POLYMER
·
2026
·
IF 4.5
Juan Chen,Zheng Zhang,Seeram Ramakrishna,Zhonglin Xiang,Changhai Xu,Jinmei Du
Meta aromatic polyamide (PMIA) has high rigidity and low flexibility due to the rigid molecular structure and highly oriented hydrogen bonding interactions, which will make the stress concentration and damage of PMIA by force. It is necessary to improve flexibility while maintaining mechanical strength. The influence of different aromatic ether structure on properties of PMIA and the evolution mechanism of molecular chain conformation in flexible PMIA fibers during the drawing process are not clear. This work obtained two flexible PMIA fibers (PMAB-PMIA and ODA-PMIA) by introducing 1,3-bis (4-aminophenoxy) benzene (PMAB) and 4,4′-diaminodiphenyl ether (ODA) into molecular chain. The properties of PMIA with different aromatic ether structures and microscale analysis during drawing were explored. The flexible PMIA maintained excellent mechanical properties, thermal stability, and flame retardancy. The tensile strength of pristine PMIA, PMAB-PMIA and ODA-PMIA was 2.68, 2.55 and 2.64 cN/dtex, respectively, meaning that flexible PMIA fibers kept high tensile strength. Compared with pristine PMIA, the elongation at break of PMAB-PMIA and ODA-PMIA increased by 30.1 % and 16.4 %. Their maximum number of twists also increased from 177 to 237 and 258 twists/10 cm. The increased elongation at break and torsional resistance proved that flexibility of modified PMIA elevated. The molecular dynamics (MD) simulations indicated that the molecular chains of aromatic-ether PMIA had more folded conformations, thus offering superior flexibility and stress dissipation capabilities at microstructural level. This work systematically explored high-strength and flexible PMIA fibers based on aromatic ether, which is expected to guide the material design of future functional fibers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2026
·
IF 2.8
Zhoufeng Wang,Wenlong Yao,Wenchi Zhang,Puxi Zheng
Optically transparent amorphous copolyarylates based on tetramethylbisphenol A (TMBPA) and bisphenol B (BPB) were synthesized via low-temperature interfacial polymerization. These copolyarylates exhibited high solubility, with number average molecular weight ( M n ) of 1.48 × 10 4 –1.92 × 10 4 g/mol, weight average molecular weight ( M w ) of 6.64 × 10 4 –9.13 × 10 4 g/mol, polydispersity index (PDI) of 3.45–5.89, and intrinsic viscosity of 0.62–0.83 dL/g. Incorporation of TMBPA alters the thermal properties of the copolyarylates, decreasing thermal stability ( T 5% ) from 473.4°C to 444.4°C and char yield from 34.6% to 19.7%, but increasing the glass transition temperature ( T g ) from 202.9°C to 234.1°C. TG/FTIR and Py-GC/MS analysis revealed that methyl groups adjacent to the phenolic hydroxyl group promoted chain breakage and accelerated thermal decomposition. The main gaseous products included H 2 O, CO 2 , CO, CH 4 , and phenolic compounds. Tensile strength, tensile modulus, and elongation at break of copolyarylates ranged from 51.83 to 60.21 MPa, 1023.28 to 1283.14 MPa, and 32.9% to 53.6%, respectively. This study highlighted the solubility-thermal property balance, providing insights for designing processable high-performance polyarylates.
