JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 39
·49158
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IF 2.52
Yanyang Han,Haimei Wang,Xiuling Jiao,Dairong Chen
Poly(vinyl alcohol) (PVA) networks cross-linked by inorganic nanofillers-boehmite (AlOOH) nanowires via strong hydrogen bonding was prepared by a facile strategy. These PVA-AlOOH composites displayed significantly enhanced mechanical and thermal properties due to the excellent mechanical property and high heat resistant of AlOOH nanowires, as well as the strong hydrogen bonding formed between PVA and AlOOH. Interestingly, it was worth mentioning that the PVA-AlOOH composites exhibited excellent shape memory behavior. The strong hydrogen bonding between PVA matrix and AlOOH nanowires acted as the hard segments to maintain the permanent shape, while the weak one between PVA chains served as switching segments to fix the temporary shape and recover to the permanent shape. This physical cross-linked system provided a simple and efficient strategy to obtain smart shape memory materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48980
·
IF 2.52
Jian Zhao,Tao Xing,Qin Li,Yu Chen,Weishang Yao,Shaohua Jin,Shusen Chen
The excellent properties of the polyelectrolyte complex hydrogels (PECHs) prepared with polysaccharides only, including polyampholyte, low toxicity, green, and clean production, have endowed them great application potentials as the adsorbents for dye-containing wastewater treatments. In the current study, the PECH of chitosan (CTS) and carboxymethylcellulose (CMC) was prepared by semi-dissolution acidification sol–gel transition (SD-A-SGT) method. The hydrogel was formed by the strong electrostatic interaction of cationic NH 3 + groups of CTS and the anionic COO − groups of CMC. This simple but efficient means exhibited great potentials in constructing PECHs with uniform composition and controllable sol–gel transitions. Molecular dynamics simulation was first employed to predict the formation process and the microstructure of PECHs prepared by SD-A-SGT method. The structure and properties of the CTS-CMC PECHs were also characterized by Fourier transform infrared spectroscopy, SS 13 C-NMR, scanning electron microscopy, mechanical tests, and rheological measurements, respectively. Taking the advantage of amphoteric polyelectrolyte properties, adsorption properties of anionic and cationic dyes were investigated using sunset yellow FCF and methylene blue as model dyes, respectively. The PECHs prepared in the present work had good adsorption capacity for both cationic and anionic dyes with maximum adsorption capacity of 212.83 mg/g for sunset yellow FCF and 167.35 mg/g for methylene blue. Therefore, this PECH would be a promising environmentally friendly adsorbent for the treatment of functional molecules with different charges.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48986
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IF 2.52
Wei Wei,Yingying Zhao,Bowen Zhang,Yuqing Cui,Xiaojie Li,Xiaoma Fei,Xiaoya Liu
Amino-modified silica nanoparticles (SiO 2 ─NH 2 ) were first prepared by hydrolytic condensation of tetraethyl orthosilicate and 3-aminopropylmethyldiethoxysilane. Then, organic–inorganic hybrid particles (SiO 2 ─SMA) were prepared by the amidation reaction between SiO 2 ─NH 2 and poly(styrene- alt -maleic anhydride) (SMA). Subsequently, SiO 2 ─SMA particles were employed for modifying bisphenol-A epoxy/anhydride thermoset. Compared with pure cured epoxy, the modified epoxy thermosets with only 1 wt % of SiO 2 ─SMA particles could achieve a simultaneous toughening and reinforcing performance. The tensile strength, impact strength, and fracture toughness of epoxy thermoset were increased by 14.1, 44.3, and 114.4%, respectively. Moreover, the modification also improved the thermal stability of epoxy thermosets, and the modulus and glass transition temperature of cured resin were not sacrificed. It can be attributed to the rigid structure of SiO 2 , as well as the anhydride and carboxyl groups onto the surface of SiO 2 ─SMA particles participating in the epoxy curing reaction and effectively enhancing the crosslinking density of epoxy thermoset.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 32
·48946
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IF 2.52
