JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 47
·e54708
·
IF 3
Fangling Wang,Yuewang Zhu,Liuye Wang,Kai Ren,Juan Li,Chengzhong Wang,Shengling Jiang
Polyurethane is the main matrix material of polymer damping materials, but the damping temperature range is narrow, the effective damping temperature range does not match the working temperature of the material, and the elastic modulus is sensitive to temperature during glass transition, which is not conducive to safe use in a wide temperature range. In this paper, the polyurethane gradient material with the hard segment content continuously changing along the length direction was designed and prepared by the reaction injection method. Dynamic mechanical analysis (DMA) shows that the gradient structure greatly influences the comprehensive damping performance of polyurethane. While maintaining no significant decrease in mechanical properties, the gradient material extends the effective damping temperature range (TR) from 40.7°C (−32.3 ~ 8.4°C) for component A and 66.6°C (59.5 ~ 126.1°C) for component B to 139.5°C (−20.6 ~ 118.9°C). At the same time, the damping peak remains high (0.48), which is close to the higher damping peak of the B component of 0.56. The elastic modulus ( E ′) decreases slowly with the increase in temperature, which can better ensure the safety of the material.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 48
·e54734
·
IF 3
Haixiang Sun,Qi Jing,Yuhao Chen,Juan Liu,Haixing Ye,Ming Wang,Peng Li
Based on the solution-diffusion model of pervaporation (PV) technique, the development of thin-film composite membranes (TFC) with a highly hydrophilic surface and hydrophobic internal structure is more conducive to the rapid adsorption and desorption of water molecules to overcome the trade-off effect between flux and separation selectivity. Herein, the polyamide PV membrane was fabricated via interfacial polymerization (IP) with trimesoyl chloride (TMC) and polyethylenimine (PEI) as organic and aqueous phase monomer, respectively, on the hydrolyzed polyacrylonitrile (HPAN) substrate. Subsequently, the hydrophilic modification layer was prepared via sodium alginate (SA) crosslinking with Ca 2+ to form the egg-box network. The results indicated the optimized TFC membrane exhibited high separation factor of 525.1 with desirable permeation flux of 2083.9 g m −2 h −1 for the pervaporation dehydration 85 wt% ethanol/water solution at 70°C. The modification method of hydrophilic surface opens up new avenues for the preparation of PV membrane with high separation performance and low-cost.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 48
·e54722
·
IF 3
Jingxiang Wang,Min Li,Xunwei Liu,Jiangmin Yu,Dicheng Yang,Chunping Yuan,Xiaoying Yin,Yinan Yan
Magnetic hyperthermia generated by functionalized bone cement is a promising approach to treat postosteocarcinoma cancer regeneration. However, it is crucial to minimize the magnetic field intensity using localized high-caloric-generating nanoparticles to avoid the potential hazards of electromagnetic field exposure to living organisms. Herein, in situ hydrothermally synthesized CoFe 2 O 4 (CoFe) nanoparticles and boron nitride nanosheet (BNNS)–supported CoFe complexes (BNCoFe) are incorporated into polymethyl methacrylate (PMMA) cement to prepare a composite implant with high-intensity magnetic–thermal performance and safety. The results show that the CoFe nanoparticles (size = ~70 nm) anchored on BNNS surfaces exhibit a maximum magnetic–thermal ablation temperature of ~42°C within 50 s under an alternating magnetic field of 400 KHz (field frequency) and 30 Oe (field intensity) in vitro. Furthermore, the incorporation of BNNSs into the PMMA matrix notably increases the thermal conductivity of PMMA from 0.07 to 0.25 W mK −1 and improves its mechanical properties (compressive strength increases from 74.0 ± 1.6 to 81.0 ± 1.0 MPa), which is attributed to the crystalline structure of BNNSs in the PMMA matrix. Inductively coupled plasma analysis shows a considerably reduced Co 2+ ion release from PMMA/BNCoFe, indicating its potential as a safe implantation material for hyperthermia treatment.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 2
·e54782
·
IF 3
Jun Zeng,YingJun Li,YingChun Lu,YunPeng Li,HuiPing Liu,CongXiu Wu,MengXi Chen,Wei OuYang,YiPeng Zhang,YuanLin Zhou
