JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 31
·46593
·
IF 1.901
Li Yang,Ting Wang
Cyclodextrin-grafted cellulosic hydrogel beads (CD + @HEC-CMC-gel) were prepared through electrostatic and host–guest interactions. β-Cyclodextrin (CD + ) modified with quaternary ammonium groups was used as the electropositive binding site, and carboxymethyl cellulose (CMC) in a double-network hydrogel structure was used as the electronegative binding site. The double-network structure was obtained by controlling the crosslinking of CMC and hydroxyethyl cellulose (HEC) in the presence of epichlorohydrin. The electrostatic interaction was used to graft CD + onto the electronegative double-network structure. Scanning electron microscopy indicated an obvious change in the cellulosic double network after grafting of CD + . The grafting content of CD + in CD@HEC-CMC-gel is determined as 93.10 ± 0.74% by the photometric titration method. In order to evaluate the assembling and releasing ability, ibuprofen (IBU) was selected to be encapsulated in CD + @HEC-CMC-gel by host–guest interaction. In addition, the release of IBU by the hydrogel beads was explained by several kinetic models. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46593.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 31
·46578
·
IF 1.901
Dan Lv,Abdul Qadeer Dayo,An-Ran Wang,Sadia Kiran,Yi-Le Xu,Sha Song,Wen-bin Liu,Jun Wang,Bao-Chang Gao
A new high-performance copolymer was successfully obtained via concerted catalysis polymerization of mono-functional benzoxazine (P-a) and self-promoted 4-aminophenoxy phthalonitrile (4-APN) monomers. The FTIR and DSC curves of the P-a/4-APN in different blend ratios suggested that the monomer blends can be completely cured without the addition of curing additive. The P-a/4-APN copolymers were cured at relatively lower curing temperatures and time. The TGA curves revealed that the P-a/4-APN copolymers have good thermal stability in terms of T 5 , T 10 , and char yield. A gradual increase in the glass transition temperature ( T g ) values and decline were seen in the storage modulus as the loading of 4-APN was increased from 10 to 30 wt % in the copolymer. The SEM analyses showed that copolymer's fracture surface is dendritic, showing the stress has been dispersed to a certain extent. The study revealed that the poly(P-a/4-APN) copolymer have much better thermal stabilities than the poly(P-a), and the prepared copolymer can be used as a high-performance thermosetting resin. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46578.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46542
·
IF 1.901
Yangze Huang,Erlei Yu,Yanke Li,Zhong Wei
A series of hyperbranched poly(ɛ-caprolactone) (HPCLs, denoted as D X ) with different molecular weights were synthesized by the copolymerization of GPCL (PCL initiated by glycidol) and succinic anhydride. The chemical structure of D X was characterized by 1 H-NMR gel permeation chromatography and inherent viscosity, and D X was used as the plasticizer for poly(vinyl chloride) (PVC) compared to traditional plasticizer di-(ethylhexyl) phthalate (DEHP). The thermal properties, morphology, mechanical properties, and migration stabilities of PVC films were explored with differential scanning calorimetry, thermogravimetric analysis, scanning electron microscope, tensile, and migration tests. PVC/D 1 exhibited the best plasticization efficiency up to 107%, with enhanced tensile strength (18.5 MPa) and ultimate elongation (416%) compared to PVC/DEHP (11.5 MPa and 375%, respectively). PVC/D 1 exhibited remarkably high plasticization efficiency as compared to PVC/DEHP at a plasticizer concentration of PVC below 40 wt %. Moreover, the migration test for PVC/D X films exhibited minimal plasticizers migration even at very harsh conditions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46542.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 42
·46758
·
IF 1.901
Dongxing Zhen,Gaohong He,Xinlong Xu,Xiaoming Yan,Naixu Du,Xue Gong,Tiantian Li,Yan Dai,Xuemei Wu
Sulfonated poly(phthalazinone ether sulfone ketone) (SPPESK) is a kind of novel non-fluorine polymer, whose high proton conductivity is dependent on high degree of sulfonation, which resulting in loss of dimensional stability. SPPESK/superacid sulfated zirconia (SZrO 2 ) composite proton exchange membranes are fabricated first. The composite membrane shows good dimensional stability, ascribing to the restriction effect of hydrogen bonding force on the mobility and relaxation of polymer chains. Introducing SZrO 2 simultaneously enhances the conductivity and anti-methanol permeation, owing to the connected ion domains, enlarged and aggregated ion clusters, excess proton conduction sites, and good blocking effect to methanol of SZrO 2 . For composite membrane containing 1.5 wt % SZrO 2 , the highest conductivity of 180 mS cm −1 is obtained at 80 °C. Compared with pristine SPPESK and Nafion 115, the methanol permeability is reduced by 54 and 77%, and the maximum power density of direct methanol fuel cell is enhanced by 133 and 25%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46758.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 40
·46708
·
IF 1.901
Run-Hui Yu,Kai Li,Yue-Zhi Cui,Fu-Rong Tao,Bing Zheng,Xiao-Shuang Ma,Tian-Duo Li
