POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 8
·2245-2252
·
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.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 9
·2545-2552
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IF 2.137
Wei Cai,Xiaowei Mu,Ying Pan,Wenwen Guo,Junling Wang,Bihe Yuan,Xiaming Feng,Qilong Tai,Yuan Hu
Although hexagonal boron nitride (h-BN) has presented a potential prospect in polymer composite fields, undesirable interfacial interaction with polymer matrix that generates serious aggregation of nanomaterials has suppressed its enhancement effect. Moreover, the chemically inert surface of h-BN also makes the commonly used approach that improves the interfacial interaction between nanofillers and polymeric matrix invalid. Herein, the functionalized modification of chemically inert h-BN was successfully fabricated by the adsorption of cetyl-trimethylammonium bromide, with electrostatic interactions. The obtained h-BN (cetyl-trimethylammonium bromide-BN) was well characterized by systematic tests and then added into thermoplastic polyurethane (TPU) matrix. The inclusion of functionalized h-BN can dramatically improve thermal stability, flame retardant, and mechanical properties of TPU composites. With the incorporation of as low as 4.0 wt% nanofillers, maximal value of heat release rate and total heat release of TPU were reduced by 57.5% and 17.8%, compared with those of pure TPU, respectively. Moreover, tensile strength of TPU composite with a loading of 2.0 wt% was increased by 79.3% in comparison with that of neat TPU. The facile functionalized approach of chemically inert h-BN paves the way for promising applications of h-BN in the development of flame retardant polymer materials.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2574-2582
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IF 2.137
Xi Chen,Jun Wang,Siqi Huo,Shuang Yang,Bin Zhang,Haopeng Cai
Ternary flame-retardant modified cyanate ester blends (CEPG and CEPA) are formed by combining triazine compounds (TGIC or TAIC) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with cyanate ester resin. The curing behaviors, thermal and mechanical properties, and the flame-retardant properties are investigated. The results show that the CEPG and CEPA blends result in lower curing temperatures and glass transition temperatures than those of neat CE. Both of CEPG and CEPA blends significantly improve the flame-retardant properties of CE resins, and UL-94V-0 rate is achieved for CEPG-1.0 and CEPA-0.5. The dielectric constant and loss of CEPA blends are lower than those of CEPG blend with the same phosphors content, and both of them are lower than those of neat CE. Therefore, the ternary flame-retardant modified cyanate ester blends provide 2 ways for composites of producing printed circuit board with high flame-retardant property and low dielectric constant and loss.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2665-2673
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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.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 11
·2724-2734
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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.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2674-2682
·
IF 2.137
Yanping Wu,Jia Dong,Rui Yuan,Hongqi Wan,Lei Chen,Jinlong Li,Huidi Zhou,Jianmin Chen
Solution styrene butadiene and butadiene rubber (SSBR-BR) composites reinforced with different contents of SiO 2 -graphene have been fabricated firstly. The mechanical properties of the rubber composites were comparatively investigated using tensile tests; experimental results showed that, as an overall trend, the tensile and tear strength increased with increasing contents of SiO 2 -graphene. Most importantly, under the condition of simulating practical working condition, the tribological behavior of SSBR-BR composites with different contents of SiO 2 -graphene was explored via a universal ring-plate frictional tester in detail. Combined with the surface roughness of the counterparts, the wear mechanisms were discussed for SSBR-BR composites under the cement and asphalt counterparts. Finally, several wear mechanisms under different actual working conditions were proposed.
