POLYMER INTERNATIONAL
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2020
·Vol. 70
·期 2
·193-201
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IF 2.574
Xiaopeng Sun,Fanghong Yang,Zhanhai Yao
Aiming at utilizing the electron energy absorption characteristic of the benzene ring in polystyrene (PS) to enhance the electrical properties of insulation, here linear low density polyethylene grafted PS graft copolymers (LLDPE- g -PS) have been synthesized by pre-irradiation and suspension grafting technology. Then, LLDPE- g -PS was added in LLDPE to prepare LLDPE/LLDPE- g -PS blends, of which the microstructure and thermal, rheological, electrical and mechanical properties were systematically investigated. Scanning electron microscopy showed that no interfacial debonding occurred in the blends. Rheological measurements showed that the viscoelastic properties of the blends were roughly the same as those of LLDPE. In terms of electrical properties, as LLDPE- g -PS was added, the injection of space charges was markedly suppressed. Meanwhile, all blends presented higher DC breakdown strength and the maximum was 1.45 times higher than that of LLDPE. Besides, blends exhibited little change in mechanical properties compared with LLDPE when PS contents were lower than 10 wt%. This investigation proposes an efficient method to improve the electrical properties of insulating materials. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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电气工程
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高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 3
·282-287
·
IF 2.574
Jiaxin Wei,Yingshuang Shang,Da Xu,Zhaoyang Wang,Zilong Jiang,Yanwei Gao,Haibo Zhang
A series of novel poly(ether ketone) copolymers with different contents of fluorene groups were synthesized. The effects of fluorene group content on the thermal and mechanical properties of poly(ether ketone) copolymers were investigated. The introduction of a low content of fluorene groups can lead to an increase in glass transition temperature, thermal stability and heat deflection temperature. Among them, the heat deflection temperature of 10% fluorene-containing poly(ether ketone) copolymers (PEK-FD10) increases from 178 °C (pure poly(ether ketone)) to 196 °C, which means that the material has a higher heat resistance rating. Compared with poly(ether ketone)s, these copolymers have excellent mechanical properties. When the content of fluorene groups is only 2% (PEK-FD2), the strength is significantly improved. And the flexural strength of PEK-FD2 is 149.3 MPa, which is 12% higher than that of poly(ether ketone). It is worth noting that the fracture toughness and impact toughness are also increased significantly. The strain at break of PEK-FD2 is up to 88% and the impact toughness of PEK-FD2 is 54.6 J m −1 . This suggests that the introduction of minute contents of fluorene groups can simultaneously increase the strength and toughness. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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高分子化学
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高影响因子
POLYMER INTERNATIONAL
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2020
·Vol. 70
·期 2
·230-241
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IF 2.574
Xin Tong,Wei-Ming Peng,Mei-Ling Zhang,Xiao-Jun Wang,Gang Zhang,Sheng-Ru Long,Jie Yang
A new type of poly(ether-amide) thermoplastic elastomer (TPAE) was synthesized using poly(decamethylene terephthalamide (10T)/decamethylene isophthalamide) as hard segment and poly(ethylene glycol) as soft segment via an efficient, accessible and low-pollution melt polymerization method. Thermoplastic elastomer was synthesized based on semi-aromatic polyamide for the first time. The effects of various compositions of hard segments on the thermal and mechanical properties were investigated. The results show that TPAE synthesized from semi-aromatic polyamide has excellent thermal stability, the initial decomposition temperature of all samples being between 370 and 378 °C. With an increase of 10T content, crystallization ability of the hard segment increased. As 10T content increased, TPAE changed from amorphous to crystalline, and the melting temperature ranged from 175 to 236 °C. Tensile testing revealed that TPAE had excellent and adjustable mechanical properties, and that tensile strength, elongation at break and elasticity modulus were in the ranges 7–40 MPa, 468–835% and 0.036–1.80 MPa. Furthermore, high-temperature tensile test results showed that TPAE-4 still maintained considerable mechanical properties, and had better mechanical properties compared with Pebax® 5533. In particular, TPAE-4 had higher performance decay point for which elasticity modulus and stress at ε = 500% decreased rapidly when the temperature was higher than 80 °C, this point for Pebax® 5533 appearing at 50 °C. Such outstanding performance indicated that this new class of elastomer has the potential to be used in high-temperature conditions. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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高分子化学
