INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Yijian Wu,Hui Zhang,Baoqing Shentu,Zhixue Weng
Organo-montmorillonite (OMMT) was introduced into SEBS-g-MA toughened poly(phenylene oxide)/polyamide-6 (PPO/PA6) blends simply by melt extrusion. The effects of OMMT on morphology, rheology, and mechanical behaviors of toughened PPO/PA6 nanocomposites were studied by scanning electron microscope, transmission electron microscope, capillary rheometer and mechanical tests. The addition of OMMT could decrease the size of dispersed PPO domains in PA6 matrix and melt viscosity of the toughened PPO/PA6 nanocomposites. Besides, exfoliated OMMT also brought significant improvement of tensile properties and heat deflection temperature (HDT), simultaneously. For nanocomposites with exfoliated OMMT, OMMT induced more core–shell toughening particles with the optimized size, and thus, elastomer-OMMT synergistic toughening was achieved in the PPO/PA6 nanocomposites. Consequently, PPO/PA6 nanocomposites with high tensile strength, excellent impact performance, improved HDT, and good processability were obtained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Guangbo Zeng,Dongqing Zhang,Liuming Yan,Baohua Yue,Ting Pan,Yidong Hu,Shufa He,Hongbin Zhao,Jiujun Zhang
Side-chain optimized poly (2,6-dimethyl-1,4-phenylene oxide)- g -poly (styrene sulfonic acid) (PPO- g -PSSA) is designed with balanced water-resistance and sulfonation degree. The PPO- g -PSSA is synthesized by controlled atom-transfer radical polymerization (ATRP) from brominated poly (2,6-dimethyl-1,4-phenylene oxide) (PPO- x Br) and ethyl styrene-4-sulfonate and followed by hydrolysis. A series of PPO-g-PSSA are prepared possessing different bromination degree (x) of PPO-xBr and polymerization degree (m) of the side-chains and the water-resistances of the fabricated membranes are investigated. The results show that a PPO-g-PSSA at relatively low x (x < 0.2) and high m (m > 4) exhibits good balance between the water-resistance and the sulfonation degree. Namely, it displays suitable proton conductivity with compromised water-resistance. Moreover, a maximum ion exchange capacity (IEC) of 3.24 mmol g −1 is reached without the sacrifice of water-resistance. In addition, PPO-g-0.08PSSA-13 and PPO-g-0.14PSSA-4 are chosen characterized by thermogravimetric analysis , proton conductivities and mechanical properties. At 90% RH, the optimized PPO-g-0.08PPSA-13 possesses a proton conductivity of 37.9 mS cm −1 at 40 °C and 45.5 mS cm −1 at 95 °C, respectively.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Ling Yuan Liao,Wen Hong Ruan,Ming Qiu Zhang,Li Weihao
The 5th generation mobile communication technology (5G) requires materials with high reliability, high dimensional stabilities, and low dielectric constant (Dk) and low loss factor (Df). However, achieving both high dimensional stabilities and low dielectric is difficult. In this work, we propose a strategy to improve dimensional stabilities of printed circuit board (PCB) substrates without reducing their dielectric properties by introducing crosslinking agents with trifluoromethyl groups and allyl groups to polymers. Polyphenylene oxide (PPO) was selected as the representative research object, and a series of cured PPO-Allyl-F with varying contents of trifluoromethyl and allyl side chains were designed and synthesized. The molecular structures of the thermosetting PPO were characterized using 1H nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FTIR) spectroscopy. The isothermal curing kinetics of the thermosetting PPO were monitored with in situ FTIR. The thermal stability, mechanical properties, glass transition temperature (Tg), coefficient of thermal expansion (CTE), and dielectric properties of the cured PPO-Allyl-F materials were investigated in detail. The results show that the obtained thermosetting PPO with improved dimensional stabilities and low dielectrics has great potential for the application in high-frequency electronic circuits. This work provides a new approach for developing high-performance polymers that can address the contradiction between dielectric properties and dimensional stability.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zeming Fang,Xiaotao Zhu,Ying Yi,Qianfa Liu,Ke Wang
Ultralow-loss thermosetting resins cured via free-radical polymerization have been extensively applied as the polymeric matrix in high-frequency and high-speed printed circuit boards and electronic packaging substrates. In recent years, silicon doping has been commonly acknowledged for its potential to reduce the dielectric loss of materials. Three silicon-containing cross-linkers are investigated in this work for use in ultralow-loss thermosetting poly(phenylene oxide) (PPO) materials. The study compares the influence of these silicon-containing cross-linkers with two commercially available cross-linkers, focusing on their effects on curing temperature, dielectric properties, thermal characteristics, moisture resistance, and aging resistance. Silicon-containing cross-linkers showed appropriate reaction temperatures that were comparable to that of conventional epoxy materials. More importantly, they decreased the dielectric loss of cured samples with the lowest dissipation factor (Df) value of 0.00159 at 10 GHz. The addition of silicon atoms also slowed the deterioration of dielectric properties during high-temperature aging experiments and reduced moisture absorption in PPO samples. However, there are also concerns regarding the reduction in the glass-transition temperature and the increase in the coefficient of thermal expansion. These results demonstrate the promising potential of silicon-containing cross-linkers in enhancing the performance of ultralow-loss PPO materials for advanced electronic packaging applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 12
