JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53805
·
IF 3
Dezhong Xu,Ao Li,Weijie Lin,Qiuxia Zou,Shuai Wu,Ajoy Kanti Mondal,Wangchuan Xiao,Fang Huang
In this study, pH and thermally responsive P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) was prepared by atom transfer radical polymerization (ATRP) using perfluoropolyether hydroxyethyl methacrylate (PFPHM) as hydrophobic core, 2-(Dimethylamino) ethyl methacrylate as pH and thermal response function segment, and poly (ethylene glycol) methyl ether acrylate 480 as hydrophilic shell, respectively. The chemical structure, critical micelle concentration (CMC), lower critical solution temperature (LCST), biological toxicity, stability of micelles, drug-loading performance and cumulative drug release rate of prepared P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) were analyzed by 19 F NMR, 1 H NMR, FTIR, DLS, UV–Vis, laser confocal microscopy and fluorescence spectrophotometer. The results show that P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) exhibites a CMC of 7.5 g/L, LCST of 37.6°C and excellent micelle stability. Moreover, the analysis of drug-loading indicates that the polymer displayed drug loading efficiency (DL) is 21.3% and the encapsulation efficiency (EE) is 90.0%. Its cumulative drug release rates at pH = 6.5 (42°C) is almost double of those at pH = 7.4 (42°C), pH = 6.5 (37°C) and pH = 7.4 (37°C). These results suggeste that the P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) at pH ranging from 6.5 to 7.4 and temperature ranging from 37 to 42°C are pH and temperature sensitive. It has great potential application as a drug loading for DOX.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 19
·e53836
·
IF 3
Jinlin Chen,Xiaodong Wen,Fang Xu,Shuangfei Xiang,Shujun Zhao,Feiya Fu,Xiangdong Liu,Ni Li
This study aims at developing novel methodology to prepare antibacterial cotton fabric with excellent antibacterial durability, and a “grafting through” approach was adopted to enhance affinity of Ag NPs with cotton fiber surfaces. The surface modification was carried out by covalently linking acrylic acid (AA) molecules onto the fibers, then 4-vinylpyridine was copolymerized with the AA moieties as a polymeric binder. Once the coordination bonds were formed between silver nanoparticles (Ag NPs) and the pyridine nitrogen, Ag NPs could be stably immobilized on the cotton fabric. Experimental results showed that the AA-co-PVP grafting copolymer had a significant regulatory effect on the dispersion and particle size of Ag particles, and the resulting cotton fabric presented a high antibacterial property with excellent durability. Even after 120 washing cycles, the bacterial reduction rates of the modified fabric against both Staphylococcus aureus and Escherichia coli retained a level higher than 99%. In addition, other textile attributes, such as vapor transmissibility, water absorbability and flexibility, could be largely retained in the modified fabrics.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 19
·e53829
·
IF 3
Xin Kang Li,Jun Wei Shen,Hai Lan Lin,Zhao Xin Zhang,Xun Tao Zhang,Jun Bian,Dai Qiang Chen
In order to explore effective strategies to fabricate main-chain polybenzoxazine (PBZ) thermosetting resin for structural material applications, here, five PBZ with different molecular structures, that is, poly(Co-ddm), poly(Co-BPA-ddm-Co) main , poly(Ph-BPA-ddm-Co) main , poly(Ph-BPA-ddm-Ph) main and poly(Ph-ddm) were designed, synthesized and compared by introducing unsaturated fatty chains through the Mannich reaction with cardanol. The structure and properties of five PBZ with different structure were systematically investigated by using Fourier transform infrared (FTIR), NMR, water absorption and mechanical tests. FTIR and NMR tests indicated that five PBZ with different molecular structures were successfully synthesized. The mechanical tests indicated that the impact strength of the double-capped cardanol-based main-chain PBZ was 243% higher than that of the traditional PBZ. The water absorption of main-chain PBZ was higher than that of diamine PBZ, and the water absorption of poly(Ph-BPA-ddm-Co) main was the lowest in the main-chain PBZ. Based on the experimental results, five PBZ amorphous cells with different structures were successfully established. It indicated that the main chain PBZ showed better thermomechanical properties than the traditional diamine PBZ due to high crosslinking conversion and hydrogen bond density. Moreover, the modulus and glass transition temperature of the main chain structure containing unsaturated fatty chains did not decrease significantly.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 19
