POLYMER INTERNATIONAL
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2020
·Vol. 69
·期 12
·1267-1274
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IF 2.574
Xin Liu,Yanwei Gao,Xuanbo Zhu,Yingshuang Shang,Zengduo Cui,Qixing Yan,Haibo Zhang
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4′-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4′-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300 °C, and BDS-PDBES can still maintain its 30% storage modulus at 295 °C. In addition, the two novel polymers also show excellent thermal stability ( T d5 = 526 °C), high elongation at break ( ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity ( λ 300°C = 0.28 W ·m −1 ·K −1 ).
研究领域:
高分子化学
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材料科学
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高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 12
·1659-1667
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IF 2.99
Yan Wang,Xianqiang Pei,Lin Xia,Zhancheng Zhang,Qihua Wang,Tingmei Wang
In this paper, we present an efficient and green extraction process for Eucommia ulmoides gum (EUG) to solve the tricky problems in separation and precipitation, providing a new idea for the industrialization of EUG extraction. Subsequently, the obtained EUG was blended with low density polyethylene (LDPE) and zinc methacrylate (ZDMA) to fabricate novel shape memory composites with both covalent and ionic crosslinking networks. It was found that the improvement in mechanical performance and enhancement in shape recovery ability of the EUG/LDPE/ZDMA composites was attributable to the Zn 2+ -based ionic crosslinks. The EUG/LDPE/ZDMA shape memory composites could be candidates in the production of medical fixing materials, hot-shrinkable tubes and packaging products. © 2021 Society of Chemical Industry
研究领域:
材料科学
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生物材料
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绿色化学
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高影响因子
POLYMER INTERNATIONAL
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2021
·Vol. 70
·期 12
·1668-1679
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IF 2.99
Jiarong He,Lingzhi Zhang,Haoxiang Zhong
Gum arabic grafted poly(acrylic acid) (GA- g -PAA) is synthesized as a mechanically robust water-soluble binder for silicon (Si) anodes in lithium-ion batteries by graft polymerization of acrylic acid onto GA backbone via a free radical reaction. 1 H NMR and Fourier transform infrared spectroscopies and thermogravimetric analysis are systematically conducted to confirm the grafting polymerization process. GA- g -PAA with different grafting length of PAA shows enhanced adhesion strength and excellent flexibility after grafting. Optimal Si-GA- g -8PAA electrode displays better cyclic stability, higher Coulombic efficiency and superior rate properties compared with a Si electrode with linear PAA binder. The Si-GA- g -8PAA electrode exhibits a high electrical conductivity, low interfacial/charge transfer resistance and high lithium-ion diffusion coefficient. GA- g -8PAA binder with grafted structure not only can maintain the mechanical and electrical integrity of the electrode, facilitating favorable electrochemical kinetics, but also assists in preserving a stable solid electrolyte interphase on Si surface upon long-term cycling. Such a facile strategy for designing a novel grafted binder shows potential for practical application on high-capacity anode materials with large volume change. © 2021 Society of Industrial Chemistry.
研究领域:
材料科学
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电化学
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高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 6
·1186-1193
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IF 2.433
Qi Wu,Xiaoru Ma,Feng Zheng,Xuemin Lu,Qinghua Lu
A new diamine with bulky pendant biphenyl and ortho -position dimethyl structures, 4,4′-((1,1′-biphenyl)-4-ylmethylene)bis(2,6-dimethylaniline), was synthesized via a one-pot reaction of 4-biphenyl carboxaldehyde and 2,6-dimethylaniline. The diamine was employed to polymerize with several dianhydrides via one-step condensation under high-temperature conditions. The light yellow or colorless polyimide (PI) films obtained were found to have cut-off wavelengths in the range 286–358 nm and transmittance over 80% in the visible region (400–780 nm). Meanwhile, these PIs possessed excellent solubility in common organic solvents, even in low-boiling-point solvents such as chloroform (CHCl 3 ), dichloromethane (CH 2 Cl 2 ) and tetrahydrofuran. The glass transition temperatures ( T g ) of the PIs were determined to exceed 343 °C, even to 456 °C. All PI films were flexible with a tensile strength of 78–119 MPa, a Young's modulus of 2.0–2.5 GPa and elongation at break of 4.0%–8.2%. Therefore, these colorless PIs can be used as candidate materials for flexible display substrates. © 2019 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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2019
·Vol. 68
·期 7
·1361-1366
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IF 2.433
Zhuangzhuang Qiao,Deqiu Xu,Yan Yao,Shaomin Song,Meihui Yin,Jianbin Luo
