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.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 47
·e56255
·
IF 2.7
Jin Yang,Yixuan Hou,Yingzheng Hong,Yingbang Yao
Since thermally conductive fillers easily aggregate when introduced into polymer matrix, it is essential to apply a modifier to enhance the dispersion of the filler. In current study, the surface of boron nitride (h-BN) is firstly modified by employing a double modification process and then added into sulfonated polyetheretherketone (SPEEK) to form the composite materials. Four different kinds of samples of double-modified h-BN were obtained. Ultimately, the XXX@h-BN/SPEEK (XXX denoted as modifier, i.e. PDA, VTMS, TEOS, and APS) flexible film with the horizontally oriented XXX@h-BN was produced by heating the mixture under an external electric field. The test results indicate that the thermally conductive filler PDA@h-BN (PDA: polydopamine), which was prepared by modifying OH@h-BN with PDA, loaded into SPEEK, and electrically oriented, shows the best overall performances. With a high tensile strength of 43.24 MPa and good flexibility, PDA@h-BN/SPEEK flexible film exhibits an in-plane thermal conductivity of 2.3 Wm −1 K −1 at a filling ratio of 10 wt%. The sample may be bent at a steep angle without breaking down and can recover to original shape bearing its high degree of flexibility.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 39
·e55999
·
IF 2.7
Lihui Yao,Yuzhu Li,Ya Li,Yajuan Wang,Linghui Wang,Dan Qiu,Yunxuan Weng
Benzophenone (BP) and N-vinylpyrrolidone (NVP) were used to modify the surface of polylactide (PLA) films by UV grafting method. The effects of light distance, temperature, reaction time, and modifier concentration on the structure and properties of PLA films were investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance spectroscopy, differential scanning calorimetry (DSC), and universal testing machine (UTM). With BP and NVP UV grafting, the hydrophilicity of PLA films is improved, but their thermal and mechanical properties are reduced under different surface modification condition. Base on the principle of good surface hydrophilicity, better mechanical and thermal properties, the hydrolytic degradation performance of modified PLA films in artificial seawater at 70°C was studied by scanning electron microscopy, XPS and DSC. The research results show that the degradation of modified PLA films mainly occurs in the amorphous region, and the degradation process conforms to surface hydrolysis mechanism. The grafting modification of NVP is better than BP to accelerate the degradation process of PLA films in artificial seawater. The degradation of modified PLA undergoes water molecule erosion and autocatalytic degradation reaction. The degradation of BP-PLA obeys the first-order kinetics in part, while the degradation of NVP-PLA is more complex. Therefore, surface hydrophilicity modification is an effective technique for improving the degradability of PLA.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Qianjie Zhang,Pingli Wang,Dongmei Zhang,Shilian Zheng,Wanping Zhang
Hyaluronic acid (HA) is a mucopolysaccharide alternately linked by glucuronic acid and n -acetylglucosamine, which is usually used as a moisturizer in cosmetics. In this study, HA derivative (FA-HA) was prepared by modifying sodium hyaluronate with ferulic acid (FA). The chemical and morphological structure of FA-HA were characterized by UV, FTIR, 1 H-NMR, DLS and TEM. The results showed that FA was grafted onto HA chains via ester bonds and self-assembled into nanoparticles in aqueous solution. The introduction of FA endowed the nanoparticles with antioxidant function. The FRAP value of 10 mg/mL FA-HA was 1.985 mM, and the clearance rate of O 2 − , DPPH + and ABTS + could reach 83.13%, 88.86% and 99.48% respectively. Moreover, FA-HA can be used as Pickering emulsifiers to stabilize the emulsion. The results showed that the size of emulsion droplets decreased as the concentration of FA-HA increased. When the mass ratio of oil to water was 7/3, the emulsion droplets were the smallest. The addition of sodium chloride will increase the size of emulsion droplets, destroying the stability of the emulsion. In addition, FA-HA was also universal and was capable of emulsifying alkanes, esters, and natural oils, which was expected to be applied in the cosmetics and food fields.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Shujuan Yu,Xiang Deng,Cailong Deng,Jing Xia,Qilong Li
In this paper, a novel broad-spectrum chitosan polymer carbon dots-based UV absorber ((CS-PCDs)-g-UV-0) was obtained by grafting UV-0 onto chitosan-based polymer carbon dots (CS-PCDs) through a simple green microwave method to achieve the macromolecular quantification of UV-0 UV absorbers. The products were characterized by means of IR spectroscopy, NMR carbon spectroscopy, UV absorption spectroscopy, TGA, and XPS. Finally, the UV absorber was applied to natural rubber (NR), and its anti-UV aging properties were systematically investigated by conducting UV-accelerated aging experiments on the carbonyl index, weight loss rate, contact angle, and SEM morphology of the NR materials added with (CS-PCDs)-g-UV-0 before and after aging. The results showed that after 28 days of aging of NR added with 2% (CS-PCDs)-g-UV-0, the increase in carbonyl index was considerably less significant than that of pure NR samples, as was the change in contact angle. According to the observations made by SEM, the addition of this (CS-PCDs)-g-UV-0 caused a significant delay in the occurrence of cracking on the surface of the material. In summary, a novel UV absorber is proposed in the present study to enhance the performance of NR in UV aging resistance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Hongbo Xiao,Xin Huang,Wanyu Huang,Yufei Peng
