POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 6
·1788-1794
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IF 2.137
Si Chen,Bo Zhou,Meng Ma,Yanqin Shi,Xu Wang
Permanently antistatic and high transparent PMMA terpolymer, P(MMA-co-HPA-co-SPMA), were reported in this paper, providing a new method to significantly improve the antistatic properties of PMMA without sacrificing transparency. 2-Hydroxypropyl acrylate (HPA) was chosen as a kind of compatilizer because of the good compatibility with both methyl methacrylate (MMA) and sulfopropyl methacrylate potassium salt (SPMA), a potential antistatic agent with a strong hydrophilic group. The mechanical and optical properties of P(MMA-co-HPA-co-SPMA) terpolymer barely show any visibly differences compared to PMMA homopolymer, confirmed through Fourier transform infrared, dynamic mechanical analysis, and a haze meter. Furthermore, antistatic property analysis indicates that only a small amount of SPMA can significantly improve the antistatic properties of the obtained PMMA terpolymers. The surface resistivity of the P(MMA-co-HPA-co-SPMA) sheets could be reduced to 10 9 Ω sq −1 order of magnitude, while the SPMA content reached 0.72 wt%. The hydrophilic groups, the hydroxyl and acrylate sulfonate, on the surface contributed to attract the water molecules, which rendered it a reasonably good antistatic property. These selected terpolymers will provide more opportunities to develop high-performance and antistatic products made from PMMA materials.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 6
·1804-1814
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IF 2.137
Guoxing Yu,Yinfeng Liu,Juan Li
Urea formaldehyde microsphere (UFM) was prepared and used with organic montmorillonite (OMMT) to modify the flame retardant efficiency of ethylene vinyl acetate copolymer (EVA)/intumescent flame retardant (IFR) composites. The results show that single IFR may modify the flame retardancy of EVA, but its efficiency is not good enough. The EVA composite containing 21 wt% IFR is just classified the UL_94 V2 and has a limiting oxygen index (LOI) 24.7 vol%. Combining UFM with IFR does not improve the flame retardancy of EVA/IFR composites, and blending OMMT with IFR only improves its LOI. Adding 2 wt% UFM, 2 wt% OMMT, and 17 wt% IFR into EVA, it obtains the UL_94 V0 without melt dripping and a LOI 29.0 vol%. Also, the peak heat release rate and total heat release decrease a lot. Good synergistic effects among IFR, UFM, and OMMT improve the char residues and modify the char micromorphology of EVA composites, which provide better protect for the underlying resin.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 1
·40-50
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IF 2.137
Feng Su,Xiangke Sun,Rongye Li,Yuandou Wang,Laishun Xi,Yangsheng Chen,Suming Li
A series of poly(ɛ-caprolactone/glycolide)-poly(ethylene glycol) (P(CL/GA)-PEG) diblock copolymers were prepared by ring opening polymerization of a mixture of ɛ-caprolactone and glycolide using mPEG as macro-initiator and stannous octoate as catalyst. Self-assembled micelles were prepared from the copolymers using nanoprecipitation method. The micelles were spherical in shape. The micelle size was larger for copolymers with longer PEG blocks. In contrast, the critical micelle concentration of copolymers increased with decreasing the overall hydrophobic block length. Drug loading and drug release studies were performed under in vitro conditions, using paclitaxel as a hydrophobic model drug. Higher drug loading was obtained for micelles with longer poly(ε-caprolactone) blocks. Faster drug release was obtained for micelles of mPEG2000 initiated copolymers than those of mPEG5000 initiated ones. Higher GA content in the copolymers led to faster drug release. Moreover, drug release rate was enhanced in the presence of lipase from Pseudomonas sp., indicating that drug release is facilitated by copolymer degradation. The biocompatibility of copolymers was evaluated from hemolysis, dynamic clotting time, and plasma recalcification time tests, as well as MTT assay and agar diffusion test. Data showed that copolymer micelles present outstanding hemocompatibility and cytocompatibility, thus suggesting that P(CL/GA)-PEG micelles are promising for prolonged release of hydrophobic drugs.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 7