研究领域:
材料科学
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摩擦学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 11
·2797-2805
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IF 2.137
Hanyuan Li,Wei Wang,Guofei Chen,Xiaoqi Chen,Yantao Li,Haijun Zhou,Xingzhong Fang
Novel highly soluble phenylethynyl-endcapped oligoimides with different calculated molecular weights were prepared by using mellophanic dianhydride and bis(4-amino-2-trifluoromethylphenyl)ether in the presence of 4-phenylethynyl phthalic anhydride as the reactive endcapping agent. The effect of molecular weights of the aromatic oligoimides on their solubility and processability as well as the thermal and mechanical properties of the thermal-cured polyimides was fully investigated. This kind of phenylethynyl-terminated imides exhibited excellent comprehensive properties. Most importantly, a big progress has been made in the solubility of the oligoimides in this paper. Most of the oligoimides showed excellent solubility (more than 33 wt%) even in acetone , which was reported for the first time. And oligoimides with appropriate molecular weights also showed very good processability with minimum melt viscosities no higher than 120 Pa·s by the rheological study. After thermally curing at 370°C for 1 hour, the cured flexible films showed very high glass transition temperatures up to 392°C by dynamic mechanical analysis, and the temperature of 5% weight loss was higher than 500°C in both air and N 2 atmosphere by thermogravimetric analysis. The cured films also exhibited very good toughness with elongation up to 9%.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 11
·2838-2847
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IF 2.137
Shuchen Shi,Dongyi Li,Chunxiao Chai,Yufeng Wu,Ying Xu
A novel modified polyaspartic acid polymer, polyaspartic acid/4-(2-aminoethyl) morpholine graft copolymer (PASP/AEM), was prepared through a ring-opening reaction of polysuccinimide and 4-(2-aminoethyl) morpholine and characterized by 1 H NMR. The scale inhibition performance of this copolymer and its ability to disperse Fe 2 O 3 were investigated in static tests. Scanning electron microscopy and X-ray powder diffraction were used to analyze the effects of PASP/AEM on scale formation. The performance and mechanism of corrosion inhibition by the synthesized copolymer were studied via weight loss measurements and electrochemical measurements. The results showed that PASP/AEM possessed outstanding scale and corrosion inhibition efficiencies and had potential for use as a green scale and pickling inhibitor.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2026
·Vol. 37
·期 9
·e70737
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IF 3.8
Yuxiong Yi,Xiaomin Cheng,Xuyuan Tang,Zhou Wu,Yuanyuan Li
Phase-change materials offer high-density latent heat storage and dynamic temperature regulation, but integrating thermal buffering with solar-heating suppression and radiative heat dissipation in mechanically robust films remains challenging. Here, a multifunctional phase-change composite film was fabricated by incorporating SiO 2 -encapsulated n-octadecane microcapsules (MPCM) and TiO 2 nanoparticles into a Ca 2 ⁺-crosslinked PVA/SA/CMC (PSC) matrix. The core–shell MPCMs provided latent heat storage and additional scattering interfaces, whereas TiO 2 enhanced solar reflection. The resulting PSC/MPCM/TiO 2 film exhibited a rough multiphase morphology and a tensile strength of ~12.8 MPa. It delivered melting and crystallization enthalpies of 60.14 and 61.06 J g −1 , respectively, and maintained stable phase-transition behavior over 200 heating–cooling cycles. The film achieved a solar-weighted reflectance of 77.78% and a long-wave infrared (LWIR)-weighted emissivity of 97.70% within the 8–13 μm atmospheric window. Under 1000 W m −2 simulated solar irradiation, its back-surface steady-state temperature was ~13°C–14°C lower than that of a directly irradiated bare-thermocouple reference under the employed test configuration. Transient heating–cooling tests showed that MPCM melting and crystallization delayed temperature rise and moderated temperature fluctuations, while outdoor day–night measurements confirmed reduced heat accumulation and smoother thermal responses. A steady-state energy-balance model further predicted a net radiative cooling power of ~62 W m −2 at ambient temperature under 600 W m −2 solar irradiation. These results demonstrate the complementary roles of solar reflection, long-wave infrared emission, and latent heat storage in passive heat rejection and dynamic thermal buffering, highlighting the potential of this composite film for building-envelope thermal management.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2012
