POLYMER INTERNATIONAL
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2016
·Vol. 66
·期 1
·92-97
·
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
·
纳米技术
·
生物医学工程
·
细胞生物学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 66
·期 1
·98-107
·
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
·
纳米技术
·
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
·
生物医学工程
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
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
·
2017
·Vol. 66
·期 6
·876-881
·
IF 2.07
Zuoqiang Wu,Jianhua Han,Nan Li,Zhihuan Weng,Jinyan Wang,Xigao Jian
High curing temperature (including post-curing temperature) and long curing time of phthalonitrile resins make them thermally stable but difficult to process. In this paper, novel mixed curing agents (CuCl/4,4′-diaminodiphenylsulfone (DDS) and ZnCl 2 /DDS) were firstly designed for solving these problems. Bisphenol-based phthalonitrile monomer (BP-Ph; melting point: 228–235 °C) was synthesized and used as the curing precursor. Differential scanning calorimetry results indicated that BP-Ph cured with CuCl/DDS and ZnCl 2 /DDS exhibited curing temperatures close to the melting point of BP-Ph with curing ending temperatures of 225.4 and 287.1 °C, respectively. Rheologic investigations demonstrated obvious curing reactions of BP-Ph occurred with the mixed curing agents at 220 °C. Thermogravimetric analysis showed that BP-Ph cured by CuCl/DDS or ZnCl 2 /DDS maintained 95% mass at 573 or 546 °C, respectively, at a post-curing temperature of 350 °C for 2 h. Reasonable long-term thermo-oxidative stability was also demonstrated. When the post-curing temperature decreased to 290 °C, char yield at 800 °C of BP-Ph cured by CuCl/DDS was 77.0%, suggesting the curing procedure can be milder when using mixed curing agents. © 2017 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
·
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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DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 9
·1282-1290
·
IF 2.352
Xiao Yang,Lian Duan,Xiaoqi Ran
A donor–acceptor conjugated-type polymer, poly(thiophene-1,3,4-oxadiazole) (PThOD), was synthesized by one-step polycondensation in polyphosphoric acid. PThOD was confirmed and characterized using Fourier transform infrared spectra, thermogravimetric analysis, X-ray diffraction and UV-visible spectra. The UV-visible spectra showed that PThOD could absorb not only in the whole ultraviolet range from 200 to 400 nm but also in the visible light range up to 500 nm. Considering the conjugated structure of PThOD, studies were carried out of its performance for the photocatalytic degradation of various dyes, such as methyl orange, methylene blue, rhodamine B and reactive brilliant blue (RBB), under medium-pressure Hg light source irradiation. The results showed that PThOD was an effective photocatalyst, which could degrade the four types of dye solution. Besides, visible light was also used to investigate the degradation of RBB, and the results showed that RBB could be degraded as well, though the efficiency was not as high as using the Hg lamp. The superoxide anion radical (O 2 •− ), which is one of the reactive oxide species, was detected using the nitrotetrazolium blue chloride method and considered to play a key role in photodegradation of dyes. Moreover, various scavengers were also used to further prove the function of − . Furthermore, it was found that degradation rate could be changed by adding H + , which might be attributed to a change of adsorption capacity of PThOD. Finally, the reusability of PThOD as photocatalyst was investigated. The results indicated that the reusability efficiency of PThOD was excellent even after ten continuous rounds of use. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
环境科学
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高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 10
·1673-1680
·
IF 2.433
Jiahui Su,Yan Yang,Zhikang Chen,Junyi Zhou,Xiaoxuan Liu,Yanxiong Fang,Yanyan Cui
In this study, frontal photopolymerization was applied to the fabrication of thermosensitive poly( N -isopropylacrylamide) (PNIPAm) hydrogels. The influence of experimental conditions and reactant components on the feature of the polymerization front was investigated. The morphology of the samples indicated the successful preparation of PNIPAm hydrogels. The mechanical properties and thermal stability of the obtained hydrogels are discussed. The results indicated that the performance of the hydrogels is related to their microstructure and the type of crosslinkers. The swelling behavior and drug delivery ability were determined under different temperature conditions. The hydrogels exhibit a classical thermoresponsive behavior, which was also demonstrated by the DSC results. Therefore, frontal photopolymerization can be an alternative method for the preparation of PNIPAm hydrogels under mild conditions. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 10
·1729-1738
·
IF 2.433
Xinghua Guan,Heran Nie,Honghua Wang,Jiyong Zhao,Zhipeng Wang,Guangyuan Zhou,Qiang Gu
A series of copolyarylates (PP0–PP100) containing phthalide groups was synthesized via interfacial polymerization from a mixture of phenolphthalein (PP) and bisphenol A with molar equivalent of terephthalyl chloride. Incorporating PP into the polymer chain improved the solubility of the polyarylates in common organic solvents. The glass transition temperature (191–314 °C), residual weight percentage, Young's modulus (1.7–2.8 GPa), solubility and complex melt viscosity of the copolyarylates increased with increasing PP units in the copolymerization. By contrast, crystallinity and elongation at break (14.1 to 11.2%) of the copolyarylates decreased with increasing PP units in the polymer backbone. When the PP content increased over 30 mol% (PP30), the copolyarylates became amorphous polymers. When the PP content was below 30 mol%, the copolyarylates exhibited good melt processability. With regards to its solubility, thermal stability, mechanical properties and melt processability, PP30 may be considered as a promising candidate in the field of processable high-performance engineering plastics. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 10
·1739-1747
·
IF 2.433
Weining Du,Zetian Zhang,Zhengjun Li
Asymmetric bilayer membranes have been regarded as ideal wound dressings for skin regeneration. Our previous work reported the potential advantages of polydimethylsiloxane modified gelatin/silicone rubber (PGE/SR) asymmetric bilayer membrane as a wound dressing. However, it is still unknown whether the proportion of the two components of the bilayer membrane has a prominent influence on its relevant performance. Herein, various PGE/SR membranes with different PGE:SR weight ratios (100:25, 100:50 and 100:100) were fabricated through a self-stratification method driven by surface tension gradients. Subsequently, the effects of the PGE:SR ratios on the relevant performance (i.e. porous structure, mechanical properties, degradability and biocompatibility) of PGE/SR membranes were systematically investigated. The current results demonstrate that the separating force between the PGE and SR components was reduced significantly on increasing the content of SR, and in particular the PGE/SR1 membrane (100:25) exhibited a well-defined asymmetric bilayer structure with high porosity, appropriate toughness, water uptake, swelling ratio and water permeability. Concomitantly, the maximum weight loss for the PGE/SR1 membrane was ca 70.65% after 9 days of enzymatic degradation, which met the typical healing period of a normal skin wound. In addition, both the original and degraded PGE/SR1 membrane possessed favorable cytocompatibility in vitro , suggesting its potential application as a wound dressing. © 2019 Society of Chemical Industry
研究领域:
生物材料学
·
组织工程学
·
医学材料
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DOI
高影响因子
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