·1939-1952
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IF 2.137
Xiang Shi,HongXin Shi,HongKe Wu,HaiMin Shen,Peng Cao
In the current study, the novel fluorinated polyurethanes (FPUs) that contained the gemini branched fluoroether side groups on the hard segments were developed. In brief, to obtain these FPUs, a new class of fluorinated gemini diol with double-branched fluoroether side groups was first synthesized and characterized by using Fourier transform infrared spectroscopy, nuclear magnetic resonance, and mass spectrometry. Subsequently, a series of FPUs were designed and prepared by using hexamethylene diisocyanate, poly (tetramethylene oxide glycol), 1,4-butanediol, and fluorinated gemini diol. Analysis of the FPUs' surface properties from contact angle analysis indicated that the water contact angle increased from 81° to more than 120° when the content of fluorinated gemini diol was increased. Differential scanning calorimetry results revealed that introduction of fluorinated gemini dio decreased the T g of FPUs, causing a better phase separation. Results from thermogravimetric analysis studies indicated the thermal stability of FPUs was improved. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed that fluoroether groups migrate to and enrich on the outmost surface of FPUs.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 7
·2002-2009
·
IF 2.137
Man Xi,Yang Jiang
A series of methoxypolyethylene glycol-terminated self-fluorescent polyurethane multi-block copolymers with excellent pH-responsivity, self-fluorescence, and biocompatibility are designed and synthesized. In our design, 1, 4-bis (hydroxyethyl) piperazine is chosen as a pH-responsive segment which can donate or accept protons in response to the change of environmental pH, and fluorescein isothiocyanate is used as a fluorescent dye conjugated into the micelles to offer self-fluorescence. The chemical structure of the polyurethane multi-block copolymers is characterized by nuclear magnetic resonance and Fourier transform infrared spectroscopy. The results of the acid-based titration, the fluorescence spectrometry, and the ultraviolet visible spectroscopy indicate that the polyurethane multi-block copolymers own an excellent pH-buffering capacity responded to the change of pH values and the favorable self-fluorescence property in an aqueous solution. And the ultraviolet absorption peaks of samples are strengthened with increasing of pH values, indicating that methoxypolyethylene glycol-terminated self-fluorescent polyurethane multi-block copolymer can be a pH-dependent fluorescent probe in a broad pH range. In addition, the in vitro cytotoxicity test showed that the polyurethane multi-block copolymer has low cytotoxicity and good biocompatibility, which make it a promising nanoplatform for molecular imaging, diagnosis, and treatment of disease.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 8
·2245-2252
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IF 2.137
Lin Tong,Yakai Feng,Xujun Sun,Ying Han,Dongshun Jiao,Xiaohua Tan
The encapsulation of high power light emitting diode (LED) needs the silicone resins to have relative high refractive index and thermal-aging properties. Herein, high refractive index adamantane-based phenyl epoxy-silicone (APES) resins for LED encapsulation were synthesized by the sol-gel condensation of 1-adamantane methanol propyltrimethoxysilane-3-urethane, γ-(2,3-epoxypropoxy)propytrimethoxysilane and diphenylsilanediol. These adamantane-based silicone resins have multifunctional groups including adamantyl group, phenyl group, and epoxy group in order to meet the various requirements for LED encapsulation. Importantly, the adamantane group in the silicone resins benefits for high refractive index and anti-thermal properties. These APES resins were characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. When APES resins were cured by methylhexahydrophthalic anhydride, they showed relatively high refractive index of 1.56, high hardness, and high thermal resistance. The encapsulated LED demonstrated high adhesion properties by red-ink tests. These merits make adamantane-based silicone resins promising candidates as LED encapsulation materials.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 5
·1360-1371
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IF 2.137
Lei Zheng,Hui Wang,Xiaomin Cheng