As a “green” radiation protection material with the potential to replace lead oxide, bismuth oxide has more research applications in the field of γ protection. However, due to their different surface properties, there are compatibility and interaction problems between metal oxides and rubber. To enhance the performance of bismuth oxide in neoprene, Bi 2 O 3 @PCPA-KH590 was prepared by coating bismuth oxide with polyphenol/polyamine and grafting KH590 on the surface of bismuth oxide. This allows for creating more active sites with the help of polyphenol/polyamine, enabling KH590 to be grafted onto bismuth oxide particles. The S functional group on the silane coupling agent is then cross-linked with the rubber substrate, enhancing the dispersibility of the bismuth oxide powder. This improvement not only improves the dispersibility of the bismuth oxide powder but also enhances the mechanical properties of the rubber composite material. Compared with pure CR, the mechanical properties of 60 wt% filler-modified powder composites can still be maintained at a high level, with the tensile strength reaching 12.83 Mpa. In sum, the proposed method appears feasible for preparing highly filled radiation protection rubber-based materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 42
·e54649
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IF 3
Haoping Peng,Jiaxin Li,Yufei Gu,Changjun Wu,Ya Liu,Yonggang Zhao,Xuping Su,Zhiwei Li
A microencapsulated flame retardant PMDOPO was synthesized by solution blending method using EGDMA as initiator and AIBN as cross-linking agent. Rigid polyurethane foams were prepared in a one-step process. PMDOPO was incorporated into the foams by blending with polycarbonate diols (PCDL) and foaming additives. The results of Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) showed that PMDOPO was well formed and uniformly dispersed in the foam. The pore size and density of the foams first increased and then decreased with the addition of PMDOPO. X-ray photoelectron spectroscopy (XPS), vertical combustion test, and thermogravimetric analysis (TGA) showed that the PMDOPO content was directly proportional to the flame retardancy and the thermal stability. The major weight loss shifted to higher temperature intervals. The amount of residual char of RPUF/PMDOPO-25 was enhanced 50 times to 10.63% compared to pure RPUF. In addition, SEM and Raman analyses of the combustion residual char revealed that a phosphorus-containing char layer was formed during thermal degradation. The dense charcoal layer helps to insulate heat and suppress combustion. The universal testing machine showed that RPUF with 15 wt% content had the best compression resistance, with an enhancement of 1.8 MPa over pure RPUF.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 45
·e54643
·
IF 3
Jing Chen,Bengang Li,Xiaofeng Ma,Shuai Zhou,Qun Gu,Hua Bian,Zhenyang Luo
The flexibility and functionality of conductive hydrogels are crucial to applications under various scenarios and complex environments. Due to single functionality and weakness in mechanical properties, the application of conductive hydrogels in flexible wearable devices remains a challenge. In this study, lignin-graft-poly(acrylic acid) (LPAA) was incorporated into acrylamide (AM)/sodium chloride (NaCl) solution to fabricate composite conductive hydrogels. NaCl enhanced the conductivity of hydrogels. The hydrogen-bond crosslinking network was formed by adding LPAA into the hydrogel, which enhanced the mechanical properties of the hydrogel (the tensile strength was 96 kPa and the compressive strength was 0.54 MPa). With LPAA added, the adhesion of hydrogels was improved to 11.3 kPa on glass, 14.2 kPa on plastic, and 17.3 kPa on metal. LPAA also provided excellent UV shielding ability (99.95%) for hydrogels while maintaining good transparency. The conductive hydrogels with good sensitivity (Gauge Factor = 2.51, 100%–500%) and stability can be used as strain sensors for monitoring physical activity. It is expected to be a candidate material for future flexible wearable electronic devices.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 46
·e54674
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IF 3
Yingting Yin,Mao Feng,Wei Li,Jinbo Yao,Jiarong Niu
