JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 41
·45405
·
IF 1.86
Weijie Li,Jian Hao,Pucha Zhou,Yaodong Liu,Chunxiang Lu,Zhengfang Zhang
In this study, we systematically explored the dependence of the homogeneity and sol–gel transition temperatures of various polyacrylonitrile (PAN) solutions on the solvent solubility parameters. The Cole–Cole slope was used to characterize the solution homogeneity, and we found that the PAN/dimethyl sulfoxide (DMSO) solution, which had a smaller Hansen solubility parameter distance between the solvent and PAN, showed better solution homogeneity than the PAN/dimethylformamide and PAN/dimethylacetamide solutions. Additionally, we found that both heating and cooling were able to cause the gelation of the PAN solution, although their mechanisms were totally different. The gelation caused by heating was ascribed to the nitrile–nitrile coupling of PAN chains, whereas the gelation caused by cooling was due to the solvent bridge effect. In this case, DMSO, which had the highest polarity and the strongest interactions with nitrile groups, caused the highest gelation temperature of the PAN solution during cooling. The gelation temperature of the PAN solution exhibits dependence on its solvent polarity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45405.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 125
·期 4
·3092-3099
·
IF 1.289
Suwen Ye,Licheng Tan,Yiwang Chen,Junchao Wei,Weihua Zhou
A series of aliphatic biodegradable poly(butylene succinate)- co -oligo( L -valine) (PBSVAL) copolyesters were synthesized with dimethyl succinate, 1,4-butanediol (BDO), and oligo( L -valine) (OVL) as reagents. The GPC results show that the weight average molecular weight ( M w ) of the copolyester with a feed ratio (PBS/OVL) of 0.9/0.1 (PBSVAL 10 ) is 4.9 × 10 4 g/mol, and its polydispersity index is 1.68. All the copolyesters were more thermally stable than the pristine poly(butylene succinate) (PBS). The incorporation of valine units into the copolyesters eventually led to the decrease of the crystallization temperature, melting temperature, while increase of crystallization enthalpy and melting enthalpy. The crystal structure of the copolyesters is similar to pure PBS except for higher degrees of crystallinity; also there was a trend to higher degrees of crystallinity with increasing content of valine. From the enzymatic degradation experiment, it is clear that the PBSVAL 10 copolyester shows less weight loss as compared to pure PBS which is due to PBSVAL 10 with higher degree of crystallinity. The morphology of the copolyester films after degradation was also studied by the scanning electron microscopy. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 48
·45510
·
IF 1.86
Chunmiao Xia,Yingwu Luo
Bitumen emulsions have often been modified by styrene–butadiene rubber latex. The modified bitumen can have excellent low-temperature cracking resistance, but rutting resistance at high temperature still remains poor. In the current work, for the first time, a stable poly(styrene- b -isoprene- b -styrene) (SIS) triblock copolymer latex is synthesized by reversible addition–fragmentation transfer (RAFT) emulsion polymerization. Based on this, a simple heterocoagulation process is developed to prepare the bitumen emulsions modified by SIS. The heterocoagulation results in hybrid particles of SIS shell and bitumen core. With addition of 5 wt % SIS, a continuous polymer-rich phase could be formed in the modified bitumen once the modified emulsion was broken down. The bitumen modified by 5 wt % SIS shows a significant increase in complex modulus at high temperature and a significant decrease in loss tangent, suggesting excellent resistance to rutting at high temperature, which is consistent with the significant increase in softening point from 41 °C for the base bitumen up to 64 °C. Meanwhile, the ductility at 5 °C of the modified bitumen is also dramatically increased from 1.4 cm for the base bitumen to 40 cm, indicating the low-temperature cracking resistance should also be much enhanced. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45510.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Han Gong,Xiangchi Liu,Baijun Liu,Mingyao Zhang
Heavy metal and dye pollution are significant environmental challenges that seriously threaten human health and ecosystem balance. This study introduces a new method for recovering Ag + from wastewater and uses the recovered silver for secondary catalytic applications in dye degradation. Polydopamine functionalized polystyrene mesoporous microspheres (PPS-PDA) were prepared using a green mussel chemical method based on monodisperse polystyrene mesoporous microspheres (PPS) with a diameter of approximately 7 μm. According to the results of Brunauer Emmett Teller Analyzer, the average pore size of PPS-PDA is 17.88 nm, the porosity is 0.53%, and the specific surface area is 54.52 m 2 /g. By observing the scanning electron microscope and energy dispersive spectroscopy, PPS-PDA has an adsorption effect on Ag + in silver ammonia solution and can adsorb up to 40% of silver ammonia solution. The catalytic process was monitored by UV–visible light. The adsorbed Ag-supported polydopamine functionalized polystyrene mesoporous microspheres (PPS-PDA-Ag) showed strong catalytic activity in the process of methylene blue reduction, and the catalytic behavior was consistent with the pseudo-second-order kinetic model. The catalyst maintained an efficiency of 85% in 10 cycles, highlighting its potential in sustainable wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Shengdong Liu,Da Li,Tianhua Xiao,Zhufeng Yuan,Huanhuan Zhang,Yonggang Min