In this study, a series of imprinted poly(methacrylic acid- co -ethylene glycol dimethacrylate) nanocarriers for diclofenac and corresponding nonimprinted polymer nanocarriers have been synthesized in 4 different types of solvents by precipitation polymerization. The products were characterized by Fourier transform infrared, scanning electron microscopy, dynamic light scattering, and Brunauer-Emmett-Teller measurement. Results showed that uniformly sized molecularly imprinted polymer (MIP) nanospheres with relatively good porosity could only be obtained in acetonitrile. The effects of solvents on the recognition and release properties of polymer particles were also carefully investigated. The binding experiments indicated that MIPs prepared in acetonitrile displayed much higher binding capacity than other MIPs with a maximum binding capacity of 65.18 mg g −1 . The Scatchard analysis showed that synthetic MIPs have special recognition sites for diclofenac, while nonimprinted polymers have not. The Sips model could provide a best fit to the equilibrium data of nanocarriers over whole concentrations. The experimental data of an adsorption kinetic study were well fitted to the pseudo–second-order kinetic model, indicating the chemisorption mechanism between diclofenac and MIPs in the process of adsorption. The drug release of diclofenac from MIPs could well be described by the Ritger-Peppas model, suggesting a non-Fickian diffusion mechanism. In addition, we successfully used MIPs to extract diclofenac at low levels from fetal bovine serum.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 11
·2724-2734
·
IF 2.137
Wei Liu,Xiaolian Zhu,Xinlin Yang,Ke Li,Zupeng Yang
An effective polymerization system was developed for the synthesis of highly cross-linked hydrophilic monodispersed microspheres with both the micropores and mesopores inside. A series of poly( N , N ′-methylenebisacrylamide) (PMBA) microspheres with the diameters ranging from 100 to 300 nm were synthesized by distillation precipitation polymerization with N , N -dimethylacetamide (DMAC) as the porogen, acetonitrile as the solvent, and MBA as the cross-linker and monomer. The particle size, morphology, and porosity varied according to the variation of the DMAC content. The porosity was determined by physical adsorption of nitrogen, and reached the maximum at 7.5 vol% of DMAC with the specific surface area at 135.8 m 2 g −1 and the total pore volume at 0.43 cm 3 g −1 . The porous and hydrophilic microspheres showed excellent swelling property in water and adsorption property for the Cd(II) in aqueous solution. Meanwhile, carboxylic groups were incorporated into the porous microspheres to achieve porous poly( N , N ′-methylenebisacrylamide- co -acrylic acid) (P (MBA- co -AA)-P), which exhibited obvious synergies of the pores and functional groups on the adsorption and provided a perspective application of the Cd(II) removal.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2665-2673
·
IF 2.137
Xiaodong Guo,Xin Wang,Xiongrui Liu,Yanyang Zheng,Jianzhong Xu,Haiyun Ma
A phosphazene derivative flame retardant with a highly cross-linked microsphere structure, named poly(cyclotriphosphazene-c-sulfonyldiphenol) (PCPS) microspheres, were synthesized by 1-pot reaction and then applied on flame retarded epoxy (EP) resin. The microstructure and chemical composition of PCPS microspheres were characterized using scanning electron microscopy, transmission electron microscopy, and element mapping. The thermal stability of PCPS microspheres and PCPS/EP composites was explored through thermogravimetric analysis. Thermogravimetric data showed that the PCPS microspheres have excellent thermal stability, and the char yield is about 43% at the end of 800°C. The incorporation of PCPS microspheres significantly increased the char yield of PCPS/EP composites. The flammability was investigated by limited oxygen index tests and cone calorimeter. The limited oxygen index value of PCPS/EP composite was increased to 29.8 from 26.6 when 3 wt% of PCPS microspheres was added. Compared with neat EP, the flame retardancy was greatly improved. The peak heat release rate and smoke production rate of PCPS/EP composites were reduced by 45.0% and 43.6%, respectively. The mechanical properties including tensile strength and modulus were both improved due to the enhancement of PCPS microspheres. The PCPS microspheres act as a dual function for improving both the flame resistance and mechanical strength of PCPS/EP system.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 7
