FUEL
·
2021
·
IF 6.609
Chengyang Cao,Yang Ren,Hao Wang,Hongyun Hu,Baojun Yi,Xian Li,Linling Wang,Hong Yao
Solar-powered pyrolysis of waste tires has been extensively studied because it can rapidly convert waste tires into valuable gas products using sustainable energy. However, the emitted sulfurous pollutants during this fast pyrolysis process would significantly reduce the economic feasibility of disposal waste tires. In order to investigate and regulate the sulfur transformation behavior, a large-load thermogravimetric analyzer and an optical rapid thermal processor were adopted to characterize and simulate the solar-powered fast pyrolysis behavior. The sulfur fixation effect of CaO was also evaluated in this study. Results showed that CaO addition could increase the emission of H 2 and CO by promoting the cracking of organic compounds in tar. In comparison, it could decrease the CO 2 emission by adsorption or transformation. Also, an excellent sulfur fixation rate in char was achieved with 10 wt% CaO addition, but accompanied by increasing emission tendency of SO 2 , especially at 650 °C-6000 °C/min. It was attributed to the competition reaction between H 2 S and SO 2 in the gas phase and interaction between CaS and CaSO 4 in the condensed phase. Our findings could be beneficial to develop an in-situ sulfur removal method during the pyrolysis of waste tires in the industry.
研究领域:
能源与环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Dexiang Li,Zhaoyong Gao,Bin Zhang,Wei Ma,Bingtao Tang,Shufen Zhang
A significant amount of wastewater is generated in printing and dyeing processes of nylon textiles . The wastewater pollutes the environment and increases the post-treatment costs. To simultaneously obtain the excellent dye utilization and color fastness, low-water-soluble reactive dyes (LWSRDs) with vinylsulfone group as a reactive group were developed in this paper. The LWSRDs have dual characteristics of high exhaustion and forming covalent bonds with nylon fibers in neutral conditions. These characteristics result in higher fixation on nylon 6 traditional fibers (NTF) using Traditional dyeing process (TDP) compared with commercial reactive dyes. Based on the characteristics of LWSRDs, modified dyeing process (MDP), which was conducted in one-pot, significantly reduces the costs of chemicals and wastewater. Moreover, the fixation of LWSRDs on nylon fibers using MDP was higher than that using TDP. Notably, the dyed nylon fibers were uniform and vibrant, and demonstrated exceptional color fastness against washing and rubbing, exceeding grade 4. The results of innovative LWSRDs and their corresponding MDP offer an effective approach to dyeing nylon fibers, with good application prospects in dyeing industry.
研究领域:
纺织科学
·
环境科学
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2023
·
IF 2.3
Dexiang Li,Wei Ma,Bingtao Tang,Shufen Zhang
Reactive dyes in nylon dyeing have been associated with utilization inefficiencies despite their high color fastness. A potential solution to this issue involves combining the benefits of reactive dyes and milling acid dyes to obtain low-water-soluble reactive dyes (LWSRDs), which can stain and fix to nylon fibers under neutral conditions. To identify a suitable functional group for LWSRDs, six model dyes comprising one vinyl sulfone and five monochloro-s-triazines were prepared and reacted with glycine or hydrolyzed to simulate the fixation progress on nylon fibers. The results show that vinyl sulfone exhibited sufficient reactivity with glycine, and ∼3% hydrolysis over 90 min. Consequently, vinyl sulfone was considered a superior functional group for LWSRDs. Based on these results, four LWSRDs with monofunctional groups were synthesized and used for dyeing nylon 6 microfibers. Notably, these dyes exhibited fixation of >91% and demonstrated exceptional color fastness against washing and rubbing, exceeding grade 4. These results underscore the potential of LWSRDs as highly efficient and effective dyes for nylon, offering a solution to the limitations associated with conventional dyeing techniques.