Kui Wang,Lu Shen,Changyuan Song,Yonggang Zhang,Peng Chen
In this work, methods for reactive coating with graphene (method A and B) are performed to demonstrate feasible ways to functionalize ultra-high-molecular weight polyethylene (UHMWPE) fibers. First, fiber surfaces were polarized by polydopamine (PDA) with amino and hydroxyl groups. In method A, a benchmark method, polarized fibers were dipped into graphene oxide (GO) suspensions for multiple (e.g., eight) cycles to absorb GO, which was then reduced into graphene on fiber surface. In method B, dipping operations were repeated for the same number of cycles, but treatment using 3-aminopropyltriethoxysilane (APS) was applied to induce reactions between the hydroxyl groups and APS, followed by the same reduction treatment. Compared with method A, method B generated fibers with improved and durable surface electric resistance (10 4 Ω cm −1 ). The surface morphology and formation of reduced graphene oxide (rGO) conductive networks of the two methods were analyzed. Results indicated that increasing content and the uniform distribution of rGO are beneficial to obtain a conductive network with low and durable surface electric resistance. This deduction was confirmed by loading amounts of rGO and AFM results. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48946.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 31
·48936
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IF 2.52
Chang Li,Yalong Hu,Jiazhi Zhang,Liming Shen,Ningzhong Bao
A series of sodium iron titanate (NFTO)–fluorocarbon composite coatings have been prepared with the liquid-phase blending method. The effects of two types of NFTO, NFTO platelets, and NFTO whiskers, on the tribological and corrosion behaviors of the composite coatings, are systematically studied. The results show that the addition of NFTO can significantly enhance the friction-reducing and wear resistance performances of the fluorocarbon coating. Under dry sliding, the minimum specific wear rate is 1.67 × 10 −4 mm 3 /Nm for the platelet-filled composite coatings and 1.15 × 10 −4 mm 3 /Nm for the whisker-filled composite coatings, respectively, showing a decrease of 83.5 and 88.6% than that of pure coating. Under a simulated seawater environment, the minimum specific wear rate is 5.44 × 10 −5 mm 3 /Nm for the platelet-filled composite coatings and 0.84 × 10 −5 mm 3 /Nm for the whisker-filled composite coatings, respectively, showing a decrease of 90.5 and 98.5% than that of pure coating. The morphologies of worn surfaces, wear debris, and transfer films are analyzed, and the corresponding wear resistance mechanisms are discussed. The electrochemical impedance spectroscopy certifies a remarkably improved corrosion resistance of the composite coatings which have been immersed in 3.5 wt % NaCl solution for 30 days. The composite coating reinforced with 7.5 wt % platelets shows the highest resistance of 256.3 × 10 6 Ω·cm 2 , approximately two orders of magnitude higher than that of pure coating. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48936.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 45
·49395
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IF 2.52
Jianguang Huang,Peng Li,Weihong Hu,Ruikui Du,Guizhe Zhao,Zhi Wang
The toughness of polycyanate ester is improved by adding epoxy pre-polymer with varying molecular weights. The curing mechanism of epoxy prepolymer (PreEP) and cyanate ester (CE) is discussed based on differential scanning calorimeters and Fourier-transform infrared spectroscopy. The mechanical, phase separated structures and thermal properties of PreEP/CE are also evaluated. It is found that the molecular weight of PreEP can reach 1,800 when it is cured at 90°C for 45 min by using a set amount of polyetheramine. Meanwhile, by increasing the molecular weight of the prepolymer, the mechanical properties of PreEP/CE show increased first, and then decreased. 0.2 PreEP/CE has the highest bending strength and impact strength (105.8 MPa and 18.3 kJ·m −2 ). There are 26.7 and 114.5% higher than those of polycyanate ester, respectively. The tougher PreEP/CE is attributable to the phase-separated structures and the decrease in the cross-linked product (Oxazolidinone) in PreEP and CE. The method showed in this article provides a new way to improve the toughness properties of thermoset resin.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 44