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高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 5
·612-618
·
IF 2.574
Yi Xu,Nan Yang,Yujia Liu,Zhengbai Li,Qiang He,Chao Li
5-Aminoindole is designed for aldehyde-functional benzoxazine (PHB-a) copolymerization due to the special reaction between the indole and aldehyde groups, and the copolymerization with benzoxazine monomers. The curing and mechanical behavior and thermal properties of the cured resins are investigated using Fourier transform infrared spectroscopy, 1 H NMR spectroscopy, differential scanning calorimetry, scanning electron microscopy, dynamic mechanical analysis, tensile tests and thermogravimetric analysis. The resulting networks show better processability and mechanical properties without obvious degradation in thermal performance. The low curing temperature (70 °C) of PHB-a is achieved after incorporation of 5-aminoindole. An elongation rate of 2.54% and a forcing break of around 72.3 MPa are achieved, while neat poly(PHB-a) is brittle and failed in the grips. Furthermore, its glass transition temperature is maintained up to 234 °C. These findings open a new way to realize low-temperature curing and to improve the mechanical properties of brittle polybenzoxazine resins under the premise of maintaining good thermal stability. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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高分子化学
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高影响因子
POLYMER INTERNATIONAL
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2020
·Vol. 70
·期 1
·90-95
·
IF 2.574
Huan Bi,Fangyu Liu,Mian Wang,Zhu Mao,Yuehui Zhai,Wei Li,Shiwei Wang,Mingyao Zhang
Recently, organometallic halide perovskites have shown attractive application prospects in photoelectric devices depending on their excellent electro-optic properties. However, their poor stability has greatly limited their practical applications. Here, methylammonium lead tribromide (MAPbBr 3 ) crystals are protected by polystyrene (PS) fibre membranes using electrospinning technology. The MAPbBr 3 @PS composite fibre membranes fabricated in this work not only show strong photoluminescence properties but also excellent stability: 70% of the fluorescence intensity of MAPbBr 3 @PS is maintained after soaking in water for 30 days, 85% after leaving at 95 °C for 350 min, and 90% after irradiating under UV light for 100 h. The excellent stability of the MAPbBr 3 @PS fibre membranes may be attributed to the hydrogen bonds between the MAPbBr 3 crystal and the PS fibre. In addition, a high-brightness white-light-emitting diode based on MAPbBr 3 @PS fibre was fabricated, which fully demonstrates its application prospects in the field of colour conversion. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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光电技术
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 1
·116-122
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IF 2.574
Minzhen Zheng,Xiaochuan Chen,Huibin Cheng,Changlin Cao,Qingrong Qian,Dingshan Yu,Xudong Chen
Polymer dielectric composites, which possess high dielectric and loss suppression with excellent mechanical properties, are of crucial importance in practical applications. Herein, high-density polyethylene/nitrile rubber/multiwalled carbon nanotube (HDPE/NBR/MWCNT) composites were fabricated by the dynamic vulcanization (DV) technique. The effect of DV on the structure and properties of HDPE/NBR/MWCNTs was systematically investigated. The results illustrate that the DV technique combines the advantages of the crosslinked phase and melt processability of thermoplastics. With the increase of dicumyl peroxide content, the dielectric permittivity and the mechanical properties clearly increase, due to a better compatibility and dispersibility achieved by DV. More importantly, a continuous decrease of dielectric loss and conductivity are observed with the increase of dicumyl peroxide content. These can probably be assigned to the combination of better dispersion and slower chain mobility of the NBR phase induced by crosslinking. © 2020 Society of Industrial Chemistry
研究领域:
材料科学
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高分子化学
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高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 69
·期 7
·635-643
·
IF 2.574
Hongli Tian,Fangjuan Wu,Peng Chen,Xiangfang Peng,Hui Fang