A series of fluorinated polyurethanes (FPUs) with various contents of fluorinated chain extender (EF) and the same amount of poly(oxytetramethylene glycol) and diphenylmethanediisocyanate were synthesized to explore the relationship between the surface physicochemical properties and bulk microphase separation structures of these FPUs and their antifouling activities against model bacteria and platelets. The bulk microphase separation of FPUs increased with the amount of incorporated EF. It was found that the surfaces of all FPUs were saturated by a layer of fluorocarbon chains which resulted in similar chemical composition and wetting activities for the three kinds of FPUs. The FPUs with lower or similar microphase separation compared with non-fluorinated polyurethane chain-extended with 1,4-butanediol showed similar or even increased adhesion of bacteria and platelets. Notably, FPU with a higher degree of microphase separation than non-fluorinated polyurethane displayed excellent antifouling activities against both model bacteria and blood platelets. It is therefore concluded that the increased microphase separation of the FPUs results in enhanced antifouling properties. © 2019 Society of Chemical Industry
研究领域:
材料科学
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生物材料
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表面化学
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高影响因子
POLYMER INTERNATIONAL
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2021
·Vol. 71
·期 1
·38-46
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IF 2.99
Heping Wang,Bang Feng,Qianwen Zhang,Qiang Du,Qiuhong Bai,Cong Li,Yehua Shen
For the first time, a novel amidinothiourea-linked covalent organic framework (COF) (TpAt) has been successfully synthesized by the condensation between 1,3,5-triformylphloroglucinol and amidinothiourea via vacuum solvothermal reaction, and was further utilized for the adsorption of metal ions from aqueous solution. The effects of initial concentration, pH and contact time on the adsorption process were investigated. As a result, the TpAt COF showed maximum binding capacities as high as 95.44, 100.76 and 99.08 mg g –1 for Cr(III), Cd(II) and Cu(II) within 180 min at the initial concentration of 100 mg L –1 , respectively. The isotherms of metal ions onto TpAt could be described by the Freundlich isotherm equation, and the adsorption kinetics followed the pseudo-second-order model. The TpAt could be reused for more than five adsorption–elution cycles, whilst basically maintaining its original adsorption performance and the structural integrity of the COF layers. The robust adsorption efficiency can be attributed to the coordination between metal ions and N, O and S atoms in the TpAt framework. The TpAt COF represents an ideal candidate for the removal of heavy metal ions in environmental pollution treatment. © 2021 Society of Industrial Chemistry.
研究领域:
材料科学
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环境科学
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高影响因子
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
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2020
·Vol. 70
·期 3
·282-287
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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
·
2012
·Vol. 62
·期 8
·1187-1191
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IF 1.902
Hongfei Leng,Qingyuan Niu,Wenhui Wu
A novel conjugated polymer film with microscale/submicroscale porous morphology fabricated from crosslinked poly(fluorene- co -carbazole) (PFC1) was developed for the detection of 2,4-dinitrotoluene (DNT). The fluorescent conjugated polymer PFC1 with pendant photo-crosslinkable coumarin groups was synthesized by Suzuki coupling polymerization. Taking advantage of the phase separation of PFC1/polystyrene (PS) blends in the film and the solvent-resistant network, porous structured films were prepared by removal of PS. Films with porous morphologies exhibited marked responsive sensitivity to trace DNT vapor due to the unique porous structure favoring the diffusion of and association with DNT molecules. The formation of a crosslinked network by dimerization of the coumarin moieties may be beneficial for isolating the polymeric backbones, thus to some extent preventing chain aggregation. This facile fabrication method enabled the crosslinked porous films to be efficient fluorescence chemosensors towards the detection of trace amounts of DNT vapor.© 2012 Society of Chemical Industry
研究领域:
材料科学
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分析化学
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高影响因子
POLYMER INTERNATIONAL
·
2012
·Vol. 62
·期 10
·1457-1464
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IF 1.902
Youmei Bao,Jing He,Yuesheng Li
Hyperbranched polyesters with thioether linkages were facilely prepared from methyl 10-undecenoate, a castor oil-derived renewable chemical. The monomer was obtained in excellent yield through thiol–ene click chemistry in the presence of catalytic amounts of photoinitiator under UV irradiation. Subsequent bulk polycondensation via a transesterification process catalyzed by Ti(OBu) 4 , Sb 2 O 3 or Zn(OAc) 2 gave hyperbranched polyesters with high molecular weights and unusual crystalline properties. The degree of branching in the range 0.45 − 0.54 calculated from quantitative 13 C NMR spectroscopy and low inherent viscosities of 0.16 − 0.25 dL g −1 strongly confirmed the hyperbranched structures of the resultant polymers. © 2012 Society of Chemical Industry
研究领域:
材料化学
·
可再生资源化学
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高影响因子
危险品化学品经营许可证（带存储）