·47231
·
IF 1.901
Da Shen,Li Yuan,Guozheng Liang,Aijuan Gu,Qingbao Guan
The development of an energy-efficient strategy to prepare thermally resistant damping materials with high damping capacities (tan δ values) and broad effective damping temperature ranges (Δ T s) at high temperatures (>150 °C) is still an interesting challenge. In this study, a graft copolymer (PSi- g -APPO) was synthesized through the reaction between hydrogen-terminated fluorosilicone and allyl poly(phenylene oxide) (APPO), and a unique kind of photocrosslinkable film (coded as GFA) consisting of FSR, APPO and PSi- g -APPO was prepared. The resultant GFA has high thermal resistance, wide Δ T , and high tan δ. When the weight ratio of APPO to FSR to PSi- g -APPO was 81:9:10, the obtained film exhibited a broad Δ T of 64 °C and a high tan δ (≤1.01) from 157 to 221 °C; this was the best comprehensive performance among the GFA systems. The mechanism behind the excellent integrated performance of GFA was studied and was proven to be due to the unique structure of the heterogeneous GFA system. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47231.
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
·
2017
·Vol. 135
·期 12
·46034
·
IF 1.86
Jiqin Chen,Chunhui Shen,Shanjun Gao,Yuan Yuan,Xuechao Ren
Novel organic–inorganic hybrid membranes, based on poly(2,6-dimethyl-1,4-phenylene oxide), have been prepared through 1,2-dimethylimidazole functional groups and double crosslinking agents including 3-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate by sol–gel process for the purpose of improving the conductivity and alkaline resistance. The structure of membranes was characterized using Fourier-transform infrared spectra, 1 H NMR, and X-ray diffraction. The physico-chemical properties of all membranes were shown in ion exchange capacity, water uptake, stability, and conductivity. Membranes with OH – conductivity up to 0.022 at 25 °C and 0.036 S cm −1 at 80 °C. Promisingly, the chemical stability of the resulting membranes remains unchanged after storage in 2 mol dm −3 KOH at 25 °C over at least 10 days. The tensile strength can be higher than 30 MPa, and the elongation at break (Eb) is in the range 6.68–10.84%. Hence, this hybrid membrane can be potentially applied in alkaline fuel cells. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46034.
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
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Chen Xiao Lin,Yi Zhi Zhuo,Ao Nan Lai,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
A series of novel side-chain-type anion exchange membranes (AEMs) composed of poly (arylene ether sulfone)s backbone and pendent imidazolium-functionalized polyphenylene oxide (PPO) was prepared via chemical grafting, bromination, functionalization and alkalization. The chemical structure of the as-synthesized copolymers was confirmed by 1 H NMR spectroscopy . Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to observe the morphology of the AEMs. The densely functionalized side chains are found to be beneficial to the formation of ion clusters, as demonstrated by TEM. As a result, the hydroxide conductivity of the PAES-x-IMPPO membranes was 78.8 mS cm −1 at 80 °C. Moreover, the AEMs also exhibit robust mechanical properties , good thermal stability and reasonable alkaline stability. An open circuit voltage (0.98 V) of H 2 /O 2 alkaline fuel cell using PAES-15-IMPPO at 60 °C can be an indicative of low fuel crossover. The maximum power density was 56.8 mW cm 2 at a current density of 125 mA cm 2 without optimization.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Minhui Liang,Jinwu Peng,Kaiyue Cao,Cengliang Shan,Zhenchao Liu,Peng Wang,Wei Hu,Baijun Liu
A bulky and hydrophilic β-cyclodextrin group, serving as a “performance assisting moiety”, was grafted onto a poly(phenylene oxide) (PPO) to achieve a new family of polymer electrolytes with different kinds of quaternary ammonium salts (QAs) for anion exchange membranes (AEMs). It was observed that the β-cyclodextrin involved AEMs having a well-designed molecular architecture exhibited some attractive properties. At the same ion exchange capacity level, the highest conductivity at 80 °C of the cyclodextrin-involved anion exchange membranes reached 110.8 mS cm −1 , which was almost twice as high as that of a reference membrane. As a novel “assisting moiety”, the incorporation of the functional cyclodextrin groups also endowed membranes with suitable water uptakes of 60.2–93.8% and swelling ratios of 11.5–22.8% at 80 °C. A comparative study revealed that the cyclodextrin-involved membranes had an improved alkaline stability and a satisfactory cell performance. The maximum power density of one cyclodextrin-based membrane was 154 mW cm −2 , which was three folds higher than that of the analogue without “assisting moiety”. In general, this study offers an effective synthetic strategy to prepare the high-performance anion exchange membranes with an excellent combination of high conductivity, low swelling, good alkaline stability and reasonable cell performance.
