JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 8
·e53513
·
IF 3.057
Jingru Sun,Huan Liu,Sheng Xu,Ying Zhu,Chunmiao Xia,Lei Gan,Rongli Zhang,Cuige Zhang,Zongcheng Miao
A new strategy was developed to prepare nanoscale porous carbon spheres (PCSs) using cross-linked chitosan/poly(γ-glutamic acid) colloidal particles as precursor. The fabricated cross-linked chitosan/poly(γ-glutamic acid) colloidal particles (Ca 2+ /CS/γ-PGA CPs) were prepared from the self-assembly of negatively charged poly(γ-glutamic acid) and positively charged chitosan, and the cross-linking of Ca 2+ in aqueous solution, via the electrostatic interaction. After lyophilization, the Ca 2+ /CS/γ-PGA CPs power was obtained, followed by carbonization in a tube furnace under N 2 atmosphere. Finally, the products were washed by hydrochloric acid, obtaining PCSs with hierarchical pore structure and super-hydrophobicity. The prepared PCSs exhibited excellent separation performance for oil-in-water emulsions.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 6
·e53427
·
IF 3.057
Bing Yin,Xujiang Hua,Fangyu Fan,Dongmei Qi,Kailu Han,Youqing Hou,Dongshuai Hou
Improving the permeability of concrete is one of the important measures to extend the service life of concrete. In addition, for marine engineering, sewerage projects, and so on, mechanical stability and microbial induced corrosion of concrete structures cannot be ignored. We demonstrated a method to prepare high-performance super-hydrophobic (SHP) coating using functional zirconium phosphate (ZrP) and polydopamine (PDA) as the primary materials. The micro-nano rough structures were constructed on the concrete surface by alternating organic–inorganic assembly guided by each other. The coatings' apparent morphology, composition, and structure were analyzed using various surface analysis techniques. Based on the construction of micro-nano rough structures by the induced assembly of functional ZrP, the silane treatment significantly improved the water contact angle of the coating (WCA = 154° ± 3°), and the coating exhibited relatively high wear resistance, reaching 135° WCA even after 30 friction cycles. The water absorption of the specimens treated with the SHP composite coating was reduced by 79% to treated with silane. Meanwhile, the SHP composite coating showed excellent antimicrobial and anti-ice properties, due to the role of the functional ZrP and alternating organic–inorganic assembly. It was expected that the composite coating might potentially promote and accelerate applied superhydrophobic anticorrosive coating development for marine concrete durability.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 6
·e53457
·
IF 3.057
Bowen Li,Guojun Song,Zhi Peng,Wenjian Zhang,Hao Zheng,Junjie Zhu,Chaohang Wang,Jianfa Wang,Ruiyue Ma,Shaoqian Zhu,Xiaoping Yang,Yudong Huang,Lichun Ma
Carbon fiber (CF) reinforced matrix composites have been applied widely, however, the interfacial adhesion of composites is weak due to smooth and chemically inert of CF surface. To solve this problem, A polydopamine/nano-silica (PDA-SiO 2 ) interfacial layer on carbon fiber surface was constructed via polydopamine and nano- SiO 2 (CF-PDA-SiO 2 ) by a facile and effective method to reinforce polyamide 6 composites (CFs/PA6). The effects of PDA-SiO 2 interfacial layer on crystallization structure and behavior, thermal properties, and mechanical properties of CFs/PA6 composites were investigated. Furthermore, interfacial reinforcement mechanism of composites has been discussed. This interfacial layer greatly increased the number of active groups of CF surface and its wettability obviously. The tensile strength of CF-PDA-SiO 2 /PA6 composites increased by 28.09%, 19.37%, and 26.22% compared to untreated-CF/PA6, CF-PDA/PA6, and CF-SiO 2 /PA6 composites, respectively, which might be caused by the increased interfacial adhesion between CF and PA6 matrix. The thermal stability, crystallization temperature, crystallinity, and glass transition temperature (T g ) of CF-PDA-SiO 2 /PA6 composites improved correspondingly, attributing to the heterogeneous nucleation of nano-SiO 2 in the crystalline area and hydrogen bonds with molecular chains of PA6 in the amorphous area. This work provides a novel strategy for the construction of interfaces suitable for advanced CF composites with different structures.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53340
·
IF 3.057
