JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 10
·49970
·
IF 2.52
Zhijia Zhang,Hao Jiang,Rui Li,Shan Gao,Qiang Wang,Guojun Wang,Xiao Ouyang,Hao Wei
The high-damping property of polyurethane elastomers and the low density of the hollow glass microspheres (HGM) were used to prepare the sound insulation materials in the present work. The transmission loss (TL) was measured to evaluate the HGM content on the sound insulation properties. The experimental results showed that the addition of HGM improved the hardness and compression modulus of the HGM-filled polyurethane composites, and the loss factor (tan δ ) of polyurethane composites were greater than 0.9. The average transmission loss (ATL, from 63 to 6300 Hz) reached 37.32 dB when the content of HGM was 10 wt%. The ATL of the HGM-filled polyurethane composites with 15 wt% HGM in the damping control region and the mass control region were 31.94 and 46.78 dB, respectively. The synergistic effect of the microphase separation, the interfacial effect and the rigidity of polyurethane composites resulted in the improvement on sound insulation property. The polyurethane composite has a great potential application for the field of sound insulation materials.
研究领域:
材料科学
·
声学工程
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 7
·2816
·
IF 3.4
Ning Wang,Hai Chang,Chi Zhang,Yingna Wu,Rui Yang,Xing Zhang,Zirong Zhai
Maintaining sufficient uniformity and stability of a ceramic slurry throughout the printing cycle is key to ensuring the performance of ceramic parts in ceramic-slurry stereolithography. In this study, a stable three-dimensional network structure was introduced into a slurry to achieve slurry uniformity and stability based on rheology theory. The effects of the particle size, solid loading, dispersant content, and gelling agent content on the stability of the three-dimensional network structure in the slurry were analyzed. Relatively stable three-dimensional network structures were constructed to achieve 4-week stability of micron- and submicron-size particle slurries by adjusting the contents of the dispersant and gelling agent. Stabilization ideas for different particle size ranges are provided. In addition, an empirical stability model was obtained based on the experimental results. When the predicted empirical stability factor ofAwas less than 0.035, the slurry exhibited good stability.Keywords:stereolithography printing;slurry stability;rheology;loss factor;gel behavior
研究领域:
材料科学
·
3D打印
·
流变学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Quan,Li Lei,Shuimiao Xia,Qinyang Tang,Zelong Chang,Linwei Zhu,Davoud Dastan,Zhicheng Shi
Polymer composites filled with conductive fillers have been proven to have ultra-high effective permittivity near percolation, but they usually have high dielectric loss due to the easy contact between the conductive fillers. Herein, a polymer composite with a three-dimensional BaTiO 3 ceramic skeleton loaded with gold nanoparticles, which effectively avoids the direct contact of gold nanoparticles, is proposed. Benefiting from numerous equivalent micro-capacitors and the Coulomb blockade effect of gold nanoparticles, obviously enhanced permittivity and low loss are concurrently achieved. Particularly, with a gold sputtering time of 12 min, a high permittivity of 47.7@10 kHz, which is approximately 454 % (i.e. from 8.2 to 47.7@10 kHz) of the PVDF matrix, is achieved in the composite. Meanwhile, a low loss of about 0.032, which is merely about 65 % that of pure PVDF ( 0.0492@10 kHz) is maintained. This work provides an effective approach for designing polymer composites with high permittivity and low loss.