·Vol. 24
·期 2
·197-203
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IF 2.007
Yan Liu,Yan Zhang,Zhenhu Cao,Mao Peng,Zhengping Fang
Novel oligomeric intumescent flame retardants, poly(amino phosphonate ester)s (PAPEs), containing both phosphorous and nitrogen, were synthesized by reacting diethyl phosphite with two different polyschiff bases obtained from the reaction of diamines with dialdehyde. The target PAPEs (designated as PAPE-d and PAPE-e, respectively) were characterized by 1 H NMR, 31 P NMR, Fourier Transform infrared spectroscopy, elemental analysis, gel permeation chromatography and thermogravimetric analysis (TGA) techniques. Thermal stability and flammability of ethylene-vinyl acetate copolymer (EVA)/PAPE blends with various PAPE content were investigated by TGA, limited oxygen index (LOI), vertical burning test (UL-94) and microscale combustion colorimeter (MCC). The results indicate that PAPEs effectively improve the flame retardancy of EVA. The EVA/30%PAPE-e blend has a LOI value of 28, and its peak heat release rate (PHRR) value in MCC measurement is reduced by 36%. At the same time, the EVA/PAPE blends also have high yield of residual char, indicating that PAPEs are effective charring agents. Scanning electron microscopy observations of the residues of the EVA/PAPE blends show the existence of compact char layer on the surface of the residues, which is responsible for the improvement of the flame retardancy of EVA. Copyright © 2012 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2013
·Vol. 24
·期 6
·600-608
·
IF 1.635
Zhenxun Huang,Jianqing Zhao,Yanchao Yuan,Shijing Yan,Shumei Liu,Xingtao Zan
In this study, amino derivative of pure silica zeolite nanocrystal (A-PSZN) was dispersed into polyimide (PI) matrix to prepare PI/A-PSZN hybrid films, and their thermal and mechanical properties, as well as hydrophobicity, were characterized scientifically. The test results show that PI/A-PSZN hybrid films possess higher glass transition temperature, higher thermal stability and lower in-plane coefficient of thermal expansion than pristine PI. The mechanical property data suggest that the incorporation of A-PSZN results in an increase in Young's modulus and tensile strength of the hybrid films, but as its content exceeds the critical value (maybe 5 wt%), its enhancement effect on the hybrid's strength and toughness gets weaker. Furthermore, liquid dripping imaging analysis results indicate that the film's hydrophobicity is clearly improved by the introduction of A-PSZN. As compared with PSZN, A-PSZN exhibits better effect on enhancing the overall performance of pristine PI films. A comparison with other studies suggests that PI/A-PSZN is a hybrid film with superior comprehensive properties. Copyright © 2013 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 12
·3159-3170
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IF 2.137
Kai Huang,Xiao Quan,Xipeng Li,F. Handan Tezel,Baoan Li
Organic fouling has been a major impediment for the widespread application of nanofiltration membranes because it could degrade the performance and shorten the service life of such membranes. In this study, the NH 2 -functionalized silica nanoparticles (NH 2 –SiO 2 NPs) were grafted on the surface of commercial NF90 membrane to improve the hydrophilicity and antifouling property with the N -(3-dimethylaminopropyl)- N -ethylcarbodiimide hydrochloride coupled with the N -hydroxysuccinimide (EDC/NHS) to activate carboxyl groups on the membrane surface. The surface roughness (Ra) of this modified membrane decreased from value of 47.4 nm of the pristine membrane to 43 nm. The water contact angle of the modified membrane decreased from 48.4° to 15°, indicating the high hydrophilicity of the surface. Moreover, the EDC/NHS membrane showed good stability when it was exposed to the ruinous physical stress (2-min sonication). The optimized grafting conditions, including the SiO 2 concentration (0.5 wt%), the activation time of EDC/NHS (20 min), and the reaction time of NH 2 –SiO 2 NPs with membrane surface (12 h), were obtained by a series of experiments. Under the antifouling test of 36 hours with bovine serum albumin (BSA) and hexadecyltrimethylammonium bromide (CTAB) as foulants, the EDC/NHS membrane lost 42.1% and 49.6% of its initial flux, respectively, which is lower than that of the pristine membrane (52.2% and 68%, respectively). After cleaning with deionized water for 2 hours, the EDC/NHS membrane also showed significant improvement of flux recovery ratio (92% and 87%, respectively) than did the pristine membrane (70.3% and 60%, respectively).
研究领域:
环境工程
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膜科学
·
水处理
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DOI
高影响因子
危险品化学品经营许可证（带存储）