RSC Advances
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2016
·Vol. 6
·期 87
·84284-84293
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IF 3.289
Wen-Qiang Zhang,Xiu-Li Wang,Gui-Cheng Liu,Li Chen,Yu-Zhong Wang
In order to make clear how the numbers of para-aryl ether linkages affect the solubility, thermal transition behavior and mechanical properties of para-(p-PEAs), meta-poly(ether-amide)s (m-PEAs), a series of para-substituted aryl ether diamine monomers with 2, 3, 4 or 5 ether linkages were synthesized, and then reacted with terephthalic acid and isophthalic acid via the Yamazaki–Higashi phosphorylation method to prepare wholly aromatic PEAs. The PEAs with intrinsic viscosity values in the range of 0.81–1.16 dL g−1 were obtained and characterized by FT-IR, NMR, and elemental analysis. Although the Tgs and Tms of PEAs decrease with the increasing numbers of aryl ether linkages, their Tgs and Tms still are above 180 °C and 320 °C, respectively. p-PEAs have a high crystallinity making it difficult to dissolve them in common organic solvents even when 5 aryl ether linkages are introduced. Conversely, except for m-PEA5 with a lower polarity, the other m-PEAs show good solubility due to their low crystallinity. Besides, the decomposition temperatures at 5% weight loss of all PEAs exceed 430 °C and their residual yields at 700 °C are above 50% in N2, illustrating that they have excellent thermal stability. It is found that by casting m-PEAs DMAc solution in a dish, the transparent films with high Young's modulus (2.6–3.5 GPa) can be successfully obtained.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Muntadher M. Alwan Almijbilee,Xitian Wu,Ayang Zhou,Xiaokuo Zheng,Xingzhong Cao,Wei Li
An interfacial assembly and polymerization procedure was adopted to synthesized organic solvent polyetheramide thin film composite (TFC) nanofiltration membrane using 4,4′-oxydianiline (ODA) and trimesoyl chloride (TMC) monomers upon the ethylenediamine-crosslinked polyetherimide (C-PEI) membrane substrate. DFT calculations indicate that the unreacted amine terminals located on the C-PEI membrane surface can form intermolecular hydrogen bonding with the ether group of ODA molecule meanwhile π-π stacking interaction could be formed among the aromatic rings of ODA and the aromatic section in the backbone of C-PEI. The separation efficiency of the synthesized polyetheramide TFC membranes was assessed with some organic solvents and characterized through ATR-FTIR, 13 C NMR, XPS, SEM, DBES, etc. S parameters of DBES measurement indicate that the organic solvent activation indeed influences the arrangement of the polymer chain in the synthesized membrane layers, and consequently makes the diffusion faster through the top layer of the membrane. Through activating the TFC membrane by THF solvent, the optimum TFC membrane showed a rejection of 96.3% toward Crystal Violet (CV) (Mw 407.98 g mol −1 ) with a THF permeance around 4.5 L m −2 h −1 bar −1 .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 2
·230-241
·
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
·
高分子化学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Huan Li,Yingying Li,Yudan Wang,Lijia Liu,Hongxing Dong,Chunhong Zhang,Toshifumi Satoh
Flexible and self-healing conductive hydrogel, as a typical electronic skin with the function of transmitting sensory signals, has attracted remarkable attentions in the biomaterials field. However, the practical application of electronic skin has been severely limited owing to the potential bacterial infection threats. Here, in order to improve the antibacterial properties of electronic skin, a star-shaped polyetheramide (Tyr-PEAm) derived from L-tyrosine was synthesized and cross-linked into the hydrogel network. A compliant and self-healing conductive hydrogel (defined as PVA/PDA/Tyr-PEAm) was assembled from polyvinyl alcohol (PVA), polydopamine (PDA) and Tyr-PEAm. The hydrogel achieved a comprehensive performance of long-term antibacterial activity (the inhibition zones remained unchanged over 7 days), low hemolysis activity (hemolysis rate of 0.042 %), good conductivity and rapid self-healing ability (healing within 1 s). Therefore, the hydrogel could be used not only as a detection device to check normal skin, but also as the wound skin detection in real time. Furthermore, the good conductivity and rapid self-healing ability contributed to the hydrogel to detect various macro and micro movements of the human body, as well as to recycle as a new sensor. The PVA/PDA/Tyr-PEAm hydrogel that integrated intelligent signals and resisted bacterial infections exhibited broad application prospects in biomedical materials.
研究领域:
生物材料学
·
医学工程
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）