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高影响因子
ACS Omega
·
2026
·
IF 4.3
Mahmoud M. Abdelaty,Meshari D. Alanazi,Yun Zhao,Qingze Jiao
Poly(m-phenylene isophthalamide) (PMIA) is a high-performance polymer recognized for its outstanding thermal stability, mechanical strength, and chemical resistance, making it well-suited for advanced material applications. In this work, PMIA/graphene oxide (GO) nanocomposites were synthesized using an in situ interfacial polycondensation technique, with GO incorporated at varying loadings (1, 3, 5, and 7 wt %). GO was prepared via the modified Hummers method to ensure improved dispersibility and surface reactivity. Fourier transform infrared (FTIR) spectroscopy confirmed successful chemical interactions between GO and the PMIA matrix, while scanning electron microscopy (SEM) revealed a morphological transition from smooth to increasingly porous surfaces with higher GO contents. Thermal analysis showed enhanced thermal resistance, with the decomposition onset temperature increasing from 400 °C for neat PMIA to 457 °C at 5 wt % GO. Mechanical testing demonstrated that the 5 wt % GO composite exhibited the best tensile strength (32.5 MPa) and elongation at break (33.5%). Dielectric measurements indicated that all GO-filled composites had lower dielectric constants than pure PMIA, with the minimum value of 2.3 observed at 3 wt % GO due to optimized interfacial polarization at lower loadings. However, the 5 wt % GO composite provided the most comprehensive performance overall, as higher loading more effectively enhanced both thermal stability and mechanical reinforcement. These findings highlight the potential of PMIA/GO nanocomposites as promising candidates for advanced applications requiring superior thermal and mechanical performance along with low dielectric properties, including electronic insulation and membrane systems.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Xiao Zhen,Na Li,Junrong Yu,Zuming Hu,Yan Wang
Aramid fiber reinforced composites (AFRCs) are widely used in military, aerospace, and transportation applications. However, the non-recyclability and flammability of traditional epoxy-AFRCs remain significant challenges that limit their future developments. Herein, a flame-retardant and closed-loop recyclable crosslinked network based on poly-m-phenylene isophthalamide (PMIA) is reported for novel AFRCs. The deliberately incorporated phosphorus (P) element in thermally stable PMIA molecular chains, and the selected P and nitrogen riched aldehyde-cyclophosphazene crosslinkers endows the crosslinked P-containing PMIA (CCPMIA) with exceptional flame-retardant properties. The tailor-made P containing PMIA segments and optimized crosslinking ratio with crosslinkers also enable CCPMIA to exhibit excellent mechanical strength. The good interfacial compatibility between CCPMIA and para -aramid fibers confers comparable interfacial shear strength and mechanical properties of CCPMIA-AFRCs to those of traditional epoxy-AFRCs, while the highly flame retarding CCPMIA matrix significantly enhances the flame retardancy of CCPMIA-AFRCs with high limited oxygen index of 39.8% and the highest UL-94 rating of V-0. Additionally, the recycling of the CCPMIA matrix and para -aramid fibers without deterioration on intrinsic properties is achieved by exploiting the catalytic effect of water and heat on the reversible reaction of imine bonds, offering a facile way for the recycling of imine-based materials.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Zhoufeng Wang,Wenchi Zhang,Puxi Zheng,Hui Xu
A series of amorphous phosphorus- and fluorene-containing copolyarylates was synthesized via low-temperature solution polycondensation to elucidate the effects of phenylphosphonate incorporation on solubility, thermal properties, and degradation behavior. Increasing the phenylphosphonic dichloride (PPD) content improved solubility in DMF and DMAc and decreased the glass-transition temperature ( T g ) from 230.36 to 177.47°C. High initial thermal stability was retained under nitrogen, with T 5% and T 10% values of 487.66–493.67°C and 501.33–507.00°C, respectively. The residue at 800°C increased from 36.54% for AW20P0 to 41.61–44.06% for the phosphorus-containing samples under nitrogen and from 1.27% to 5.15% under air. Comparative pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) analyses of AW20P0 and AW20P20 at 500 and 550°C revealed similar backbone-derived aromatic product families but composition- and temperature-dependent redistribution of their relative abundances, indicating that PPD modifies concurrent degradation reactions rather than introducing an independent pathway. Thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) revealed changes in oxygen- and phosphorus-related volatile signals, whereas distinct molecular phosphorus-containing volatiles were not unambiguously identified by Py-GC/MS. X-ray photoelectron spectroscopy showed progressive surface phosphorus enrichment in residues collected after qualitative direct-flame exposure, while scanning electron microscopy revealed increasingly dense and continuous residue structures, with AW20P20 exhibiting an expanded closed-cell morphology. These results support a significant phosphorus-assisted condensed-phase contribution to residue formation, although the relative gas-phase and condensed-phase contributions remain quantitatively unresolved. The established structure–property–degradation relationships provide guidance for designing high-temperature copolyarylates with improved solubility and tunable degradation behavior.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Puxi Zheng,Zhoufeng Wang,Wenchi Zhang,Hui Xu