Polycaprolactone/boron nitride (PCL/BN) composites were prepared by microwave-assisted ring-opening polymerization of ε-caprolactone (ε-CL). In order to improve the dispersibility and interfacial interaction between BN fillers and PCL matrix, hydroxyl functional BN (mBN) was first prepared to be used as a macroinitiator for ε-CL. Then BN grafted PCL (BN- g -PCL) copolymers were obtained via the in situ method, which acted as in situ compatibilizers in the PCL/BN composites. Various techniques were applied to characterize the mBN and PCL/BN composites. The Fourier transform infrared spectroscopy results confirm the structure of the BN- g -PCL copolymer. Field emission SEM graphs exhibit that, for the PCL/mBN composites, the mBN presents a homogeneous dispersion in the matrix and interfacial adhesion between the PCL and mBN is improved. These are beneficial for enhancing the thermal conductivity of the PCL/mBN composites. Notably, the PCL/mBN composite with 5 wt% mBN loading achieves the highest thermal conductivity of 0.55 W m −1 K −1 , which is 2.75 times higher than that of pure PCL, 0.20 W m −1 K −1 . This indicates that the excellent dispersion and interfacial adhesion could lead to the construction of continuous thermal conductive paths at a low BN loading and reduce the heat loss caused by phonon scattering in the interface. Furthermore, mBN could help to improve the mechanical properties of the composite. On adding 5 wt% mBN, the tensile strength and tensile modulus of the composite are 1.58 and 2.05 times higher, respectively, than those of PCL. © 2020 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
·
2020
·Vol. 70
·期 8
·1057-1064
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IF 2.574
Chunhui Jiang,Tingjian Huang,Yuan Chen,Zexi Su,Xiang Yan,Qibin Xu,Mengjin Jiang,Pengqing Liu
To improve the antifouling properties of poly(ether ether ketone) (PEEK) membrane, negatively charged acrylic acid (AA), neutral ethyl hydroxyacrylate (HEA) and positively charged acryloxyethyl trimethylammonium chloride (DAC) as hydrophilic monomers were respectively grafted onto the PEEK hollow fiber membrane surface via ultraviolet irradiation polymerization. The effects of the grafted monomers on surface chemical structure, surface morphology, zeta potential, hydrophilic performance, permeability and the antifouling properties of the membrane were investigated in detail. The results show that the charge state of the membrane surface is closer to the monomer charge characteristic, which obviously affects the permeability and antifouling performance of the membrane. The pure water flux of the membrane grafted with neutral hydrophilic HEA monomer is increased and the antifouling properties to bovine serum albumin (BSA) and sodium alginate (SA) are also enhanced, while the pure water flux of the membranes grafted with negatively charged AA monomer or positively charged DAC monomer is decreased, with different antifouling properties to BSA and SA. Furthermore, the antifouling experiment with BSA under different pH conditions revealed that membrane fouling depends on the pH value, and membrane fouling was the most serious at the isoelectric point of BSA. © 2020 Society of Chemical Industry
研究领域:
材料科学
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环境工程
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高影响因子
POLYMER INTERNATIONAL
·
2015
·Vol. 64
·期 9
·1275-1288
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IF 2.409
Zaihang Zheng,Ting Yang,Bingnan Wang,Bingbing Qu,Hongyan Wang
In this paper, a facile method is introduced to modify melamine phosphate (MP) via the sol–gel process. The aim was simultaneously to increase the water resistance of MP and improve the dispersion and compatibility of MP in acrylonitrile-butadiene-styrene copolymer (ABS). In addition, the incorporation of SiO 2 particles into the MP/dipentaerythritol (DPER) system can further ameliorate the char-forming ability and enhance the flame retardant properties of polymer composites. The chemical structure and surface morphology of SiO 2 @MP were confirmed and observed by Fourier transform infrared (FTIR) spectroscopy, SEM and TEM, respectively. The results demonstrate that ABS/SiO 2 @MP/DPER (3/1) at a loading of 30 phr reaches 31.2% limiting oxygen index and achieves a UL-94 V-0 rating. Moreover, FTIR spectra indicate that the main char-forming process of the SiO 2 @MP/DPER system occurs at 365–420 °C. A potential condensed flame retardant mechanism of SiO 2 @MP and DPER in ABS composites is proposed via the systematic analysis of char residue after combustion by FTIR spectroscopy, SEM and X-ray photoelectron spectroscopy. © 2015 Society of Chemical Industry
研究领域:
材料科学
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高分子化学
·
消防安全工程
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高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 6
·1102-1112
·
IF 2.433
Cheng Liu,Liquan Yang,Liyuan Qiao,Chengde Liu,Manxia Zhang,Xigao Jian