·49376
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IF 2.52
Zhaoqi Niu,Dan Tian,Long Yan,Xiaoyan Ma,Chengshuang Zhang,Xiao Hou
3,13-Diglycidyloxypropyloctaphenyl double-decker silsesquioxane (EP-DDSQ) was synthesized by process of alkaline hydrolysis condensation of phenyltrimethoxysilane and corner capping reaction of methyldichlorosilane, followed by hydrosilylation with allyl glycidyl ether, and the resultant structure was confirmed by fourier transform infrared spectrometer (FTIR) and nuclear magnetic resonance (NMR), respectively. The thermosetting phenol-formaldehyde (PF) resin was then modified by EP-DDSQ, and the reactivity of PF resin with EP-DDSQ and thermal pyrolysis of modified cured resin were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface morphologies of modified resins at high temperature were characterized with field emission scanning electron microscope (FESEM), and chemical structure of modified resins was analyzed through X-ray photoelectron spectrometer (XPS). The results showed that the appropriate addition of EP-DDSQ did not affect the curing temperature of the PF resin itself, but could improve the heat resistance of the system. When the amount of EP-DDSQ added was 10%, the initial degradation temperature of PF resin was increased by 49.31°C, and when the amount of EP-DDSQ added was 16%, the char yield of which was reached up to 61.39%, compared with that of pure PF resin (TGA 1,000°C of 57.62%) at Ar atmosphere. More importantly, the modified resin formed a regular and dense layer of SiC and SiO x ceramic on the surface after ablation in the muffle furnace at 800°C air atmosphere, which is very important for ablative resistant materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49350
·
IF 2.52
Feifei Gao,Mingli Jiang,Wencheng Liang,Xiangchen Fang,Fudong Bai,Yan Zhou,Meidong Lang
In this study, a kind of novel composite nanofibrous mats with cellulose diacetate-graft-poly(ethylene terephthalate) (CDA- g -PET) and Type I collagen were obtained by electrospinning and five different ratios of CDA -g- PET/Type I collagen (1:0, 1:0.1, 1:0.2, 1:0.3, 1:0.4) were set to explore the effects of components on its properties. The scanning electron microscope images demonstrated that the formation of uniform and smooth nanofibers with free beads. Compared with pure CDA -g- PET mats, the composite materials transformed into hydrophilic ones with increasing the content of Type I collagen. Moreover, the tensile strength of the composite nanofibrous mats got higher, while its water vapor transmission rate got lower after blending with Type I collagen. In addition, the cell proliferation and adhesion on composite nanofibrous mats were improved according by the results of bone marrow mesenchymal stem cells (BMSCs) culturing experiments. Especially, the cells growth attained optimum when the CDA -g- PET/Type I collagen ratio reached 1:0.3 and 1:0.4, where showed no significant difference. In consequence, the above results indicated that the novel composite nanofibrous mats consisted of CDA -g- PET and Type I collagen obtained by electrospinning combined good mechanical strength of CDA -g- PET and excellent biological functions of Type I collagen. The nanoscale structure might mimic the nanofibrous extracellular matrix feature, which present the potential use in cells culture.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49365
·
IF 2.52
Xiaoqin Zhang,Shugang Ma,Ang Shen,Jin Zhu,Zhisen Shen,Jinggang Wang,Xiaoqing Liu
Poly(butylene terephthalate-co-butylene 2,5-furandicarboxylate) copolyesters (PBTFs) were synthesized from 1,4-butanediol, dimethyl terephthalate (DMT), and 2,5-furandicarboxylic acid (FDCA) by a two-step polymerization method. Their chemical structures were confirmed by Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and carbon nuclear magnetic resonance before thermal properties were explored with differential scanning calorimeter and thermogravimetric analyzer. Results showed that PBTFs changed from semi-crystalline to completely amorphous when the content of FDCA unit was increased to 45 mol% at first, and then became crystallographic again with the further increment of FDCA unit to 75 mol%. For their mechanical properties, the tensile modulus and strength showed the similar trend, decreasing firstly and then increasing later. Their barrier to carbon dioxide and oxygen became better with the increasing of furan content due to the rigidity and higher polarity of furan ring. The performance of PBTFs copolyesters was investigated clearly, and the relative content of FDCA and DMT can be adjusted to satisfy different performance requirements.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 5
