JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 18
·48646
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IF 2.188
Meng Ma,Lin Xu,Kai Liu,Si Chen,Huiwen He,Yanqin Shi,Xu Wang
Reactive blending is an innovative method for the improvement of compatibility of polymer blend. In this work, poly ( L -lactic acid) and poly (butylene succinate) (PLLA/PBS) blends were prepared by melt blending to ameliorate the toughness of PLLA. Triphenyl phosphite (TPP) was introduced into the PLLA/PBS blends (80/20 by weight) to enhance their compatibility via reactive blending. The effects of TPP on the morphology and properties of PLLA/PBS blends were studied systematically. The increased torque during melt blending demonstrated that the compatibilizer successfully reacted with PLLA and PBS. The mechanical properties of the blends were exceedingly improved only with 0.5 wt% TPP. A reduction tendency of size of the dispersed phase was observed due to the improvement of compatibility. The DSC and DMA results indicate that the T g of PLLA decreased at a slow rate with the increasing content of TPP. This work provided a simple approach for preparing a kind of high toughed PLLA material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48646.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 23
·48783
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IF 2.188
Zhongqi Liu,Yanchun Huang,Shifeng Deng
A novel polyacetylene-terminated silicone (PTS) resins possessing low curing temperature and high heat resistance has been prepared by Grignard reaction using m -diacetylenylbenzene (DEB), 1,3,5-triacetylenylbenzene(TEB), and dichlorosilane as original materials. The reaction of the functional groups was characterized by in situ Fourier transform infrared spectrometer. The experimental results indicated that Si─H and C≡CH bonds are almost exclusively involved in the crosslinking reaction, while ─C≡C─ bonds only partially react. Further, Si─H and C≡CH bonds can participate in the curing reaction at relatively low temperatures, but ─C≡C─ bonds require higher temperature, indicating the higher activity of Si─H and C≡CH bonds than ─C≡C─ bonds. As determined by differential scanning calorimetry, PTS resins have low peak exothermic temperature at 184.5 °C, which is lower than MSP resin (~ 210 °C); in addition, rheological test showed that PTS resins have a very wide processing window from 40 to 163.3 °C, indicating that the PTS resins have excellent processability with a low curing temperature and wide processing window. What is more, TGA results of thermal-cured PTS resins revealed that T d5 (5% weight loss temperature) of PTS-H10 reached the highest of 684.4 °C. Compared with PTS-H0 resin, there is an increase of 124.2 °C and the remarkably increased heat resistance correlated with a higher m -DEB input ratio. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48783.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 23
·48785
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IF 2.188
Huiwen Pang,Shujun Zhao,Liuting Mo,Zhong Wang,Wei Zhang,Anmin Huang,Shifeng Zhang,Jianzhang Li
Mussel-inspired dopamine chemistry is popular among engineers for surface modification on various substrates due to its high efficiency, handy operation process, and strong reactivity. However, the high cost of dopamine does not allow for mass production. In the present study, low-cost dopamine analogues (alkali lignin and tannic acid) were used to fabricate high-reactivity silkworm silk fiber (SF) via a simple dip-coating approach, and were then applied to a soy-based adhesive to enhance its performance. The SF tightly combines with soy protein mainly via a Schiff base reaction between polydopamine or dopamine analogue and the amine or thiol groups of soy protein; this forms a multiple crosslinked system and “reinforced concrete”-like structure, as confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry, and scanning electron microscopy analyses. As expected, the toughness of the soy-based adhesive obviously improved and the highest wet shear strength of the adhesive samples attained 1.50 MPa, which is far greater than relevant interior use requirements. Though dopamine-coated SF could significantly enhance the wet shear strength of the soy-based adhesive by 387.1% compared to the pristine SM adhesive, lignin-coated and tannic acid-coated SFs are more suitable for practical application due to the lower cost of raw materials. The results of this study may represent an effective and low-cost approach to mussel-inspired surface modification chemistry for the mass production of high-performance soy-based adhesives. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48785.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 23
