JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
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2021
·Vol. 28
·期 2
·405-417
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IF 1.993
Zhiping Xu,Zhenhua An,Yan Ye,Rui Yang
Owing to the widespread use of polypropylene (PP) nanocomposites, their stability in the environment is becoming increasingly relevant. Accordingly, a systematic study of the relationship between the characteristics of inorganic nanofillers and the environmental aging behavior of PP is necessary to determine the service life of PP nanocomposites in outdoor environments. Therefore, in this study, we systematically investigated the effects of the chemical composition, particle size, crystalline form, and amount of inorganic filler (CaCO 3 , Al 2 O 3 , SiO 2 , and ZnO) on the outdoor aging behavior of PP. The results of outdoor aging experiments showed that the filler composition affects the aging behavior of PP. It was found that SiO 2 and ZnO nanoparticles accelerate and retard the outdoor aging of PP, respectively. In addition, PP composites containing inorganic fillers with relatively large particles or more stable crystalline forms exhibit relatively slow aging. In the case of the fillers other than ZnO nanoparticles, increasing the filler content accelerates the outdoor aging of PP. The evolution of cracks in the exposed surfaces of PP composites during outdoor aging was observed by scanning electron microscopy. The CO 2 generated by PP composites during in situ gaseous degradation product detection corresponds well with the results of the outdoor aging experiments. This study elucidates the effects of inorganic fillers on the outdoor aging behavior of PP.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zongqi Zhang,Fangling Ruan,Siquan Xu,Wenting Wu,Shengbin Shi,Guomin Xiao
Pervaporation is a separation technique relying on the concentration gradient , often expressed as partial vapor pressures , across polymeric or polymer-composite membranes. Those membranes inevitably exhibit a strong trade-off bottleneck between permeability and selectivity of target compounds, making the search for alternative materials with advanced performance characteristics highly desirable. This work aims to incorporate the advance of polymer and inorganic fillers to synthesize mixed matrix membranes . Effect of inorganic filler on properties and separation performance of Poly (vinyl alcohol) based mixed matrix membranes was investigated extensively in terms of several means of characterization methods. The results showed that the addition of inorganic fillers, NaA, SBA-15, SiO 2 and SiO 2 -NH 2 not only enhanced the separation factor but also increased the flux of water and DMF resulting in advance in total flux. This study may provide a guide to separate DMF-water solutions and will contribute to expand the high-value utilization of mixed matrix membranes in pervaporation.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ruonan Yin,Zhaohao Zhang,Chuan Shi,Jixiao Li,Zhaoyan Luo,Jiangtao Hu,Yongliang Li,Hongwei Mi,Chuanxin He,Qianling Zhang,Xiangzhong Ren
For exploiting high-energy lithium–metal batteries, it is of utmost importance to develop electrolytes that possess exceptional ionic conductivity and an extensive electrochemical stability range. In this study, 3D PAN nanofibers and polymer electrolytes incorporating various inorganic fillers with different Lewis acid–base properties were fabricated. PAN@Al-SSE exhibits exceptional ionic conductivity (0.48 mS·cm–2 at room temperature), a high Li+ transference number (0.41), and a wide electrochemical window (5.26 V). The device is able to operate stably in Li symmetric cells for more than 1000 h under a potential of 0.03 V under a current density of 0.2 mA·cm–2. Besides, the groundbreaking technology equips high-voltage Li-LiCoO2 solid-state batteries with exceptional cycling performance (91.3% and 82.1% retention after 100 cycles at 0.2 and 1 C, respectively) at room temperature. Mechanistic studies indicate that the Lewis acid–base properties of surface fillers are instrumental and crucial to form a stable solid–electrolyte interphase layer. γ-Al2O3, in particular, with more Lewis acid sites, ensures the dissociation of LiTFSI and induces the excessive decomposition and polymerization of succinonitrile. There exists an equilibrium effect between dissociation and polymerization in a succinonitrile-based solid electrolyte, which plays a critical role in improving the manifestation of succinonitrile-based solid-state lithium cells, especially under high-voltage conditions.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DENTAL MATERIALS
·
2021
·
IF 5.304
