HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Hailong Li,Sipei Zhao,Li Pei,Zihe Qiao,Ding Han,Zhanxin Liu,Qingsong Lian,Guizhe Zhao,Zhi Wang
Polybenzoxazines are emerging as a class of high-performance thermoset polymers that can find their applications in various fields. However, its practical application is limited by its low toughness. The cyclic β-cyclodextrin and a newly synthesized derivative (β-cyclodextrin-MAH) were separately blended with benzoxazine to improve the toughness of polybenzoxazine. The results revealed that the maximum impact strength of the blend was 12.24 kJ·m−2 and 14.29 kJ·m−2 when 1 wt.% of β-Cyclodextrin and β-Cyclodextrin-MAH, respectively, were used. The strengths were 53% and 86% higher than that of pure polybenzoxazine. The curing reaction, possible chemical structures, and fractured surface were examined using differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy techniques to understand the mechanism of generation of toughness. The results revealed that the sea-island structure and the presence of hydrogen bonds between polybenzoxazine and β-cyclodextrin and β-cyclodextrin-MAH resulted in the generation of toughness. Furthermore, the curves generated during thermogravimetric analysis did not significantly change, revealing the good thermal properties of the system. The phase-separated structure and the hydrogen bonds present in the system can be exploited to prepare synergistically tough polybenzoxazine exhibiting excellent thermal properties. This can be a potential way of modifying the thermoset resins.
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
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 4
·3057-3067
·
IF 11.806
Zhao Sipei,Li Shuiquan,Liu Huihui,Jiang Jin,Wang Meichen,Liu Haolang,Wang Weiwei,Wang Zhi
As a new thermosetting resin, polybenzoxazine has attracted extensive attention because of its excellent properties. However, the biggest challenge of polybenzoxazine is the balance among impact strength, thermal stability, and processability. In this work, we first introduced a 2-ureido-4[1H]-pyrimidone (UPy, containing quadruple hydrogen bonds) dimer into benzoxazine to tackle this challenge. In the blends containing 3 wt% UPy, its toughness and thermal properties have been simultaneously improved, while maintaining a high modulus and a negligible increasement in viscosity. The impact strength and the glass transition temperature ( T g ) reach 16.39 kJ·m −2 and 221 °C, which are 172% and 10 °C higher than that of polybenzoxazine, respectively. Meanwhile, this strategy was extended to carbon fiber surface modification to enhance the interfacial adhesion between fibers and resins. The mechanical properties of modified fiber composites are significantly improved. Furthermore, we firstly designed the cyclic flexural experiment of material and tried to propose an effective method to verify the effect of hydrogen bond dynamics on flexural properties of polybenzoxazine. Here, we not only provide a new way to get a balance among different properties of polybenzoxazine but also give a broad insight on the application of additional hydrogen bonds in thermoset resins. Graphical Abstract The improved comprehensive performances of polybenzoxazine were realized by introducing quadruple hydrogen bond motif.
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
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yi Wang,Wei Wu,Dietmar Drummer,Chao Liu,Wanting Shen,Florian Tomiak,Kevin Schneider,Xingrong Liu,Qiming Chen
To solve the heat diffusion problem in electronic packaging, a novel kind of irregularly shaped hybrid filler , boron nitride@copper (BN@Cu), was successfully assembled via reduction of Cu 2+ . BN@Cu hybrid fillers composed of different mass ratios between BN and Cu have been prepared and characterized. A specific BN@Cu hybrid filler (mBN:mCu = 100:2), labeled as BN@2Cu, exhibited remarkable ability in enhancing the thermal conductivity of polybenzoxazine (PBz) composites fabricated through ball milling followed by hot pressing. With 25 wt% of BN@2Cu hybrid fillers, the thermal conductivity of PBz composites reaches 1.049 W m −1 K −1 . Dielectric properties , electrical conductivity , and curing behavior of the composites were also investigated. In addition, Foygel's thermal conduction model was employed to demonstrate the mechanism of BN@2Cu hybrid filler in improving thermal conductivity.