·e53838
·
IF 3
Xuhui Zhang,Guangyao Ji,Jianing Yang,Jie Jiang,Jianzhong He,Ting Li,Jing Huang,Mingqing Chen,Weifu Dong
Strong, tough, and biodegradable polymers from renewable raw materials are of great importance in circumventing environmental issues. Poly(propylene carbonate) (PPC), a biodegradable carbon dioxide (CO 2 )/propylene oxide copolymer, has been simultaneously strengthened and toughened by incorporating a hybrid natural filler (CNF@xyl). The CNF@xyl is formed by coating cellulose nanofibril (CNF) with small xylitol (xyl) particles using evaporation-induced self-assembly. In CNF@xyl, the xyl cladding around CNF can improve the dispersion of CNF in PPC by inhibiting the contact among CNF, and can enhance the interfacial interaction by providing high-density hydrogen bonds. Meanwhile, the CNF can minimize the size of xyl particles by being a substrate for xyl spreading. Consequently, by incorporating the hybrid fillers at small fraction, PPC/(CNF0.4@xyl2.0) exhibits a Young's modulus of 1318 ± 65 MPa, a tensile strength of 19.07 ± 0.98 MPa, and a toughness of 77.64 ± 3.21 MJ/m 3 , which is 161%, 145%, and 130% of that of neat PPC, respectively. More importantly, CNF, xyl, and PPC are fully biodegradable while CNF and xyl are renewable. This work offers a novel yet green method for optimizing the mechanical properties of biodegradable polymers and provides an alternative way to circumvent environmental issues.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 17
·e53762
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IF 3
Guiying Tian,Huiqing Wang,Yuanyuan Song,Jun Xiang,Yiran Ying,Xurui Han,Songbo Wang,Lei Zhang,Jianping Zhang,Na Tang
Lactide is the crucial intermediate for polylactic acid (PLA) synthesis via ring-open polymerization, but it suffers low yield and low purity induced by racemization reaction. In this work, we have developed a zinc oxide-creatinine (ZnO-CR) hybrid catalyst, which offers high yield (the distilled lactide yield and pure l -lactide yield are 95.73% and 61.64%) and high purity (81.53%) for green l -lactide synthesis at the cyclization temperature of 240°C. Furthermore, NMR and HPLC results show that CR addition significantly restrains the racemization by reducing α-proton abstraction, where guanidine derived from the CR plays a main catalytic role to provide a tight association with the carbonyl oxygen in the carboxyl of L n A oligomers. Therefore, carbonyl-carbon with the enhanced electrophilicity is easier being attacked by a hydroxyl terminal of L n A oligomers, leading to high yield and high purity for lactide synthesis.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 20
·e53852
·
IF 3
Huanyang Yu,Li Zhao,Liyan Wang
Hydrogels have displayed great potential applications in biological intelligent devices, tissue engineering and electronic wearable fields. As the two most important factors limiting the application of hydrogels, strength and self-healing ability have always been the focus of research, but the incompatibility between them has not been resolved. It is worth noting that double-network structure and the introduction of reversible bonds show great promise as a feasible scheme to solve the above problems. Herein, the PVA/G/B double-network hydrogels were developed by a simple synthesis process and exhibited excellent properties, including strong tensile strength (~787 kPa), high elongation at break (~200%), excellent self-healing properties (healing efficiency exceeds 93%), good dimensional stability and transparency. This study provides an effective method for designing hydrogels with high strength, stretchability, stability, transparency and excellent self-healing properties based on the gelatin reinforcing strategy.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 21
·e53874
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IF 3
