JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 32
·50790
·
IF 3.125
Tengchao Zeng,Guiping He,Xinxiang Li,Chaoxia Wang
A series of reactive branched polyurethane dispersants (BPUs) were successfully synthesized based on epoxy as reactive group and nitrogen-containing heterocycles as anchoring group. The branched polyurethane was adopted an ''A 2 + B 3 '' approach with diisocyanate prepolymer and trimethylolpropane. The structure, molecular weight, and thermodynamic property of BPUs were characterized. The pigment dispersions were prepared with BPUs as the dispersant by ball milling, and then the characteristic parameters such as pigment particle size, viscosity, stability, color properties, and fastness were evaluated. Excellent dispersing performances were observed that the particle size of five dispersions were below 200 nm, with the viscosity as low as 6–9 mPa·s. It is worth noting that the pigment dispersion prepared by BPU exhibited excellent stability and self-adhesive performance. These dispersions were printed on cotton fabrics without adhesives, their water washing fastness was approximately grade 4. And the dry rubbing and wet rubbing fastnesses were 3 and 2–3, respectively.
研究领域:
材料科学
·
纺织工程
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 14
·51895
·
IF 3.125
Weihua Su,Yan Qin,Guihua Meng,Jianning Wu,Shengchao Yang,Lin Cui,Wenjuan Li,Zhiyong Liu,Xuhong Guo
Intelligent response carriers have been developed and widely used in agriculture to improve pesticide utilization. However, there are few tailored response carriers that are targeting the cotton aphid pest. Based on the temperature-dependent growth and reproduction of cotton aphids, we constructed a tailored temperature-responsive star-shaped polymer to achieve on-demand controlled release of imidacloprid (IMI) to more effectively kill cotton aphids. In this work, a series of star-shaped polymers based on β -cyclodextrin ( β -CD), 2-(2-methoxyethoxy)ethyl methacrylate (MEO 2 MA), and tert -butyl acrylate ( t BA) were synthesized via atom transfer radical polymerization (ATRP). Next, β -CD-PMEO 2 MA ( β -CD-P0) micelles were developed having different controlled release rates of IMI at different temperatures (14, 21, or 27°C) following the cotton aphid growth and reproduction cycle. At 21°C, the micelle underwent a phase transition from a solution state to a turbidity state. By inducing this structural change, release of IMI was increased to adapt to the reproduction of the cotton aphid population which is highest at 21–27°C. In vitro release experiments showed that 48% of IMI was released from β -CD-P0 after the phase transition temperature (PTT). An aqueous solution of the β -CD-P0 polymer micelle was stable at 4°C for at least 28 days. Therefore, this intelligent response release model has enormous potential as a novel carrier for various pesticides.
研究领域:
农业科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 11
·49992
·
IF 2.52
Xiaoying Wang,Lili Wang,Bingyan Sun,Xiaomeng Chu,Xuteng Xing,Shaojie Liu,Erjun Tang
In this work, the sulfonated polystyrene brushes were grafted onto magnetic nanoparticles to obtain recoverable catalysts for efficient synthesis of ethyl N-phenylformimidate. First, the surface modification of Fe 3 O 4 with a particle size of about 10 nm was performed with the silane coupling agent of vinyl triethoxysilane (SG-151) to obtain Fe 3 O 4 with carbon–carbon double bonds on the surface (SG-Fe 3 O 4 ). Subsequently, SG-Fe 3 O 4 , styrene (St) and chloromethyl styrene (CMSt) were polymerized to obtain the magnetic chloromethylated polystyrene sphere (SG-Fe 3 O 4 @PS-Cl) with core-shell structure by solution copolymerization. Using St as monomer and SG-Fe 3 O 4 @PS-Cl as macromolecular initiator, the magnetic polystyrene brush of SG-Fe 3 O 4 @PS-PSt was obtained by activated regenerated