EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Jun Yang,Yuanrong Cheng,Yunxia Jin,Dunying Deng,Fei Xiao
Three kinds of benzocyclobutene (BCB)-terminated imide monomers have been synthesized by the imidization and Heck reaction. The obtained BCB monomers exhibit good solubility in a wide range of organic solvents at room temperature. The BCB monomers show an exothermal curing behavior in the range of 220–270 °C. The curing kinetic parameters, the apparent activation energy ( E a ), the frequency factor ( A ) and the reaction order ( n ), are obtained by non-isothermal DSC method. The cured BCB resins exhibit good thermal stability ( T d 5 > 435 °C), high glass transition temperature ( T g > 300 °C) and low dielectric constant. Moreover, high quality negative patterns of the BCB films are obtained after the photolithography.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qin Zhang,Guo-Rui Zhu,Xiang-Xin Xiao,Qing-Song Liu,Min Jiang,De-Ming Guo,Hai-Bo Zhao,Wen-Da Li,Li Chen,Bo-Wen Liu,Yu-Zhong Wang
Constructing micro cross-linking structures into molecular chains has demonstrated the ability to improve basic properties, such as mechanical strength and thermal stability, of thermoplastic polymers. However, this method has limitations when it comes to improving the functionality of polymers. Herein, we reported a multifunctional micro cross-linking network that improves not just mechanical strength but also flame retardancy, dielectric properties, battery performance, antistatic properties, etc . A novel phosphinamide-containing monomer was designed, synthesized, and copolymerized into the polymer chain of polyamide 6, a typical thermoplastic polymer. On the one hand, the micro cross-linking structure was successfully obtained through the amide interchange reaction between the side-chain phosphinamide groups and the main-chain amide groups, leading to a 23.7% improvement of tensile strength and largely maintained tensile toughness. On the other hand, the functional phosphorus groups showed an efficient free-radical-capturing effect during fire, endowing the copolymer with excellent flame retardancy at a low monomer content of 2 mol%. Additionally, the copolymer also possessed great spinnability, melt-crystallization performance, as well as dielectric property, antistatic property, and battery performance, enabling its potential in a wide variety of applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 9
·
IF 1.64
Wenqiu Chen,Quantao Li,Quanyuan Zhang,Zushun Xu,Xianbao Wang,Changfeng Yi
A series of amine-terminated and anhydride-terminated hyperbranched polyimides (HBPIs) were successfully prepared with various commercial dianhydrides and a novel BB′ 2 -type aromatic triamine, 2,4,6-tris[4-(4-aminophenoxy)phenyl]pyridine, with a symmetrical triaryl-substituted pyridine segment and prolonged flexible linkages. The chemical structure of the triamine monomer and the hyperbranched structure of the resulting polymers were verified by Fourier transform infrared spectroscopy and 1 H-NMR spectroscopy. The resulting HBPIs, which mainly held an amorphous morphology, exhibited improved organosolubilities in several strong polar aprotic solvents, good heat resistance with glass-transition temperature values in the range 218.6–311.0°C, and excellent thermal stabilities in both N 2 and air [the temperature at 5% weight loss ( T 5% ) in N 2 was higher than 529.8°C and the T 5% in air was higher than 465.1°C]. The obtained HBPI films also showed outstanding mechanical properties with tensile strength, tensile modulus, and elongation at break values of 86.4–101.3 MPa, 1.73–2.04 GPa, and 5.07–10.67%, respectively; considerable optical transparency; low water absorption; and neutral interface wettability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41544.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2010
·Vol. 66
·期 9
·1191-1206
·
IF 1.014
Yan Shanyin,Chen Wenqiu,Yang Xiaojin,Chen Chuan,Huang Mingfu,Xu Zushun,Yeung Kelvin W. K.,Yi Changfeng