To address the limited solution processability and insufficient thermo-oxidative char stability of conventional polyarylates, a molecular structure regulation strategy was proposed in this work. A series of DOPO-HQ-containing copolyarylates were synthesized by incorporating 10 - (2,5 - dihydroxyphenyl) - 10H - 9- oxa-10-phosphaphenanthrene-10-oxide (DOPO-HQ) into the polyarylate backbone through solution copolycondensation. The chemical structures and copolymer compositions were confirmed by 1 H NMR, HSQC NMR, quantitative 1 H NMR, and FT-IR analyses, while GPC and XRD were used to characterize the molar-mass parameters and amorphous structures, respectively. Thermal analysis showed that DOBA-20, prepared with 20 mol% DOPO-HQ in the total bisphenol feed, exhibited a glass transition temperature of 194.9 °C and a char yield of 38.3% at 800 °C under nitrogen. More importantly, DOBA-20 retained a char yield of 32.7% at 800 °C under air atmosphere, far exceeding that of the DOPO-HQ-free polyarylate, DOBA-0 (0.04%), indicating significantly enhanced char stability under oxidative conditions. TG-FTIR and Py-GC/MS analyses, together with XPS and SEM analyses of char residues, demonstrated that DOPO-HQ mainly promoted the retention of phosphorus species in the condensed phase, facilitating the formation of a continuous and compact phosphorus-rich char layer containing phosphate/pyrophosphate structures. This stable char layer could suppress heat transfer and oxygen diffusion, possibly accompanied by limited gas-phase inhibition. This work provides a molecular design strategy for regulating the thermal degradation pathway of polyarylates and improving their solution processability and thermo-oxidative stability.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 16
·1-14
·
IF 2.8
Abdelaty M.,Huanhuan Zhu,Ewais Hassan A.,Morsy Ahmed,Yun Zhao,Qingze Jiao
Poly (m-phenylene isophthalamide) (PMIA) is a high-performance polymer known for its exceptional thermal stability, mechanical strength, and chemical resistance, making it an ideal candidate for advanced material applications. This study presents the synthesis, characterization, and analysis of poly (m-phenylene isophthalamide) (PMIA)/SiO 2 nanocomposites and porous PMIA films. PMIA/SiO 2 nanocomposites were prepared using in situ interfacial polycondensation, incorporating 3-, 5-, and 7-wt% SiO 2 nanoparticles. Nanocomposite films were fabricated through a controlled casting method, followed by etching SiO 2 particles with hydrofluoric acid to create porous PMIA films. Enhancement of the PMIA/SiO 2 nanocomposites exhibited improved inherent viscosity, indicating high molecular weight and efficient polymerization. Fourier Transform Infrared (FTIR) spectroscopy confirmed the successful integration of SiO 2 into the PMIA matrix. Scanning Electron Microscopy (SEM) revealed uniform pore distribution in the porous films, with pore size increasing with higher SiO 2 content. Thermogravimetric analysis (TGA) demonstrated enhanced thermal stability of PMIA/SiO 2 composites, with degradation temperatures increasing from 440 °C for pure PMIA to 460 °C for composites containing 7-wt% SiO 2 . Mechanical testing indicated that PMIA/SiO 2 composites with 5-wt% SiO 2 achieved optimal tensile strength (31.8 MPa) and elongation at break (30.1%), while higher SiO 2 content resulted in reduced mechanical performance due to particle agglomeration. The dielectric constants of these porous films remained consistently lower than those of their nonporous counterparts throughout the frequency range of 1 Hz to 1 MHz. This work highlights the potential of PMIA/SiO 2 nanocomposites and porous PMIA films for advanced applications requiring thermal and mechanical resilience, with tunable properties achieved through SiO 2 content variation.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shuhao Wang,Shaosuo Bing,Haoyong Zhang,Yong Zhou,Lin Zhang,Congjie Gao
Tailoring excellent polyamide (PA) seawater reverse osmosis (SWRO) membranes for boron (B) removal is a key challenge. Herein, we developed a facile surface engineering design strategy to improve the boron removal and desalination performance of SWRO membranes by controlling the reaction kinetics of interfacial polymerization. The functional groups and density of the oligomers covering the surface of PA skeleton were tuned to reduce the pore size and hydrogen bonds interaction inside the PA active layer with an enhanced the selectivity of the membranes. The designed membrane exhibits a high boron removal rate of 95.34%, while displaying a NaCl rejection of 99.8% and an acceptable water flux. This work offered a basic framework for the design of outstanding SWRO membranes, and also provided some insights for the formation and structure-property relations of polyamide membranes based on interfacial polymerization.