A novel amino-functionalized polystyrene copolymer (PS-NH 2 ) was designed and synthesized with styrene and 4-vinylbenzyl amine. Additionally, an amino modified glass (G-NH 2 ) was obtained as a carrier. (PS-NH 2 /pyrene)/G-NH 2 fluorescent nanofibrous membrane [named (PS-NH 2 /pyrene)/G-NH 2 ] was designed and prepared via electrospinning technique to detect representative saturated nitroaromatic (NAC) explosive vapor. The (PS-NH 2 /pyrene)/G-NH 2 showed highly fluorescence stability in ambient condition and further displayed a high quenching efficiency of 70.9% toward trinitrotoluene (TNT) vapor (∼10 ppb) with an exposure time of 150 s at room temperature. The abundance of amino groups could effectively adsorb NACs and the binding of electron-deficient NACs to the amino groups on the (PS-NH 2 /pyrene)/G-NH 2 surface led to the formation of charge-transfer complexes. The quenching constant ( K SV ) to TNT was obtained to be 1.07 × 10 11 mL/g in gaseous phase with a limit of detection up to 2.76 × 10 −13 g/mL. Importantly, the (PS-NH 2 /pyrene)/G-NH 2 showed notable selectivity toward TNT and 2,4-dinitrotoluene vapors. Straightforwardly, the colorimetric sensing performance can be visualized by naked eye with a color change for detecting of different vapor phase NACs explosives. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46708
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 1
·46906
·
IF 1.901
Jinhui Liu,Jieting Geng,Kai Liu,Lingli Zou,Zhaobo Wang,Jing Hua
Molybdenum-based random 1,2-polybutadiene (1,2-PB) rubber, with its excellent wet skid resistance, low rolling resistance, and low heat buildup, can be used for green tread rubber, and it has significant benefits for the enhancement of the mechanical strength of 1,2-PB. In this study, we investigated in detail the effects of the electronegativity and steric hindrance of the cocatalyst on the stereoselectivity of the resulting polymers. In the case of cocatalysts with moderate electronegativities, the active centers were more stable; this resulted in a larger molecular weight and a higher conversion, whereas a cocatalyst with excessive electronegativity tended to initiate cationic polymerization. The high sterically hindered substituent restricted the coordination configuration of the monomer; this ultimately resulted in the increase in the 1,2 structure to 90%. Fourier transform infrared analysis showed that the content of trans -1,4 structure increased from 7 to 66%, and its crystallinity reached 59.2%, as calculated with differential scanning calorimetry when triethyl aluminum was used as the cocatalyst. Consequently, trans -1,4-polybutadiene crystals were introduced into the 1,2-PB elastomer in one step; this could be a promising facile route for strengthening 1,2-PB. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46906.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 8
·47100
·
IF 1.901
D. Hu,L. Yan,T. Liu,Z. Xu,L. Zhao
In CO 2 -assisted polyurethane (PU) foaming, the solubility and diffusion coefficient of CO 2 is vitally important to the cell nucleation and growth. This work is aimed at the effect of molecular weights ( M n ) and crosslinking densities ( V e ) on the solubility and diffusion coefficient of CO 2 in PU oligomers. A series of PU oligomers with different M n and V e were synthesized. The solubility and diffusivity of CO 2 in PU oligomers were measured experimentally in the temperature from 80 to 140 °C and with pressures up to 15 MPa. It was shown that the solubility and diffusion coefficients of CO 2 was decreased 20.5 and 21.0%, respectively, with the M n increasing from 5864 to 153,754 g mol −1 at 80 °C, 15 MPa. The solubility and the diffusion coefficient also decreased 11.1 and 38.0% as the V e was increased from 64 to 1493 mol m −3 . Furthermore, the diffusion mechanism of CO 2 in PU oligomers was explored via molecular dynamics simulations. The results indicated that the calculated diffusivity of CO 2 showed the same changing trend as the experimental values, and the smaller M n or crosslinking degree contributed to an increase in fractional free volume and stronger polymer–CO 2 interactions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47100.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 46
·46764
·
IF 1.901
R. Zhang,L. Wang,C. Zhang,R. Yang,X. Sun,B. Song,C.-P. Wong,Y. Xu
A novel kind of conductive self-assembled colloid particles (CPs) was prepared from poly(3-thiophenecarboxylic acid) (PTPCA) and chitosan (CS) via electrostatic interaction and π–π interaction. The resultant CPs were then cast on the electrode surface to provide a platform for fabricating high-sensitive biosensor. It should be noted that the good conductivity of PTPCA can accelerate the electron transfer and facilitate the signal transduction from the CP film to the underlying electrode. This advantage endowed the biosensor with high sensitivity for H 2 O 2 detection. Under the optimal conditions, a linear range from 1 × 10 −11 to 1 × 10 −5 mol L −1 with a detection limit of 3 × 10 −12 mol L −1 was obtained for H 2 O 2 detection. The biosensor can be used to detect H 2 O 2 in commercial disinfector with satisfactory results. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46764.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 39
·46696
·
IF 1.901
Mengmeng Wang,Gang Sun,Peihui Han,Xin Su,Yujun Feng