·48782
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IF 2.188
Yunqing He,Xiang Fei,Hui Li
Traditional packaging materials with single function or weak activity cannot meet the requirements of active packaging. In this study, antimicrobial carboxymethyl cellulose (CMC)-based nanocomposites containing montmorillonite (MMT) and ε-poly-( l -lysine) (ε-PL) were prepared by solution casting method. The morphological, optical, mechanical, barrier, thermal, and antimicrobial properties of the resulted ternary nanocomposites were investigated. The surface morphology of the films was dependent on the contents of the ε-PL used. The incorporation of MMT and ε-PL into CMC matrix improved the UV barrier property, tensile strength, hydrophobicity, and water vapor barrier property. When incorporation of 7.5 wt % ε-PL, the tensile strength increased more than threefold and the water vapor permeability decreased by about 35% compared with pure CMC film, the water contact angle reached up to the highest value of 65.38°. The ε-PL incorporated CMC/MMT films exhibited good antimicrobial activities against Gram-positive ( Staphylococus aureus ) and Gram-negative ( Escherichia coli ) bacteria and fungi ( Botrytis cinerea and Rhizopus oligosporus ). Microbial growth inhibition rate of above 90% was obtained when the content of ε-PL got up to 7.5 wt %. In addition, CMC/MMT/ε-PL7.5 wt % film-forming solution having the appropriate properties was used as coating for the strawberries preservation, the shelf life of strawberries was extended for 2 days. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48782.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 23
·48766
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IF 2.188
Lu Yang,Lequan Wang,Yinghong Chen
The selective laser sintering (SLS) is one of the most important 3D-printing technologies. However, the challenges in SLS could be in the limited high material cost and single material performance. Development of high-performance and multifunctional copowders suitable for SLS is of great importance. Here, polyamide 12 (PA12)/boron nitride (BN) thermal conductive copowders suitable for SLS were successfully prepared through solid state shear milling (S 3 M) technology in combination with cryogenic pulverization technology. The particle size, morphology, grafting reaction between PA12 and BN, rheology behavior, and coalescence behavior of the obtained PA12/BN copowders were carefully investigated. The optimal amount of silica flow additive (0.5 wt %) was determined to achieve the good powder flowability. Under the optimum 3D-printing conditions, the fabrication of parts with high BN loading could be achieved. When BN content was at 40 wt %, the flexural strength could reach 10.6 MPa and the thermal conductivity could reach 0.55 W/m·k, 77% higher than that of pure PA12. After treated with phenolic epoxy resin, the tensile strength and flexural strength of the printed parts with 40 wt % BN loading could reach 14.2 and 25.6 MPa, which were 130 and 115% higher than those of the untreated 3D-printed parts, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48766.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 25
·48760
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IF 2.188
Shengxiang Fu,Zhongyuan Cai,Li Liu,Li Yang,Rongrong Jin,Zhiyun Lu,Hua Ai
Fluorescence/magnetic resonance (MR) dual-mode imaging, which combines the excellent single-cell sensitivity of fluorescence imaging and the high spatial resolution of MR imaging, has been applied to different biomedical applications. However, the aggregation-caused quenching characteristic of most fluorescence molecules often put limits in their applications. Herein, a fluorescence/MR dual-mode imaging probe [polyethylene glycol-polyethylenimine-tetraphenylethene (PEG-PEI-TPE)/superparamagnetic iron oxide (SPIO)] with aggregation-induced emission characteristic is prepared by coupling poly(acrylic acid)-coated SPIO with PEG-PEI-TPE. The fluorescence intensity and lifetime of PEG-PEI-TPE/SPIO is higher than PEG-PEI-TPE especially at lower polymer concentrations (≤0.2 mg mL −1 ). Moreover, the fluorescence intensity of PEG-PEI-TPE/SPIO gradually increased along with the decline of the pH from 9.0 to 4.0, which is beneficial for studying intracellular organelles. The T 2 relaxivity of PEG-PEI-TPE/SPIO is 212.3 Fe m M −1 s −1 under a 3.0 T MR scanner. Cell labeling experiment shows that PEG-PEI-TPE/SPIO can effectively label RAW 264.7 and Hela cells, and labeled cells are visible under both fluorescence and clinical MR examinations. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48760.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 22