Polyetheretherketone (PEEK) emerges as a highly promising biopolymer due to its mechanical properties and elastic modulus akin to those of human cortical bone. Despite these advantages, the clinical utilization of PEEK is often hindered by its limited bioactivity and suboptimal capability for bone integration. Herein, we introduce a facile and expeditious method for enhancing the osseointegration efficacy of PEEK substrates by depositing polydopamine (PDA) chelated with magnesium ions at varying concentrations (0.02, 0.1, and 0.5 M) as a surface coating (PDA-Mg). This PDA-Mg-modified PEEK surface exhibits distinctive properties, including antibacterial properties (antibacterial rate of 93.267%), improved vascular regeneration, and osteogenic promotion (ALP activity increased by 239.5%). Moreover, the Mg 2+ ions are released in a regulated way, and the impact of Mg 2+ concentration on the aforementioned properties has been thoroughly examined. Our study demonstrates that PDA-Mg-modified PEEK offers a highly promising prospect for clinical applications. Specifically, these implants stand out as exceptional candidates for bone graft materials, with the potential to significantly improve patient outcomes and accelerate recovery processes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhendong Liu,Tengfei Sun,Gongrang Li,Hai Xu,Jianren Lv
This study focuses on the preparation and characterization of high glass transition temperature shape memory polymers (HTSMP) for leak plugging applications. The HTSMP was synthesized through a curing reaction and characterized using FTIR spectroscopy, which confirmed the occurrence of a ring-opening reaction resulting in the formation of hydroxyl groups. The glass transition temperature of HTSMP reached up to 136°C, and it maintained a modulus of over 10 MPa at 200°C. Shape memory performance tests showed that HTSMP samples exhibited a recovery rate ranging from 80% to 95%, with a higher recovery rate observed with increased curing agent content. In sealing performance tests, the addition of HTSMP-1 significantly improved the plugging effect of conventional plugging agents, with a pressure-bearing capacity of up to 9.28 MPa at elevated temperatures. These results demonstrate the potential of HTSMP in sealing applications, particularly for addressing fractured leakage in high-temperature deep wells.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
Two-dimensional molybdenum disulfide (MoS 2 ) nanosheets are promising nanofillers for improving the properties of polymers, but low-cost, facile and green methods need to be further explored to meet the requirements for large-scale production of modified MoS 2 nanosheets. Here, we developed a new idea that is, to prepare MoS 2 @Ag by modifying the surface of MoS 2 using radiative reduction. It is noteworthy that the modified MoS 2 @Ag can effectively improve the mechanical strength of ethylene-vinyl acetate (EVA) composites. In addition, the addition of MoS 2 @Ag was able to substantially improve the flame-retardant properties of EVA, resulting in a significant reduction in the amount of heat and smoke released from its combustion. When two parts of MoS 2 @Ag were added, the peak heat release rate and total smoke release of EVA/2.0MoS 2 @Ag composites were reduced by 29.7% and 39.2%, respectively, compared with that of pure EVA. At the same time, the toxic gases (e.g., CO) produced by the combustion of EVA composites were significantly reduced, which indicates an improvement in their fire safety.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Xinyue Pan,Feiyun Li,Peng Yuan,Yanjun Tang
Enzymatic strengthening and cellulase recovery are effective ways for improving the economy of lignocellulosic hydrolysis. A series of temperature-responsive quaternary ammonium salt type enzymatic hydrolysis promoters (PSDM) were obtained by aqueous-solution free radical polymerization. PSDM dissolved under lignocellulosic enzymatic hydrolysis conditions (50°C). After hydrolysis, it co-precipitated with cellulase when cooling. PSDM had significantly improved hydrolysis and recycling enzyme properties. The efficiency of high-solid substrate enzymatic hydrolysis of corncob residues improved to 1.2 times, and 50% of the cellulase amount was saved when adding 1.5 g/L of PSDM 1 to the system. Hydrophobic binding may be the main driving force for co-precipitation between PSDM and cellulase. In this work, regulation of glucose yield and cellulase consumption were realized by adjusting the ratio of positive and negative charges in PSDM. This work provides a new idea for reducing the cost of technology for this lignocellulosic sugar platform.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
