INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Qinqin Luo,Yanchao Yuan,Chunlei Dong,Haohao Huang,Shumei Liu,Jianqing Zhao
The flame retardancy, thermal, and mechanical properties of the cured epoxy resins are difficult to be simultaneously improved. In the present work, a novel DPPA-based curing agent, 10-[(4-hydroxyphenyl)(4-hydroxyphenylimino)methyl]-5,10-dihydrophenophosphazine 10-oxide (H-DPPA), is successfully synthesized to serve as a co-curing agent of 4, 4′-diaminodiphenylmethane (DDM) for bisphenol A diglycidyl ether (DGEBA) epoxy resin. With the aid of 3.0 wt % of H-DPPA, the cured epoxy resin, in which the phosphorus content is as low as 0.22%, passes V-0 rating of UL-94 test with limiting oxygen index (LOI) of 31.8%. The high flame retardancy of epoxy resin modified by H-DPPA originated mainly from the formation of intumescent char layer during combustion. This new type of flame retardant containing both phosphine oxide structure and nitrogen moieties provides epoxy resins with excellent integrated performances.
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
Minerals
·
2024
·Vol. 14
·期 7
·692
·
IF 2.2
Zehui Gao,Chongjun Liu,Tong Lu,Zhiqiang Zhao,Guiye Wu,Yangge Zhu
The relationship between the structure of bis (2,4,4-trimethylpentyl) phosphinic acid (BTPA), diethyl phosphinic acid (DEPA), and diphenyl phosphinic acid (DPPA) on the flotation performance of malachite was investigated. Through a series of flotation experiments, density functional theory (DFT) calculations, and surface analysis methods, we aimed to deeply understand the microscopic mechanism of the interactions between these collectors and the malachite surface. The experimental results showed that BTPA exhibited excellent selectivity and flotation performance for malachite in the pH range of 5.0–11.0, significantly better than DEPA and DPPA. Surface analysis evidence from X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) further confirmed the chemical adsorption characteristics of BTPA on the malachite surface. DFT calculations revealed that the adsorption capacity of BTPA on the malachite surface exceeds that of DEPA and DPPA. Electron transfer analysis, especially through frontier molecular orbital theory, differential charge density, PDOS, and COHP analysis, indicated that the charge transfer process from the s orbitals of oxygen atoms in the collectors to the d orbitals of copper atoms on the mineral surface is the decisive factor for the adsorption strength.
研究领域:
矿物加工工程
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 84
·68476-68484
·
IF 3.84
Qinqin Luo,Yanchao Yuan,Chunlei Dong,Shumei Liu,Jiangqing Zhao
5,10-Dihydro-phenophosphazine-10-oxide (DPPA) served as a co-curing agent for 4,4′-diaminodiphenylmethane in the curing reaction of bisphenol A diglycidyl ether (DGEBA) epoxy resin (EP). 1H NMR tracking the reaction of DPPA with DGEBA revealed that the P–H bond in DPPA had a higher reactivity with the epoxy group than the N–H bond. DPPA could promote the curing reaction of DDM with DGEBA. DPPA endowed the epoxy resin with a high flame-retardant efficiency due to the unique combination of phosphorus and nitrogen in the phenophosphazine ring. The cured epoxy resin could achieve a V-0 rating in the UL-94 test with a limiting oxygen index (LOI) of 33.6% at only 2.5 wt% DPPA. The reduced peak heat release rate and total heat release, and increased char yield further verified the excellent flame retardancy of EP. The flame-retardant mechanism of the epoxy resin was investigated by thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), scanning electron microscopy, elemental analysis and FTIR spectrometry. The results indicated that DPPA catalyzed the formation of the rigid intumescent char and the generation of the blowing-out effect in the epoxy resin matrix.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2025
·
IF 5.4
Lang Xiao,Mingzhu Ye,Yirui Fan,Guangyu Liu,Huixia He,Jianxi Xiao