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
RSC Advances
·
2018
·Vol. 8
·期 23
·12494-12502
·
IF 2.936
Wenchao Xue,Hua Li,Roberto Dugnani,Hafeez Ur Rehman,Chunmei Zhang,Yujie Chen,Hezhou Liu
In this study, a lead zirconate titanate (PZT)/in situ polymerized polyurethane (PU) composite with three-dimensional (3D) reduced graphene oxide (rGO) as the conductive phase was prepared and the potential of 3D rGO to enhance the damping properties was investigated. The conductivity and damping properties of the composite were systematically investigated. The results show that the conductive threshold of the composite is reached at a very low rGO content of about 0.7 wt% by using the 3D rGO structure. The best damping performance of the piezoelectric damping composite is achieved at the conductive threshold, where the loss factor is 0.22 (almost 41%) higher and the temperature range where tan δ ≥ 0.3 is 13.2 °C (almost 84%) wider than those of the PU matrix. A composite consisting of only PU and rGO sheets without the 3D structure was prepared for comparison. The conductive threshold of this composite is more than 0.9 wt% and the highest tensile strength is 5.63 MPa when the rGO content is 0.6 wt%, indicating that the 3D structure reduces the use of the conductive phase and does not significantly affect the tensile strength of the matrix.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 1
·419-429
·
IF 3.348
Tianwen Dai,Xinyue Jiang,Ying Ge,Huawei Zou,Pengbo Liu
Through the redistribution reaction of PPO, the hydroxyl-terminated low molecular weight PPO (PPO-OH) was prepared. Furthermore, after the reacting of PPO-OH with methacrylic anhydride, the double-bond-terminated low-molecular weight PPO (R-PPO) were synthesized, its M n was 2631 g/mol. The R-PPO were co-cured with epoxidized polybutadiene (JP-100) to prepare JP-100/R-PPO cured systems. The JP-100/R-PPO cured systems showed single-phase morphology. The co-curing reaction with R-PPO could effectively improve the thermal performance of JP-100, the glass transition temperature ( T g ) of cured JP-100/R-PPO systems raised greatly. For the cured JP-100/R-PPO (100/30) system, its T g was 192°C. The dielectric constant and dissipation factor of cured JP-100/R-PPO systems were both decreased and showed good frequency stability. The dielectric constant and dissipation factor at 1 MHz of cured JP-100/R-PPO (100/30) system were 2.61 and 0.0038, respectively, were obviously lower than those of cured JP-100 system (which were 3.10 and 0.0099, respectively). The JP-100/R-PPO systems exhibited an excellent thermal stability. The 5% weight loss temperature ( T 5% ) of cured JP-100/R-PPO system was around 340°C.
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 MATERIALS SCIENCE
·
2018
·Vol. 53
·期 18
·13230-13242
·
IF 2.993
Zhang Chao,Shi Zhicheng,Mao Fan,Yang Chaoqiang,Yang Jie,Zhu Xiaotong,Zuo Heng
Polymers with high dielectric constants are widely used in electronic devices and electric systems. However, polymers exhibit low dielectric constants, which greatly limit their applications. Currently, ferroelectric ceramic fillers and conductive filler are commonly filled into polymer matrix to achieve enhanced dielectric constants. Unfortunately, even though the loading fraction of ferroelectric ceramic fillers exceeds 50 vol%, the enhancement of dielectric constant is still limited. On the contrary, although ultrahigh dielectric constant could be realized in conductor/polymer composites containing small loading fractions of conductive fillers, the loss is usually very high owing to severe leakage conduction. To overcome the shortcomings of the above-mentioned two types of high dielectric composites, this work combined them together and designed a series of trilayer polymer composites consisting of one carbon nanotube/polyimide composite layer sandwiched by two BaTiO 3 /polyimide composite layers. Fortunately, the trilayer architecture could effectively overcome the drawbacks of carbon nanotube/polyimide and BaTiO 3 /polyimide single-layer composites, hence the balanced dielectric constant and loss. When the BT content of the outer layer is 50 wt% and the carbon nanotube content of the middle layer is 4 wt%, the trilayer film possesses a high dielectric constant of ~ 35 @10 kHz, which is about 700% over pristine PI matrix ( ε′ ≈ 5 @10 kHz). Meanwhile, the loss tangent of the trilayer composite (tan δ ≈ 0.03 @10 kHz) is still comparative to pristine PI (tan δ ≈ 0.01 @10 kHz).