In this research, iron tetroxide (Fe₃O₄) nanoparticles were in situ synthesized on the surface of molybdenum disulfide (MoS 2 ) via a radiation technique to fabricate a MoS₂@Fe₃O₄ hybrid. Notably, the tensile strength and elongation at break of ethylene vinyl acetate (EVA)/magnesium hydroxide (MH) composites were enhanced by 62.5% and 59.1%, respectively, with the addition of one part of the MoS₂@Fe₃O₄ hybrid, attributed to its excellent reinforcing effect. Simultaneously, the peak heat release rate (pHRR) and total heat release of the EVA/MH composite decreased by 45.9% and 14.4%, respectively, while the residue content increased to 43.4%. Furthermore, EVA/MH/MoS₂@Fe₃O₄ composites with one part of the MoS₂@Fe₃O₄ hybrid generated significantly fewer toxic gases (such as CO) compared to EVA/MH composites, demonstrating enhanced fire safety. This study underscores the potential of creating noble metal-free layered composites by integrating cost-effective and eco-friendly Fe₃O₄ co-catalysts, such as MoS₂@Fe₃O₄ hybrids, to improve the fire safety of EVA composites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 24
·e55502
·
IF 2.7
Haiwen Tang,Yi Li,Ziyi Zhu,Yingqing Zhan,Ying Li,Kui Li,Pan Wang,Fei Zhong,Wei Feng,Xulin Yang
Previous studies on epoxy foams were subjected to the specific property, and improvements in thermal insulation or dielectric property were usually accompanied by the sacrifice of mechanical strength or thermal stability. The current research reported a high-performance epoxy foam by the pre-curing process using E-51/DDS and expandable microsphere (EMP) as polymer matrix and physical blowing agent, respectively. The effect of EMP loading on the structure & property of epoxy foam was reported. The mean diameter of E-51/EMP foam was in the range of 19–21 μm. The compression property of E-51/EMP foam was fit for the power-law model and its integrity was well maintained during compressive test. Compared with bulky epoxy, a significant decrease of thermal conductivity of 62.93% was observed in 10 wt% EMP-filled epoxy foam. E-51/EMP foam showed superior thermal stabilities, with a T 5% of over 300°C. The dielectric constant was decreased by 54.5% from 4.92 in bulky epoxy to 2.24 in E-51/EMP foam (10 wt% EMP). Notably, there was a percolation phenomenon of EMP (6 wt%) regarding on the structure & property of E-51/EMP foam. This study provides lightweight, robust, high-temperature-resistant, and low-dielectric-constant epoxy foams with the wide application prospects in buoyant, electronic packaging, and energy-saving industries.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yi-Kun Wang,Ya-Jun Chen,Yao Pan,Yu Hai-Yin
Traditional biosensors have drawbacks such as temperature sensitivity and cross-reactivity. An innovative UA biosensor was developed. It combined Prussian Blue, carbon nanotubes, PVP with uricase oxidase in a polysulfone hollow fiber gradient membrane, forming a multilayer 3D structure. The optimal pH and temperature for the biosensor were determined to be 8.0 and 37°C, respectively. Electrochemical impedance spectroscopy (EIS) showed that the nanoparticles significantly reduced the working electrode's impedance, enhancing electron transfer. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study the electrochemical behavior of UA oxidation. A distinct oxidation peak for UA was observed at 0.7 V. The sensor exhibited a sensitivity of 0.33 × 10 −6 A/mM, a linear working range from 1.2 to 12 mM, and a detection limit of 0.424 mM. The porous structure of the membrane and the nanoparticles' synergistic effect contributed to high sensor stability. After continuous use for a week, the sensor maintained approximately 90% of its initial performance. This research demonstrates the effectiveness of our method in developing highly sensitive and stable biosensors for UA detection, providing a promising solution for accurate and reliable uric acid level monitoring.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55917
·
IF 2.7
Xingshan Yin,Zhiyi Huang,Xiaochun Liu,Yingjuan Sun,Xiaofeng Lin,Wenjing Lin,Guobin Yi
It remains enormous challenges to balance the conflict between high strength and toughness mechanical properties and excellent room-temperature self-healing abilities of polyurethane elastomers. In this work, we report a recyclable room-temperature self-healing polyurethane elastomer with excellent mechanical properties. The prepared polyurethane elastomer (PU-DA-Zn 0.50 ) exhibits high tensile strength of 15.33 MPa, high toughness of 76.77 MJ m −3 , and high elongation at break of 1604.46% by introducing isophorone diamine (IPDA), 1-(3-aminopropyl) imidazole (IMZ) and zinc ions into polymer system to form a dynamic double-cross-linked structure (hydrogen bonds and Zn 2+ -imidazole coordination bonds). In addition, the tensile strength of fractured polyurethane can reach more than 80% of the original sample after 48 h of self-healing at room temperature without external stimuli, which is attributed to the kinetics of rapid exchange of Zn 2+ -imidazole coordination bonds at room temperature. It is worth noting that the balance between excellent mechanical properties and outstanding room-temperature self-healing ability can be optimized by adjusting the Zn 2+ -imidazole coordination bond density in the system. Moreover, the dynamic nature of the double-cross-linking network endows polyurethane with favorable recyclability. The above remarkable comprehensive performances reveal a great potential of PU-DA-Zn x elastomer in the fields of wearable flexible electronic devices such as bionic skin, human motion monitoring, and soft robots.
✓ 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）