In order to improve the flame retardancy, smoke suppressing, and mechanical properties of epoxy resins (EP), while pursuing low toxicity, environmental protection, and sustainable development, a reactive biobased flame retardant (TVD) containing P/N was synthesized by the one-pot method. The flame retardant, consisting of vanillin, 2,4,6-triaminopyrimidine, and DOPO as reactants, contained reactive groups in its structure and was introduced as a co-curing agent into the DDM-cured EP system. EP/TVD10 (at a phosphorus content of 0.58 wt%) achieved a UL-94 V-0 rating with an increased limit oxygen index (LOI) value of 34.2% (26.5% for pure EP), and the cone calorimetric test (CCT) results showed a decrease in total heat release (THR) values of 33.8% and a decrease in total smoke production rate (TSP) of 21.1% compared to pure EP. In addition, the introduction of TVD improved the mechanical properties of the epoxy resin, with an increase in flexural strength and modulus of 8.7% and 6.5% and a slight increase in impact toughness for EP/TVD10. These results indicate that TVD is a multifunctional and efficient bio-based flame retardant, which provides new ideas for the development of high-performance modified epoxy resin materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Chonghui Li,Liyun Yu,Weizhen Zhao,Frederikke Bahrt Madsen,Anne Ladegaard Skov
Photoreversible, color-changing films have great potential in various optical applications. In this study, we developed a photochromic film by embedding droplets of metatitanic acid (hydrous TiO 2 ) and glycerol in commercially available poly(dimethylsiloxane) (PDMS) silicone elastomers. Benefiting from the electron–hole pair scavenging abilities of glycerol, the resulting film exhibited rapid photoresponse, high photoreversible stability, excellent antiaging capability, and remarkable stretchability. The degree of color changes upon ultraviolet (UV) irradiation was effectively controlled by adjusting both the concentration of hydrous TiO 2 (1–20 wt%) and UV irradiation time (5–30 min), thereby increasing total color-changing ability (Δ E ). High-resolution patterns could be repetitively printed, erased, and rewritten (≥20 times) with no significant loss of clarity. After a 30-day exposure to ambient air, there were no significant aging effects in the photochromic ability of the films, thus demonstrating promising potential as rewritable films for information storage.
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Wenjin Wang,Chuanjiang Zhou,Jiangping Guo,Yijia Yu,Wenjuan Xia,Zhaoqiang Wu,Hong Chen
With the demand for the development of lipid–polymer conjugates (LPCs) for biomedical applications, the development of novel, rapid, and efficient methods for the synthesis of LPCs is of great significance. In this study, a novel Y-type photoinitiator (Lipid-PI) containing a diacylglycerol group was first synthesized, and then the polymerization of conjugated vinyl monomers such as oligoethylene glycol methyl ether methacrylate (OEGMA) and N,N -dimethylacrylamide could be rapidly initiated by the Lipid-PI initiator under Mn 2 (CO) 10 and visible light radiation at room temperature to efficiently prepare LPCs. The 1 H-NMR results revealed that the diacylglycerol moiety resided at the terminal position of the LPCs molecular chain. Through dynamic light scattering and transmission electron microscopy techniques, it was found that the Lipid-POF (POF is defined as poly(OEGMA- co -FluMA)) prepared from OEGMA monomers can self-assemble into spherical micelles with a particle size of approximately 80 nm in pure water. Furthermore, the in vitro bioassay results illustrate that the prepared Lipid-POF not only can successfully modify the L929 cell surface but also has good biocompatibility. Overall, this study not only provides a fast and efficient method for synthesizing LPCs but also has broad application potential in the biomedical field.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 47
·e56261
·
IF 2.7
Jiayu Lin,Yongbo Hou,Lailong Ding,Yifan Wang,Jinhu Hu,Xishun Qiu,Chao Wu,Mingliang Ma,Wei Gao
Metal–organic frameworks (MOFs) have garnered significant attention in recent years due to their potential application in flame-retardant polymeric materials. In this work, Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 flame retardants were synthesized via solvothermal and calcination techniques, and their elemental composition and morphologies were thoroughly characterized. The flame retardancy of polyurea (PUA) composites incorporating varying dosages of these flame retardants was evaluated using cone calorimetry tests (CCT). The findings demonstrate that the incorporation of Fe 2 O 3 /ZnFe 2 O 4 /g-C 3 N 4 @ZIF-8 significantly enhanced the flame retardant properties of PUA composites. With the addition of 3 wt% of the flame retardant, the peak heat release rate (PHRR), total heat release (THR), total smoke production (TSP), and total CO yield (TCO) of the PUA composites decreased to 890.82 kW/m 2 , 131.34 MJ/m 2 , 12.30 m 2 , and 2.39 g, respectively, reflecting reductions of 33.59%, 18.59%, 29.40%, and 47.93% compared with pure PUA. The flame-retardant mechanism was systematically analyzed in both the condensed and gas phases. This study provides a robust experimental foundation and novel insights that contribute to the development of advanced flame-retardant coating materials.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）