研究领域:
化学工程
·
纺织科学
·
染料技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yu Qiao,Wenzhong Ma,You Zhang,Tiansheng Gao,Haicun Yang,Zheng Cao,Jing Zhong
Chemical cross-linking is commonly used to prevent slippage between molecular chains in shape memory polymers (SMPs) to improve shape return. However, chemical cross-linking makes SMPs less stretchable, and the disordered network structure reduces the ability of SMPs to maintain temporary shapes. To obtain ultra-high stretchability and better shape memory properties, a cyclic polymer (C-PTHF-OH) was introduced into the shape memory polyurethane (PUC X ) network, and the PUC X network topology was controlled by adjusting the content of C-PTHF-OH molecular rings. PUC 0.5 exhibited the highest shape fixation (99.9 %) and shape recovery (98.4 %), and the higher the content of the C-PTHF-OH molecular ring, the higher the elongation at break of the prepared PUC X , with a slight decrease in tensile strength. Compared to PUC 0 (2000 % elongation at break and 32 MPa tensile strength) prepared from the linear polymer, PUC 0.5 showed up to 2150 % elongation at break and 31 MPa tensile strength. This study provides new ideas for the design of network structures for SMPs and is a new paradigm introduced into the SMPs network by cyclic topological polymers.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 10
·2100254
·
IF 4.367
Ziting Zhou,Yue Meng,Cong Wei,Ying Bai,Xiaoying Wang,Daping Quan,Jing Zhou
Shape memory polymers (SMPs)are widely used owing to their ability to change shapes under external stimuli. Conventional covalently crosslinked SMPs have limitations in biomedical applications. This article presents a linear shape memory biodegradable polyester without chemical crosslinks or multiblock structures. A new programming protocol is developed to split the crystals into two parts with different melting transitions through partial melting/recrystallization. The split crystals play different roles in fixation and recovery process to complete a shape memory cycle. The ratio between the partitioned crystals affects the fixed rate and recovery rate. The shape memory performance can be optimized by controlling the partial melting temperature and pre-stretching of the sample. Examples of complicated shape changes demonstrate the effectiveness of the proposed technique. The method is applicable to crystallizable linear polymers and has potential applications in implantation devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COLORATION TECHNOLOGY
·
2023
·
IF 1.8
Zhengyang Gao,Wei Ma,Bingtao Tang,Shufen Zhang
The practical application of a sulphur black dye relies on its ability to dye cotton fibres with pure black colour and maintain the colour with high light fastness. Here, we report a synthesis method to prepare a novel water-soluble reactive sulphur black dye. The approach involves the reduction of CI Sulphur Black 1 to its leuco form and subsequent reaction with a water-soluble intermediate containing reactive groups synthesised from amino acid and cyanuric chloride. The optimal carboxyl and reactive group content of the water-soluble reactive sulphur black dye is 141 mmol/100 g, and the water solubility can reach 92 g/L. The fixation of the reactive sulphur black dye on cotton reaches 89% in a pad dyeing process without using sodium sulphate. The reactive sulphur black dye can achieve a light fastness of grade 6-7, a dry rub fastness of grade 4 and a wet rub fastness of grade 2, comparable or higher than the conventional CI Sulphur Black 1. The dyeing results showed that the novel water-soluble reactive sulphur black dye has excellent performance and good application prospects.
研究领域:
染料化学
·
纺织化学
·
应用化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Sijia Ren,Jiachun Feng
Poly(styrene-b-[ethylene-co-butylene]-b-styrene) (SEBS)/paraffin system is a promising class of shape memory polymers and the transition temperature of such materials could be flexibly regulated by choosing different paraffins. However, the difference in shape memory performance of SEBS/paraffin blends containing paraffin with same content but different melting temperature ( T m ) has not been comparatively studied. In this work, two series of SEBS/paraffin blends containing same content paraffin (30 and 70 wt%, respectively) with T m of 28.5 and 61.3 °C (denoted as P L and P H , respectively) were prepared and their shape fixing ratios (R f s) under conventional shape memory (CSM) and reversible plasticity shape memory (RPSM) programming methods were investigated. It was found that these blends with the same paraffin content showed different R f s regardless of the programming method. For example, the 30 wt% P H -containing sample exhibited higher R f under CSM programming, while the 70 wt% P L -containing sample showed higher R f under RPSM programming. By investigating microstructural changes, a possible explanation for the shape memory performance of SEBS/paraffin blends containing paraffin with different T m was proposed. This work was helpful to deepen the understanding of shape memory mechanism and broaden the application of SEBS/paraffin-based shape memory polymers.
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
·
2025
·
IF 2.8
Shuai Yang,Xiaoyun Yang,Zijian Song,Yingchun Li
Herein, we report light/electric synergistic-triggered shape memory poly(aryl ether ketone) (PAEK) composite actuators with enhanced shape memory behaviors that are able to fulfill the shape deformation process for various application opportunities. Composite actuators exhibit great shape memory behaviors with a high shape recovery ratio (95.1%–99.2%) and fixity ratio (over 96%). Besides, we construct light/electric synergistic-triggered shape memory behaviors, which are achieved through the prior softening of molecular chains by irradiating firstly, and then triggered by applied voltage. The shape recovery ratio of these light/electric synergistic-triggered shape memory effect (SME) reaches up to 89.6%, which is higher than the electric-triggered SME of 75.1%, indicating enhanced shape memory behaviors. As a comparison, we construct light/electric synchronous-triggered shape memory behaviors, and the recovery ratio is 85.8%. Due to the enhanced shape memory behaviors, these light/electric synergistic-triggered shape memory composite actuators fulfill the shape deformation process for various application opportunities.