A novel pyridine-containing aromatic diamine monomer, 4-phenyl-2,6-bis[3-(4-aminophenoxy)phenyl]pyridine ( m , p -PAPP), was successfully synthesized by a modified Chichibabin reaction of benzaldehyde and a substituted acetophenone, 3-(4-nitrophenoxy)acetophenone ( m , p -NPAP), followed by a reduction of the resulting dinitro compound 4-phenyl-2,6-bis[3-(4-nitrophenoxy)phenyl]pyridine ( m , p -PNPP) with Pd/C and hydrazine monohydrate. The aromatic diamine was employed to synthesize a series of pyridine-containing polyimides (PIs) by polycondensation with various aromatic dianhydrides in N , N -dimethylformamide (DMF) via the conventional two-step method, and further thermal or chemical imidization forming PIs. The inherent viscosities of the resulting poly(amic acid)s and PIs were 0.59–0.73 and 0.56–0.68 dL/g; most of the PIs obtained by chemical imidization were readily soluble in common organic solvents such as DMF, N , N -dimethylacetamide (DMAc), N -methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), etc. Meanwhile, strong and flexible PI films were obtained, which had good thermal stability, with the glass transition temperature ( T
g ) of 204.5–237.4 °C and the temperature at 10% weight loss of 527.7–552.0 °C in nitrogen atmosphere, as well as outstanding mechanical properties with tensile strengths of 88.6–90.4 MPa, a tensile moduli of 1.04–1.56 GPa, and elongations at break of 7.2–8.7%. The PI films also were found to possess low water uptake of 0.89–0.98%.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 130
·107793-107803
·
IF 3.84
Shanyou Liu,Yunhe Zhang,Xueping Wang,Haiwei Tan,Ningnig Song,Shaowei Guan
To investigate the properties of hyperbranched polyimides (HBPIs) for potential optical applications, novel fluorinated tetra-amine monomers with ether and sulfonyl groups, 4,4′-di[3,5-di(2-trifluoromethyl-4-aminophenoxy)phenoxy]sulfone, and five kinds of long-chain dianhydrides, have been designed and synthesized. A series of anhydride-terminated hyperbranched polyimides have been prepared via a two-step method with chemical imidization. The HBPIs possess outstanding solubility and show excellent thermal and optical properties. The glass transition temperatures (Tg) of the HBPIs range from 230–242 °C determined by differential scanning calorimetry (DSC), and 232–263 °C by thermomechanical analysis (TMA), depending on the dianhydride used. The 5% weight loss temperatures are in the range of 480–533 °C, showing high intrinsic thermal-resistant characteristics of the HBPIs. The HBPI films show good optical transparency, higher than 80% at 800 nm. The cast polyimide films have favorable mechanical properties with tensile strengths of 91–112 MPa, elongation at break of 5.99–7.99%, and initial modulus of 2.14–2.57 GPa. The polyimides exhibit average refractive indices of 1.5780–1.6271, and birefringence of 0.0065–0.0079 because of the hyperbranched structure. The PI derived from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]hexafluoropropane possesses the lowest refractive indices due to the high fluorine content in the polymer chain.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 77
·期 12
·6509-6523
·
IF 2.014
Wang Chenyi,Yu Bin,Jiang Cairong,Zhao Xiaoyan,Li Jian,Ren Qiang
A novel aromatic diamine monomer with asymmetric large side group: 4-(2,4,6-trimethyl)phenoxy-1,3-diaminobenzene, was synthesized by a two-step organic reaction. The monomer was separately subjected to a one-step high-temperature polycondensation reaction with three commercial aromatic dianhydrides to obtain a series of polyimides. Their structures and properties were characterized and studied by FTIR, NMR, UV, TGA, DSC, etc. The obtained polyimides showed excellent solubility not only in high-boiling solvents such as NMP, DMAc, and DMF, but also in low-boiling solvents such as CHCl 3 and CH 2 Cl 2 . Their tensile strength was in the range of 76.9–93.5 MPa, the elongation at break was between 4.8% and 7.3%, and the modulus of elasticity was in the range of 1.6–1.8 GPa. The obtained films exhibited good optical transparency, and the representative polyimide derived from 4,4′-oxydiphthalic dianhydride exhibited a light transmittance of more than 83% at a wavelength of 450 nm. Moreover, these polyimides also possessed good thermal properties. Their glass transition temperatures are between 285 °C and 345 °C, and the 10% weight loss temperature in air and nitrogen is above 463 °C, showing excellent thermal properties.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Tianyi Ma,Yanlei Su,Yafei Li,Runnan Zhang,Yanan Liu,Mingrui He,Yang Li,Nanxi Dong,Hong Wu,Zhongyi Jiang