Bozhen Wu,Renrong Liu,Yuhao Yang,Honghao Zhu,Yujing Yu,Jiang Huang,Yulin Li
In the face of electromagnetic pollution issues caused by the advancement of communication technology, it is of great significance to develop materials with high electromagnetic interference (EMI) shielding capability as well as high absorption efficiency. The nickel-coated silicon carbide whiskers (Ni@SiCw)/graphene nanosheets (GNP)/polyvinylidene fluoride (PVDF) EMI shielding composites with the asymmetric structure are constructed by simple solution mixing and multiple hot pressing. Specifically, the Ni@SiCw in the top layer is prepared by simple electroless plating, and the saturation magnetization intensity reaches 12.50 emu/g. The combination of dielectric and magnetic losses provides reliable electromagnetic wave absorption performance with a reflection coefficient less than 0.35. GNP is selectively enriched in the bottom layer with a maximum conductivity of 85.43 S/m. The composite shows an EMI shielding performance of 36.83 dB when the GNP content is just 4 wt%, which means 99.98% of microwaves can be shielded. Furthermore, due to the distinct structure, the composites display various shielding mechanisms when electromagnetic waves are incident from different faces. Without a doubt, this asymmetric structure offers a novel approach to the preparation of directional EMI shielding materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53397
·
IF 3.057
Chen Zhang,Ruiyun Cai,Chuanbang Xu,Hongwei Xia,Yun Zhu,Shengmiao Zhang
Effective flame retardant strategy for open-cell foam (e.g., polyHIPE) remains of a great challenge. Herein, a void surface flame retardant strategy for polyHIPE was presented. An open-cell polystyrene (PS) polyHIPE was fabricated through an emulsion-templating technique. Polyphosphazene (PSZ), a highly efficient flame retardant polymer, was then in situ fabricated and covalently attached to the void surface of the foam to be a uniform flame retardant protective layer, while the open-cell structure of the foam was perfectly preserved. Compared with the pristine PS polyHIPE, the PSZ modified one had significantly improved thermal stability (char residues yield at 800°C increased from 3.36 to 16.53 wt%) and mechanical properties (Young's modulus increased by 2.6 times); the values of average heat release rate and total heat release of combustion were reduced by 62.36% and 41.57%, respectively. While, the value of limiting oxygen index was increased from 17.39% to 19.75%, owing to the combined action of condensed phase flame retardant and gas phase flame retardant. These results indicate that the in situ surface modification strategy is effective for improving the flame retardancy of highly interconnected polymer foams.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53418
·
IF 3.057
Mengdi Chen,Mingfu Zheng,Lu Zhang,Yunsheng Xu,Xianming Zhang,Wenxing Chen
In this work, multiple rheological and molecular structure characterization methods are utilized to investigate the melt post-polycondensation (MPP) process of polycarbonate (PC) at high temperatures (260–300°C) under a nitrogen atmosphere. We find some unexpected phenomena that the complex viscosity of PC melt rise rapidly and it reaches an extraordinarily high value of about 10 6 Pa·s during the MPP process of 10 h at 300°C. Dissoluble PC and insoluble gel residue are separated and both fractions are analyzed by gel permeation chromatography, 1 H-NMR, and pyrolysis-gas chromatography mass spectrometry. Results show that the molecular weight of dissoluble PC significantly increases at the early stage of the reaction (less than 1 h). After that, it continues to reduce due to the occurrence of branching reactions and degradation reactions caused by high temperature reactions for a long time. Chemical structure analysis indicates that the same two branched structures are discovered in both dissoluble PC and insoluble gel residue, the changes in structures indicate that no new structures are formed during the crosslinking reaction. According to this study's results, we clearly understand the correlation between the rheological properties and structural changes for PC in the MPP progress.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53412
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IF 3.057
Xin Yang,Xiao Ma,Jingjing Yuan,Xia Feng,Yiping Zhao,Li Chen