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 Nano
·
2024
·
IF 8.2
Yanrong Liao,Sizhao Zhang,Zhouyuan Yang,Jing Wang,Shuai Yu,Haolin Zhang,Yunyun Xiao,Feng Ding
Polybenzoxazine (PBz) aerogels are promising high-performance, halogen-free flame-retardant thermal insulation materials in aerospace applications. But their widespread use is hindered by high costs, significant drying shrinkage, and poor machinability. Herein, we successfully addressed these challenges by developing PBz aerogel composites using a cost-effective ambient pressure drying method that reduces energy consumption and shortening the preparation cycle. This approach expands the range of available monomers, reduces the inherent rigidity of the network structure, and enhances processability. The resulting PBz aerogels demonstrate low drying shrinkage (as low as 5.68 %), lightweight properties (lowest to 0.322 g cm −3 ), excellent fire-retardant (self-extinguishing in 1.8 s), and exceptional thermal insulation performance (as low as 0.0402 W m −1 K −1 at room temperature and normal pressure). Further studies under various pressures show that at an atmospheric pressure of 10 Pa, the thermal conductivity at room temperature can reach as low as 0.027 W m −1 K −1 . Moreover, cryogenic treatment at −196 °C significantly enhances the compressive properties of PBz aerogels without inducing any noticeable shrinkage. Notably, PBz aerogels exhibit outstanding flame resistance, rated as nonflammable rating in vertical burning tests (UL-94, V-1 class), and showing a limiting oxygen index (LOI) as high as 33.7 %. Overall, these remarkable features underscore the exceptional potential of PBz aerogels as advanced thermal insulation materials in the aerospace industry.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Weiwei Wang,Haolang Liu,Li Pei,Huihui Liu,Meichen Wang,Shuiquan Li,Zhi Wang
While both polybenzoxazine and carbon fiber are attractive due to their excellent mechanical properties, polybenzoxazine suffers from low toughness, and carbon fiber has an inert surface. By incorporating newly designed and synthesized curcumin-based polyurethanes with varying chain lengths into polybenzoxazine (PU1.2 and PU2.0) and the surface of carbon fiber, we were able to introduce variable amounts of hydrogen bonds. Our modified polybenzoxazine exhibited enhanced mechanical properties, such as higher toughness and flexural strength of up to 16.0 kJ/m 2 and 147 MPa, respectively. In comparison, the flexural strength of our surface-modified carbon fiber reinforced benzoxazine composites was up to 537 MPa. Additionally, the improved mechanical properties of surface-modified carbon fiber reinforced polybenzoxazine are because curcumin-based polyurethanes can significantly improve the interfacial adhesion between the matrix and resin by introducing a soft layer with a high concentration of hydrogen bonds. Our study not only improved the mechanical properties of polybenzoxazine and carbon fibers reinforced polymer composites, but also revealed a novel method for enhancing the mechanical properties of thermosetting resins and interface adhesion of carbon fiber by regulating the hydrogen bonding content.
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 APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 19
·e53829
·
IF 3
Xin Kang Li,Jun Wei Shen,Hai Lan Lin,Zhao Xin Zhang,Xun Tao Zhang,Jun Bian,Dai Qiang Chen
In order to explore effective strategies to fabricate main-chain polybenzoxazine (PBZ) thermosetting resin for structural material applications, here, five PBZ with different molecular structures, that is, poly(Co-ddm), poly(Co-BPA-ddm-Co) main , poly(Ph-BPA-ddm-Co) main , poly(Ph-BPA-ddm-Ph) main and poly(Ph-ddm) were designed, synthesized and compared by introducing unsaturated fatty chains through the Mannich reaction with cardanol. The structure and properties of five PBZ with different structure were systematically investigated by using Fourier transform infrared (FTIR), NMR, water absorption and mechanical tests. FTIR and NMR tests indicated that five PBZ with different molecular structures were successfully synthesized. The mechanical tests indicated that the impact strength of the double-capped cardanol-based main-chain PBZ was 243% higher than that of the traditional PBZ. The water absorption of main-chain PBZ was higher than that of diamine PBZ, and the water absorption of poly(Ph-BPA-ddm-Co) main was the lowest in the main-chain PBZ. Based on the experimental results, five PBZ amorphous cells with different structures were successfully established. It indicated that the main chain PBZ showed better thermomechanical properties than the traditional diamine PBZ due to high crosslinking conversion and hydrogen bond density. Moreover, the modulus and glass transition temperature of the main chain structure containing unsaturated fatty chains did not decrease significantly.
