JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 39
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IF 1.866
Jianjun Zhou,Jin Chen,Ming He,Jianfeng Yao
Cellulose nanocrystals (CNCs) were used as a sustainable additive to improve the hydrophilicity, permeability, antifouling, and mechanical properties of blend membranes. Different CNC loadings (0–1.2 wt %) in cellulose acetate (CA) membranes were studied. The blend membranes were prepared by a phase-inversion process, and their chemical structure and morphological properties were characterized by attenuated total reflectance–Fourier transform infrared spectroscopy, scanning electron microscopy, porosity, and mean pore size and contact angle measurement. The blend membranes became more porous and more interconnected after the addition of CNCs. The thickness of the top layer decreased and a few large holes in the porous substrate appeared with increasing CNC loading. In comparison with the pure CA membranes, the pure water flux of the blend membranes increased with increasing CNC loading. It reaches a maximum value of 76 L m −2 h −1 when the CNC loading was 0.5 wt %. The antifouling properties of the CA membrane were significantly improved after the addition of CNCs, and the flux recovery ratio value increased to 68% with the addition of 0.5 wt % CNCs. In comparison with that of the pure CA membranes, the tensile strength of the composite membranes increased by 47%. This study demonstrated the importance of using sustainable CNCs to achieve great improvements in the physical and chemical performance of CA ultrafiltration membranes and provided an efficient method for preparing high-performance membranes. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43946.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 4
·45746
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IF 1.86
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Changhong Lin,Yan Zhou,Yuming Yang
Polydopamine (PDA) layers and particles self-polymerized by dopamine have ultraviolet (UV) absorbing property besides versatility and adhesive ability. Herein, a facile strategy for preparing poly(vinylidene fluoride) (PVDF) membrane coated with a thick PDA layer was developed to decrease UV transmittance through the surface modification of PVDF membrane. The PVDF membrane was modified by PDA deposition after pretreated with KOH/alcohol and KMnO 4 /KOH solution. Furthermore, we investigated the effect of coating conditions such as concentration of dopamine and Tris–HCl buffer solution, coating time, and temperature on the performance of membranes. The characterization results indicated that it is more conductive for PDA deposition on the surface PVDF-OH films than original PVDF films. Most importantly, UV transmittance of PVDF-OH film modified in dopamine solution under optimum condition for one time can decrease to as low as 0.122% at 320 nm, which showed excellent UV-shielding property. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45746.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 10
·45728
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IF 1.86
Cuijia Duan,Xingming Jie,Haitao Zhu,Dandan Liu,Weiming Peng,Yiming Cao
With MOFs of Cu 3 (BTC) 2 and ZIF-8 as the dispersed phases and four polyimides with CO 2 permeabilities ranging from 1.36 to 564 barrer as the continuous phase, the influence of metal organic frameworks on the gas-separation properties of mixed-matrix membranes (MMMs) was investigated. The results show that the gas permeabilities of all of the prepared MMMs greatly increased and even largely exceeded the predicted value of the Bruggeman model; for example, with the same Cu 3 (BTC) 2 loading of 21.3 vol %, the O 2 permeability increase rate of our prepared Cu 3 (BTC) 2 /Matrimide 5218-20 MMMs was 2.26 times, whereas that predicted by the Bruggeman model was only 1.05 times. In addition, when the gas permeability of the polymeric phase was far lower than the dispersed phase of ZIF-8 or Cu 3 (BTC) 2 compared with ZIF-8, which had a particle size ( R ) around 150 nm, Cu 3 (BTC) 2 of 5–15 µm showed a little better enhancing effect on the gas-permeation performance of the MMMs. In addition to the properties of the dispersed and continuous phases, we speculated that the ratio between R of the dispersed phase to the membrane thickness ( L ) played an important role for MMMs; the larger R / L was, the greater the gas permeability of the MMMs was. This speculation was initially evidenced by the ZIF-8/ODPA/TMPDA-20 MMMs with different L s. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45728.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 6
·45831
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IF 1.86
Jing Zhang,Liqun Chen,Jiada Chen,Dan Wu,Jie Feng
We demonstrated an extremely facile way to fabricate inorganic–organic microgels with pH sensitivity and fluorescence. Aqueous dextran microgels are crosslinked by ZnO quantum dots (QDs). The ZnO@Dextran microgels were synthesized by simply mixing amino-modified ZnO (ZnO QDs) with carboxymethyl dextran (CMD) while stirring. The hybrid microgels showed an average diameter of ∼5 μm and strong fluorescence under ultraviolet (365 nm) irradiation. Up to 79.3 wt % of ZnO QDs were loaded into microgels. The ZnO QDs crosslinkage in the hybrid microgels structure enabled the microgels to degrade under mild acidic environment due to pH sensitivity of ZnO QDs. After loading of doxorubicin (Dox), the microgels were used as drug carriers for pH-controlled release of Dox. The degradation of the microgels and the release of loaded cargos could be monitored by detecting fluorescence intensity of the microgels. Moreover, owing to the cytotoxicity of ZnO QDs at their destination, drug-loaded ZnO@Dextran microgels can be used for synergistic therapy. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45831.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 38
