JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xun Zhan,Jian Chen,Yanhua Kang,Zhaozhe Yang,Guomin Wu,Zhenwu Kong
In the application of waterborne coatings, enhancing the water resistance and mechanical properties of coating films derived from waterborne coatings has been a critical challenge in need of urgent resolution. To tackle this issue, we propose an innovative strategy that involves surface modification of cellulose nanocrystals (CNC) using long-chain alkyl alcohols and the preparation of polyurethane composite films with excellent hydrophobicity by compounding the modified CNC (C-CNC) with waterborne polyurethane (WPU). Using a custom mold, we achieved surface hydrophobic functionalization. This study delves into the impact of CNC on the hydrophobic composite film, particularly focusing on its contribution to film morphology, thermal properties, and mechanical properties, significantly enhancing its hydrophobicity. Experimental results demonstrate that the mold with a rough surface constructs numerous rough and porous structures on the coating film surface, significantly enhancing its hydrophobicity. Notably, the C 28 –CNC/WPU composite film prepared using octacosanol-modified CNC exhibits the best hydrophobicity, with a water contact angle reaching 122.80°. This strategy of preparing hydrophobic coating films through a simple and effective method not only overcomes limitations of waterborne coatings in terms of water resistance and mechanical properties but also holds significant potential for environmentally friendly coatings, offering new insights for waterborne coating development.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Bing Yin,Youqing Hou,Xiaoyue Jia,Fangyu Fan,Pan Wang,Ditao Niu,Dongshuai Hou
To enhance the stability of epoxy (EP) coatings on steel bars while improving their active and passive corrosion protection properties, the functional composite coatings were designed and prepared. Intercalated zirconium phosphate nanofillers (LCZrP) loaded with corrosion inhibitors were firstly synthesized and designed, and then were integrated into silane coatings (SC), which were preapplied to the bar substrate to enhance the integrity and interfacial adhesion properties. Lastly, an epoxy layer was applied, resulting in the functional composite coatings (LCZrP/SC/EP). The chemical composition and surface morphology were performed using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDS). The corrosion resistance of the coatings was evaluated using electrochemical impedance spectroscopy (EIS), complemented by adhesion tests to analyze the service stability of the coatings. The findings revealed that the silane interlayer notably improved the interfacial bonding at the junction where the epoxy resin interacts with the steel bar, thereby enhancing the corrosion resistance. Notably, the coating presented the optimal corrosion resistance when the nanofiller content was 0.04 wt.%. The impedance modulus at 0.01 Hz (|Z| 0.01Hz ) for the LCZrP/SC/EP coated coating was 5.05 × 10 10 Ω·cm 2 , which was two orders of magnitude greater than that of the EP coatings and the EP coating with silane interlayer (SC/EP) by one order of magnitude. Following 30 days of immersion, its |Z| 0 . 01Hz remained higher than the EP coating as well as the SC/EP coatings. The integral LCZrP/SC/EP coatings exhibit excellent long-lasting corrosion protection, owing to the self-responsive characteristics of LCZrP, the interfacial adhesion of the LCZrP/SC interlayer, and the enhanced barrier effect of the EP coatings. This combination effectively integrates active and passive protection strategies, thereby preventing metal corrosion. The above solution ensures that the coatings provide durable and reliable protection against corrosion over extended periods.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Chao Guo,Juan Peng,Qiuxia Peng,Xian Li,Jiajun Ma,Xu Ye,Junxiao Yang