Hao Niu,Dan-Lei Yang,Tianyu Gao,Jie-Xin Wang
Objective The purpose of this study is to develop a mathematical model for efficient prediction of the packing density of different filler formulations in dental resin composites (DRCs), and to study properties of DRCs at the maximum filler loading (MFL), thereby providing an effective guidance for the design of filler formulations in DRCs to obtain excellent properties. Methods The packing density data generated by discrete element model (DEM) simulation were used to re-derive the parameters of 3-parameter model. The modifier effect was also induced to modify the 3-parameter model. DRCs with 10 filler formulations were selected to test properties at the MFL. The packing densities of binary and ternary mixes in DRCs were calculated by 3-parameter model to explore the regularity of composite packing. Results The predicted packing density was validated by simulation and experimental results, and the prediction error is within 1.40 vol%. The optimization of filler compositions to obtain a higher packing density is beneficial to enhancing the mechanical properties and reducing the polymerization shrinkage of DRCs. In binary mixes, the maximum packing density occurs when the volume fraction of small fillers is 0.35−0.45, and becomes higher with the reduction of particle size ratio. In ternary mixes, the packing density can reach the maximum value when the volume fractions of large and small fillers are in the 0.5−0.75 and 0.15−0.4 ranges, respectively. Significance The modified 3-parameter model can provide an effective method to design the multi-level filler formulations of DRCs, thereby improving the performance of the materials.
研究领域:
牙科学
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材料科学
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2020
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IF 7.635
Dan-Lei Yang,Qian Sun,Hao Niu,Rui-Li Wang,Dan Wang,Jie-Xin Wang
Resin composites have been frequently applied in dental restoration due to their distinguished overall performance. The size, structure and composition of inorganic fillers have significant effects on the properties of dental resin composites (DRCs). The aim of our research is to strengthen the structure of spray-dried silica colloidal nanoparticle clusters (SCNCs) by means of a calcination process, and achieve the excellent comprehensive performance of DRCs by the combined use with different fillers. The results indicate that the SCNCs calcined at 500 °C has a significant strengthening effect on the flexural properties and hardness of DRCs except the decrease of compressive strength in comparison to the uncalcined SCNCs. To overcome this problem, the SiO 2 nanoparticles (NPs) as building blocks for SCNCs and the SCNCs were further adopted as co-fillers of the calcined SCNCs (CSCNCs). It can be found that the strengthening effect of SCNCs is better than that of the NPs at the same filling ratio. The DRCs filled with 60 wt% CSCNCs and 10 wt% SCNCs have a greatly enhanced compressive strength , reaching the same level with the DRCs filled with 70 wt% SCNCs. More importantly, the corresponding flexural strength (143.5 ± 8.3 MPa), flexural modulus (8.91 ± 0.48 GPa) and hardness (70.7 ± 1.4 HV) still have an improvement of 14%, 23% and 48% in comparison with those of the counterpart, respectively.
研究领域:
材料科学
·
牙医学
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 10
·2603-2611
·
IF 2.119
Chen Shaojie,Zhao Yanran,Yang Jing,Yao Lili,Xu Xiaoxiong
Three types of inorganic electrolytes [Li 10 GeP 2 S 12 (LGPS), 75Li 2 S·24P 2 S 5 ·1P 2 O 5 (LPOS), Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP)] with different particle sizes and electrochemical properties are selected as active fillers incorporated into poly(ethylene oxide) (PEO) matrix to fabricate hybrid solid electrolytes. The optimum composition of each filler is found in consideration of ionic conductivity. Their electrochemical characteristics are investigated. The optimal conductivities are 1.60 × 10 −5 , 1.18 × 10 −5 , and 2.12 × 10 −5 S cm −1 at room temperature for PEO-1%LGPS, PEO-1%LPOS, and PEO-20%LAGP, respectively. The electrochemical stability windows of these hybrid solid electrolytes are all above 5 V (vs. Li + /Li). The results show that these fillers have positive effects on the ionic conductivity, lithium ion transference number, and electrochemical stability. The relationship between the type of filler and electrochemical properties has been investigated. All-solid-state cells LiFePO 4 /Li are fabricated and present fascinating electrochemical performance with high capacity retention and good cycling stability. This work provides promising electrolytes prepared by a simple method.