·45326
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IF 1.86
Yi Chen,Wenyong Liu,Guangsheng Zeng,YueJun Liu
The microporous hydrogels (P n -C m gels) composed of poly(dimethylaminoethyl methacrylate) and carboxymethylchitosan were synthesized in situ radical polymerization by using nano γ-Fe 2 O 3 particles as pore-agent. The microporous structure formed through eliminating the Fe 2 O 3 particles was designed to achieve a faster response rate and better drug loading effect. Comparing to the neat gels, P n -C m gels exhibit deteriorative mechanical properties with the increased pores, while the gels still keep the elastic network structure which could bear some degree of tensile and compression deformation. Meantime, P n -C m gels show similar temperature and pH double responsiveness with same isoelectric point shrink as that of neat gels, the swelling ability decreases slightly, and the deswelling rate increases with the increase of pores. Moreover, the 5-fluorouracil was used as a target drug to explore the potential of this gel applied as drug-release system. For P n -C m gels, the more pores and carboxymethyl chitosan inside the gels are beneficial to the drug loading, all gels show a burst release of drug, being followed by a slow and sustained release with different rate. Comprehensively, the P n -C m gels exhibit a better sustained release effect in the simulated stomach condition (pH = 2.1), the related release mechanism could be interpreted by the superposition of Fickian diffusion. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45326.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 38
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IF 1.866
Shuyi Wang,Xiaohui Tian,Jinyu Sun,Jin Liu,Junchao Duan
Na-montmorillonite/polyethyleneimine- g -poly(methyl methacrylate) (Na-MMT/PEI- g -PMMA) nanocomposite latexes were prepared by soap-free emulsion polymerization in the aqueous suspension of Na-MMT. The exfoliated morphology of the nanocomposites was confirmed by XRD and TEM. With the aim of improving morphology and mechanical properties of natural rubber latex (NRL) films, the synthesized Na-MMT/PEI- g -PMMA nanocomposites were mixed with NRL by latex compounding technology. The results of SEM and AFM analysis showed that the surface of NRL/Na-MMT/PEI- g -PMMA film was smoother and denser than that of pristine NRL film while Na-MMT was dispersed uniformly on the fracture surface of the modified films, which suggested the good compatibility between NRL and Na-MMT/PEI- g -PMMA. The tensile strength of NRL/Na-MMT/PEI- g -PMMA films was increased greatly by 85% with 10 phr Na-MMT/PEI- g -PMMA when Na-MMT content was 3 wt % and the elongation at break also increased from 930% to 1073% at the same time. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43961.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 37
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IF 1.866
Peng Wang,Fusheng Yang,Liang Li,Zaisheng Cai
Two phosphorus-containing phenolic amines, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based derivative (DAP) by covalently bonding DOPO and imine (SB) obtained from the condensation of p -phenylenediamine with salicylaldehyde, and its analog (AP) via the addition reaction between diethyl phosphite and SB, were used to prepare flame-retardant epoxy resins. The burning behaviors and dynamic mechanical properties of epoxy thermosets were studied by limited oxygen index (LOI) measurement, UL-94 test, and dynamic mechanical analysis. The flame-retardant mechanisms of modified thermosets were investigated by thermogravimetric analysis, Py-GC/MS, Fourier transform infrared, SEM, elemental analysis, and laser Raman spectroscopy. The results revealed that epoxy thermoset modified with DAP displayed the blowing-out effect during UL-94 test. With the incorporation of 10 wt % DAP, the modified thermoset showed an LOI value of 36.1% and V-0 rating in UL-94 test. The flame-retardant mechanism was ascribed to the quenching and diluting effect in the gas phase and the formation of phosphorus-rich char layers in the condensed phase. However, the thermoset modified with 10 wt % AP only showed an LOI value of 25.7% and no rating in UL-94 test, which was possibly ascribed to the mismatching of charring process with gas emission process during combustion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43953.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 35
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IF 1.866
Jin Liu,Xiaohui Tian,Jinyu Sun,Yizhong Yuan
Poly(methyl methacrylate- co -butyl methacrylate) [P(MMA- co -BMA)] nanoparticles were synthesized via emulsion polymerization, and incorporated into natural rubber (NR) by latex compounding. Monodispersed, core-shell P(MMA- co -BMA)/casein nanoparticles (abbreviated as PMBMA-CA) were produced with casein (CA) as surfactant. The chemical structure of P(MMA- co -BMA) copolymers were confirmed by 1 H-NMR and FTIR analyses. Transmission electron microscopy demonstrated the core–shell structure of PMBMA-CA, and PMBMA-CA homogenously distributed around NR particles, indicating the interaction between PMBMA-CA and NR. As a result, the tensile strength and modulus of NR/PMBMA-CA films were significantly enhanced. The tensile strength was increased by 100% with 10% copolymer addition, when the molar ratio of MMA:BMA was 8:2. In addition, scanning electron microscopy and atomic force microscopy results presented that the NR/PMBMA-CA films exhibited smooth surfaces with low roughness, and PMBMA-CA was compatible with NR. FTIR-ATR analyses also suggested fewer PMBMA-CA nanoparticles migrated out of NR. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43843.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 36