In the era of high-frequency 5G technology, the exigency for copper clad laminate (CCL) substrate materials of unparalleled performance has grown exponentially. These materials necessitate possessing not only a diminutive dielectric constant, elevated thermal stability, and robust mechanical properties but also an inherent flame-retardant nature to ensure utmost safety and unwavering stability. However, conventional phosphorus-based epoxy systems, erstwhile employed as CCL substrate materials, have proven inadequate in meeting the demands of high-performance applications. Consequently, the development of novel phosphorus-based flame-retardant systems has become an imperative pursuit. In this study, we synthesized a series of flame-retardant cured resins by incorporating octavinyloctasilasesquioxane ((vinyl) 8 -POSS) and DVSBCB prepolymers (pDVSBCB) into three different BCB functionalized phosphorus-containing monomers (Ph 2 POB, PhPOB 2 , and POB 3 ), followed by thermal curing. Among these cured resins, POB 3 /BCBNPs/(vinyl) 8 -POSS/pDVSBCB (M4) exhibits remarkable properties, including an extremely low dielectric constant ( D k : 2.53) and dielectric loss ( D f : 2.09 × 10 −3 ), excellent thermal stability with a T 5% value of 451°C, a coefficient of thermal expansion (CTE) of 19.94 ppm/°C over the temperature range of 30°C–300°C, a high thermal release (THR) value of 31.6 kJ/g, and superior mechanical characteristics, such as an elastic modulus of 22.96 GPa and a remarkable hardness of 1.46 GPa. These exceptional properties position M4 as a promising candidate for the development of advanced CCL substrate materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Feng Qi,Shaolong Li,Zengqiong Zhao,Liyufen Dai,Chunyang Di,Yutong Li,Jinbin Wang,Hongjia Song,Jing Chen,Zhao Fu,Xiangli Zhong,Xiaoping Ouyang
Polyurethane elastomer (PUE) is extensively used for impact protection owing to commendable strength and toughness. However, PUE suffers from insufficient energy absorption and easy cracking under high-speed impact. Herein, hybrid nanomaterials (MMT/CNTs), formed by combining functionalized carbon nanotubes (CNTs) and organically modified montmorillonite (MMT) through ionic bonding, were incorporated into PUE, which enhances the impact resistance significantly under high-speed conditions. The enhancement of the impact resistance of the PUE composites was ascribed to the hybridization of CNTs and MMT, which facilitated the dispersion of each other in the matrix. Meanwhile, the CNTs anchored in the MMT interlayer can effectively support the interlayer space and promote internal stress and heat transfer. The results revealed that incorporating CNTs expanded MMT's interlayer spacing to 3.84 nm. Compared to pure PUE, the composites containing 2 wt% MMT/CNTs showed an increase in compressive strength, modulus of elasticity, dynamic compressive strength, and energy absorption by 61.0%, 111.6%, 73.8%, and 49.0%, respectively. This work shows that the PUE-MMT/CNTs is expected to be used as a high-performance impact-resistant material in aerospace, military defense, and other high-speed impact fields.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ying Zhang,Zheng Fang,Mingwei Wang,Chaolu Niu,Zhe Liu,Qichang Liu,Wenxu Tang,Jiameng Xu,Qiulin Chen,Potao Sun
Recent advances in microencapsulation technology have emerged as a promising approach for achieving self-healing of electrical and mechanical damage in epoxy resin. Nevertheless, current implementations face dual challenges: (1) Dependency on external stimuli (elevated temperature, pH variations, or humidity) for microcapsule activation, precluding non-contact self-healing mechanisms; (2) Compromised matrix performance through reduced mechanical strength and dielectric integrity. To address these issues, this work innovatively presents a method to fabricate magnetic-targeted natural photosensitive microcapsules. By incorporating Fe 3 O 4 @SiO 2 magnetic nanoparticles into the shells of photosensitive microcapsules via interfacial polymerization with a core-shell structure, the microcapsules gain targeting migration ability and UV shielding function. The resulting magnetic-targeted UV light-sensitive microcapsules/epoxy composite insulating materials can achieve non-contact damage repair using natural light. Moreover, the magnetic targeting enables directional migration of the microcapsules to the damage site in the matrix, significantly enhancing their utilization rate. Results show that, at a microcapsule doping concentration of 2 wt%, the tensile properties of the epoxy resin increased by 16.3% compared to pure epoxy resin, with minimal change in insulation strength and dielectric properties. Furthermore, the magnetically targeted natural photosensitive microcapsules can effectively repair surface cracks and electrical tree damage in epoxy resin, restoring the composite material's insulating property to 92.1% of its pre-damage state after self-healing.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shucheng Liu,Bo Li,Xiangxiang Huang,Zhe Kong,Guiqing Cheng,Zhongwei Wang,Qing Yu,Shihui Han,Long Chen