Digital light processing (DLP) bioprinting, known for its speed and precision, has become a key tool in disease modeling and regenerative medicine. Yet, creating bioinks with optimal printability, bioactivity, and cell-supporting capacity remains a major challenge. Here, we introduce a novel dual-network collagen-based bioink, methyl acrylated collagen-dimethylphenylphosphonate (CMA-DPPA), which enables the fabrication of mechanically robust and highly printable cell-laden constructs through DLP 3D bioprinting. The CMA-DPPA hydrogel is synthesized by cross-linking collagen with DPPA, followed by photo-crosslinking with CMA; this dual-cross-linking approach markedly improves printing fidelity, mechanical strength, and enzymatic degradation resistance of the 3D-printed constructs. The CMA-DPPA hydrogel exhibits excellent biocompatibility, effectively promoting cell adhesion, proliferation, and migration. In a rat model of full-thickness skin defects, CMA-DPPA hydrogel facilitated organized collagen fiber deposition and accelerated epidermal regeneration, thereby expediting wound closure. CMA-DPPA bioink enables precise, robust scaffold fabrication, showing great promise for DLP-based tissue engineering and regenerative medicine.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 8
·1989-1995
·
IF 2.162
Qinqin Luo,Yulin Sun,Biao Yu,Chengpeng Li,Jiangli Song,Dexin Tan,Jianqing Zhao
The flame-retarded epoxy resin with improved thermal properties based on environmentally friendly flame retardants is vital for industrial application. Hereby, a novel reactive-type halogen-free flame retardant, 10-(3-(4-hydroxy phenyl)-3,4-dihydro-2H-benzo[e] [1,3] oxazin-4-yl)-5H-phenophosphazinine 10-oxide (DHA-B) was synthesized via a two-step reaction route. Its structure was characterized using 1 H, 13 C, and 31 P NMR and HRMS spectra. For 4,4′-diaminodipheny ethane (DDM) and diglycidyl ether of bisphenol A (DGEBA)-cured systems, the epoxy resin with only 2 wt% loading of DHA-B passed V-0 rating of UL-94 test. Significantly, its glass transition temperature ( T g ) and initial decomposition temperature ( T 5% ) were as high as 169.6°C and 359.6°C, respectively, which were even higher than those of the corresponding original epoxy resin. Besides, DHA-B decreased the combustion intensity during combustion. The analysis of residues after combustion suggested that DHA-B played an important role in the condensed phase.
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 POWER SOURCES
·
2023
·
IF 9.2
Yuhan Lin,Zhichuan Shen,Junqiao Huang,Junli Zhu,Shiyong Jiang,Shiying Zhan,Yu Xie,Jiahong Chen,Zhicong Shi
Gel polymer electrolytes (GPEs) play a crucial role in promoting the development of lithium metal batteries , as they combine the high ionic conductivity of liquid electrolytes with the enhanced safety provided by solid electrolytes . However, traditional polymer electrolytes are typically poured using non-in-situ methods, which results in poor electrode-electrolyte contact and compromises their performance. In this paper, in situ thermal polymerization is utilized to incorporate di-pentaerythritol pentaacrylate (DPPA) and 3,3,4,4,5,5,6,6,7,7,8,8-tridecafluorooctyl acrylate (TFOA) into PAN spinning porous membranes. Application of TFOA reduces the crystallinity of GPEs and thus enhancing the Li + transport capability, which enables the newly constructed GPEs to exhibit an ionic conductivity of 2.52 × 10 −3 S cm −1 and a lithium-ion transport number of 0.61 at 30 °C. Simultaneously, fluoro-containing groups actively contribute to the formation of a negative solid electrolyte interphase (SEI) film full of LiF, ensuring the stable operation of Li symmetrical batteries for over 2000 h at a current density of 0.40 mA cm −2 . The capacity retention rate of lithium metal batteries (LMBs) with commercial NCM811 cathodes reaches 88.2% after 300 cycles. We firmly believe that our newly designed gel polymer electrolytes (GPEs) can offer a viable solution for high-voltage and high-rate LMBs.
研究领域:
材料科学
·
电化学
·
电池技术
·
聚合物化学
✓ 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）