·49772
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IF 2.52
Xiang Chen,Haojie Yu,Li Wang,Nan Wang,Qian Zhang,Weibin Zhou,Md Alim Uddin
There is a problem with directly loading insulin into the polymerized glucose-responsive microneedle (MN) patch due to that polymerization conditions and solvents may damage the activity of insulin. In this study, we report a totally polymerized phenylboronic acid-based MN patch, and insulin was directly loaded in MNs by a mild drop/dry procedure. MN patch was prepared by copolymerization of N -isopropyl acrylamide, N -vinyl-2-pyrrolidone, and 3-acrylamidoephenylboronic acid in MN mold. The MN patch showed good glucose-dependent swelling behavior in pH 9.0 at 27°C. After insulin loading procedure, insulin was distributed on and within the MNs. About 43.2% of total insulin was diffused into MNs' interior. As a result, the release of insulin on MNs' surface was uncontrolled by MNs and rapidly finished after ~10 min. However, the release of insulin within MNs was depended on glucose concentration, and insulin was released 1.6 times more at 4 g/L than at 1 g/L glucose concentration after 12 h. Although further improvements are needed to make MN patch responding in physiological environment, this work suggests a solution for directly loading insulin in polymerized glucose-responsive MNs.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 2
·49668
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IF 2.52
Yuanyuan Li,Peixian Li,Minjie Wu,Xiaoyan Yu,Kimiyoshi Naito,Qingxin Zhang
Polylactic acid (PLA) polymers are promising substitutes for polluting fossil fuel-derived polymers in the field of food safety due to their environmental friendliness, good biocompatibility, and degradability. However, their poor mechanical property limits their practical utilization. In this study, abundant natural halloysite nanotubes (HNTs) were incorporated into PLA to address these issues. To overcome interfacial incompatibility between the matrix (PLA) and nanofillers (HNTs), 3-Aminopropyltrimethoxysilane (APS) were firstly grafted onto HNTs to form end-up amino groups which were served as binding sites for the polycondensation of lactic acid precursors. This formed PLA modified HNTs (pHNTs) precursor was further mixed with bulk PLA polymers to prepare the composite films by the solvent casting method. Compared with the pristine composite, the PLA/pHNTs composites show better thermal stability and mechanical properties, and the composite with 2 wt% pHNTs exhibits the best performance.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 3
·49696
·
IF 2.52
Shanwen Zhu,Wenjun Wang,Zahidul MD Islam,Yaqin Fu,Yubing Dong
Shape memory epoxy (SMEP) is a high performance shape memory polymer; however, is extremely flammable which severely restricts its applications. In this work, a novel polydopamine modified ammonium polyphosphate (PDA@APP) flame retardant was prepared to improve the flame retardant and enrich the response method of SMEP. Through flame retardancy test confirmed that the flame retarding properties of the PDA@APP/WEP composites significantly improved than the APP/WEP composites, the limiting oxygen index (LOI) values of the APP/SMEP and the PDA@APP/SMEP samples increased by 29.8% and 32.2%, respectively. Moreover, the PDA@APP/WEP composites had excellent light response shape-memory performance. Interestingly, the PDA@APP/WEP treated polyester fabric exhibited excellent light crease recovery performance and excellent flame retardant property. This work develops a new method for fabric crease recovery and will help broaden the application of WEP and its composites.
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高影响因子
危险品化学品经营许可证（带存储）