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
Advances in Materials Science and Engineering
·
2018
·Vol. 2018
·期 1
·1253635
·
IF 1.372
Shiyue Pan,Meijuan Li,Fei Chen,Zhixiong Huang,Qiang Shen,Lianmeng Zhang
New types of piezoelectric damping materials, including carbon nanotubes (CNTs)/lead magnesium niobate (PMN)/epoxy (EP) resin, are developed. The tan δ area (TA) analysis method is selected to evaluate the damping properties which obviously clarifies the effect of maximum loss factor (tan δ ) and effective temperature range on damping properties. Furthermore, the dominant factor of damping enhancement is quantitatively analyzed via the value of TA. Compared with PMN, the interfacial friction of CNTs acts as the dominant factor for the content less than 0.6 wt.%. The maximum damping percentage of CNTs reaches 29.14%. CNTs form loop circuits gradually with the content of CNTs increasing, and electrical energy generated via piezoelectric effect of PMN is efficiently dissipated through the conductive network. Thus, PMN becomes the dominant factor as the content of CNTs exceeds 0.8 wt.%, and the damping percentage reaches 47.43% at the content of CNTs of 1.0 wt.%.
研究领域:
材料科学
·
高分子复合材料
·
功能材料
·
智能材料
·
力学性能
·
电学性能
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 69
·期 3
·228-238
·
IF 2.433
Jing-hui Yang,Ting-ting Zhang,Yong-sheng Zhang,Nan Zhang,Ting Huang,Yong Wang
Carbon nanotubes (CNTs) and barium titanate (BaTiO 3 ) (BT) were simultaneously introduced into the immiscible blend poly(ethylene- co -vinyl acetate)/thermoplastic urethane (EVA/TPU), and the EVA/TPU/CNT/BT quaternary polymer composite blends with core–shell structured island TPU domain were successfully prepared, in which CNTs in the TPU domain act as the core and the BT spheres at the interface of the TPU and EVA act as the shell. A core–shell structured island can lead to the formation of micro-capacitors and further accumulate electron storage owing to the incorporation of CNTs and BT; on the other hand, a BT shell can be assembled along the TPU spheres, reducing the possibility of formation of a conductive CNT network, resulting in suppressed dielectric loss. Therefore, CNTs and BT were tailor-made into blend composites with a core–shell structured domain, which can achieve an increased dielectric constant by 176% and decreased low dielectric loss by 80% compared with the blend composites with only CNTs in the TPU domain. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 14
·3117
·
IF 5
Shihao Zhou,Yuanchang Lai,Junchi Ma,Bin Liu,Nannan Ni,Feng Dai,Yahong Xu,Zhaodi Wang,Xin Yang
Structural damping composites exhibit considerable potential in aerospace and other fields due to their excellent damping and vibration reduction performance, as well as their structural carrying capacity. However, conventional structural damping composite materials generally do not combine excellent mechanical and damping properties at the same time, which makes it difficult for them to meet the practical demand in engineering. In this paper, polyetherimide (PEI) non-woven fabric interlayer materials loaded with quantified polydopamine (PDA) and carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were used to prepare carbon fiber-reinforced bismaleimide composites through the co-curing process. The mechanical and damping properties of the composites were systematically studied. The results demonstrate that PEI non-woven fabric interlayers loaded with PDA and MWCNTs-COOH can synchronously improve the mechanical and damping properties of the co-cured composites. The incorporation of carbon nanotubes and polydopamine during the co-curing process synergistically improves the flexural strength, flexural modulus, interlaminar shear strength, and impact fracture toughness of the composites. Most importantly, damping properties show an increase of 45.0% in the loss factor of the co-cured composites. Moreover, the reinforcement mechanism was investigated using the optical microscopy and scanning electron microscopy, which indicated that the PEI interlayers loaded with carbon nanotubes and polydopamine form a rich resin area between the layers of the composites.Keywords:structural damping composites;loss factor;PEI non-woven fabrics;carboxylated carbon nanotubes;polydopamine
研究领域:
材料科学
·
复合材料
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 63
·期 2
·574-583
·
IF 2.573
Tianming Gao,Biao Yu,Yonghai Hui,Jing Chen,Kyungho Chung,Sheng Wang,Yongyue Luo
Covalent bond cross-link networks endow rubber with unique resiliency enabling it to be widely used as a series of irreplaceable materials in modern life. However, the balance between rigidity and toughness, which is highly desired with the growing demand for high-performance rubber, remains a significant challenge for covalent bond networks. In this study, magnesium oxide (MgO) was filled in an ethylene acrylic elastomer (AEM) to construct both ionic cluster and coordinate bonds within the framework of a covalent cross-link network, which significantly improved the properties of AEM. The MgO-filled AEM was measured through Fourier transform infrared spectroscopy and thermogravimetric analysis, using a universal testing machine, dynamic mechanical thermal analyzer, and rubber process analyzer. As the multi-bond network was successfully constructed, the tensile strength was enhanced by almost 10 times, and unexpected dynamic properties were exhibited with a higher elastic modulus (rigidity) attributed to ionic clusters and a higher loss factor (toughness) attributed to the coordinate bonds. With the efficient enhancement of the mechanical properties, the improved toughness can dissipate energy to preserve the integrity of rubber under the application of an external mechanical force.
