JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 38
·e55968
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IF 2.7
Meili Li,Xiancheng Meng,Zaizai Tong
Poly( L -lactic acid) (PLLA), as a green, biodegradable polymer material, has garnered considerable attention due to its ease of processing and exceptional properties. However, the inherent slow crystallization rate and brittleness of PLLA substantially restrict its extensive applications across various domains. In present work, PLLA and poly( D -lactide) (PDLA)-modified cellulose nanocrystals (CNCs), referred as CNC- g -L and CNC- g -D, are serving as nano-fillers to enhance the crystallization rate of PLLA. Our findings demonstrate that both nano-fillers could enhance the crystallization rate of PLLA, but the CNC- g -D shows a more efficient nucleation agent compared with its counterpart, CNC- g -L. Isothermal crystallization analysis indicates that CNC- g -D substantially increases nucleation density of PLLA, with pronounced crystallization at an elevated temperature of 155°C as confirmed by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Wide-angle x-ray diffraction (WAXD) analysis shows the preformation of stereocomplex crystals on the CNC- g -D surface may result in a fast crystallization rate. Meanwhile, after incorporation of different nano-fillers, the toughness property of PLLA has also been significantly enhanced. Our result has shown the CNC- g -D could serve as an efficient nucleation agent toward PLLA and also facilitate to aiding in establishing comprehensive structure–property relationships of polymer materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Wenke Gao,Liyun Guo,Bingxiang Li,Kai Liu,Jing Hua
High-damping rubber materials are essential for fabricating high-performance green tires due to their distinct advantage of low noise and vibration, good auto-braking, and service life. However, the poor interfacial compatibility between the common nonpolar tread rubber materials and polar polymers/fillers severely restricts the development of high-damping rubber composites. Herein, we prepared a multi-functionalization high vinyl polybutadiene rubber (MFHVBR) without gel formation by anionic reaction. This significantly enhanced the interaction and compatibility with the high-damping ethylene-vinyl acetate (EVA) rubber. The interfacial potential energy of the MFHVBR/EVA blended system is nearly five times lower than that of the high vinyl polybutadiene rubber (HVBR) and EVA blended system, as certified by the molecular dynamics (MD) simulations. At an optimized MFHVBR/EVA weight ratio of 8:2, the composites demonstrate significantly improved damping performance without sacrificing the vulcanization rates and mechanical properties. The effective damping temperature range (tanδ > 0.3) from −11.1°C to 56.7°C totally covered the service temperature of tires and is also among the highest values for the reported tread rubber materials. The interfacial potential energy used for predicting the interfacial compatibility between the nonpolar rubbers and polar polymers/fillers provides insights for realizing high-damping rubber composites.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 4
·e56404
·
IF 2.7
Song Li,Lingbo Dong,Jinyi Jia,Licong Jiang,Zhenxiang Xin,Wei Liu,Lin Li
A large amount of smoke will be produced during the combustion of ethylene propylene diene monomer(EPDM), which seriously endangers the environment and personal safety. In this study, K-SEP was obtained by modifying sepiolite with KH550, and two bio-based flame retardant and smoke suppression systems AEGS and PEGS were prepared by combining ammonium polyphosphate intumescent flame retardant system (AEG) and piperazine pyrophosphate intumescent flame retardant system (PEG), respectively. The flame retardant and smoke suppression properties of AEGS and PEGS on EPDM matrix composites were investigated. The experimental results show that the LOI values of EPDM/AEGS3 and EPDM/PEGS3 composites with 3 phr K-SEP are 8.1% and 5.5% higher than those of the blank samples without sepiolite. TSP decreased by 26.3% and 14.3% respectively, which proved that sepiolite has important research value in the field of flame retardant and smoke suppression of polymer materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 4
·e56396
·
IF 2.7
Taineng Zhou,Caili Yu,Le Yang,Wei Liu,Tuanhui Jiang,Xiangbu Zeng,Kuanchun Shen,Bo Jin,Chun Zhang,Li He
Low toughness and brittleness limit its application range of thermosetting epoxy resin (EP) based foams. In current research, inorganic particles are commonly utilized as heterogeneous nucleating agents to enhance foaming quality and EP toughness. However, the increasing inorganic particle content usually leads to particle agglomeration, which negatively impacts foaming quality and reduces EP performance. Block copolymers, which appear as liquid to effectively mitigate agglomeration, are employed as toughening materials for EP. In this study, a small number of modified calcium silicate particles (MCS) were used as anchor points to induce the distribution of block copolymers (P-F68) to improve EP toughness and effectively enhance cell nucleation, thus, EP/MCS/P-F68 foams performance was improved. The research results showed that EP foams obtained excellent cell structure and very small foam density (0.256 g/cm 3 ) at the P-F68 content of 10 wt%. The continuous increase of P-F68 content would lead to the thickening of cell wall and the increase of cell size. Simultaneously, the core-shell structure formed by P-F68 in EP effectively enhanced the toughness of EP foams and mitigated its brittleness, offering crucial theoretical guidance for toughening and regulating the cell structure of EP foams.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 24
·e55504
·
IF 2.7
