ω cm 2 at 1.0 mol/L. Moreover, applying an electric field during membrane synthesis significantly increased the specific capacitance of composite prepared with PANI-TSA, highlighting the role of voltage in optimizing electron transport efficiency within the composite.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 11
·
IF 1.768
Caideng Yuan,Jingpeng Wang,Mingtong Cui,Yan Peng
Waterborne polyurethane/polyacrylate (PUA) emulsions were prepared by dispersing polyurethane (PU) prepolymer in polyacrylate (PA) emulsion; therefore, the PU particles formed in the presence of PA nanoparticles. The particle size and its distribution of the composite PUA emulsion were determined by dynamic light scattering. The result shows that the average particle size increases initially and then decreases with increasing PA content, which is confirmed by transmission electron microscope characterization. The surface properties of PUA films were analyzed by water contact angle and atomic force microscope topography. It indicates that the water contact angle and the average roughness of the composite PUA films are larger than those of the PU film. Meanwhile, mechanical properties test, scanning electron microscopy, and thermogravimetric analyses disclose that the PUA films are characterized by enhanced tensile strength, rough fractured surface, and good thermal stability. The preparation method proposed in this article is an effective and convenient way to manufacture composite PUA emulsion. The composite PUA emulsion can be potentially used in coatings. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43203.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 33
·e55841
·
IF 2.7
Yu Du,Hang Tao,Yang Yang,Changzhi Su,Junrong Wang,Yongnian Wang,Boping Liu,Yulong Jin
In this work, four kinds of silica with similar textural properties but different particle size (PS) from 6 to 60 μm were selected as support to prepare silyl-chromate/VO x /silica bimetallic catalysts for ethylene polymerization, thus making it possible to conduct convincing investigation on the effects of catalyst PS over catalytic behaviors and polymer properties. It is found, owing to mass- and heat-transfer limitations, the catalysts with smaller PS showed higher initial activity, while the deactivation in the later stage was more remarkable. Meanwhile, catalysts with smaller PS synthesized bimodal ultrahigh molecular weight polyethylene/high-density polyethylene in-reactor blends (UHMWPE/HDPE IRBs) with higher molecular weight ( MW ) and narrower molecular weight distribution (MWD). Four PE sample couples with MW increasing from 5 × 10 5 to 10 × 10 5 g mol −1 and PS from 40 to 460 μm were selected for tensile and rheological tests. For each couple with similar MW and MWD, the sample with smaller PS always had larger tensile strength and breaking elongation. The cryogenically fractured surface of the samples made by smaller PE particles showed fewer delamination defects and unfused small particles. The rheological results indicate that higher homogeneity was achieved for the sample with smaller PS, which was reflected by the unexpected higher viscosity and storage modulus.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 36
·49077
·
IF 2.52
Shengyu Hu,Jiahui Wu,Zhixiang Cui,Junhui Si,Qianting Wang,Xiangfang Peng
Electrospun nanofibers have attracted tremendous attention because of their similar structure with extracellular matrix. In this work, the polydopamine (PDA) coating layer was first applied to modify hydroxyapatite (HA) nanoparticles and obtain functional HA@PDA nanoparticles. Subsequently, the polylactic acid (PLA)/HA@PDA composite nanofibers were prepared via electrospinning. The hydrophilicity and water absorption of PLA/HA@PDA composite nanofibers were larger than those of PLA and PLA/HA composite nanofibers. The thermal stability, static and dynamic mechanical properties of PLA/HA@PDA composite nanofibers significantly increased because the PDA coating layer on the surface of the HA nanoparticles acted like a glue-like transition layer, which led to an increase in interfacial adhesion between HA@PDA nanoparticles and the PLA matrix. The attachment and viability of mouse embryonic osteoblast cells (MC3T3-E1) cultured on the PLA/HA@PDA composite nanofibers were significantly increased compared with those cultured on the PLA and PLA/HA composite nanofibers. These results suggested that the PLA/HA@PDA composite nanofibers have superior mechanical and biological properties, which makes it potentially useful for tissue engineering scaffolds.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52346
·
IF 3.057
Yuhan Xu,Chenyu Zhao,Zhiyuan Guo,Wenjie Dong,Xiucai Liu,Weihong Guo