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IF 1.866
Jiangquan Liu,Xiaoguang Ying,Hongxun Wang,Xiao Li,Weiying Zhang
Polyethylene glycol grafted calcium alginate hydrogel microspheres are synthesized by ring-opening and addition reaction of epoxy chloropropane. FTIR, 13 C NMR, optical microscope, SEM, TG, and DSC are used for characterization. Swelling behaviors are studied and it is found that polyethylene glycol grafted calcium alginate microspheres are improved in anti-swelling properties. Protein-imprinted polyethylene glycol grafted calcium alginate hydrogel microspheres exhibit enhanced specific rebinding quantity (11.16 mg/g) and selective recognition properties (4.71 against BHb), towards target molecule in the presence of competing protein, compared with that of the unmodified samples (4.96 mg/g and 1.75, respectively). © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43617.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 38
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IF 1.866
Xinghua Guan,Fang Chen,Zhiguang Li,Hualong Zhou,Xiaoyan Ma
Diblock copolymers poly(methyl methacrylate)- block -polystyrene with three different molar ratios [poly(methyl methacrylate)/polystyrene (PS) = 1:1, 1:1.5, and 1:1.8] were synthesized by atom transfer radical polymerization and used as a polymer matrix for gel polymer electrolytes (GPEs). The positron annihilation lifetime spectroscopy was applied to determine the free-volume behaviors of different GPEs, respectively. We illustrated that a proper PS ratio may led to the formation of a high fraction of free volume, and the influence of the PS ratio on the free-volume fraction was caused by the different morphologies of the GPEs because of the different packing densities of the PS rigid block. The ionic conductivity was correlated with the free volume in the GPE through the study of the ionic conductivity dependence on the temperature; this followed the Vogel–Tamman–Fulcher equation. Moreover, an ionic conductive model was proposed, in which variations of the free-volume behavior provide different ionic-conducting abilities. Thermogravimetric analysis indicated that GPEs based on different block copolymers exhibited high liquid-electrolyte preservation properties. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43901.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 37
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IF 1.866
Yan Wu,Zongliang Du,Haibo Wang,Xu Cheng
To construct waterborne polyurethane with excellent water resistance and mechanical properties, an organic-inorganic hybrid nanocomposite based on modified halloysite nanotubes (mHNTs) and polyurethane was prepared. The HNTs were modified with an amino-silane coupling agent (KH550) and then reacted with polypropylene glycol, 2,2-Dimethylol propionic acid, and Toluene diisocyanate to form mHNTs/PU aqueous dispersions. The structure of the siloxane functionalized mHNTs was confirmed by a Fourier transform infrared study. The PU/mHNTs composites were characterized by using differential scanning calorimetry, scanning electronic microscopy, thermal gravimetric analysis, a tensile test, particle size analysis, and a water swelling experiment. The tensile strength, Young's modulus, and elongation at the break of the composite polymer with 0.5 wt % mHNTs was shown to be significantly improved, by approximately 200%, 200%, and 30%, respectively. An excess amount of mHNTs could weaken the reinforcing effect and stability of the composite emulsion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43949.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 34
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IF 1.866
Jie Chen,Xiaoying Li,Yigang Wang,Jinrui Huang,Ke Li,Xiaoan Nie,Jianchun Jiang
A novel plasticizer epoxidized dimeric acid methyl ester (EDAMe) based on rubber seed oil was synthesized. Chemical structure of EDAMe was characterized by Fourier transform infrared (FTIR) and gel permeation chromatography (GPC). Effects of EDAMe as secondary plasticizer and its substitution of commercial plasticizer dioctyl terephthalate (DOTP) in soft poly(vinyl chloride) (PVC) films were studied. The thermal properties, mechanical properties and migration stabilities of PVC films were explored with DMA, TG, TG–FTIR, dynamic thermal stability analysis, tensile and migration tests. The results indicated that the epoxidized rubber seed oil based ester has significantly higher thermal stability than DOTP. When DOTP was substituted with 20% (m/m) EDAMe, the results of initial decomposition temperature ( T i ), 10% and 50% mass loss temperatures ( T 10 and T 50 ), and the first maximum weight-loss temperature rate ( T P1 ) reached 267.2 °C, 263.5 °C, 307.3 °C and 298.9 °C, respectively. Furthermore, flexibility of the obtained PVC films enhanced significantly with the adding of EDAMe. The migration stabilities of EDAMe was also investigated and showed good migration resistance. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43668.
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