HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Xing-Hua Guan,He-Ran Nie,Hong-Hua Wang,Ji-Yong Zhao,Zhi-Peng Wang,Rui Wang,Bao-Feng Liu,Guang-Yuan Zhou,Qiang Gu
A series of aromatic polyesters bearing fluorene and phthalein groups were synthesized from commercially available 9,9-bis(4-hydroxyphenyl)fluorene (BPF), phenolphthalein, and terephthaloyl chloride through an interfacial polymerization method. The microstructure, molecular weight, morphology, thermal properties, and thermal decomposition mechanism of these aromatic polyesters were investigated. Their mechanical properties were also evaluated. The results suggested that the copolymer compositions were approximately equal to the feed compositions. Moreover, the increase in the BPF unit content increased the glass transition and weight loss temperatures of the aromatic polyesters, owing to the strong rigidity of the bulky fluorene group. All the polymers were amorphous and exhibited good solubility in common organic solvents. Hence, the synthesized polymers could be easily cast into flexible films. The copolymer film samples exhibited better mechanical properties than those of the homopolymers. The tensile strength, Young’s modulus, and elongation at break of the polymers first increased gradually, and then decreased with increasing BPF content. Notably, the copolymers exhibited the best mechanical properties at the BPF content range 30–50%. Owing to their characteristics, these synthesized polymers show great potential for application as high performance membrane materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zihao Wu,Jian Wang,Jiaxin Liu,Jinhua Lei,Heran Nie,Qiliang Yuan,Zhipeng Wang,Liang Li
Aromatic polyesters are an attractive class of engineering thermoplastics with excellent chemical properties, thermal stability and environmental stability, as well as good optical properties, but they have rarely been reported. Refractive index (RI) is one of the properties commonly used to compare the optical properties of materials. The higher the refractive index, the thinner the lens made of the corresponding material; however, the preparation of high-refractive-index polymers is currently a thorny issue, in which the structure of the polymer molecules has a great impact on their refractive index, to design high-refractive-index materials requires starting from the structure of the molecules. Phenolphthalein has a unique structure with a molecular skeleton consisting of three benzene rings and a cyclic lactone that exhibits a twisted non-coplanar structure. This cyclic side group can hinder the accumulation between the polymer molecular chains, not only improving the solubility of the polymer molecules, but also increasing the transparency of the polymer films. In this work, we used phenolphthalein (PHT) and its derivatives to polymerize with terephthaloyl chloride (TPC), respectively, through the structural differences between them, the influence of polymer structure on the refractive index and thermal properties was discussed. Among them, polyester PAR-NPHT had the highest refractive index (nd>1.67), and is expected to be a new generation of optical materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 38
·期 10
·1082-1091
·
IF 3.154
Wang Jing-Gang,Zhang Xiao-Qin,Shen Ang,Zhu Jin,Song Ping-An,Wang Hao,Liu Xiao-Qing
In order to explore new substitutes for 2,5-furandicarboxylic acid (FDCA) or poly(ethylene 2,5-furandicarboxylate) (PEF) and try to develop more ideal bio-based polyesters, several thiophene-aromatic polyesters (PETH, PPTH, PBTH, and PHTH) were synthesized from dimethyl thiophene-2,5-dicarboxylate (DMTD) and different diols, including ethylene glycol, 1,3-propanediol, 1,4-butanediol, and 1,6-hexanediol. The chemical structures of obtained polyesters were confirmed by nuclear magnetic resonance spectroscopy ( 1 H-NMR and 13 C-NMR). Determined by GPC measurement, their average molecular weight ( M w ) varied from 5.22 × 10 4 g/mol to 7.94 × 10 4 g/mol with the molar-mass dispersity of 1.50–2.00. Based on the DSC and TGA results, the synthesized polyesters PETH, PPTH, and PBTH displayed comparable or even better thermal properties when compared with their FDCA-based analogues. From PETH to PHTH, their T g varied from 64.6 °C to −1 ×C while T 5% ranged from 409 °C to 380 °C in nitrogen atmosphere. PETH showed elongation at break as high as 378%, tensile strength of 67 MPa, and tensile modulus of 1800 MPa. Meanwhile, the CO 2 and O 2 barrier of PETH was 12.0 and 6.6 folds higher than those of PET, respectively, and similar to those of PEF. Considering the overall properties, the synthesized thiophene-aromatic polyesters, especially PETH, showed great potential to be used as an excellent bio-based packaging material in the future.
研究领域:
材料科学
·
生物基材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Zexi Wu,Caijie Shi,Tao Peng,Qiannan Cheng,Qingquan Tang,Luoxin Wang,Hua Wang,Siwei Xiong
Liquid crystal aromatic polyesters (LCAPs) have been used in wide applications, such as chip packaging and airship skin. The traditional polymerization of LCAP is catalyzed by inorganic salts, for example, sodium acetate. Herein, we reported three kinds of ionic liquids (ILs) as catalysts to promote LCAP polymerization for the first time. The effects of ILs on the polymerization behaviors are investigated by in situ observing the liquid crystal (LC) phase behaviors based on the thin-film polymerization technique. The evolution of LC phase over time was detailly investigated by analyzing the emergence, fusion, and growth of LC phase. The temperature from 170 to 210°C and the catalyst concentration in range from 0 to 0.5 wt% are compared, showing that temperature at 210°C and catalyst concentration at 0.5 wt% are the best polymerization conditions for all ILs catalysts. In comparison with trimethylsulfonium iodide and piperidine acetate, 1-ethyl-3-methylimidazolium acetate has the best catalytic effect for the polymerization of LCAP in all experimental conditions. The successful polymerization was confirmed by FT-IR spectra, showing the increased intensity of vibration peak at 1735 cm −1 attributed to the generation of ester groups while the decreased intensities of vibration peaks at 1759 and 1370 cm −1 .
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Pengfei Chen,Yunfei Qu,Lida Meng,Lei Jiao,Jiancong Lu,Jianguo Lu
A novel aromatic polyesteramide-based membrane with high free volume for water desalination was prepared by adding a rigid cardo-contorted biphenol monomer to the aqueous phase solution of m-phenylenediamine (MPD) and then carrying out the interfacial polymerization. Compared with the polyamide (PA) membrane, the polyesteramide membrane with high free volume and ultrathin separating layer exhibited 250% increase in flux and 1.2% loss in salt rejection. Moreover, acid and alkali stabilities of polyesteramide membranes were studied by immersing the polyesteramide membranes into acid, aid/ethyl alcohol (EA), alkali and alkali/EA aqueous solutions. After acid/alkali treatments, the surface contact angles of acid/alkali-treated PA/9,9-bis(4-hydroxyphenyl)fluorine (PA/BHPF) membranes were much smaller than the pristine PA/BHPF membrane. With EA, both the acid/EA-treated and alkali/EA-treated polyesteramide membranes exhibited a significant increase in water flux; moreover, the acid/EA-treated membranes showed a simultaneous increase in water flux and salt rejection within a treatment time of 24 h, due to the increase in hydrophilicity and the partial dissolution of small polymer fragments on membrane surface.
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
危险品化学品经营许可证（带存储）