electron transfer catalyst atom transfer radical polymerization. Finally, SG-Fe 3 O 4 @PS-PSt was sulfonated with sulfuric acid to form a magnetic sulfonated polystyrene brush of SG-Fe 3 O 4 @PS-PSH. SG-Fe 3 O 4 @PS-PSH was used as a recoverable acid catalyst to synthesize ethyl N-phenylformimidate. Due to the high loading of the sulfonic acid group of this catalyst, its added amount was lower than other solid acids such as p-toluenesulfonic acid. The results showed that the catalytic performance of SG-Fe 3 O 4 @PS-PSH was better than p-toluenesulfonic acid and commercial macroporous sulfonic acid resin. The external magnetic field can directly recover SG-Fe 3 O 4 @PS-PSH, simplifying the recovery of catalyst and reducing the catalyst loss. After recycling, the yield of ethyl N-phenylformimidate was not significantly decreased.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52903
·
IF 3.057
Han Wang,Liang Feng,Jun Zeng,Lingmin Chen,An Chen,Maolin Liu,Jingang Xiong
Nanofiber is a kind of high-performance material, which has great applications. Among many preparation methods, centrifugal electrospinning combines the advantages of electrospinning and centrifugal spinning, with high yield and a wide range of application. But its influencing factors are numerous, the process is still immature, and unable to meet the needs of industrialization. Here, we design a set of centrifugal electrospinning equipment and its process, and explore the influence of rotor form on fiber formation. First, the structure and working principle of experimental equipment of centrifugal electrospinning are introduced. Then, the influence of two factors, the rotor shape and rotor material, on space electric field is studied through theoretical and simulation analysis. Finally, based on the designed equipment, the effects of different rotor forms on the fibers preparation of centrifugal electrospinning are studied. The results show that the fiber diameter of centrifugal electrospinning is greatly affected by the form of the rotor. By changing the surface shape of the rotor and the rotor material, the diameter of the fiber can be controlled. Experiments show that the average fiber diameter of the γ-shaped rotor is the smallest, and the fiber spun with ULTEM PEI 1010 material has the best overall performance.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51440
·
IF 3.125
Na Xu,Yanmei Xing,Xuechuan Wang,Longfang Ren,Taotao Qiang
Superfine fiber synthetic leather is a high-grade artificial leather product with numerous characteristics and advantages. However, compared with natural leather, it shows poor moisture absorption and moisture permeability, and it gives people a hot and tacky feeling; thus, the improvement of these properties has become a popular topic in the industry. In this paper, the “click” chemistry method was employed to modify the nylon fiber of the superfine fiber synthetic leather base with waste collagen to improve the moisture absorption and permeability of the superfine fiber synthetic leather base, thus enhancing the hygienic performance and wearing comfort of the end products, realizing waste recycling. This study obtained the optimal reaction conditions for the “click” modification of unfigured sea-island superfine fiber synthetic leather base with collagen methacrylamide. The characterizations by static contact angle measurements, attenuated total reflection infrared spectroscopy, and X-ray photoelectron spectroscopy analysis confirmed that collagen was successfully grafted onto the surface of the nylon fiber. Compared with the original base, the moisture absorption, and permeability of the base were improved by 602.4% and 43%, respectively. This study shows the theoretical research significance and excellent practical value for the resource utilization of skin collagen waste.