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. 131
·期 19
·
IF 1.64
Huachuan Zhang,Min Li,Yuyuan Deng,Chengxi Zhang,Qichao Ran,Yi Gu
In this article, a kind of styrylpyridine-containing polybenzoxazine was obtained via the Knoevenagel reaction between benzaldehyde and methylpyridine groups. The benzoxazine monomer (MPBC) containing the benzaldehyde and methylpyridine groups was synthesized firstly and its structure was characterized by Fourier transform infrared (FTIR) spectra, 1 H NMR and 13 C NMR. With the aid of differential scanning calorimetry, FTIR, and photoluminescent tests, the interesting curing behaviors were probed. The results showed that the ring-opening polymerization occurred at lower temperature, and the Knoevenagel reaction further took place at elevated temperature. The amine and phenol moieties were bonded together to form the styrylpyridine structure. Due to these special crosslinking structures, the corresponding polybenzoxazine exhibited excellent thermal stability, and had a special high char yield of 74.5%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40823.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Shixian Xiong,Yue Yang,Sizhao Zhang,Yunyun Xiao,Hui Ji,Zhouyuan Yang,Feng Ding
Phenolic-based aerogel composites possess particular characteristics, such as low thermal conductivity, light weight, and superior ablative properties, in near-space vehicles. However, their machinability and flammability require further improvement, hampering their application for high-performance thermal protection systems in the aerospace field. Here, we prepare nanoporous polybenzoxazine (PBO) aerogels with outstanding thermally insulating and self-extinguishing properties by an effective-cost ambient pressure drying (APD) approach rather than a conventional high-pressure supercritical drying pattern. The PBO aerogels are prepared by adopting different exchange solvents of tert-butyl alcohol, ethanol, and n-hexane. The results obtained indicate that PBO aerogels (with n-hexane as the exchange solvent) by APD have an optimal three-dimensional nanoporous network structure, a pore size distribution in the range 20–140 nm, an obvious self-extinguishing property (extinguished itself instantly despite exposure to a 1200 °C flame), superior thermal insulation (the cold surface temperature of the sample reached only 36.4 °C after 400 s despite its opposite surface existing at a 65.8 °C atmosphere), and excellent machinable properties (easy-to-form special-shaped sample). PBO aerogels are a great potential candidate material system for thermal protection systems in aerospace applications in the future.
研究领域:
材料科学
·
航天工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Sizhao Zhang,Jing Wang,Kunming Lu,Guangyu Xu,Zhao Wang,Yunyun Xiao,Hui Ji,Zhouyuan Yang,Yue Yang,Shixian Xiong,Zhengquan Li
Polybenzoxazine (PBZ) aerogels are potential thermal insulation and ablative material for thermal protection system in aerospace. However, obtaining the excellent properties of thermal insulation and compression strength remain a formidable challenge at an extreme temperature. Here we proposed a new strategy by optimizing the nanoporous networking structure and pore size distribution to prepare PBZ aerogel (PAs-Fx), which could be self-extinguished in 0.24 s only once departing the outer flame, and the compressive stress of PAs–F10 reached up to 6.62 MPa at the strain of 10%. PAs–F10 presented great advantage in thermal insulation property (although the hot surface existed in the atmosphere at 302.4 °C, the temperature of cold surface remained at only 112.4 °C when heat flow was stable). Even burning the hot surface with 1200 °C outer flames for 30 min, the highest temperature of the cold surface only reached 254 °C at the heat balance state, moreover, the prominent shape-keeping property was confirmed after ultra-high temperature burning. We also found that PAs–F10 has superior compressive strengths which are 5.52 and 9.38 MPa at 10% strain in the conditions of ambient temperatures for 150 and −50 °C, respectively. PAs-Fx could also retain the excellent compression property after treating cryogenically in liquid nitrogen (−196 °C). The work would be a great promise in the application of ablative thermal insulation materials in a great measure in the future.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 12
·1-14
·
IF 2.8
Du Yonggang,Zhu Yongfei,Li Yuxuan,Xiao Jianrui,Wang Zhi