Yuanzhi Qu,Xinyu Zhou,Han Ren,YueHui Yuan,Wenchao Zhang,Gang Yang,Xianfa Zhang
During drilling in deep formations, it is challenging to form an effective plug to avoid borehole collapse under high temperatures and pressures. In order to simultaneously improve the high-temperature resistance and interparticle interaction capability of traditional plugging agents, a new gel plugging agent (PCAA) with self-healing capability was developed using chitosan, acrylamide, and acrylic acid. The rheological properties of the PCAA indicate that all monomers of PCAA are essential components to improve the performance of the plugging agent. Each monomer has a unique capability, such as acrylamide playing a dominant role in the construction of the gel network, acrylic acid enhancing the gel structure, and chitosan improving the gel adhesion. PCAA can be stretched to 8.8 times prolonged, and its tensile stresses and self-healing rate in 16 h are 17.2 kPa and 78.5%, respectively. Under the extreme conditions of 180°C and 8% NaCl, PCAA still performs well in preventing drilling fluid from invading the sand layer due to its self-healing and plugging effects. In addition, the interaction of PCAA and clay improves the stability, rheological properties, and filtration reduction of drilling fluids at high temperatures. The developed PCAA has been successfully applied to the field with extreme conditions, providing insights into plugging agent design.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 19
·e53839
·
IF 3
Zhengwei Wan,Meili Li,Yaozhong Zhuang,Zaizai Tong
Poly( L -lactic acid) (PLLA) is a biodegradable polymer that has attracted increasing attention due to its fantastic properties. Nevertheless, the disadvantages of PLLA, such as low crystallization rate and brittleness, limit its wide commercial applications. In the present work, electrospun stereocomplex PLA fibers (Sc-fibers) and PLLA grafted cellulose nanocrystals (g-CNCs) are prepared as nano-fillers and then blended with PLLA matrix to prepare different nanocomposites. Both of nano-fillers would accelerate the crystallization rate of PLLA, and as expected, g-CNCs have much stronger nucleation ability towards PLLA than Sc-fibers. Nevertheless, the crystallization of PLLA will decrease to some extent in the presence of both nano-fillers of g-CNCs and Sc-fibers due to the preferential formation of stereocomplex crystals on the surfaces of CNCs. Moreover, the presence of nano-fillers would enhance the mechanical properties of PLLA, such as the elongation at break can increase by four times after incorporating both g-CNCs and Sc-fibers. This work provides a new consideration for designing different nano-fillers, especially for polymer matrices with low crystallization ability and brittleness.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53801
·
IF 3
Yulai Zhao,Lianzhi Shen,Yu Yuan,Longqiang Xiao,Jingyu Cai,Zhen Lu,Linxi Hou
Developing low-cost and highly efficient hydrophobic absorbents via simple and environmentally friendly method is demanded for oil-water separation. This paper reports the preparation of hydrophobic absorbents of porous poly(4-tert-butylstyrene- co -divinylbenzene) (poly( t BS- co -DVB)) via high internal phase emulsion (HIPE) template method. The effects of crosslinking degree and internal phase volume fraction on the porous structure and adsorption performance of the absorbents are investigated. As the t BS/DVB molar ratio increases from 1:1 to 4:1, the adsorption performance of poly( t BS- co -DVB) toward hexane first increases to a maximum at a molar ratio of 3:1 and then decreases. As the internal phase volume fraction increases, the specific surface area (SSA) and porosity of the poly( t BS- co -DVB)s notably increase from 33.06 m 2 /g and 84.07% to 102.89 m 2 /g and 92.94%, respectively. When the internal phase fraction is 95 vol%, the obtained poly( t BS- co -DVB) foam with a water contact angle of 140° shows an absorbing capacity as high as 70.21 g/g for dichloromethane. After 10 consecutive adsorption-desorption cycles, the adsorption performance of the poly( t BS- co -DVB) foam shows only a slight decrease, indicating an excellent recycling ability. The obtained poly( t BS- co -DVB) foams exhibit the advantages of facile preparation, high oil absorption capacity and satisfactory recoverability, which enable them potential as sustainable oil adsorbents.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53802