Inorganic nanoparticles (NPs) have been employed in modification for polyvinyl chloride (PVC) membrane intrinsic hydrophobicity. Carboxymethyl chitosan (CMC), a natural organic matter, was used to relieve the agglomeration of zinc oxide (ZnO) NPs in the membrane matrix. In this paper, ZnO-CMC NPs were successfully prepared via co-precipitation approach, blended with PVC membranes, and the effect of ZnO-CMC NPs for the membrane properties was studied. The SEM and EDX confirmed excellent dispersion of ZnO-CMC NPs on the membrane surface. The enhanced hydrophilicity, porosity and inter-connected finger-like strcture of modified membranes confirmed by water contact angle and SEM. In addition, pure water flux of PVC/ZnO-CMC composite membrane was 107.36 L m −2 h −1 (PVC/ZnO-CMC (0.25 wt%)), which was higher than that of neat PVC membrane (83.11 L m −2 h −1 ). Importantly, the modified membranes exhibits lower static BSA adsorbtion because of the improved hydrophilicity, and a higher flux recovery rate (>90%) after three sequential filtration cycles. The antibacterial behavior of PVC/ZnO-CMC membrane was tested simply using Escherichia coli , and the results indicated that all composite membranes possess excellent antibacterial properties. Our work presents PVC/ZnO-CMC NPs composite membrane a promising future in wastewater treatment and antibacterial application.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 4
·e53352
·
IF 3.057
Heng Li,Yu Guo,Buyun Ma,Yunzhu Qian,Wentao Sun,Xuefeng Zhou
Surface heparinization is an effective solution to resolve low endothelialization, poor anticoagulation, and hemocompatibility of polyurethane (PU) used as materials of small-diameter vascular grafts. Here, the effects of polydopamine (PDA) and poly (acrylic acid) (PAA) as crosslinking agents on the surface heparinization were explored. The PU membranes grafted with heparin (Hep) via dopamine (PU/PDA-Hep) showed better hydrophilicity and stability, compared to heparinized PU membranes via acrylic acid (PU/PAA-Hep). The results of X-ray photoelectron spectroscopy demonstrated that heparin was successfully grafted onto the PU surface and the grafting efficiency was high when PDA as a cross-linking agent. The grafted heparin aggregated and formed nanoparticles, and increased the surface roughness of PU membranes. The heparinized membranes demonstrated good anti-adhesion of bovine serum albumin and fibrin protein. In addition, no activated platelets or educts on heparinized PU were found by platelet adhesion tests, implying that heparin-immobilized surfaces had good hemocompatibility. Moreover, the in vitro cytocompatibility assessment showed that the PU/PDA-Hep significantly improved the proliferation of L929 cells and was superior to PU/AA-Hep. These results demonstrated that PDA-assisted surface heparinization was an effective method to improve the anticoagulant and biocompatibility of PU small-diameter vascular materials and could be extended to other implantable materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 1
·e53252
·
IF 3.057
Chenglin Li,Qingyuan Du,Changhao Liu,Yi An,Ying Liu,Xiuting Zheng,Yue Ru,Dali Gao,Daming Wu,Jingyao Sun
Due to the rapid development of multifunctional and miniaturized electronic devices, the demand for polymer composites with mechanical properties, high-thermal conductivity, and dielectric properties is increasing. Therefore, the heat dissipation capacity of the composite must be improved. To solve this problem, we report a glass fabric (GF)/boron nitride (BN) network with a highly thermally conductive hetero-structured formed using polyvinyl alcohol (PVA) as an adhesive. The GF and BN are furtherly modified by (3-aminopropyl)triethoxysilane (APTES) for better thermal conductivity enhancement. When the BN content is 30%, the thermal diffusion coefficient and thermal conductivity of obtained PVA-mBN@mGF (PBG) are 2.843 mm 2 /s and 1.394 W/(m K), respectively. Epoxy (EP) resin is then introduced to prepare PBG/mBN/EP laminated composites via the hot pressing method as applied as thermal conductive composites. A highest thermal conductivity of 0.67 W/(m K) of PBG/mBN/EP laminated composites is obtained, three times higher than that of pure EP. In addition, the PBG/mBN/EP laminated composites also present favorable mechanical, electrically insulating, and dielectric properties.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 1
·e53261
·
IF 3.057
Shangru Cheng,Yaokai Tang,Qiangmin Gao,Xincheng Wang,Anqi Li,Yingxin Yuan,Shanshan Guan