Chitosan (CS) is a semi-natural polymer with supreme biological function, while the strong interchain hydrogen bonds cause poor water solubility and limit its broader use. To break the semi-rigid structure of CS, a kind of CS modified by adamantane (AD-CS) was successfully synthesized by amidation reaction with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride as catalyst. The chemical structure of AD-CS was characterized by Fourier transform infrared spectroscopy and 1 H NMR. The AD substitution degree of CS is around 2%, calculated by 1 H NMR. A soft and transparent hydrogel composed of hydrogen bonds was obtained directly by simply adding a certain amount of water under mild conditions. Rheological measurements were carried out to research the mechanism of hydrogel formation by measuring the influence of different additives and conditions on the AD-CS hydrogel. Reinforced hydrogels were prepared by freezing and thawing. The mechanical strength and self-healing property of reinforced and pristine hydrogels were assessed with an oscillatory rheometer. The modulus of the reinforced hydrogel was obviously enhanced without much loss of self-healing property. Other properties such as adhesion, injectability and temperature response were also studied. These injectable and self-healing hydrogels show potential value in medical care. Additionally, this is a new method to design CS hydrogels with their original interchain hydrogen bonds. © 2019 Society of Chemical Industry
研究领域:
生物材料
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医学工程
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高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 6
·1084-1090
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IF 2.433
Shaobin Xu,Dekun Sheng,Xiangdong Liu,Fance Ji,Yan Zhou,Li Dong,Haohao Wu,Yuming Yang
Recently, self-healing polymers have been one of the most intriguing academic fields due to the fact that they can increase their service lives and reduce the amount of waste. Here we designed and synthesized a novel telechelic polyurethane with dopamine (DA) end groups that are coordinated with Ca 2+ to form dynamic non-covalent bonds. The tensile stress of the designed polyurethanes increases with increase in the amount of metal cation added, while the strain at break slightly decreases. Rheological tests show that the ionic coordination between Ca 2+ and catechol can dynamically break and recombine under the stimulation of seawater, endowing the polymer with superior self-healing properties (up to 84% based on toughness). Therefore, the seawater-triggered self-healable, super tough polyurethane presented here is very intriguing as it has many potential applications especially in the marine environment. © 2019 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
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2019
·Vol. 69
·期 2
·206-214
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IF 2.433
Si Peng,Qiu-yue Wang,Xue Xiao,Rui Wang,Juan Lin,Qing-han Zhou,Li-na Wu
Recently, theranostic candidates that provide a combination of gene delivery and image diagnosis have attracted much interest in medical research. However, there are still many challenges for their clinical applications, such as uncontrollable gene delivery, high cytotoxicity, low transfection efficiency and reduced image contrast. Herein, redox-responsive polyethyleneimine-coated magnetic iron oxide nanoparticles (IONs@rPEI) were prepared for both efficient gene delivery and magnetic resonance (MR) imaging. Firstly, crosslinked rPEI was synthesized by Michael addition reaction with N , N -bis(acryloyl)cystamine, dopamine and low-molecular-weight branched PEI. The rPEI was then coated onto IONs by ligand exchange reaction forming IONs@rPEI. The physicochemical properties of the IONs@rPEI, such as chemical structure, size, zeta potential and DNA condensation ability, were investigated. In addition, a rapid degradation of the as-prepared nanoparticles was observed, which was triggered by reducing glutathione via destruction of disulfide linkages suggesting a potential controllable DNA release in tumor cells. In MR imaging detection, the IONs@rPEI had a high T 2 relaxivity of 81 L mmol −1 s −1 indicating a potential usage as MR imaging contrast reagent. In cell assay, the IONs@rPEI exhibited low cytotoxicity and good transfection efficiency. In conclusion, the as-prepared crosslinked IONs@rPEI can be used as a promising technology platform for gene therapy and MR imaging in theranostics. © 2019 Society of Chemical Industry
研究领域:
生物医学工程
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分子生物学
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材料科学
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DOI
高影响因子
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