·
IF 3
Xiaoyu Meng,Qiwang Peng,Jihong Wen,Kai Song,Luman Peng,Tianyu Wu,Chuanbo Cong,Haimu Ye,Qiong Zhou
In vanadium redox flow battery (VRFB). Sulfonated poly(ether ether ketone) (SPEEK) is viewed as a promising alternative to Nafion as a material for vanadium liquid flow battery membrane, due to its low cost and high proton conductivity. However, SPEEK membranes have a Trade-Off effect of proton conduction and ion selectivity, which limits the performance of VRFB. Here, we exploited the Donnan effect of imidazole cations in ionic liquids (ILs) to improve the ion selectivity of SPEEK membrane. In addition, used porous covalent organic framework materials (COF) with sulfonic acid functional groups to immobilize ionic liquids, which reduced the loss of ILs. The ion selectivity of the SPEEK membrane was further improved. As a result, the cell performance of the composite membrane is improved. At a constant current density of 40 mA cm −2 , SPEEK/IL-5@TpPa-SO 3 H-3 membrane exhibits high coulombic efficiencies (CE: 98.43%) and energy efficiencies (EE: 91.7%). Furthermore, the energy efficiency of the SPEEK/IL-5@TpPa-SO 3 H-3 membrane decreases only 2.1% after 60 charge/discharge cycles at 100 mA cm −2 . Our work proposed a cost-effective, high-performance membrane for VRFB.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 17
·e53788
·
IF 3
Lei Jiang,Chengkun Wu,Lu Yao,Qiuxia Dong,Guohua Wu
Regenerated silk fibroin (RSF) fibers have great application prospects in medicine, textiles, optoelectronics, and other fields. However, under the synergistic action of ultraviolet, oxygen, and water, RSF will inevitably become brittle, which will greatly shorten the service life of RSF. Therefore, it is urgent to find some methods to protect RSF from aging damage. Cerium dioxide nanoparticles have a strong ultraviolet absorption and antioxidant capacity and have been used as an anti-aging component for other biomaterials. Thus, the RSF/CeO 2 NPs hybrid fibers were successfully prepared, and a series of artificial aging tests were carried out. Mechanical property is an important index to measure the aging degree. After aging, compared with RSF, the stress of RSF/CeO 2 NPs hybrid fibers was increased by 130.47 ± 4.78 MPa, and the strain of RSF/CeO 2 NPs hybrid fibers was increased by 69.89% ± 1.37%. The results of Fourier transform infrared spectroscopy, UV–Vis, sodium dodecyl sulfate polyacrylamide gel electrophoresis discussed the protective mechanism of CeO 2 NPs, which prevent the transition from β-sheet to α-helix/random coil and the disorder of structure. Furthermore, RSF/CeO 2 NPs hybrid fibers have an excellent antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria; the antioxidant activity of RSF/CeO 2 NPs hybrid fibers is gradually enhanced in the presence of UV-light.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53797
·
IF 3
Jin Qu,Xinru Ma,Guohao Miao,Yu Yang,Junping Zheng,Xiaofei Liu
Polyacrylamide nanospheres are widely used as recovery-enhancing polymers in low-permeability oil fields. However, with the further exploitation of oil fields in recent years, the performance of the regulating drive system has been put forward to higher requirements, so this study of the structure and oil displacement performance of the oil-based supramolecular system based on polyacrylamide, and further discusses its oil displacement mechanism. The results show that the viscosity value of the oil-based supramolecular system increases significantly, which can effectively improve the mobility ratio and improve swept volume. The ability of the system to remove crude oil from the slides is significantly increased, and the mathematical relationships are discussed. The oil displacement efficiency of the oil-based supramolecular system in different dispersion media was explored in combination with microchannels of a nonhomogeneous multistage bifurcation structure. This work supports the practical application of oil-based supramolecular nanospheres in oil fields.
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高影响因子
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