·48753
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IF 2.188
Ling Song,Haiyang Yang,Duxin Li,Qibin Jiang,Dan Zeng
In order to improve the toughness, wear resistance, and combustion properties of the monomer casting nylon (MC nylon) materials, the polydimethylsiloxane (PDMS) segment is bonded to the nylon molecular chain by copolymerization. PDMS/MC nylon copolymers are prepared via in situ anionic polymerization with macro-activator based on PDMS terminated with hexamethylene diisocyanate. The effects of different macro-activator content on the mechanical properties, water absorption, thermal stability, friction and wear properties, and combustion properties of the copolymers are characterized. The results show that the impact strength of the copolymer improves significantly (optimally increases by 2.6 times) and the water absorption rate decreases with the increase of PDMS content. The introduction of the silicon–oxygen structure reduces the peak heat release rate of copolymer materials (optimally decreases about 28.7%), while it promotes the decomposition of the system, resulting in a slight decrease in the thermal stability of the materials. Adding 5 wt % PDMS can decrease the wear loss of MC nylon from 6.2 mg of pure nylon to 1.6 mg. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48753.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 21
·48734
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IF 2.188
Jinfeng Cui,Yabin Zhang,Lurong Wang,He Liu,Niannian Wang,Baoping Yang,Junhong Guo,Li Tian
Two novel Salen-DPCPs metal complexes (Salen-DPCP-1 and Salen-DPCP-2), containing both Salen-Schiff base (Salen), phenyl phosphate structures (DPCP) and nickel component, were prepared to reduce fire hazards of epoxy resin (EP). The results showed that 5 wt % addition of Salen-DPCP-1 brought a higher flame-retardant efficiency to the EP, where the V-0 rating in UL-94 burning test and 31.5% of limiting oxygen index (LOI) were achieved. Meanwhile, total heat release, total smoke production, and total CO yield dramatically decreased by 28.1, 23.6, and 21.4%. In addition, these results basically reappeared when Salen-DPCP-2 were introduced into EP to obtain Salen-DPCP-2/EP composites. Chemical structure and morphology characterization of the carbon residue confirmed that Salen-DPCPs improved the catalytic charring ability and the noncombustible gas releasing ability by the Fourier transform infrared, X-ray photoelectron spectroscopy, and Scanning electron microscopy technology. Therefore, it is an efficient strategy to develop novel Salen composites modified by flame-retardant groups to improve the fire rating of polymers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48734.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 21
·48723
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IF 2.188
Fangji Gan,Yuyu Xu,Huimin Yang,Zhe Ren,Haiyan Du
Solid-state polymer supercapacitors (SSP-SCs) have vast potential for future development due to their compact, safe, environment-friendly, and facile designing. Thus, prevalent researches have been explored in this area. In this article, poly(3,4-ethylenedioxythiophene) (PEDOT) SSP-SCs were assembled by using poly(3,4-ethylenedioxythiophene)/carbon paper (PEDOT/CP) as electrodes and polyvinyl alcohol/sulfuric acid/potassium iodide (PVA/H 2 SO 4 /KI) as the gel polymer electrolyte. The effect of KI content on the electrochemical performance of the SC was studied by cyclic voltammetry, galvanostatic charge–discharge measurements (GCD), and electrochemical impedance spectroscopy. The results indicated that the PEDOT SSP-SC has excellent electrochemical properties when KI doping amount was 60 wt %. The introduction of KI increased the specific capacitance due to the improved ionic conductivity and additional pseudocapacitance reaction at the electrode–electrolyte interface. The PEDOT SSP-SC showed high energy and power densities of 451.32 Wh kg −1 and 13.29 kW kg −1 , respectively, as well as a specific capacitance of 352.59 F g −1 for a discharge current of 1 mA cm −2 . In addition, after 1000 GCD cycles, the PVA/H 2 SO 4 /KI-based PEDOT SSP-SC showed capacitance retention of 74.08%. Therefore, the SC exhibits outstanding energy and power density and good cycle stability and has great potential to be used in high-energy density equipment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48723.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 20