研究领域:
材料科学
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生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 4
·51548
·
IF 3.125
Yanling Wang,Longhao Tang,Yongfei Li,Qiang Li
Profound understanding of relationships between molecular networks with properties can make it more convenient for people to prepare and employ shape memory polymers (SMPs). In this paper, a series of epoxy SMPs were developed based on epoxy (E-51), trimethylolpropane tris(3-mercaptopropionate) and pentaerythritoltetrakis (3-mercaptopropionate), and 2-methylimidazole, through “epoxy-thiol” click reaction. The effect of networks on key properties (heat resistance and mechanical properties shape recovery performance) was systematically investigated. Experiment results indicated that there were positive correlations between network regularity with both thermal–mechanical properties and heat resistance. In addition, regularity of network structure had an effect to restrict shape recovery speed.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 11
·47186
·
IF 1.901
Liyuan Sun,Yajie Zhang,Jinggang Wang,Fei Liu,Zhen Jia,Xiaoqing Liu,Jin Zhu
2,5-furandicarboxylic acid (FDCA), a bio-based monomer, was taken as a sustainable alternative to isophthalic acid (IPA) for the modification of poly(ethylene terephthalate) (PET). Results showed that FDCA was more effective than IPA in terms of reducing the crystallization activity of PET, because FDCA is more rigid and highly polar, which will hinder the PET chain packing during crystallization process. Moreover, modification of PET with FDCA resulted in copolyester with higher glass transition temperature, higher tensile modulus, better optical clarity, and gas barrier property, compared to those of IPA. With the addition of 20 mol % FDCA, the resulted copolyester poly(ethylene 2,5-furandicarboxylate- co -ethylene terephthalate) (PEFT 20) was able to keep high transparency even after being annealed at 110 °C for 40 min. However, when 20 mol % of IPA was added, poly(ethylene isophthalate- co -ethylene terephthalate) (PEIT20) easily turned opaque under the same heat treatment. Therefore, less amount of FDCA was required in order to obtain the PET copolyester with better performance. The result indicated that FDCA had great potential to substitute IPA for the modification of PET from the point of view of industrial application. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47186.
研究领域:
材料科学
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可持续化学
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高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 24
·
IF 1.86
Xiaoyan Li,Shawei Tang,Xiaoqin Zhou,Shengheng Gu,Kai Huang,Jianjun Xu,Xia Wang,Ying Li
A functional modified montmorillonite (F-OMMT) was prepared by intercalating pristine montmorillonite using phosphonium salt and subsequent grafting through alkyl amino silane coupling. The synergistic effect of F-OMMT on the flame retardancy and char-forming mechanism of intumescent flame-retarded polystyrene- b -(ethylene- co -butylene)- b -styrene (SEBS) composite (SEBS/IFR) was investigated. When 2 wt % F-OMMT was introduced to the SEBS/IFR composite, the limited oxygen index (LOI) value of the composite increased from 24.9% to 26.9%, and the peak heat release rate significantly reduced according to microscale combustion calorimeter (MCC) test. The outer char demonstrated that F-OMMT produced dense and intact nanoparticles with a stabilised graphite structure. Meanwhile, F-OMMT helped form a crosslinking network containing large amounts of P, O, N, and Si in the char layer. Along with IFR, the amino functional group on the clay released nonflammable ammonia in the gaseous phase, the enhanced blowing effect can overcome the high-viscosity resistance of SEBS, more intumescent coating with strengthened clay platelets was then produced. In addition, the tensile properties of SEBS/IFR/F-OMMT composite increased evidently for the good dispersion effect. F-OMMT can serve as an effective and environmentally friendly additive for SEBS/IFR composite. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44953.
