JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 46
·51382
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IF 3.125
Longfang Ren,Congcong Lin,Pingchuan Lei
A series of waterborne polyurethane (PDMAPU) containing catechol group were prepared by double-bond random copolymerization of terminated double bond polyurethane prepolymer with modified acrylamido dopamine under thermal initiation. This kind of mussel-like waterborne polyurethane adhesive is inspired by marine mussel, as well as it is environment-friendly and used in bonding of leather. FTIR and 1 H NMR proved the successful introduction of catechol group into polyurethane matrix. Oxidative cross-linking between catechol unit and molecular chain in PDMAPU structure, the thermal stability and crystallization ability of PDMAPU was significantly improved. The increase of the particle size of PDMAPU emulsion showed that the introduction of catechol group changed the microstructure of polyurethane and enhanced the cross-linking degree. The water resistance of polyurethane emulsion was further improved. Compared with PU without catechol group, the peel strength of leather substrate adhered by PDMAPU emulsion increased from 0.42 to 1.93 MPa, which indicated that PDMAPU has better bonding properties with leather. The bidentate hydrogen bond formed with catechol group as the reaction sites is considered to be the key reason for the adhesion of mussel-like polyurethane adhesive to hydrophilic substrates. This work provides an alternative to prepare environment-friendly high performance adhesive for hydrophilic substrates.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 2
·51482
·
IF 3.125
Jixiang Yang,Haoyu Fan,Yuqian Zhou,Huiyun Liang,Liheng Zeng,Dong Xie,Tianying Guo
A novel strategy for fabricating waterborne superhydrophobic coatings with controllable adhesive force to water-droplet has been developed by blending the amphiphilic silica nanoparticles modified using thermally sensitive amphiphilic polymers with polymer latex, which could be applied for self-cleaning or no loss transfer of microdroplets. And a theoretical analysis of the relationship between the surface chemical composition and the water-droplet adhesion of the superhydrophobic nanocomposite coating is proposed.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 3
·51493
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IF 3.125
Haibo Ouyang,Man Zhou,Jie Fei,Xiao Duan,Tian Liu,Bei Zhao,Jian Feng Huang
The metal organic frameworks (MOF-5) with nanoscale porosity and organic–inorganic heterocyclic structure were chemically grafted onto carbon fibers by solvothermal for forming high mechanical interlocking composite architectures and releasing the interfacial forces, so as to obtain carbon fiber reinforced composite with excellent mechanical and tribological properties. With the multi-scale enhancement of MOF-5, the optimized tensile and bending strength of the composite increased by about 177.9% and 81.3%, respectively. Moreover, the friction coefficient was higher and relatively stable under the continuous wet friction condition, as well as the wear rate was reduced by 44.4%. The work suggests that the application of MOFs can be extended to the field of structural composites.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 3
·51496
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IF 3.125
Weining Du,Xinguo Ge,Hao Huang,Tianhao Zhang,Zejiang Zhang,Xiang Shang
To manufacture transparent waterborne polyurethane composite coatings that possess desirable mechanical and flame retardancy properties is still a challenge. Herein, we first synthesized phosphorus-silicon functionalized cellulose nanocrystals (FCNC) filler, and further introduced it into waterborne polyurethane (WPU) matrix to prepare composite. The phosphorus-silicon-containing components were grafted covalently on the surface of FCNC, and the FCNC showed good dispersion level in water and WPU matrix. Moreover, the inserted FCNC could not only maintain the high transparency of WPU-FCNCs composites, but also remarkably enhancing the mechanical and flame retardancy performances. Noticeably, the WPU-FCNC3 composite containing 3 wt% of FCNC showed balanced mechanical ( σ b = 16.7 MPa, ε b = 557.5%), limiting oxygen index (22.9%), and a UL-94 rating of V-2 among prepared films. Additionally, WPU-FCNC3 composite exhibited significantly reductions in heat release during combustion, and also showed a high transmittance of 92.2%. The present research supplies promising way for developing transparent, toughness, and flame retardant composite coatings.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51395