To improve the flame retardancy and solid content of waterborne polyurethane (WPU), AOT, and AOD series of WPU were synthesized and characterized. Carboxylic acid/nonionic composite units were used as hydrophilic groups, and OP550/THPO and OP550/DOPO-HQ combinations were used as flame retardant modifiers, respectively. The results revealed that the flame retardant-modified WPU emulsions still had excellent dispersion, stability, and fluidity. The UL-94 rating of modified WPU could reach V-0, and the AOD series samples had better flame retardancy than the AOT series, where AO 10 D 3 -WPU containing 3% DOPO-HQ had an limiting oxygen index value up to 30.5%. Besides, the peak heat release rate and total heat release of AO 10 D 3 -WPU were respectively decreased by 32% and 34%, compared with the control sample in the conical calorimetric test. The TGA, TG-IR, and SEM-EDS exhibited that the flame retardants functioned in the condensed phase by promoting carbon formation. The tensile strength of AOT series samples was excellent with a range of 15.84–27.47 MPa, while the elongation at break of AOD series samples was relatively high with a distribution of 850.8%–913.11%, which could be selected to suit the needs of different application scenarios.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 46
·e54677
·
IF 3
Zhuofan Qin,Haoyue Wang,Lina Wang,Juming Yao,Guocheng Zhu,Baochun Guo,Jiri Militky,Dana Kremenakova,Ming Zhang
In the face of changing outdoor environments, it is necessary for us to develop advanced textiles with thermal regulation and hydrophobic properties. In order to create a fabric with both temperature control and waterproof properties, the study adjusted the ratio of polystyrene (PS) and polyvinylidene fluoride (PVDF) to produce nanofiber membranes with excellent morphology and dirt resistant properties. Furthermore, the hydrophobicity of the nanofibers was further improved by adding SiO 2 to the spinning solution. Based on this, a core solution of octadecane (Oct) was used to give it thermal regulation functionality through coaxial electrospinning technique. The resulting composite nanofiber membrane exhibited excellent hydrophobicity and thermal regulation performance. The measurement results obtained from Differential Scanning Calorimetry (DSC) indicate that the maximum Oct encapsulation rate of the PS/PVDF/SiO 2 @Oct nanofiber membrane is 58.36%. The latent heat of the composite nanofiber membrane is 148.84 J/g, and the water contact angle (WCA) is 135°. The multifunctional composite nanofiber has great potential for applications in outdoor protective clothing and outdoor electronic device protection.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 44
·e54624
·
IF 3
Shiping Wang,Lushen Shen,Honglin Yang,Guohui Cai,Ganchang Lei,Lijuan Shen,Yingying Zhan,Lilong Jiang
Developing economic controlled-release fertilizers (CRFs) with superior performance is an ongoing and important research area. This work investigated the co-modification of acid-activated attapulgite (ac-AT) to optimize its surface properties for polyurethane (PU) composite applications, specifically in the coatings of CRFs. The modified ac-AT (MAT) rods were obtained through treatment with 2.0 wt.% KH-560 coupling agent and in-situ grafting with stearic acid (SA). Varying the addition amount of SA resulted in the synthesis of different MAT fillers. Along with the adjustment of the filling amount, the properties of the MAT/PU composites were controlled. Notably, applying 1.5 wt.% SA onto the KH-560 treated ac-AT produced MAT with a contact angle of 100.8°, enhancing hydrophobicity and dispersion within the PU matrix. Furthermore, at a filling amount of 9.0 wt.%, the MAT/PU composite exhibited the most favorable properties with a tensile strength of 2.37 MPa, making it the optimal coating for CRFs with 75% nutrient release within 46 days while the coating efficiency was 3.0 wt.%. This co-modification approach shows great potential in enhancing filler properties and promoting their application in organic coatings.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 45
·e54644
·
IF 3
Liang Yi,Longxiadi Zhou,Long Yan,Zhisheng Xu