研究领域:
材料科学
·
阻燃材料
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 1
·
IF 1.768
Yue Zhu,Xiang Gao,Yingwu Luo
Poly(methyl methacrylate) (PMMA) block copolymer is interesting because it is compatible with many polymers. A series of poly(methyl methacrylate)- b -poly( n -butyl acrylate) (PMMA- b -PnBA) diblock copolymers with various compositions was synthesized via reversible addition–fragmentation chain-transfer (RAFT) emulsion polymerization with the amphiphilic oligo(methacrylic acid 41 - b -methyl methacrylate 8 ) RAFT agent as both the polymerization mediator and surfactant. The molecular weights of the block copolymers agreed well with the theoretical prediction, although the polydispersity indices were relatively broad. The resulting core [poly( n -butyl acrylate)]–shell (PMMA) particles of PMMA- b -PnBA were found to be very effective impact modifiers for polycarbonate (PC). The diblock copolymer was well dispersed in 100–300-nm particles in the PC matrix, and the dispersed particle size was highly dependent on the block copolymer compositions. PMMA 250 - b -PnBA 550 (the subscripted number signifies the designed degree of polymerization), which was dispersed into 100-nm particles, presented the best capability for improving the impacting properties. Compared with the neat PC, the notched impact strength of PC toughened by 5 wt % PMMA 250 - b -PnBA 550 was increased by four times to 62.81 kJ/m 2 with the same yield strength, a slightly decreased modulus, an increased elongation at break, and an increased tensile strength. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42833.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 137
·期 1
·47411
·
IF 1.901
Zhun Li,Chuanchuan Liu,Weihong Cao,Qiang Yao
To take the advantage of reactivity of five-membered cyclic phosphorus compounds, 1,2,3-tri-phenyl-1,3,2-diazaphospholidine-2-oxide (TPDPO) was explored as a reactive flame retardant for epoxy resins (EPs). Through model compounds, it has been established that TPDPO selectively reacts with the secondary hydroxyl group and is inert toward both aryl amino groups and epoxide groups. The result of Soxhlet extraction supports that TPDPO is permanently bonded to the cured EPs. At a loading of only 8 wt % (0.74 wt % phosphorus), TPDPO enables the cured epoxy to achieve a UL-94 V0 rating. The thermogravimetric analysis–Fourier transform infrared analyses of the gaseous products suggest that the excellent flame retardancy of EP–TPDPO is partly due to the enhanced dehydration process of the epoxy. Also an increased char yield and the formation of a coherent char layer contribute to the good fire performance of EP–TPDPO. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 47411.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 20
·50424
·
IF 2.52
Junfeng Qian,Tingting Wu,Jianqun Shi,Hao Chang,Donghui Liu,Yichang Pan
Membrane-based technology is an attractive alternative in terms of CO 2 separation. Pebax-based membranes are regarded as potential candidates for CO 2 separation due to the favorable interaction between its poly (ethylene oxide) chains with CO 2 molecules and inorganic fillers. However, the separation performance for CO 2 /CH 4 mixture is still suffered from the moderate gas permeability and selectivity. To overcome this problem, in this work, amino-functionalized zeolite imidazolate framework (ZIF-7-NH 2 ) nanocrystals were used as fillers to blend with Pebax 1657 for fabricating mixed-matrix membranes (MMMs). XRD, Brunauer–Emmett–Teller (BET), scanning electron microscope, and 1 H nuclear magnetic resonance characterization indicated that ZIF-7-NH 2 with the highest crystallinity was synthesized. Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), and Young's modulus showed that it has good interfacial interaction. Gas separation test results showed that both the CO 2 permeability and CO 2 /CH 4 selectivity of the 31 wt% ZIF-7-NH 2 /Pebax MMMs increased by 80 and 170%, respectively. The improved performance is attributed to the addition of ZIF-7-NH 2 nanocrystals and the favorable interfacial interactions between the polymer and ZIF-7-NH 2 nanocrystals. Furthermore, the polyvinylidene fluoride supported hollow fiber composite membranes also exhibit the long-term stability for CO 2 /CH 4 separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 4
·45750
·
IF 1.86
Youzhou Zhou,Liuqin Ge,Neng Fan,Lingqing Dai,Meisheng Xia
To explore the application of shell powder (SP) in rubber, a dye-loaded SP (DSP) bio-filler based on SP and Congo red was incorporated into natural rubber (NR). The adsorption experiments demonstrated that the maximum monolayer adsorption capacity of Congo red onto SP was 69.3 mg/g. The effect of aluminate coupling agent and DSP was investigated by evaluating the cure characteristics, mechanical, thermal, and coloring properties of NR/DSP composites. It was suggested that the optimum amount of aluminate coupling agent was 2 wt %, and the best tensile strength (24.80 MPa) of vulcanizates was achieved at the DSP content of 20 phr, while other mechanical properties such as tear strength kept increasing with the addition of DSP. Furthermore, the improved thermal stability and uniform color distribution of the NR composites was obtained. The results indicate that DSP is promising to become a low-cost filler and pigment for rubber materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45750.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）