Denghui Ren,Shilin Deng,Yanying L.V.,Cao Li,Qingzhao Yang,Fang Lai,Jing Li
In this study, an eco-friendly approach is presented for the innovative use of waste oyster shell (OS) powder modified with zinc stannate, aliphatic alcohols, and silane coupling agents blended with styrene-butadiene-styrene (SBS) modified asphalt to make a flame-retardant binder (modified oyster shell [MOS]/styrene-butadiene-styrene [SBS]/MA), which is rendered flame retardant and smoke suppressive. Compared with the original SBS/MA, MOS/SBS/MA with a 2% addition rate showed a 35.44% increase in ultimate oxygen index, a 30.62% reduction in peak exotherm, a 10.87% reduction in smoke density, and a 75% reduction in volatile organic compound (VOC) emissions. It also has excellent mechanical properties, with increases in composite modulus, elastic modulus, and storage modulus of 68.58%, 97.29%, and 59.59%, respectively, at 46°C. The thermal stability of MOS/SBS/MA is also improved, with a decomposition temperature 26°C higher than that of SBS/MA. Pavement performance tests show that the water-soaked Marshall's split strength has increased by 3.87% and the coefficient of rutting by 3.51%. Increased by 3.51%, this method effectively utilizes the waste OS, improves the fire-retardant properties of asphalt while retaining the mechanical properties of the modified asphalt binder, and provides a model for developing sustainable fire-retardant asphalt in coastal areas.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 33
·e55836
·
IF 2.7
Bo Zhu,Shengkun He,Hao Sun,Ximu Han
In order to suppress the damage of cable insulation caused by water tree structure formed by micro-droplets at insulation defects in low density polyethylene (LDPE) materials under AC electric field. In this paper, the siloxane group is grafted onto LDPE by melt grafting method, and different content of comonomer styrene (St) is added to improve the grafting rate of siloxane group grafted polyethylene. The effect of St on the microscopic characteristics of LDPE grafted KH570 is studied. In order to verify the accuracy and timeliness of water tree self-healing of grafted polymer insulation materials, the microstructure characteristics of LDPE ungrafted and grafted polymer samples are analyzed by Fourier transform infrared spectroscopy, gel content test, and differential scanning calorimeter. Second, the AC dielectric properties of LDPE ungrafted and grafted polymer samples are studied by AC breakdown experiment and space charge test. Finally, the water tree length, micropore defects, and self-healing of the samples are observed by optical microscopy and polarization and depolarization current method, and the changes of chemical composition in the water tree area before and after aging are analyzed by infrared spectroscopy. The principle and mechanism of repairing water tree defects with grafted monomers are explained. This paper not only combines the previous research results of self-healing materials, but also provides a new method for the preparation process of LDPE grafted polymer, which has a good research prospect in practical application.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 27
·e55612
·
IF 2.7
Yifan Wang,Zhiqiang Yu
In this work, a technique for constructing a three-dimensional (3D) skeleton of hexagonal boron nitride (h-BN) using sugar as the fulcrum and preparing composites by embedding in the epoxy (EP) in a vacuum environment is proposed. The study of thermal conductivity (TC) in polymer composites is conducted through a blend of techniques: laser flashing, theoretical modeling, and finite element simulation. The h-BN skeleton exhibits a honeycomb structure through the scanning electron microscopy findings. Further investigation using finite element simulation demonstrates that conductive networks are formed by the h-BN skeleton within the composites, leading to a notable enhancement in TC. Specifically, the composite for h-BN/EP reaches a TC of 2.25 W/m K when composed of 52 vol% h-BN. A dielectric loss of 0.008 for the composite with the same h-BN loading shows a considerable improvement. The compressive yield strength of the 3D h-BN/EP composites reached 312 MPa at 5 vol% h-BN loading.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Mingchao Wang,Yuan Wang,Xin Chen,Li Liu,Yetao Zhang,Chen Liu
Compared to the traditional open mixing process used for the production of the rubber composites, wet mixing process is a lower shear force mixing method. This article revealed the influence of the open mixing process and the wet mixing process on the microstructure, density, mechanical properties, and ablation performance of ethylene propylene diene monomer (EPDM) rubber/fiber/hollow glass microsphere composite system. The results showed that the wet mixing process increased the fiber length by more than 300% compared to the open mixing process, while the fragmentation rate of the hollow glass beads was reduced by 94.4%, these effectively maintained the structural integrity of the fibers and the hollow glass microsphere filler. By using the wet mixing process, the density of EPDM composite materials can be reduced by about 20%, and the tensile strength and ablation resistance of these composites were also significantly improved. Compared to polyimide fiber and aramid fiber short fibers, the wet mixing process of solution-based rubber had a more significant effect on improving the length and ablation resistance of phenolic fiber and carbon fiber fibers which having poor shear strength.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhuqing Wang,Yiyang Li,Yupu Meng,Zhiwei Huang,Min Wang