A longstanding challenge in fabricating high-dielectric polymer composite is how to rationalize structure design to improve dielectric constant while minimizing dielectric loss. In this work, we provide a critical material design concept for high-performance flexible dielectric nanocomposite (PCGA) based on backfilling polydimethylsiloxane (PDMS) matrix into the pre-constructed chitosan-reduced graphene oxide (rGO) aerogel with 3D conductive network. Herein, the 3D conductive network enables PCGA to achieve the percolation threshold with a small amount of rGO, which improving the dielectric constant. Simultaneously, the chitosan insulating barrier layer prevents the generation of leakage current between conductive fillers interfaces, which suppressing the losses of the PCGA, thus ensuring the balance between dielectric constant and loss. The results demonstrated that the PCGA (0.06 g rGO) exhibited a dielectric constant as high as 297.3 and a loss tangent as low as 1.91. Subsequently, the as-obtained PCGA composites as a dielectric interlayer was employed for preparing capacitive sensor. The results demonstrated that the sensor possesses a desirable integration of high sensitivity (5.8% kPa −1 in the pressure range 0–7 kPa) and wide work range (0–140 kPa) due to the synergistic effect of the excellent mechanical performance along with high-dielectric constant and suppressed loss.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 8
·e53520
·
IF 3.057
Yimei Chen,Wei Yang,Juan Liu,Yuanliang Wang,Yanfeng Luo
2-Ureido-4[1 H ]-pyrimidone (UPy) can form strong quadruple hydrogen bonding (H-bonding) and is widely used to construct supramolecules. Though the H-bonding assembly of UPy-containing polymers has been widely reported, little attention is paid to the H-bonding characteristics and mechanism of UPy-containing polyurethanes. Here, by using UPy- p -PDLLA-SMPU, a linear polyurethane with multiple pendant UPy units as the model polymer, the H-bonding assembly characteristics in solution, solid film and melt are systematically investigated. It is found that the UPy units mainly exist as free monomers in DMSO, UPy dimers in CHCl 3 , and both free monomers and dimers in DMF. The dimerization of UPy can promote the H-bonding of urea and urethane groups and thus the formation of hard segment aggregates. Thereby, the thermal resistance and reversibility of the H-bonds are significantly enhanced in both UPy- p -PDLLA-SMPU film and melt. UPy- p -PDLLA-SMPU can transition from a rubber state (70°C–85°C) to a viscous flow state (≥120°C), presenting the characteristics of both chemically crosslinked and linear polyurethanes. This work provides a clear picture on the H-bonding assembly of UPy units together with urea and urethane groups in UPy- p -PDLLA-SMPU. The obtained assembly characteristics and mechanism are beneficial for the design and processing of UPy-based physically crosslinked polyurethanes.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 6
·e53429
·
IF 3.057
Qingzhong Liu,Mingquan Ye,Gaoqiang Yu,Aijun Han
In this work, a hybrid nanocomposite of poly(styrene-co-butyl acrylate-co-dodecyl acrylate) and octavinyl polyhedral oligomeric silsesquioxane (ovi-POSS) was synthesized by suspension polymerization and the composite resin was characterized by Fourier transform infrared, scanning electron microscopy energy-dispersive spectrometer and thermal gravimetric analysis. The effects of ovi-POSS content on the oil absorbency of hybrid composite resin were investigated. The results indicated that the maximum saturated oil absorption rate of sample PSBLA/ovi-POSS-1 with 1 wt% ovi-POSS content toward four oils and organic solvents (toluene, xylene, gasoline, and diesel) are, respectively, 20.51, 18.56, 12.48, and 7.03 g g −1 , and the process taken just about 5 min. The absorption kinetic model fitting proved that the adsorption behavior of the four oils on PSBLA/ovi-POSS-1 resin microspheres was dominated by the physical adsorption. Besides, PSBLA/ovi-POSS-1 has good oil retention rate (stay over 95% after centrifuging at 3000 rpm for 5 min) and reusability (for 12 times). These excellent oil absorption performances are attributed to the loose network structure of the composite resin. The rapid and efficient oils absorption properties give the composite resin potential practical applications in many areas.
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高影响因子
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