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高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Chengdong Guan,Lijuan Yang,Lijun Zhu,Daohong Xia
The fabrication of membranes with the advantages of simple operation and high separation efficiency is considered of great importance to meet the separation challenge of the oil-in-water emulsions produced in various types of industries. Along these lines, in this work, a membrane with a biomimetic gracilaria surface was ingenious designed and manufactured by using poly-pseudorotaxane structured poly ( m -phenylene isophthalamide) (PMIA) for attaining high efficiency of the oil-in-water separation. m-Phenylenediamine (MPD) included by γ-cyclodextrin (γ-CD) was also used to participate in the synthesis of PMIA and introduce more hydroxyl groups into the polymer chains. By the implementation of a non-solvent induced phase-inversion (NIPS) method, the superhydrophilic and the underwater superoleophobic γ-CD@PMIA membrane was successfully fabricated. Under the 0.05 MPa cross-flow filtration test, in addition to the high pure water flux (1366.69 L·m −2 ·h −1 ·bar −1 ) of the γ-CD@PMIA membrane, its separation efficiency for soybean oil-in-water emulsion was higher than 98.20 %. Moreover, during the application of the continuous separation process of up to 4 h, the membrane maintained a stable separation capacity for different oily wastewaters, which proved its good anti-pollution performance. Furthermore, the membrane exhibits good stability in harsh environments, which is of great significance for the future development of membranes with excellent chemical stability. Our work paves the way for the design of a novel biomimetic surface-based membrane with efficient oil-in-water emulsion separation properties.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liling Jing,Pengfei Yang,Xiaoli Lu,Haoran Tian,Jinlong Mao,Junying Li,Feng Ma,Zhiliang Zhang
It is still a huge challenge for industry to manufacture convenient and efficient oil-water separation materials. In this study, benzophenone derivatives with hydrophobic perfluorooctyl groups were synthesized as a crosslinking agent, so that the triplet photosensitizer of benzophenone could be inspired by UV light. Thus, hydrophobic groups were covalently grafted onto the surface of commercial filter papers under mild conditions, which had the advantage of easy availability, low cost, good biodegradability and chemical stability. The relevant reaction mechanism was proposed and confirmed. Moreover, these cellulose-based materials exhibit excellent hydrophobicity and lipophilicity in air, which was used for oil-water separation. The results showed that the modified filter paper was able to separate various oil-water mixtures and surfactant-stabilized water-in-oil emulsions that were driven by gravity in the absence of external stimulus. The findings of this study have significant implications to develop cost-effective low surface energy materials and surfaces, which is potentially possible for large-scale industrial applications.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3740-3749
·
IF 3.665
Tianwen Dai,Shuaiwei Yuan,Huawei Zou,Pengbo Liu
A kind of four-functional epoxy resin containing tertiary ester groups (FETE) was designed and synthesized by two-step reaction: first, the nucleophilic substitution reaction between linalool and isophthaloyl chloride, and then epoxidation. The chemical structure of obtained product was determined by infrared (IR) spectroscopy and nuclear magnetic resonance spectroscopy. Unlike traditional thermosetting epoxy resins, the cured FETE could degrade rapidly at low temperature (200–300°C). Dynamic mechanical analysis analysis showed that through copolymerization of FETE with (4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester) epoxy resin (TDE-85), the glass transition temperature (Tg) of copolymer system could be adjusted in the range of 136–179°C; FETE had good miscibility with TDE-85. The thermal degradation behavior of the copolymer system was studied by theoretical calculation, thermogravimetric (TG), and TG coupled with FTIR analysis, the results showed the thermal decomposition performance of the copolymer system could be adjusted in the range of 200–400°C. The tertiary ester groups in FETE were easy to thermally degrade and caused the network skeleton of the copolymer system to collapse. The FETE would have good prospects in reworkable electronic packaging, recycling or degradable epoxy resin area.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 6
·49792
·
IF 2.52
Rui Yang,Boran Hao,Lin Sun,Kan Zhang
In this study, an amide functionalized bis-benzoxazine (AI-al) has been synthesized using allylamine, ortho -amide functional bis-phenol and paraformaldehyde as raw materials via Mannich condensation. This newly obtained benzoxazine has been used to react with polydimethylsiloxane (PDMS) through hydrosilylation to form poly(benzoxazine- co -amide- co -siloxane) (AI-al-PDMS) featuring siloxane, amide and benzoxazine as repeating units. The chemical structures of both oxazine ring-containing monomer and copolymer are confirmed by NMR and FT-IR spectroscopies. Besides, the thermally activated polymerization behaviors of AI-al and AI-al-PDMS are investigated by DSC, and the subsequent conversion of benzoxazole formation is studied by in situ FT-IR. Moreover, dynamic mechanical analysis and thermogravimetric analysis are used to determine the thermal properties of the cross-linked polymers. The resulting cross-linked poly(benzoxazole- co -siloxane) derived from AI-al-PDMS shows excellent thermal stability (no T g can be observed before 400°C; Td5 of 393°C) and low dielectric constants (2.52–2.13 in the frequency range of 1 Hz to 1 MHz), evidencing its great potential applications in electronic packing, aerospace, and other high-performance fields.
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高影响因子
危险品化学品经营许可证（带存储）