·
IF 3.125
Jinsheng Zhou,Yugui Sun,Zixiang Huang,Zhongkuan Luo,Huiyuan Hu
Polyvinyl alcohol (PVA) hydrogel was modified with NIPAAm via a green, efficient, and industrially applicable photo induced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization catalyzed by organic dye. The hydrophilicity of PVA-g-pNIPAAm became temperature sensitive due to the introduction of pNIPAAm polymer brushes. It was surprising that PVA-g-pNIPAAm became superhydrophilic (WCA = 4.3°) at 25°C while the grafting yield was 39.3%. In addition, no cytotoxic for primary human eyelid fibroblast cells was observed according to ISO 10993.5:2009. Antifouling properties of PVA-g-pNIPAAm were significantly improved due to the increase of surface steric repulsion effect. Drug release property of PVA-g-pNIPAAm was more controllable than PVA hydrogel. Thus, organic dye catalyzed PET-RAFT polymerization could be applied to construct functional surface on biomaterials, and PVA-g-pNIPAAm hydrogel with lower cytotoxic, higher antifouling, and drug release properties had great potential in drug delivery.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 40
·51169
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IF 3.125
Xianglong Li,Jing Liu,Yishen Lu,Teng Hou,Jing Zhou,Antuo Wang,Xianggui Zhang,Bin Yang
We developed a new environmentally-friendly disposable nonwoven based on centrifugally spun ST/PVA ultrafine fibrous membrane in this research. The effects of ST/PVA ratio as well as formic acid post-treatment on thermal properties, tensile strength, and disposability of fibrous membranes were studied. To observe the morphology and chemical structures changing of fibers during fabrication and post-treatment, the obtained fibers were characterized by scanning electron microscopy, x-ray diffraction, and Fourier transform infrared spectroscopy. The fibrous membranes with uniform fiber diameters and excellent disposability properties were formed. The ST/PVA ratio of fibers was optimized according to the disposability and tensile strength of the fibrous membranes. Disintegration of untreated and post-treatment fibrous membrane with ST/PVA ratio of 3/1 was over 80% and 40%, respectively, and the tensile strength was improved over two times comparing with pure starch fibrous membrane.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 39
·51017
·
IF 3.125
Haijie Li,Yuting Shang,Wenrui Huang,Bingfeng Xue,Xiaomeng Zhang,Zhe Cui,Peng Fu,Xinchang Pang,Qingxiang Zhao,Minying Liu
Succinic acid is an important synthetic monomer but it is difficult to use it as a precursor for synthesizing high molecular weight polyamide, due to its tendency to perform intra-cyclization reaction at high temperature. In order to solve this problem, in this paper, the direct solid-state polymerization (DSSP) method with the initial reactant, nylon salt which was composed of 1, 5-diaminopentane, succinic acid, and terephthalic acid, was applied to synthesize the bio-based copolyamide PA 5T/54. In comparison with the conventional melting polymerization method, the DSSP method can prevent the cyclization reaction of succinic acid effectively due to the lower reacting temperature as well as the restriction effect of the nylon salt. As a result, the product fabricated by DSSP method has higher molecular weight and much lighter color from red to white. Therefore, the DSSP method is advantageous for the synthesis of the polymers or copolymers composed of the succinic acid as the monomer. Furthermore, the polymerization mechanism proposed in this work can serve as a guidance for the design of the molecular structure and control of the polymerization process.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 38
·50979
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IF 3.125
Xinxin Sun,Yufei Zhao,Hui Li,Chunhui Luo,Faliang Luo