Polyamide is an engineering plastic, which has been widely used in industry and life. Polyamide 56, as a green and environmentally friendly bio-based product, is gradually replacing traditional petroleum-based products. However, in terms of auto parts, communication equipment, and mechanical products, a single polyamide monomer is difficult to meet the end-use standard. EPDM-g-MAH (ethylene propylene diene monomer grafted with maleic anhydride) is melt blended with bio-based polyamide 56 (PA56) in a twin-screw extruder to obtain polyamide elastomers with different formulations. Subsequently, its morphology and structure, thermodynamic properties, crystallinity, and mechanical properties were analyzed. The test results show that the composites containing 10% EPDM-g-MAH have better impact resistance and thermal properties in the range of adding 0‑20 wt% EPDM-g-MAH. In the fracture morphology analysis, it is found that the interface between the rubber phase and the polyamide phase fused well, and the elastomer showed the ductile fracture.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 26
·
IF 1.768
Xiang Gao,Wei Sheng,Yongchang Wang,Yegang Lin,Yingwu Luo,Bo-Geng Li
To assure the safety of the lithium-ion battery, the separator is required to have good thermal stability. Because the single-layer polyethylene (PE) separator can only tolerate a temperature of 130°C, it is seldom employed currently by lithium-ion battery manufacturers although its cost is low. In this article, we modified PE separator chain structure through solid-state ultraviolet (UV) irradiation method to achieve a separator with composite structure of ∼40% crystallized PE and ∼70% gel content. Approximately 40% crystallized PE chains fulfill the task of auto-shutdown at 130°C through melting and filling the pores. At the same time, the PE separator can maintain integrity till 220°C because of its highly cross-linked chain structure. Besides, the modified PE separator is hydrophilic with a water contact angle of 33° after UV treatment and is able to absorb more electrolyte. However, the tensile strength and elongation at the break decreased because the cross-linking network increased the rigidity. Nevertheless, these values still meet the requirements as the separator for lithium-ion battery. Considering the low cost and easy preparation, current cross-linked PE separator has potential to be used in lithium-ion batteries for various applications, including electric vehicles and energy storage purpose. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42169.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 18
·52059
·
IF 3.125
Xi Hou,Liwen Sun,Wei Wei,Darlene K. Taylor,Shengpei Su,Haibin Yu
Thermoplastic polyurethane (TPU) has become the focus of attention in the green and sustainable materials field because of its superior processability and recyclability. In this paper, a series of polylactic acid (PLA) and polycaprolactone (PCL)-based TPUs were successfully prepared by selecting PLA glycol, PCL glycol, isophorone diisocyanate (IPDI) and 1,4-butanediol (BDO) through a one-step polymerization method. The properties of the PLA and PCL-based TPUs are comprehensively characterized by Fourier transform infrared spectroscopy, 1 H NMR spectra, gel permeation chromatography, differential scanning calorimetry, thermalgravimetric analyzer, tensile test, dynamic mechanical analysis, scanning electron microscope, and so forth. The effect of hard segments content and PLA glycol molecular weight on the properties of PLA and PCL-based TPUs was systematically studied. Notably, their performance shows a certain degree of regularity and can be controlled by adjusting the hard segments content or the molecular weight of the PLA glycol. The prepared PLA and PCL-based TPUs have a tensile strength of 24.71 MPa, excellent thermal stability and out-standing damping performance. Its tan δ max of 1.40 and an effective damping temperature range of 50°C also make it a green damping material with great potential.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 27
·e55602
·
IF 2.7
Zhenjie Gan,Shuxiu Ma,Yinlong Zhang,Yuzhou Wang,Wenbo Liu,Jiliang Cao,Na Li
Both hydrophobic and hydrophilic pollutions have damage on our environment, and it is necessary to remove them. However, the treatments for different water pollutions can be specific due to the hydrophobicity of various molecules. Therefore, it is important to separate pollutants with different hydrophobicity. In this work, we developed a diffusion separation method based on hydrophobicity selectivity polymer membranes, whose selectivity between hydrophilic and hydrophobic pollutants can be up to more than 100. By doping pH-responsive monomer into hydrophobic polymer membrane, the permeability of membrane can be tuned by surrounding pH, and the selectivity is not decreasing. With the results of characteristics on contact angle, scanning electron microscope, and mechanical properties, we prove the stimuli-responsive polymer membrane at different states have similar properties with the nonresponsive amorphous polymer membranes with high separation selectivity.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 29