This research employed a simplistic approach to modify polydimethylsiloxane (PDMS) and graphene oxide (GO) onto the surface of the PU skeleton, and then synthesize an oil–water separation material (rGO@PDMS/PU) with photothermal conversion performance and superoleophilic/superhydrophobic properties through high-temperature reduction. The synthesized rGO@PDMS/PU can adsorb organic solvents or oil that are 19–37 times its own weight, while also having a 99.1% oil–water separation efficiency. Additionally, rGO@PDMS/PU also has good photothermal conversion ability. Under the intensity of 1 sunlight ( q = 1 kW m −2 ), its surface temperature can reach 95.4°C within 10 s. Relying on the excellent oil–water selectivity and photothermal conversion capabilities of rGO@PDMS/PU, we also build a novel oil-gathering device that can successfully make oil recovery on the water surface in situ. When the device is under light conditions, its crude oil recovery efficiency is nearly four times higher than when there is no light. Therefore, this new oil-gathering device has broad application prospects in high-viscosity oil leakage incidents such as crude oil and engine oil.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Peifan Qin,Deqi Yi,Jianwei Hao,Ming Gao,Xuewei Cao,Qixing Sun,Jin Zhou
To improve the flame retardancy, mechanical and dielectric properties of epoxy resin (EP), promoting the application in aeronautic industry and other fields, molybdenum disulfide-melamine trimetaphosphate (MoS 2 -MAP) crystallite composites are synthesized. The chemical, crystalline structure and thermal stabilities of MoS 2 -MAPs are thoroughly characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and thermo-gravimetric analysis (TGA) techniques, respectively. The morphologies of EP/MoS 2 -MAP composites are assessed by SEM, thermal stability by TGA, fire retardancy by limiting oxygen index test (LOI), vertical burning standard test (UL-94), and cone calorimeter tests, mechanical properties by stress strain tests, and dielectric properties by impedance analyzer. Compared with pure EP, the mechanical, dielectrical properties, thermal stabilities and flame retardancy of EP/MoS 2 -MAP composites can be significantly improved due to the good dispersibility of MoS 2 and MAP in matrix. While, the properties of EP/MoS 2 -MAP composites can be further adjusted by controlling the mass raito of MoS 2 and MAP in MoS 2 -MAP crystallite. EP with 4 wt% of MoS 2 -MAP-50% (P content: 0.30%) shows the lowest dielectric constant and dielectric loss values on the basis of good flame retardancy and mechanical properties. The results show that the MoS 2 -MAP crystallite composites can promote the application of EP composites in aeronautical devices, radar detection and other fields.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ying Zhang,Mingwei Wang,Ran Zhuo,Wenxu Tang,Chaolu Niu,Qiulin Chen,Weihong Yang,Sicheng Zhao
Epoxy resin insulation materials are prone to micro-damage such as scratches and electrical treeing, which can lead to a decline in insulation performance and threaten the safe operation of the entire system. Microcapsule-based self-healing technology is one of the most promising solutions to address the micro-damage issues of epoxy resin. However, research has shown that when the microcapsule doping concentration exceeds 3 wt%, the mechanical strength decreases significantly, while a too low doping concentration affects the healing efficiency. This paper focuses on epoxy resin used in insulator core rods and addresses the contradiction between “low microcapsule introduction” and “high healing efficiency.” This work synthesizes magnetically targeted UV-sensitive microcapsules suitable for self-healing insulator core rods. During the curing process of the epoxy resin, the microcapsules can be directionally guided by a magnetic field to distribute in areas prone to damage, thereby ensuring repair efficiency while reducing the quantity of microcapsules used. The microcapsule shells possess UV-shielding properties, ensuring the stability of the internal repair core material. When damage propagates to the capsules, the core material flows out and cures under UV light, completing the repair of the damage. Additionally, larger-scale self-healing epoxy rod specimens were fabricated, demonstrating excellent self-healing performance against mechanical scratch damage and electrical treeing damage. In comparison, composite materials without microcapsules exhibited a reduction in tensile strength and breakdown strength to 69.06% and 74.77%, respectively, after mechanical damage. Post-repair, the mechanical strength recovery rate reached 91.6%, and the breakdown strength recovery rate achieved 90.4%.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Na Li,Xinyi Zhou,Yutong Cao,Junrong Yu,Yan Wang,Zuming Hu
Aramid fibers (AFs) with high strength and modulus have a vital application in harsh outdoor bulletproof protection and ship ropes; however, solar radiation, especially ultraviolet (UV) radiation, is one of the main factors for affecting their service life. Herein, different zinc oxide (ZnO) nanostructures were constructed on the surface of AFs by the growth of ZnO nanowires (AF-ZnO NW) and coating of waterborne polyurethane/ZnO nanoparticles composite emulsion (AF/ZnO), respectively. The surface functionalized AFs exhibited enhanced mechanical properties retention after UV radiation. Nevertheless, the tensile strength of AF-ZnO NW before UV aging was already lower than the tensile strength of original AFs due to the surface structure damage from chemical grafting modification. The tensile strength and elongation retention rates of AF/ZnO-5% reached 74.4% and 84.4% after UV exposure for 168 h, respectively, which were much higher than the value of 48.3% and 60.5% of the neat AFs. These results provide an effective and low-cost strategy for improving the UV-resistance of advanced high-performance fibers.
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高影响因子
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