POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 6
·804-810
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IF 2.247
Jiming Yang,Ning Zhang,Haolong Li,Bin Xu,Wenjing Tian,Dewen Dong
A facile and efficient strategy for the preparation of polymer grafts on zirconia particles is developed by means of self-initiated photografting and photopolymerization. The UV-induced grafting polymerization is applicable to a variety of polymerizable monomers, allowing the direct formation of homogeneous and stable polymer coatings on zirconia particles without any initiator immobilization. The as-prepared polymer grafts are proved to be efficient supports for polyoxometalates as H 3 PW 12 O 40 can be uniformly and stably immobilized on a poly(4-vinylpyridine) layer through electrostatic interaction. The resulting hybrid catalyst system, associated with high catalytic activity for a series of oxidation reactions such as amines, alkenes, alcohols and sulfides, represents a novel and efficient system with a high catalyst loading capacity and stability upon reuse in further cycles. © 2014 Society of Chemical Industry
研究领域:
材料科学
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催化化学
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高影响因子
POLYMER INTERNATIONAL
·
2015
·Vol. 64
·期 8
·979-985
·
IF 2.409
Lijuan He,Zongbo Zhang,Xiaogan Yang,Lingling Jiao,Yongming Li,Caihong Xu
A series of liquid polycarbosilanes were successfully synthesized by a sequential Grignard coupling reaction of (chloromethyl)triethoxysilane and vinylmagnesium bromide, followed by reduction with lithium aluminium hydride. The use of non-corrosive, easily handleable and storage stable (chloromethyl)triethoxysilane as starting material is an attractive advantage for this route. The as-synthesized polymers containing Si−CH=CH 2 and Si − H groups are storage stable and can be easily cured in an inert atmosphere. The ceramic yield of the cured polycarbosilane and the C:Si ratio of the derived ceramic were varied by adjusting the mole ratio of starting materials in the feed. Among them, the polymer with a mole ratio of Si−CH=CH 2 to Si − H of 1:10 has the highest ceramic yield at 89.6% after curing at 220 °C and the C:Si ratio of the derived ceramic is 1.48. This kind of polycarbosilane shows high potential as an SiC ceramic precursor in the fabrication of an SiC matrix by the precursor infiltration pyrolysis process. © 2015 Society of Chemical Industry
研究领域:
材料科学
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化学工程
·
无机化学
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 10
·1238-1244
·
IF 2.414
Saiqi Tian,Jiating Wen,Haojun Fan,Yi Chen,Jun Yan,Peikun Zhang
An amino-terminated long persistent luminescent phosphor (Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) was prepared based on inorganic SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor, chemically modified with 3-aminopropyltriethoxysilane (KH550). Fourier transform infrared and X-ray photoelectron spectral, thermogravimetric and scanning electron microscopic measurements confirmed the successful synthesis of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ . Then this amino-functionalized phosphor was introduced into polyurethane (PU) through urea linkages, and the effects of the chemical combination of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ and PU on the morphology, structure, storage stability, and mechanical, thermal and luminescent properties of the resultant long persistent luminescent polyurethane (LPLPU) were investigated. Compared with SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU composites prepared by physical blending, the LPLPU shows better mechanical properties and storage stability due to the good compatibility of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ with PU. More residues and higher initial decomposition temperature are observed because the interaction of the amino-phosphor and PU delays the degradation. Study of the luminescent effect reveals that the LPLPU shows more than 10 h afterglow after cessation of the excitation light, and the brightness of green light in darkness is basically the same as that of LPLPU and SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU. © 2016 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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高影响因子
POLYMER INTERNATIONAL
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2016
·Vol. 66
·期 1
·92-97
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IF 2.414
Junzhi Li,Jianhua Liu,Liqun Xu,Jiucun Chen
Nowadays, carbon dots (CDs) have aroused widespread interest due to their chemical stability, biocompatibility as well as low toxicity. Herein, polymerizable CD monomers were synthesized through amidation between hydrophobic CDs and methacryloyl chloride, which has emerged as a facile method for preparing various fluorescent CD monomers. The fluorescent polymerizable CDs were copolymerized with N- isopropylacrylamide (NIPAM) to form thermoresponsive fluorescent nanoparticles. The poly(NIPAM) (PNIPAM) grafted hydrophobic CDs (CDs- g -PNIPAM) have excellent dispersivity in water, rendering hydrophobic CDs with fluorescence properties in aqueous media. Moreover, CDs- g -PNIPAM nanocomposites show a remarkable thermoresponsive behavior, and the fluorescence intensity decreases progressively with increase in temperature. Cytotoxicity tests show that CDs- g -PNIPAM nanocomposites have great biocompatibility. When the CDs- g -PNIPAM nanocomposites were cultured with HaCaT cells at a concentration of 2000 µg mL −1 , cell viability was maintained over 85%. Benefiting from the copolymerization of NIPAM, the excitation-independent fluorescence of CDs- g -PNIPAM nanocomposites can be used for cellular labeling and show long-term biostability in a cellular environment. © 2016 Society of Chemical Industry