·1922-1929
·
IF 2.137
Yuanyuan Song,Lishuai Zong,Feng Bao,Guiyang Li,Zuoqiang Wu,Nan Li,Jinyan Wang,Xigao Jian
The effects of inorganic particles such as Al 2 O 3 and B 4 C on the solidification kinetics and heat resistance of phthalonitrile resin were investigated. The properties of the blends and the cured products were tested by rheometer, differential scanning calorimetry, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The results revealed that B 4 C and Al 2 O 3 inorganic particles could prolong the gel time of phthalonitrile resin and broaden the processing window. The curing kinetic analysis showed that the presence of the particles could significantly reduce the curing activation energy of phthalonitrile resins by 72.38 kJ/mol down to 43.03 kJ/mol. Meanwhile, the heat resistance of the phthalonitrile resin was improved. Among them, the blend system combined with 30% B 4 C showed prominent thermoresistance. And while the T d5% weight loss temperature was 600°C, char yield at 1000°C was higher than 86% under nitrogen atmosphere; while the T d5% weight loss temperature was 581°C, char yield at 1000°C was higher than 80% under air atmosphere. Hence, the resulting resins were good candidate matrix of high-temperature structural composites.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 7
·2147-2160
·
IF 2.137
Ping Zhu,Zhongji Gu,Shu Hong,Hailan Lian
Layered double hydroxides (LDHs) are emerging as a new and green high-efficient flame retardant. But LDHs aggregate seriously because of their hydrophilicity, which affect deeply the mechanical and flame retardant properties of their composites. For the first time in this paper, microencapsulated LDHs (MCLDHs) with melamine-formaldehyde (MF) resin were prepared by microencapsulation technology to enhance their compatibility and dispersion within epoxy resin (EP). The mechanical and flame retardant performances of EP/MCLDH composite were studied by comparing with EP/LDH composite. Results showed that the water contact angle of MCLDHs increased from 8.9° to 122.1°, which indicated good compatibility. The particle size of MCLDHs decreased sharply, and more than one-third were up to submicron scale, which can be conducive to dispersion. Moreover, the tensile strength and elongation at break of EP/MCLDHs with different flame retardant contents were higher than those of EP/LDHs. And the addition of MCLDHs increased the glass transition temperature (Tg) of EP/MCLDHs, which meant a strong interfacial interaction. Besides, compared with EP/LDHs, the limiting oxygen index values of EP/MCLDHs were higher, and its peak of heat release rate and total heat release decreased by 16.3% and 5.5% respectively. EP/MCLDHs achieved from V-1 to V-0 rate with the increasing content of MCLDHs from 20% to 30%, while LDHs/EP never passed tests. In the process of heating, H 2 O, CO 2 , and NH 3 released from MCLDHs formed gaseous phase, and the remaining dense char layers and oxides produced condensed phase, which played an important role in inhibiting combustion.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 1
·101-109
·
IF 2.137
Zongxue Yu,Xia Min,Fei Li,Di Yin,Yixing Peng,Guangyong Zeng
In this study, a novel dopamine modified graphene-based photocatalytic membrane with Bi 12 O 17 Cl 2 inserted was fabricated to modify the commercial cellulose acetate membrane via vacuum filtration method. Results showed the reduced graphene oxide (RGO)/poly(dopamine) (PDA)/Bi 12 O 17 Cl 2 -CA photocatalytic composite membrane exhibited 98% removal efficiency for methylene blue (MB) within 100 minutes and 96% removal efficiency for 4-CP within 160 minutes. Importantly, the photocatalytic composite membrane can simultaneously achieve dye degradation and oil-water separation in only one device within a short time. And the as-prepared membrane displayed great antifouling performance and recyclability after 10 cycles. Meanwhile, the membrane showed excellent stability in the agitated water bath or different pH conditions. In summary, the photocatalytic membrane investigated in this study opens new avenue for treatment of wastewater.
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高影响因子
危险品化学品经营许可证（带存储）