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
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 5
·1-11
·
IF 1.92
Li Zhi-min,Zhang Gang,Li Yan,Yang Jie
The homo- and co-poly(p-phenyene ether sulfone benzimidazole/sulfide sulfone benzimidazole)s (PESI/PPSSI) had been prepared by solution polycondensation of the mixtures of 4,4′-dicarboxydiphenyl ether (DCDPE) and 4,4′-dicarboxydiphenyl sulfide (DCDPS) with 3,3′,4,4′-tetraanmino diphenyl sulfone (TADS) in polyphosphoric acid (PPA). The FT-IR, 1 H-NMR, DSC, TGA, XRD were used to characterize chemical structure and thermal stabilities of the resultant homo- and co-polymers. The inherent viscosities of the resultant polymers were in the range of 0.621–0.982 dl/g at the polymer concentration of 0.5 %. They were found to have excellent thermal properties with glass transition temperatures (T g ) of 386–393 °C, 5 % weight-loss temperature (T 5% ) of 512–525 °C. These polymers showed amorphous nature as charactered by XRD. Most importantly, the resultant polymers possess good solubility that they can be soluble in various aprotic solvents such as N-methyl-2-pyrolidinone (NMP), dimethyl sulfoxide (DMSO) and 1,3-dimethyl-2-imidazolidinone (DMI) and they could be easily formed transparent, tough and flexible membranes by solution casting method. The membranes showed good mechanical properties: the tensile strengths and Young’s Modulus were in the range of 68.8–98.6 MPa and 2.1–2.8 GPa, respectively.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Xiaowei Wu,Zeming Fang,Xiaotao Zhu,Cheng Luo,Dan Li,Qianfa Liu,Ke Xue,Ke Wang
In high-frequency applications such as 5G-6G communication, internet of things, automotive radar, and automated driver-assistance systems, substrate materials excel as insulating layers owing to their superior dielectric properties. However, traditional methods for material development are often laborious and costly. To overcome these limitations, we employed molecular dynamics (MD) simulations to predict the dielectric properties of these materials at frequencies exceeding 10 7 Hz. Specifically, we selected thermosetting polyphenylene oxide (m-PPO) as the resin matrix and combined it with three crosslinking agents, respectively: triallyl cyanurate, triallyl isocyanurate, and trimethylallyl isocyanurate. Our overarching goal is to provide comprehensive insights into the development and enhancement of materials critical for high-frequency electronic devices. We anticipate that this methodology will be widely adopted for the development of advanced substrate materials across various applications, with the objective of effectively screening crosslinkers. Highlights Developed a simulation method to efficiently explore material scenarios for high-frequency applications. Studied the dielectric properties of m-PPO combined with three crosslinking agents at high frequencies. Successfully predicted dielectric properties using MD simulations.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yi Liu,Bang Lan,Wenhong Ruan,Mingqiu Zhang
Recently, soaring developments in 5 G technology have raised an intensive challenge in developing polymer composites with excellent thermal conductivity and dielectric properties . Herein, Al 2 O 3 @Si/MPPO composites were developed through synergistic modification and solution mixing methods. The double bond reaction between Al 2 O 3 @Si and MPPO enhanced the interfacial force and greatly reduced the interfacial thermal resistance and interfacial polarization, leading to highly thermally conductive composites with excellent dielectric properties. The resultant polymer composites exhibited high thermal stability, excellent dynamic mechanical properties, a low dielectric loss of 0.00292, and a high thermal conductivity (TC) of 1.49 W/(m·K), which was 5.21 times higher than that of the pure MPPO resin, making it an ideal thermal management material for electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Polymer-Plastics Technology and Materials
·
2020
·
IF 0
Shanshan Wang,Qifeng Li,Fanghui Wang
Designed and synthesized a series of imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) (Im-PPO) containing pendant imidazole groups, which were used to supply functional sites for acid–base interaction with the doping phosphoric acid. The imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) membranes obtained by the solution-casting method were doped with phosphoric acid (PA). The PA content, swelling, and tensile strength of the different membranes doped with PA were measured. With the increase of the length of side chains on the imidazole groups, the membrane showed different properties. The proton conductivity at a level of 3.7 × 10−2 S/cm was achieved at 160°C by the MeIm-PPO imidazolium composite membrane.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）