Carbon black/SiO 2 /LLDPE (CB/SiO 2 /LLDPE) is a commonly used polymer material with a positive temperature coefficient (PTC). However, the inferior reproducibility of PTC significantly restricts its service life. The objective of this study is to enhance the PTC reproducibility of CB/SiO 2 /LLDPE material. Polyethylene glycol (PEG) was chosen as the additive, and its effects on SiO 2 dispersion, PTC reproducibility, and electrothermal performance were studied in detail. A more stable SiO 2 /CB synergistic filler network was formed after the incorporation of PEG, which results in a significant improvement in PTC reproducibility. The variation of PTC intensity change rate after 10 heating–cooling cycles decreased by 19.4% after the incorporation of 5 wt% PEG. Additionally, the electrothermal performance of the PEG modified CB/SiO 2 /LLDPE composites was also enhanced with a 15.3°C increase in equilibrium temperature under a DC voltage of 140 V. This study offers an effective strategy for developing high-performance PTC materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhuqing Li,Shicong Pei,Kaixuan Shao,Xiaojun She,Mingdi Yang,Kehua Zhang,Hang Li,Yunsheng Ding,Xianhai Hu
Excitation wavelength-dependent fluorescent materials are a class of materials whose fluorescence emission spectra drift significantly with excitation wavelength. Herein, carbon nitrides (CNNPs) emitting blue fluorescence were synthesized by a one-pot method using urea as a conjugated monomer and L-phenylalanine as a co-precursor. Waterborne polyurethane-based carbon nitride (CNNPs-WPU) with excitation wavelength-dependent fluorescence properties was produced by accessing amino(-NH 2 )-rich CNNPs to waterborne polyurethane (WPU) using a modified acetone method. The results show that CNNPs-WPU has good storage and thermal stability. The fluorescence quantum yield (15.8%➔17.6%) and fluorescence lifetime (5.441 ns➔8.305 ns) of CNNPs-WPU were higher than those of CNNPs. It is worth mentioning that between 310 and 390 nm, with the rising excitation wavelength, the emission wavelength of CNNPs-WPU redshifts from 411 to 443 nm, CNNPs-WPU exhibits obvious excitation wavelength-dependent fluorescence characteristics, and the emission intensity increases with the increase of excitation wavelength, which makes it potentially applicable in the fields of anticounterfeiting, bioimaging, and light-emitting devices, etc. Moreover, the CNNPs-WPU uses water as the dispersed phase, which is green and environmentally friendly; it has a broad application prospect.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Chenrui Zhang,Qingchuang Lu,Meng Song,Zhenyang Luo,Lei Duan,Yanlong Luo
Many high-strength polyurethane materials have been developed in the past, but combining other functionalities such as high transparency, adhesion, and self-healing properties is still a great challenge. We prepare a mechanically robust polyurethane elastomer with high transparency and self-healability. The relationship between its structure and properties is elaborated. Acylsemicarbazide (ASCZ) and urethane groups are introduced into the hard segments of the polyurethane elastomer, and by modulating the spacer groups between the ASCZ and urethane groups, the fine modulation for the hydrogen bonding density and the hard domain size is realized. By the exquisite regulation of molecular structure, the HMDI-SPH elastomer with sebacic dihydrazide (SPH) as the chain extender, polytetramethylene ether glycol (PTMEG) as the soft segments, and methylene-bis(4-cyclohexyl isocyanate) (HMDI) as the isocyanate can achieve a high elasticity due to the rich and hierarchical hydrogen bonds. Such hydrogen bonds impede the crystallization of PTMEG and facilitate the formation of homogeneously distributed hard-phase microdomains. The HMDI-SPH elastomer exhibits good mechanical robustness (tensile strength of 45.7 MPa, toughness of ~140.8 MJ m −3 ), transparency (transmittance > 95%), and self-healing (self-healing efficiency of 86.6%). Meanwhile, HMDI-SPH has good adhesive strength on a variety of substrates such as walnut (~10.81 MPa) and steel (~14.60 MPa).