·e52647
·
IF 3.057
Jinrong Yin,Yunlei Gong,Huaan Zheng,Hui Yuan,Zhen Zeng,Wei Qin,Chenghao Li,Yang Zhou,Xianyan Ren
Ultra-low-density proppants are of great significant in slick water fracturing system, but the polymer composite microspheres can hardly promise the quality of oil and gas due to their poor hydrophobicity. To address the issue, we prepared several types of modified styrene-divinyl benzene copolymer microspheres (MSDBs) with long-term durable hydrophobicity and high strength, including O-MSDBs (hydrophobic MSDBs), LO-MSDBs (long-time hydrophobic MSDBs), and CO-MSDBs (coated O-MSDBs) on the basis of a molecular structure of “KH570-styrene (St)-divinyl benzene (DVB)” copolymer. In this article, the design concept and the structure of MSDBs was clarified, and performances of MSDBs are systematically discussed and compared with commercially available hydrophobic microspheres. The O-MSDBs, a kind of nanoparticle patterned St-DVB copolymer microspheres, were prepared by a one-step suspension polymerization undergoing a sol–gel process, showing strong hydrophobicity with a water contact angle up to 140.7°, but short durability in strong hydrochloric acid or hydrofluoric acid; On the contrary, LO-MSDBs perform better in the stability and durability of hydrophobicity with a slightly lower water contact angle about 135.9°. The LO-MSDBs were designed by coating functionalized St-DVB copolymer microspheres with fluororesin. Similarly, CO-MSDBs from fluororesin-coated O-MSDBs were designed. As expected, CO-MSDBs have a stronger hydrophobicity (139.0°) than LO-MSDBs and longer durability than O-MSDBs. Moreover, the MSDBs exhibit better properties than the commercially available hydrophobic polymer and ceramic microspheres.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 22
·50525
·
IF 3.125
Songyi Li,Yihua Cui,Jingjing Li
In order to lower the volume shrinkage of the DLP 3D printing photosensitive resins during printing, a thiol-terminated hyperbranched polymer (T-HBP) was synthesized and introduced into the bisphenol A epoxy acrylate (EA) based photosensitive resin system. The obtained T-HBP was characterized by FTIR and 1 H NMR spectra, and the grafting rate of sulfhydryl was determined. The mechanical properties of the photosensitive resins were measured by tensile and impact strength measurement. The glass transition temperature of the photosensitive resins was analyzed by DSC and the impact fracture surface was observed by SEM. T-HBP exhibited a much lower viscosity than its linear counterparts, and the addition of thiol improved the curing speed of the photosensitive resins. When the amount of T-HBP added was 20 wt%, the shrinkage of the photosensitive resins was reduced by about 45.5% and the impact strength increased by 33.9% compared with the control. The macromolecular spherical structure of T-HBP effectively reduced the functional group density of the photosensitive resins. In addition, the thiol-acrylate photopolymerization introduced by T-HBP further reduced the volume shrinkage of the photosensitive resins.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Man Liu,Chuandong Shi,Hongmei Qin,Chuanxi Xiong,Quanling Yang
The demand for dielectric capacitor materials has significantly increased, owing to the need for highly efficient operation at elevated temperatures amidst the rapid advancements in modern electronics. In this contest, fluorinated polyimide (FPI)/CaCu 3 Ti 4 O 12 (CCTO) composite films have been successfully fabricated through a straightforward blending approach. The modified CCTO (mCCTO) is prepared by first hydroxylation CCTO and subsequently by grafting KH550 onto its surface, a strategy aimed at enhancing the interfacial compatibility with FPI. The synergistic effect of the high dielectric constant and good dispersibility of CCTO inorganic fillers underscores the significant role of filler dispersibility in enhancing the high-temperature capacitive performance of polymer composite materials. The dielectric constant of FPI-mCCTO composite films containing 9 wt.% mCCTO reached 8.5 at 150°C, more than double that of pure FPI (3.0). Furthermore, the FPI-0.09-mCCTO composite films exhibited the highest discharge energy density of 4.92 J·cm −3 at 355 MV·m −1 . This facile approach provided a viable strategy for fabricating high-temperature dielectric materials for electrical energy storage.
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高影响因子
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