To develop a durable superhydrophobic cotton fabric (CF) for effectively separating oil/water mixtures, a pyrogallol-based polybenzoxazine with abundant hydroxyl groups (PPG-D) and Fe 3 O 4 were adopted to decorate CF. Meanwhile, a commercial benzoxazine based on bisphenol A and aniline (BA-a) was also incorporated to enhance the application potential of superhydrophobic CF. As expected, a durable superhydrophobic cotton fabric (PPG-D@PBA-a@Fe 3 O 4 @CF) with a water contact angle (WCA) of 154° was successfully fabricated via a facile dip-coating method. PPG-D@PBA-a@Fe 3 O 4 @CF not only could effectively separate immiscible oil–water mixtures with a high permeation flux of up to 12207 L/m 2 h and separation efficiency of above 98.8%, but also displayed a satisfactory separation ability for surfactant-stabilized water-in-oil emulsions with a separation efficiency of over 99.8% and high flux in the range of 4971–8281 L/m 2 h, and the modified CF remained a superior separation efficiency and flux even after 20 separation cycles. In addition, PPG-D@PBA-a@Fe 3 O 4 @CF also displayed outstanding mechanical and chemical stability as well as excellent self-cleaning ability, and the WCA of modified CF could reach 148° even after 100 abrasion cycles. These excellent characteristics make PPG-D@PBA-a@Fe 3 O 4 @CF have a promising application in oil–water separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 3
·842-851
·
IF 1.1
Zhu Yongfei,Li Yuxuan,Xiao Jianrui,Li Jiayi,Yu Shujuan
Separating oil/water mixtures via superhydrophobic stainless steel mesh (SSM) is a kind of efficient methods of treating oily wastewater, and the superhydrophobic SSM with a low cost, simple fabrication process and robust usability remains a challenge. Herein, urushiol-based benzoxazine (U-D) with a strong substrate adhesion and low surface free energy was used to anchor SiO 2 particles on the SSM surface to obtain a durable superhydrophobic SSM (PU-D/SiO 2 /SSM) through a simple dip-coating process, meanwhile, epoxy resin was also introduced to further improve the adhesion between coating and SSM. PU-D/SiO 2 /SSM could successfully separate various immiscible oil-water mixtures with a separation efficiency of over 96% and a flux up to 27 100 L/m 2 h only by gravity, respectively. Especially, the modified SSM could effectively remove water from water-in-oil emulsion with a separation efficiency of 99.7%. Moreover, PU-D/SiO 2 /SSM had an outstanding reusability, whose water contact angle and separation efficiency only slightly decreased after 20 cycles of separating oil/water mixture. In addition, the modified SSM also displayed a satisfactory abrasion resistance, chemical stability and self-cleaning property. Thereby, the robust PU-D/SiO 2 /SSM prepared by cheap raw materials and facile dip-coating method exhibits a high potential for separating oil/water mixtures.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Zhenhao Yao,Yichen Jing,Jianan Song,Kan Zhang
Multifunctional polymer-based composites with enhanced thermal conductivity are indispensable for achieving advancements in both scientific research and technological innovation. This paper reports a new type of polybenzoxazine/graphene (PBZ/GN) thermal conductive composite. Specifically, GN forms a continuous thermal conductive network by coating resin monomer powder and then undergoing hot-pressing curing. Upon incorporating 10 wt% GN, the PBZ composite exhibited distinct anisotropic thermal conductivities of 0.82 W/m K in the through-plane direction and 1.96 W/m K along the in-plane orientation. Compared with pure PBZ, these values represent increases of 1.6- and 5.3-fold, respectively. The composite material exhibits enhanced thermal stability as GN content increases. However, the mechanical properties exhibit an initial increase followed by a decrease. Notably, with the addition of 2 wt% GN, the tensile strength and flexural strength increase by 75.4% and 41%, respectively. This composite material can be prepared in a simple and highly efficient manner. Consequently, this advancement broadens the applicability of benzoxazine resins, especially in fields requiring high thermal stability and heat dissipation. Highlights A graphene network was designed to enhance composite properties. Enhanced thermomechanical properties achieved through graphene-induced thermal conduction networks. Peak strength gains (75.4% tensile/41% flexural) achieved with adding 2 wt.% graphene.
研究领域:
材料科学
·
复合材料工程
✓ 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）