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhiyuan Zhang,Yan Wang,Chen Wang,Fangzheng Yu,Yang Yuan,Zheng Zhao
Self-healing hydrogels have become a hot research topic in the field of wound care due to their ability to prevent secondary damage to the dressing and reduce the risk of wound infection. The aim of this study was to develop a hydrogel network system with excellent self-healing and antimicrobial properties, which is particularly suitable for wound dressing applications. The hydrogel stability was enhanced by forming long chains through lipoic acid (LA) disulfide bonding and inhibiting chain depolymerization via polygallic acid (PGA)-mediated S Ar bonding. In addition, poly(lysine) (PL) was doped into the system through electrostatic interactions to further enhance the structural strength and antimicrobial properties of the hydrogels. This noncovalent gel system endowed the hydrogels with softness and fluidity, enabling them to adapt to various wound shapes. Through experimental results, it was shown that the hydrogel not only possessed enhanced mechanical strength and remarkable self-healing ability, but also exhibited good cytocompatibility. Antimicrobial tests have shown that it is more than 99.9% effective against Escherichia coli and Staphylococcus aureus . Thus, PLA/PGA/PL hydrogel with remarkable self-healing, antimicrobial, and biocompatibility properties shows great potential for application as wound dressings and becomes a strong candidate in the field of hydrogel dressings.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xinxin Fu,Yufeng Li,Jian Ye,Mingwei Ge,Yu Zhang,Yahui Han,Hailin Yu,Jinjun Deng,Yunan He,Yanbin Tong,Hongsheng Liu
The development of fracturing fluids is pivotal for optimizing oilfield production, with polymer-based fracturing thickeners emerging as a principal focus of research owing to their superior rheological properties. In this investigation, polyacrylamide emulsions were synthesized through inverse emulsion polymerization, utilizing water glass and silane-modified water glass as the modifying agents. A comprehensive assessment of their performance was conducted. The findings demonstrated that polymer systems containing 0.2% sodium metasilicate and 0.03% silane-modified sodium metasilicate exhibited remarkable rheological behaviors. Specifically, the apparent viscosity increased by 25% and 40%, respectively, while shear recovery tests revealed enhancements in shear viscosity of 26% and 90% at low shear rates. Furthermore, at a proppant concentration of 20%, the proppant transport capacity of these two enhanced systems improved by 58.63% and 67.22%, respectively. This enhancement is likely attributable to the high bond energy of the silicon–oxygen (Si–O) bonds in water glass, which imparts greater structural stability to the polymer. The incorporation of silane-modified water glass further improves the dispersion and compatibility within the polymer matrix. The results offer a robust theoretical foundation for its use as a fracturing thickener.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 22
·e56947
·
IF 2.8
Li Gao,Haihong Gu,Chao Ye,Chunxia Wang,Zimin Jin
A superhydrophilic polylactic acid (PLA) fiber membrane was fabricated by developing a hydrophilic silica surface layer on electrospun fibers. The drawn fibers were twisted and activated in an ethanol solution, leading to the shrinkage of the membrane and enhancing surface hydrophilicity, as well as reducing the pore size of the membrane. Through the coupling of 3-aminopropyltriethoxysilane, silica was polymerized in situ on the fiber surface of the electrospun PLA membrane to achieve a superhydrophilic surface. The membrane underwent degradation in a sodium hydroxide aqueous solution at a rate of 2.240 min −1 . The membrane was employed for separating surface-stabilized oil-in-water emulsions. The oil droplet sizes in the filtrates were 93, 169, and 132 nm, respectively. The water flux of the membrane for ionic oil-in-water emulsions reached 3205 L·m −2 ·h −1 , attributed to the electrostatic effect on the membrane surface (35.35 eV) and the sieving effect of the pore channel (0.918 μm). In contrast, the water flux for nonionic emulsions was only 350 L·m −2 ·h −1 . Furthermore, after immersing the membrane in the hydrolysis of tetraethyl orthosilicate again, the oil retention rate remained at 98.6%, and the water flux recovery rate was sustained at 96.3% over 30 cycles of separating oil-in-water emulsion.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yuhang Du,Yuanshan Cheng,Mingyao Zhang,Baijun Liu
Styrene–acrylonitrile copolymer (SAN) is widely used in various industries due to its excellent transparency, rigidity, and chemical resistance, but its brittle properties limit its utilization and development in niche areas. To improve the brittle properties of SAN resins for more applications, different PBA latexes were synthesized in this study by semicontinuous emulsion polymerization, and two key factors affecting the toughening effect of the resins, particle size and gel content of the poly butyl acrylate (PBA) rubber particles, were effectively and easily controlled. It was found that the crosslinker content and monomer dropping time could control the gel content of PBA latex, while the particle size of the latex was affected by the emulsifier distribution ratio and monomer dropping time. In addition, acrylate styrene acrylonitrile (ASA) resins were constructed by blending PBA-g-SAN graft copolymers with SAN resins, and impact strength tests were conducted to demonstrate the toughening effect on SAN resins. The experimental results show that the gel content can be as low as 73.03%, the particle size varies from 200 nm to 530 nm, and the maximum impact strength of ASA resin reaches 6.17 kJ/m 2 .
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高影响因子
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