Thermoviscosifying polymers are attractive for enhancing oil recovery owing to their exceptional thickening power as temperature increases. However, the polymers reported to date show inadequacies including obligatory high polymer concentration to get the thermothickening ability because of their low molecular weight (MW), and inconvenient post-treatment due to the high viscosity after manufacturing. To overcome these drawbacks, inverse emulsion polymerization was used here for preparing polyether-based thermoviscosifying polymers (TVP-Ps) by grafting acrylic monomers onto triblock copolymers PEO–PPO–PEO. It was found the MW of final products could reach 8 million Daltons, making them thermoviscosifying at 0.2 wt %. The viscosity of polymerized inverse emulsions was as low as 175 mPa·s, leading to direct dispersing. The TVP-Ps containing Pluronic F127, F108, F68 all exhibited significant thermothickening behaviors in both aqueous solutions and brines, and the critical thermoassociative temperature could be tuned by changing the nature or amount of Pluronics. After aging at 45 °C for 60 days with equal initial viscosity, TVP-Ps shows 21% higher viscosity retention than the reference polymer without Pluronic, PAMA, and preliminary core flooding test demonstrated TVP-Ps can get 2.1% higher incremental oil recovery than PAMA. This work paves a new avenue for scaled-up preparation and potential use of TVP-Ps. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 134 , 46696
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 35
·46641
·
IF 1.901
Xuelin Huang,Jing Guo,Yunming Yang,Shenglin Li,Shuang Chen,Yuanfa Liu,Sen Zhang
We synthesized a series of poly(acrylonitrile- co -allyl glycidyl ether)- graft -methoxypoly(ethylene glycol) (PAA- g -MPEG) copolymers as novel polymeric solid–solid phase-change materials by grafting methoxypoly(ethylene glycol) (MPEG) to the main chain of poly(acrylonitrile- co -allyl glycidyl ether) (PAA). PAA was the skeleton, and MPEG was a functional side chain, which stored and released heat during its phase-transition process. Fourier transform infrared spectroscopy and 1 H-NMR spectroscopy analysis were performed to investigate the chemical structures. The crystalline morphology and crystal structures were also measured with polarized optical microscopy and X-ray diffraction. Moreover, the thermal-energy-storage properties, thermal stability, and thermal reliability of the PAA- g -MPEG copolymers were characterized by differential scanning calorimetry and thermogravimetric analysis (TGA) methods. These analysis results indicate that the MPEG chains were successfully grafted onto PAA, and we found that the PAA- g -MPEG copolymers had typical solid–solid phase-transition temperatures in the range 11–54 °C and high latent heat enthalpies between 44 and 85 J/g. In addition, the as-prepared PAA- g -MPEG copolymers showed reusability and thermal reliability, as shown by the thermal cycle testing and TGA curves. Therefore, the synthesized PAA- g -MPEG copolymers have considerable potential for thermal energy storage. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46641.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 38
·47965
·
IF 2.188
Wuge Cui,Guancheng Jiang,Yinbo He
Water-based drilling fluids always suffer from high-salt and high-temperature conditions, which cause safety andeconomic problems. Amphoteric copolymers are expected to solve this, although the underlying factors are still controversial. In this study, the AST (an amphoteric copolymer which was synthesized from 2-acrylamide-2-methyl propane sulfonicacid, (3-acrylamidopropyl)trimethyl ammonium chloride and acrylamide) was used as fluid loss additive, kaolinite (KT) was used as an evaluation condition, and a sandwich structure was found on the cross section of the filter cake. Four potential mainstream explanations were analyzed: the polymer properties, rheological behavior, dispersion of platelets, and structure of the filter cake. The sandwich structures in the cross section of filter cake were finally found and were confirmed by energy-dispersive spectroscopy. The sandwich structure, which consisted of an amphoteric polymer and a clay platelet, affected the fluid loss dramatically. This method for studying the cross section of the filter cake on the basis of KT evaluation could be used to investigate the filtration process of other fluid loss additives. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47965.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 39
·47991
·
IF 2.188
Dekang Cheng,Huan Wang,Bin Liu,Shan Wang,Yang Li,Yushuang Xia,Chuanxi Xiong
Flexible dielectric materials with high electric energy density and high-temperature resistant characteristic are of great importance for modern electronics and electrical systems. Herein, two-dimensional molybdenum disulfide (MoS 2 ) nanosheets were efficiently produced via liquid-phase exfoliation and then incorporated into polyimide (PI) to prepare MoS 2 /PI dielectric nanocomposites. Compared to the pristine PI, MoS 2 /PI nanocomposite films exhibited much larger dielectric permittivity while their dielectric losses still maintained relatively low levels. On the other hand, the Weibull breakdown strength of these nanocomposite films initially increased and then decreased with the increase in the MoS 2 content and gave rise to a maximum value of 395 MV m −1 at 1 vol % loading. Combination of the improved dielectric permittivity and breakdown strength makes the MoS 2 /PI nanocomposite film with 1 vol % MoS 2 possess an elevated energy density of about 3.35 J cm −3 . Moreover, good tensile and thermal properties of the nanocomposite films hold great promise for their applications in high-temperature and harsh conditions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47991.
✓ 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）