研究领域:
材料科学
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纳米技术
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生物医学工程
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细胞生物学
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高影响因子
POLYMER INTERNATIONAL
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2016
·Vol. 66
·期 1
·98-107
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IF 2.414
Fubin Luo,Kun Wu,Huilong Guo,Qiang Zhao,Mangeng Lu
Graphene oxide
(GO) is reduced and surface functionalized by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide simultaneously. This functional reduced graphene oxide (F-rGO) with better thermal stability can be used as a nano-filler to improve the flame retardancy, mechanical properties and thermal conductivity of mesogenic epoxy (EO). Due to the presence of an oriented structure, EO is an intrinsic highly thermal conductive polymer compared with common polymer. After being filled with F-rGO, the ordered domains in the EO matrix are connected by F-rGO. As a result, the thermal conductivity coefficient of F-rGO/EO composite is increased by 30.8% compared with pure EO. The dynamic mechanical analysis results indicate that E ' of F-rGO/EO is 26.7% higher than that of EO. Because of the stable structure of F-rGO, F-rGO/EO is self-extinguishing. The total heat release of F-rGO/EO-15 is 24.1 kJ g −1 , which is 5.6 kJ g −1 lower than that of EO. © 2016 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 66
·期 3
·443-449
·
IF 2.414
Xiaoying Li,Xiaoan Nie,Jie Chen,Yigang Wang
A new type of plasticizer, epoxidized cardanol butyl ether (ECBE), was synthesized via etherification and epoxidation. Successful synthesis was confirmed from Fourier transform infrared, 1 H NMR and 13 C NMR spectra. The obtained product was evaluated by adding it to poly(vinyl chloride) (PVC) incorporated with dioctyl phthalate (DOP). Mechanical and thermal properties of PVC blends were studied using tensile testing, thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Processability, migration and volatility of plasticizing systems were also investigated. Tensile tests found a maximum increase of 17.8% in elongation at break. DMA results indicated that glass transition temperature shifted to lower temperature with a maximum decrease of 5.76 °C. TGA results revealed that PVC blends with higher content of ECBE had higher thermal stability; initial degradation temperature, 50% weight loss temperature and the first peak degradation temperature increased by 15.3, 14.8 and 4.1 °C, respectively. Processing time was extended from 11.56 to 59.94 min. The plasticizing performance of migration and volatility resistance were higher than those of neat DOP. © 2016 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 66
·期 5
·659-664
·
IF 2.414
Jia Chen,Bin Chen,Jingyu Li,Xin Tong,Haichao Zhao,Liping Wang
Hexagonal boron nitride (hBN), a two-dimensional nanofiller with good mechanical properties, high thermal conductivity and excellent lubrication properties, has the potential to substantially reinforce polymers to form nanocomposites with advanced properties. In this study, we successfully prepared hBN nanosheets with a thickness of a few atoms by using amine-capped aniline trimer (AT) as dispersant. Epoxy/hBN nanocomposites were prepared by curing reaction of epoxy E51, Jeffamine D230 and AT-modified hBN nanosheets, where the hBN contents were 0.5, 1, 2 and 4 wt%. An increase in contact angle of the epoxy/hBN nanocomposites was evident in the presence of hBN nanosheets, implying an increase in the hydrophobic nature of the composites. The as-prepared composites exhibited enhanced mechanical and tribological performance compared to pure epoxy resin. This effectiveness in improving the mechanical, friction and wear behavior of the epoxy composites could be attributed to the complementary action of excellent mechanical properties, lubrication and thermal conductivity of hBN nanofillers. © 2016 Society of Chemical Industry
研究领域:
材料科学
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纳米技术
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高分子科学
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高影响因子
POLYMER INTERNATIONAL
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2016
·Vol. 66
·期 5
·712-718
·
IF 2.414
Lin Liu,Yueting Pei,Chaoliang He,Li Chen
Multi-responsive hydrogels have recently received considerable attention for bioapplications. Here, novel temperature- and redox-responsive polypetide hydrogels have been developed. Thermo-sensitive hydrogels based on poly(ethyleneglycol)- block -poly(γ-propargyl- l -glutamate) (PEG-PPLG) were first synthesized by the ring opening polymerization of γ-propargyl- l -glutamate N -carboxyanhydride (PLG-NCA) with amino group terminated PEG monomethyl ether (mPEG-NH 2 ) as macroinitiator and were then functionalized via the ‘thiol-yne’ click reaction between the propargyl pendents and the thiol-containing 1-propanethiol. The sol − gel phase transition of the obtained copolymer aqueous solution in response to temperature change was studied. The mass loss of the hydrogel in vitro was accelerated in the presence of H 2 O 2 , exhibiting a redox-responsive property. Further, the methyl thiazolyl tetrazolium viability results revealed that this polypetide hydrogel has excellent biocompatibility, presenting potential applications in the biomedical field. © 2016 Society of Chemical Industry
研究领域:
材料科学
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生物医学工程