研究领域:
材料科学
·
高分子化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yunhong Liao,Xiang Wang,Huawei Zou,Pengbo Liu
C-Si bond was widely used to enhance the dielectric characteristics of polymers owing to its inherent low polarity. However, the potential of silicon-containing branched chains for modifying epoxy resins has been rarely explored. In this research, two active esters with silicon-containing branched chains of different chain lengths (DASIO, DASIOL), and another active ester with silicon-free branched chains (DAO) have been synthesized and utilized as curing agents of DCPD epoxy resins. After introducing silicon-containing branched chains, the loss factor (D f ) value of the cured epoxy system was significantly reduced. At 10 GHz, the D f values of DASIO/EP and DASIOL/EP systems were 6.47‰ and 6.82‰ respectively, reflecting decreases of 29.8% and 26% from the DAO/EP system value. With the extension of the chain length of silicon-containing branched chains, the cured epoxy system's dielectric constant (D k ) value exhibited a downward trend. When compared to the DASIO/EP system, the D k value of the DASIOL/EP system showed a reduction from 2.84 to 2.62. The silicon-containing branched chains could improve the flexibility of the cured epoxy system. The elongation at break of DASIOL/EP system was 4.2%, which have increased by 30%, in comparison to the DAO/EP system. In addition, through introduction of silicon-containing branched chains, the cured epoxy system also showed improved thermo-mechanical properties, hydrophobic properties and thermal stability. The research findings indicated that the silicon-containing branched chains were capable of enhancing the dielectric performances of the epoxy system. Additionally, by regulating the length of the silicon-containing branched chains, a balance of mechanical properties, thermal properties, etc. could be achieved. This provided a novel approach for developing low-D f epoxy materials in the electronics industry.
研究领域:
材料科学
·
高分子化学
·
电气工程
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 2
·963-972
·
IF 3.9
Jinpeng Luo,Hui Tong,Song Mo,Fei Zhou,Song Zuo,Chuanqiang Yin,Ju Xu,Xiaomin Li
With the growing development of film capacitors in various applications, the requirements for polymer dielectrics have increased accordingly. In this work, a series of ester-cotaining polyimide (EPI) dielectrics were designed and fabricated. Futhermore, integrated exploration of experimentation and molecular simulation is proposed to achieve polymer dielectrics with advanced comprehensive performance, as well as to analyze the dielectric mechanism in-depth. The EPIs show superior thermal resistance and dielectric properties. A Weibull breakdown strength of 440–540 MV m−1, permittivity of 3.52–3.85, dissipation factor of 0.627–0.880% and theoretical energy density of 3.13–4.90 J cm−3 were obtained for the EPIs. The relationship between microscopic parameters and dielectric behavior was investigated in detail. According to the experimental and calculated results, there is close correlation between dipolar moment density (μ/Vvdw) and dielectric permittivity (εr). It is deduced that the integrated research of experiments and molecular simulation would be an effective strategy to reveal the dielectric mechanism as well as assist in the molecular design of polymer dielectrics.
研究领域:
材料科学
·
高分子化学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）