A kind of novel electro-neutral nanofiltration (NF) membrane at neutral pH was fabricated by interfacial polymerization from a novel zwitterionic amine monomer PEI-g-SBMA. The zwitterionic amine endowed the resultant NF membrane with an electro-neutral separation layer under neutral condition and enhanced antifouling property via regulation of surface charge balance. The electro-neutral zwitterionic NF membranes (PEI-g-SBMA/TMC) showed a high water flux of 132 L/ (m 2 h MPa), i.e. over 2 times higher than that of the PEI/TMC membranes without grafted SBMA. The PEI-g-SBMA/TMC membrane exhibited a high dye rejection (90.6% for Orange GII) but a low salt rejection (7.1% for NaCl and 50.4% for Na 2 SO 4 ). Meanwhile, the antifouling property against bovine serum albumin (BSA), sodium alginate (SA) and humic acid (HA) was significantly improved compared with the PEI/TMC membranes. The as-fabricated electro-neutral PEI-g-SBMA/TMC membranes with high organics rejection and low salt rejection as well as good antifouling property may find promising application potential in food, pharmaceutical, chemical industry and membrane bioreactor (MBR) processes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 29
·13709-13723
·
IF 3.5
Yan Shiao,Shao Lijing,Shu Liheng,Wang Xiang,Shi Bin,Dong Qiao
Grouting engineering is extensively employed in highway maintenance, tunnel excavation, mining, and other domains. As application scenarios become more complex, the demands for injectivity and toughness of grouting materials escalate. This research presents the fabrication of a dual-network cementitious material through acrylamide (AM) monomers in-situ polymerization and ultra-fine portland cement for grouting. The in-situ polymerization of AM increases the fluidity of cement paste, forms a hydrogel three-dimensional network structure, and significantly reduces the initial setting time from 345 to 35 min at a 5% AM content. The early-stage compressive strength (0–7 days) is inhibited by the in-situ polymerization, the flexural strength is notably increased, with an overall toughness improvement of 174.4% at a 7% AM content. The in-situ polymerization influences the early hydration behavior of ultra-fine portland cement by delaying the hydration induction period and affecting calcium hydroxide content and the bound water in calcium silicate hydrate. The complexation between metal ions (Ca 2+ , Al 3+ ) in ultra-fine portland cement and carboxyl groups in the polymer enhances organic–inorganic interaction. The three-dimensional network structure of the cement hydration products and the polymer will form a dual-network structure, further enhancing the performance of the ultra-fine portland cement. In this research, the potential application of AM in-situ polymerization in the enhancement of ultra-fine portland cement grouting is proposed.
研究领域:
土木工程
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2022
·Vol. 30
·期 8
·579-586
·
IF 2.127
Deng Bo,Luo Xueqin,Jiang Feng,Liu Wei,Gu Jianwei,Liu Chao,Song Yanan
In the petroleum industry, water-soluble polymers can be used as oil displacement agents. However, the use of water-soluble polymers is limited because of poor temperature and salt resistance. To improve temperature and salt resistance, a weakly cationic polymer with large side groups (PAM/AMPS/VI) was prepared by copolymerizing acrylamide (AM) with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and 1-vinylimidazole (VI). The viscosity of PAM/AMPS/VI water solutions can be increased more than 20 mPa·s compared with PAM/AMPS. In addition, the viscosity of the solution increased continuously after aging at 80 °C, showing good temperature and salt stability. The protonated tertiary amine in the imidazole ring electrostatically interacts with the sulfonic group, increasing the viscosity and salt resistance of the polymer. The five-membered ring of imidazole also enhances the rigidity of the polymer chain and improves the temperature tolerance. As a confirm of the result, a complete spatial network of PAM/AMPS/VI was observed in scanning electron microscopy (SEM) micrographs. Using weak cationic polymers with large side groups can provide a reference for the design of new temperature tolerance and salt resistant polymer.