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化学工程
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高影响因子
POLYMER INTERNATIONAL
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2016
·Vol. 66
·期 6
·779-786
·
IF 2.414
Fubin Luo,Kun Wu,Hongyan Zhu,Xiaoya Li,Mangeng Lu
Two kinds of foam based on melamine − formaldehyde (MF) condensates (PVA/MF (PVA, polyvinyl alcohol), PVA/APTES/MF (APTES, 3-triethoxysilylpropylamine)) were prepared by chemical modification. Pure MF foam has the serious disadvantage that it is very hard and brittle, breaks easily and crumbles when handled. After modification, PVA/MF and PVA/APTES/MF display excellent resilience. The structures of the foams were characterized by Fourier transform infrared (FTIR), SEM and XRD. XRD data indicate that modifiers hinder the crystallization of MF, which might contribute to the improvement of resilience. Flame retardancy of the foams was characterized by limiting oxygen index testing, and the thermal degradation behavior was studied using TGA. The mode of flame retardant action is suggested by gaseous and solid phase analysis. TGA-FTIR results demonstrate that the sublimation of the melamine of MF and foams based on MF occurs during thermal decomposition, which contributes to the high flame retardancy. © 2016 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 8
·1128-1136
·
IF 2.352
Yuyao Tang,Fangqiao Zhao,Xiaoma Fei,Wei Wei,Xiaojie Li,Jing Luo,Ye Zhu,Xiaoya Liu
A branched random copolymer, poly[(hydroxyethyl acrylate)- r -( N -vinylcarbazole)] (BPHNV), was synthesized through a facile one-pot free radical polymerization with hydroxyethyl acrylate and N -vinylcarbazole monomers, using 4-vinylmethylmercaptan as the chain transfer agent. BPHNV was employed to noncovalently modify multiwall carbon nanotubes (MWCNTs) by π–π interaction. The as-modified MWCNTs were then incorporated into epoxy resin to improve the thermal conductivity and mechanical properties of epoxy thermosets. The results suggest that, due to both the conjugation structure and the epoxy-philic component, BPHNV could form a polymer layer on the wall of MWCNTs and inhibit entanglement, helping the uniform dispersion of MWCNTs in epoxy matrix. Owing to the unprecedented thermal conductivity of MWCNTs and the enhancement in the interfacial interaction between fillers and matrix, the thermal conductivity of epoxy/MWCNTs/BPHNV composites increases by 78% at extremely low filler loadings, while the electrical resistivity is still maintained on account of the insulating polymer layer. Meanwhile, the mechanical properties and glass transition temperature ( T g ) of the thermosets are elevated effectively, with no significant decrease occurring to the modulus. The addition of as little as 0.1 wt% of MWCNTs decorated with 1.0 wt% of BPHNV to an epoxy matrix affords a great increase of 130% in impact strength for the epoxy thermosets, as well as an increase of over 13 °C in T g . © 2018 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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复合材料
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热工程
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高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 9
·1221-1228
·
IF 2.352
Meng Ma,Kai Liu,Haiming Zheng,Si Chen,Bozhen Wu,Yanqin Shi,Xu Wang
Poly( l -lactic acid)/crosslinked polyurethane (PLLA/CPU) blends which were prepared via reactive blending of PLLA with poly( ϵ -caprolactone) (PCL), glycerol and 4,4′-methylenediphenyl diisocyanate showed excellent toughness. The effects of the composition of the mixture and degree of crosslinking of CPU on the toughness of the PLLA/CPU blends (80/20 w/w) were studied in detail. Dynamic mechanical analysis and rheological measurements were used to characterize the structure of the in situ formed CPU in the PLLA matrix. A novel netlike phase structure was observed when the average molecular weight of PCL and degree of crosslinking were 1 kDa and 10%, respectively. The impact strength of the blend was enhanced from 2.2 kJ m −2 for pure PLLA to 62.4 kJ m −2 ; meanwhile, the elongation at break was increased to 489.8%. Therefore, the mechanical properties of PLLA/CPU blends can be easily tailored by tuning the composition of the mixture and the degree of crosslinking of CPU. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 9
·1266-1274
·
IF 2.352
Shanshan Shen,Cuiyun Li,Huiyun Yang,Yanyu Zhang,Fengan Han,Fuxin Han,Yanfang Liu
Three benzoxazines based on o -allylphenol and 1,6-hexamethylenediamine (HDA) or 4,4′-diaminodiphenyl methane (DDM) or 4,4′-diaminodiphenyl ether (DDE) were respectively blended with diglycidyl ether of bisphenol-A (DGEBA) in various weight ratios followed by thermal polymerization to prepare three series of benzoxazine/DGEBA copolymers. With increasing DGEBA content, the peak temperature of the exothermic peaks in the DSC curves shows a systematic increase for the three series of benzoxazine/DGEBA blends. Each copolymer shows a single glass transition temperature ( T g ). As the content of DGEBA is increased, T g reaches a minimum for the copolymer system based on HDA but a maximum for the two systems based on DDM and DDE. For the same benzoxazine/DGEBA weight ratio, copolymers based on DDM and DDE show high T g values over those based on HDA. The three series of benzoxazine/DGEBA copolymers exhibit a one-way dual shape memory effect based on T g , and the shape memory properties of the copolymers under tensile deformation mode vary with the variation of both diamine bridge structure and DGEBA content. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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高影响因子
危险品化学品经营许可证（带存储）