·48703
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IF 2.188
Chun Zhang,Yongping Bai,Wenwen Liu
4-formyl-phenylboronic acid (FBA) and caffeic acid (CA) can combine to obtain a novel vinyl monomer containing boroxin, which was named as FBCA. Having been reduced the inhibition of phenolic hydroxyl groups, FBCA could directly copolymerize with acrylate (for instance, isobornyl acrylate (IBOA), butyl acrylate (BA), and hydroxypropyl methacrylate (HPMA)) by free-radical polymerization to produce modified acrylate copolymer adhesive (FBCA-IBH). Compared with sole acrylate copolymer adhesive (IBH), the FBCA-IBH adhesive presents a higher thermal stability, cohesive strength, creep resistance, strain recovery, and adhesion strength to different substrate (such as carbon steel, polypropylene (PP), and polytetrafluoroethylene (PTFE)). According to the results of TGA, the initial degradation temperature of FBCA-IBH is increased by 50 °C. The creep resistance of FBCA-IBH is improved and its holding power to carbon steel is increased from 19 min to 3 h. It is eye catching that the shear strength to carbon steel could reach 9.37 MPa. Besides, this shear strength can be maintained even if after 18 cycle times, even the maximum value can achieve 14.36 MPa. The adhesion of thermoplastic adhesives to carbon steel exhibits adhesion strength comparable to that of thermoset adhesives. The reversible adhesive presents bonding strength in macro-field, not just limited in micro-field. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137 , 48703.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 19
·48667
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IF 2.188
Rui Wang,Yanyu Zheng,Lihao Chen,Shaoyun Chen,Dongxian Zhuo,Lixin Wu
Using conventional mixing techniques, the mechanical properties of prepared carbon nanotube (CNT)/polymer composites are not impressive enough, because of their aggregation problem at a high loading of CNTs. In this article, high mechanical performance ultrahigh molecular weight polyethylene (UHMWPE) nanocomposites with high loading of multiwalled CNTs were successfully fabricated by a new manufacturing technique. Specifically, the tensile strength and storage modulus at 25 °C of UHMWPE nanocomposites with 32 wt % of nanotubes prepared by the novel technique reaches 107.6 MPa and 6.0 GPa, respectively, about 4.7 times and 5.0 times of that of pure UHMWPE resin, which are also very high experimental results compared with polyethylene nanocomposite prepared by traditional hot-compression techniques. These attractive results suggest that the high-loading CNTs without sacrificing their dispersion and the impregnation quality of polymer-impregnated buckypapers are essential for fabricating CNTs/polymer composites with superior mechanical properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137 , 48667.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 17
·48598
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IF 2.188
Yuhao Qi,Guangda Zhu,Junping Zheng
In this paper, a series of graphitic carbon nitride (g-C 3 N 4 ) was synthesized under different thermal oxidation etching temperatures and epoxy/g-C 3 N 4 composites were prepared via solution blending. The morphology and structure of g-C 3 N 4 were investigated by transmission electron microscope, X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The tensile fracture morphology and structure of epoxy resin (EP) composites were demonstrated by scanning electron microscopy and XRD, respectively. Mechanical properties of EP composites were characterized by tensile testing, and the thermal performances were investigated by dynamic mechanical thermal analysis and thermal gravimetric analysis. The results revealed that the active groups on g-C 3 N 4 sheets increased under thermal oxidation etching and the C to N ratio of g-C 3 N 4 decreased from 0.94 to 0.76 with the increasing etching temperature. Noticeably, the tensile strength of EP composites was enhanced by 58% with the addition of C 3 N 4 -NS-500 and the thermal properties were also improved significantly, including T 0.5 (the decomposition temperature at the mass loss of 50%) increased by 21.5 °C and glass transition temperature improved by 8 °C. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48598.
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高影响因子
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