研究领域:
材料科学
·
聚合物复合材料
·
智能材料
·
执行器
·
形状记忆合金/聚合物
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 4
·1222-1232
·
IF 3.665
Bei Liu,Kai Jin,Jie Tao,Hao Wang,Dan He,Huaguan Li
In this study, we proposed a machine learning (ML) method to optimize the comprehensive performance of shape memory epoxy polymers (SMEPs) based on experimental data as samples. Firstly, a series of SMEPs specimens were prepared, and their properties were evaluated respectively by testing four indexes including the glass transition temperature ( T g ), bending strength, strain fixation rate ( R f ), and strain recovery rate ( R r ). Subsequently, ML used these experimental data as samples for feature learning to investigate the influence of each component on these properties. The results indicated that methyltetrahydrophthalic anhydride was more favorable to T g and bending strength than methylhexahydrophthalic anhydride (MHHPA) as a curing agent. However, a certain amount of MHHPA must be included in the system to guarantee a higher R f and R r . Moreover, the right amount of bisphenol A cyanate ester in the system improved the comprehensive properties of SMEPs, especially the shape memory effect. Finally, a SMEPs system with superior properties was acquired through the optimization of four indexes of T g , bending strength, R f and R r . Therefore, this study shows that ML methods can also be used to investigate SMEPs that require more specific excellent performance.
研究领域:
材料科学
·
人工智能
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Yajun Ren,ZhuanZhuan Zhang,Wenlong Xia,Qifeng Zhou,Xiaofeng Song
Poly(L-lactide) (PLLA) was one of the most well-known biodegradable polyesters. Although its thermo-responsive shape memory (SM) function has been studied by proper program, high transformation temperature is not suitable in some biomedical applications. Water-responsive SM polymer is an alternative choice and exhibits great potential because it is harmless to the cells and tissues of organisms. In the work, a novel PCL-(PMVS- s -PAA)-PCL-PTMG-PCL-(PMVS- s -PAA)-PCL copolymer was devised as an additive to endow PLLA with water-responsive SM capability. The incorporated PLLA was characterized by cross-section, water contact angle, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Inserted PTMG segment and assisted ambient temperature were contributed to its SM behaviors. The shape fixation ratio and shape recovery ratio were 92.0% and 94.2%, respectively. The schematic diagram between internal microstructures and macroscopic properties was proposed. At the same time, the incorporated PLLA showed excellent toughness. So the obtained SM material would be promising for medical and biomimetic fields.
研究领域:
材料科学
·
生物医学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Wen Yang,Wenqing Du,Yang Liu,Haipeng Ren,Wei Zhao,Weilin Xu
The knitted-fabric reinforced shape memory polymeric composites (SMPC) have large recoverable deformation and limited mechanical properties, whereas woven-fabric reinforced SMPC possess good mechanical properties and limited recoverable deformation. In this work, six laminated SMPCs with different lay-up sequences were prepared using weft plain knitted fabrics (K), rib knitted fabrics (R), woven fabrics (W) and the epoxy-based shape memory polymer (SMP) to study the synergistic effect of the knitted/woven hybrid structure on the shape memory performance and mechanical durability of SMPC. The results show that SMPCs have a high shape fixation ratio and a good shape recovery ratio. When the knitted fabrics are laminated in the outer layers and the woven fabrics are in the middle layers, the shape recovery properties of SMPCs are good, and the SMPCs after shape memory cycles have a low damage area of interface debonding. The KKKK SMPCs obtain the smallest recovery force, and the WWWW SMPCs have the largest recovery force of up to 4.4 N. Furthermore, after 1, 5, and 10 shape memory cycles, the flexural strength and modulus of SMPCs generally decrease, whereas the fracture strain of SMPCs increases. The addition of knittedstructure to wovenructure can improve the residual strength ratio of SMPCs after shape memory cycles. The hybridized lay-up of knittedstructure and wovenructure endows the SMPCs with optimized shape memory performance, mechanical properties, and mechanical durability after shape memory cycles. Finally, the finite element simulation of SMPCs during U-bending was performed to help discuss the mechanism.
研究领域:
材料科学
·
聚合物复合材料
·
机械工程
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tianzhi Jin,Yajing Wang,Shun Yao,Chuxiao Hu,Ting Ma,Wenjie Xia
Carbon dioxide as a feedstock for synthesizing chemicals and fuels attracts numerous efforts via biological or chemical approaches. A newly Citrobacter BD11 was detected with distribution of 71.31 % in reservoir samples by metagenomic sequencing, and can convert CO 2 to succinic acid with hydrogen production under anaerobic condition. The pathway of hydrogen production and the succinic acid synthesis was explored by whole-genome sequencing and real-time quantitative polymerase chain reaction. The results showed the positive influences of pH, hydrogen pressure and magnesium ions on succinic acid production. The stage transition of hydrogen production and utilization was detected, and the nonlinear relationship between succinic acid production and exogenous carbon dioxide was proved. Under optimized conditions, the carbon fixation rate of 1.77 g/L*d and the succinate production rate of 7.51 g/L*d were finally achieved at pH = 7.0 with 50 KPa of hydrogen pressure and 4.0 g/L of MgCl 2 . This study demonstrated that this Citrobacter could be a promising platform for hydrogen production and convert CO 2 to diverse acids.
研究领域:
生物技术
·
环境科学
·
微生物学
·
生物化学
✓ 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）