研究领域:
石油工程
·
高分子化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Xianfeng Que,Yurong Yan,Zhiming Qiu
Benzocyclobutene resins play an important role in microelectronic industry owing to their excellent physical and chemical properties. In our work, three novel benzocyclobutene-terminated imide monomers were synthesized via the reaction of 1-aminomethyl benzocyclobutene with various aromatic dianhydrides. The monomers exhibited good processability with superior solubility and low melting points (<163.5 °C), and they showed similar curing behaviors under N 2 with an exothermic peak in differential scanning calorimetry (DSC) curves ranging from 217.3 °C to 287.7 °C. Highly crosslinked resins obtained at 150–300 °C exhibited superior tensile strength (>74.3 MPa), outstanding thermal stability (T d > 466 °C in N 2 ), high glass transition temperature (>278 °C), high storage modulus (>3.25 GPa at 30 °C), low dielectric constant (<3.07 at 1 MHz) and good water resistance (the water absorption was below 0.81% after immersed in water for 24 h and the water contact angle was higher than 86.6°). Atomic force microscopy demonstrated the perfect uniformity and planarity of the cured films.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2015
·
IF 2.515
Anqiang Zhang,Qiongqiong Liu,Yufeng Lei,Shuanghao Hong,Yaling Lin
Three series of acrylamide monomers/polymers containing quaternary ammonium salts (QASs), i.e., acrylamide QAS monomers (QDs), homopolymers of QDs (PQDs) and copolymers of QDs with acrylate monomer (PQDCs), were synthesized and employed in antimicrobial tests against both bacteria ( Escherichia coli ( E . coli ) and Staphylococcus albus ( S . albus )) and phytopathogenic fungi ( Rhizoctonia solani ( R . solani ) and Fusarium oxysporum f . sp. cubense race 4 ( Foc 4)). The antibacterial activity of the QASs was evaluated by determining the minimum inhibitory concentration (MIC) against E . coli and S . albus by the TTC coloration method, and the antifungal activity was measured by mycelia growth inhibition as well as MIC and the minimum fungicidal concentration (MFC) values. The results indicated that PQD homopolymers and PQDC copolymers showed far better antimicrobial activities than QD monomers . PQDC copolymers by incorporating hydrophobic acrylate units into the main chain of polyacrylamide backbone displayed even better antimicrobial activities, depending on QAS structure and hydrophobic content. Moreover, polymers with benzyl group attached to nitrogen atom showed better inhibitory effect on bacteria and phytopathogenic fungi. The results could assist understanding and development of future design of antimicrobial polymers as potential fungicide agents to control plant disease.
研究领域:
微生物学
·
植物病理学
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Chenlu Liu,Xiaoting Feng,Keming Zhang,Xiaohe Tian,Qingnan Wang,Yanting Tang,Yueyangchao Yu,Tianhe Gu,Rui Zhang,Xiangyu Liu,Shaofei Wang
Polyamide membranes with rigid twisted structures show excellent permeance and rejection in the field of organic solvent nanofiltration (OSN). However, challenges such as low reactivity, complex synthesis procedures, and high costs persist for certain rigid and twisted monomers, posing obstacles in their synthesis or application processes. To address these challenges, we adopt a low-cost rigid and twisted tetraamine monomer, N,N,N′,N′-tetrakis(4-aminophenyl)-1,4-benzenediamine (TK), for the preparation of polyamide OSN membranes through interfacial polymerization with various acyl chlorides. TK is effectively introduced into the polyamide chain, which involves not only the reactivity of monomers, but also the influence of monomer angle configuration on the formation of chain segments, forming different rigid networks and enabling the active layer to have excellent stability and high porosity. Consequently, the rigid twisted polyamide OSN membranes exhibit a methanol permeance of 13.8 L m −2 h −1 bar −1 and a molecular weight cut-off (MWCO) of 266 Da, outperforming many reported membranes. This work highlights the use of TK as a promising, cost-effective monomer to engineer high-performance OSN membranes with tailored structural features, offering a practical solution for enhanced organic solvent separation processes.
研究领域:
材料科学
·
分离技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）