To enhance the flame retardancy and aging resistance of grouting fireproof glass, different molecular weights of polyethylene glycol (PEG) were mixed with acrylamide (AM) to construct interpenetrating network hydrogels, then the obtained hydrogels were mixed with flame retardants to prepare a series of transparent flame-retarded hydrogels applied in the fireproof glass. The effects of PAM/PEG hydrogel with varying PEG molecular weight on the optical transparency, heat insulation and aging resistance of fireproof glass were investigated. Optical transparency analysis shows that the light transmittance of grouting fireproof glass decreases with the increase of PEG molecular weight in the PAM/PEG interpenetrating network. Fire tests show that PAM/PEG hydrogel significantly enhances the heat insulation and aging resistance of the grouting fireproof glass compared to the single PAM network hydrogel. The flame-retarded and anti-aging effects of PAM/PEG hydrogel in the fireproof glass varies with the PEG molecular weight, and the order is PAM/PEG2000 > PAM/PEG1500 > PAM/PEG1000 > PAM/PEG800. Accelerated aging test shows that PAM/PEG interpenetrating network hydrogel is less affected by aging conditions and exerts durable heat insulation and transmittance. Especially, the backside temperature of 3600 s and transmittance of PAM/PEG2000 system after 264 h aging test only changed 38.3°C and 1.3%, respectively, compared to the unaged PAM/PEG2000 system.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Hudie Fu,Li Kang,Lanjun Yu,Yanping Fu,Zhijie Wen,Shengpeng Zhu,Mohan Zhao,Yuqing Wang,Qi Chen,Qinxiong Lin,Xinzhou Yang,Yan Hu
Hydrogels have been widely used in wound dressings owing to their biocompatibility and bacteriostatic properties. In this study, a chitosan-citric acid gel film was prepared using chitosan as the raw material and citric acid as the acid solvent and cross-linking agent. In addition, to increase the antibacterial effect of the gel film, ketoconazole/β-cyclodextrin inclusion complex was prepared by inclusion technology and added to the gel film to prepare a chitosan-citric acid sustained-release gel film loaded with ketoconazole/β-cyclodextrin inclusion complex for treating cutaneous candidiasis. The physical and chemical properties of the chitosan-citric acid gel films were investigated using infrared spectroscopy, x-ray diffraction, water vapor transmittance test, thermal analysis, and swelling tests. Drug release, antibacterial, and toxicity tests of the chitosan-citric acid gel film loading with ketoconazole/β-cyclodextrin inclusion complex were carried out in vitro. The composite film showed good sustained drug release behavior, antibacterial effects, and biocompatibility in vitro. These results support that the chitosan-citric acid hydrogel has great potential as a gel wound dressing for the treatment of cutaneous candidiasis.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 46
·e54671
·
IF 3
Zonglin He,Zhenhong Huang,Jiahui Chen,Ansheng Chen,Jiaoyan Ai,Lina Song,Baohua Liu
Poly (propylene carbonate) diol (PPCD) is one of the most attractive CO 2 copolymers. PPCD-based polyurethane has excellent mechanical properties and hydrophilicity, and is widely used in various fields. However, poor alkali resistance limits the application of PPCD-based polyurethane in wet-type artificial leather (WPL). In order to solve this problem, polyurethane solution (PUS) for wet-type artificial leather was prepared by using PPCD and polytetramethylene ether glycol (PTMG) as soft segments. The chemical structure, viscosity, molecular weight and distribution, physical and mechanical properties, thermal properties and dynamic mechanical thermal properties of PUS were characterized. The changes of the physical and mechanical properties of PUS films and surface morphology of WPLs after soaking in 10 wt% NaOH solution at room temperature for 24 h were studied, so as to evaluate the alkali resistance of polyurethane. The retention of tensile strength and tearing strength of PUS films modified by PTMG increased from 80% to 96% and from 89% to 100%, respectively. The scanning electron microscopy results showed that appropriate PTMG was beneficial to the formation of microporous structure for CO 2 -based polyurethane leather. The leather without PTMG showed agglomeration phenomenon, the micropores were not obvious, and the changes were obvious after soaking in alkali solution. After being modified by PTMG, the morphology of leather after soaking in alkali solution was basically unchanged. Polyurethane leather prepared with PTMG and PPCD as soft segments has excellent alkali resistance. These results suggest that PPCD could be a potential artificial leather material.
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高影响因子
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