A polyvinyl alcohol (PVA)-agarose (agar) composite hydrogel (M-PVA-agar-60) was developed by simple three cycles of freeze-thawing, followed by successively soaking in ammonium sulfate aqueous solution to induce phase separation and dialyzing against deionized water to remove residual sulfate salts. Due to the synergy of crystalline regions, hydrogen bonding and phase separation domains, the obtained M-PVA-agar-60 hydrogel exhibits excellent mechanical properties (tensile strength = 1.1 MPa, tensile strain = 324% and compressive stress = 12.5 MPa), combined with a high water content of 87.0%. Moreover, the hydrogel hardly expands after immersing in the phosphate-buffered saline aqueous solution at 37°C for a week, and the tensile stress and toughness remain almost the same as their initial values, superior to most reported non-swellable hydrogels. Because of the biocompatible starting materials, absence of toxic chemicals, and dialysis in advance to remove ammonium sulfate, the hydrogel also shows excellent cell compatibility, making it an ideal candidate for tissue engineering materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 37
·50943
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IF 3.125
Rui Wang,Congzhen Xie,Bin Gou,Huasong Xu,Shoukang Luo,Yan Du,Jiangang Zhou,Hao Yang
Flexible nanocomposite dielectrics with high dielectric constant and discharge energy density have broad application prospects in the field of energy storage. However, dielectrics with high dielectric constant tend to have a high dielectric loss. Herein, we prepared a dielectric composite material with ultra-high discharge energy density by modifying the interface between nanoparticles and poly(vinylidene fluoride-co-hexafluoropropylene) (P[VDF-HFP]). After coating a shell of insulating amorphous SiO 2 (~7 nm) outside the barium titanate (BT), the electric field concentration and current density inside BT particles can be significantly reduced. In addition, coating the SiO 2 shell with a polydopamine (PDA) shell (~7 nm) not only enhances the interface interaction between the nanoparticles and the polymer matrix, but also can form lots of microcapacitors in the composite. As a result, an ultra-high discharge energy density of 13.78 J/cm 3 at the expense of relatively inconspicuous efficiency (~59.8%) in the BT@SiO 2 @PDA/P (VDF-HFP) with 2.5 wt% loading has been achieved under 460 kV/mm. This is mainly attributed to the increases of dielectric constant from 12.1 to 14.2 and the relatively low dielectric loss (0.086) at 100 Hz. Moreover, compared with the pure P (VDF-HFP) (400 kV/mm), the breakdown voltage of the composite with 2.5 wt% loading is surged to 460 kV/mm, which benefited from the hindrance of nanoparticles on carrier migration at low content. This work has realized a thin-film dielectric with ultra-high discharge energy density through a novel design of the nanoparticle structure, providing a theoretical direction for the development of polymer dielectric capacitors.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51226
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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
JOURNAL OF APPLIED POLYMER SCIENCE
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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
·
2021
·Vol. 138
·期 38
·50989
·
IF 3.125
Zuozhu Yin,Feng Yuan,Dongpeng Zhou,Min Li,Xiaoxiang Chen,Yan Liu,Mingshan Xue,Yidan Luo,Zhen Hong,Chan Xie
In this paper, the effect of ZnO nanoparticle on thermal, microstructure, mechanical behavior, superhydrophobicity of thermoplastic polyurethane (TPU), ZnO/TPU composite materials with doped-ZnO nanoparticles were obtained via a solution blending method. The results show that the melting temperature region in soft segments of ZnO/TPU composite materials was the transition temperature region. The added ZnO slightly enhances the crystalline slipped of ZnO/TPU composite materials, and effectively hinder the transfer of high temperature small gas molecules. Due to the added ZnO nanoparticles, the microphase separation and ordered structures in TPU are reduced. In TPU, and between TPU and ZnO nanoparticles, there are variations in electron density at hard phase and soft phase interfaces. The good ZnO/TPU composites exhibit high water repellence with water contact angle of ~157°. The prepared ZnO/TPU nanocomposites show mechanical properties that are superior to those of pristine TPU. Tensile strength and storage modulus increase by 47.1% and 39.8% at ZnO loading values of 10 wt%. The results indicate that thermal behavior, microstructure, superhydrophobicity and the mechanical behavior of TPU composite materials can be enhanced by the doped ZnO.
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高影响因子
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