研究领域:
材料科学
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电化学
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能源存储
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固态离子学
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功能材料
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锂电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Rui Chang,Yuan Liang,Qingfei Hao,Jingyuan Xu,Na Li
In this work, we first utilized hexamethylene diisocyanate-modified Al 2 O 3 as inorganic fillers to construct a double-network solid polymer electrolytes based on the interpenetrated poly(vinylidene fluoride) and poly(ethylene oxide) (PEO@PVDF). The hexamethylene diisocyanate can promote the uniform dispersion of Al 2 O 3 in PEO@PVDF polymer electrolytes. Consequently, the PEO@PVDF polymer electrolyte with hexamethylene diisocyanate-modified Al 2 O 3 (PPH@Al 2 O 3 ) exhibited a perfect room temperature ionic conductivity (9.19 × 10 −5 S cm −1 ), excellent electrochemical stability voltage (4.7 V). The LiFePO 4 //PPH@Al 2 O 3 //Li cell delivers an initial capacity of 139.2 mAh g −1 at 0.2 C and with a capacity retention close to 100% after 100 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 44
·6417-6425
·
IF 5.582
Yi-Cong Wang,Pei-Yi Cheng,Zhi-Qian Zhang,Ke-Xin Fan,Rui-Qi Lu,Shu Zhang,Yi-Xian Wu
Highly efficient terpolymerizations of ethylene, propylene and 5-ethylidene-2-norbornene (ENB) using a half-titanocene containing iminoimidazolidine (T5) catalyst with a methylaluminoxane (MAO) cocatalyst could be achieved in the presence of small amounts of triisobutylaluminium (TIBA) and 2,6-ditertbutyl-4-methyl-phenol (BHT) at TIBA : BHT : Ti = 20 : 20 : 1 (molar ratio). The catalytic activity reached 2.20 × 107 g polymer per mol of Ti per h for the copolymerization of ethylene and propylene and the ethylene–propylene copolymer with a high incorporation ratio of propylene (39.1 mol%) was afforded by using the T5/TIBA/BHT/MAO catalytic system. Interestingly, the catalytic activity, the incorporation ratio of propylene into the copolymer chains and the percentage of randomly distributed sequences could be improved by an increase in the BHT/Ti molar ratio from 0 to 20. Very importantly, the ENB conversion could reach more than 95%, indicating that this T5/TIBA/BHT/MAO catalytic system exhibits excellent copolymerization ability for ENB with ethylene and propylene. The content of ENB units in the resulting ethylene–propylene–diene rubbers (EPDMs) could be increased up to 6.8 mol% (20.8 wt%) by increasing the ENB concentration in the monomer feed without sacrificing the catalytic activity and ENB conversion. The extremely high ENB conversion was significant for the highly efficient production of EPDMs with relatively low cost and short processes. The EPDM with a high content of ENB units is critical for rapid vulcanization during the processing and for the preparation of a functionalized EPDM. The CC double bonds in the ENB units in the above EPDM can be cleanly converted into carboxylic functional groups via light-mediated thiol–ene reaction, leading to the production of the functionalized EPDM with various contents of carboxylic side groups. The functionalized EPDMs exhibit enhanced hydrophilicity, which may result in good compatibility with inorganic fillers and strong interaction between inorganic fillers and organic terpolymers.
研究领域:
高分子化学
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材料科学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）