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About the Journal
Journal Name: Journal of Donghua University (English Edition)
Started: 1984
Authorized: Ministry of Education, China
Directed: Donghua University
Publication Frequency: Bimonth
Tel: 021-62373948, 021-62373932
E-mail: jdhuenged@dhu.edu.cn
CN:31-1920/TS
ISSN:1672-5220
Preparation and Properties of Self-Crimping Polyamide-Based Side-by-Side Bicomponent Elastic Fibers
WU Yuhao;LANG Jiarui;ZHANG Shengming;LIU Jin;WANG Chaosheng;WANG Huaping;JI Peng;Side-by-side bicomponent fibers have a spring-like three-dimensional spiral crimp structure and are widely used in elastic fabric. The difference in thermal shrinkage between different polymers can produce an unbalanced stress during the cooling process, and this unbalanced stress can be exploited to prepare naturally crimped fibers by spinning design. In this work, different types of polyamides(PAs) were selected for fabrication of the PA-based side-by-side bicomponent elastic fibers using melt spinning, and the structure development and performance of such bicomponent elastic fibers were studied. Meanwhile, thermoplastic PA elastomer(TPAE) with intrinsic elasticity was also used as one of the comparative materials. The block structure of the PA segment and the polyether segment in the TPAE molecule is the key to providing thermal shrinkage differences and forming a good interface structure. As a result, the crimp ratio of PA6/TPAE bicomponent elastic fiber is 7.23%, which is better than that of the currently commercialized T400 fiber(6.72%). The excellent crimp performance of PA6/TPAE bicomponent elastic fibers comes from the asymmetric distribution of the stress along the radial direction of the fibers during the cooling process, which is caused by the difference in thermal shrinkage between PA6 and TPAE. In addition, the crimp formability of the PA-based bicomponent elastic fibers could be improved by expanding the shrinkage stress through wet-heat treatment. The crimp ratio of PA6/TPAE bicomponent elastic fibers reaches the maximum(33.08%) after treatment at 100 ℃. At the same time, the fabric made of PA6/TPAE bicomponent elastic fibers has the excellent air and water vapor permeability, with an air permeability of 272.76 mm/s and a water vapor transmission rate of 406.71 g/(m~2·h).
Cellulose-Based Nanofibers Electrospun from Cuprammonium Solutions: Preparation, Mechanical and Antibacterial Properties
DANISH Iqbal;ZHAO Renhai;MUHAMMAD Ilyas Sarwar;NING Xin;Nanofibers based on cellulose are highly desired due to their remarkable biocompatibility and attractive physical and biochemical characteristics. The current research describes a simple electrospinning process and the nano-materials therefrom, utilizing the classical cellulose-cuprammonium solution without the more exotic chemical solvent combinations. Furthermore, without the use of organic solvents, a binary polymer system with the addition of polyethylene oxide(PEO) is introduced to improve the robustness of the electrospinning and the properties of the final material. The impacts of the cellulose source, cellulose mass fraction and PEO formulation on spinnability, fiber morphology and mechanical properties are investigated. Nanofibers with diameters ranging from 130 nm to 382 nm are successfully fabricated. The presence of copper in the fabricated material is confirmed by using the X-ray photoelectron spectroscopy(XPS) analysis. The cuprammonium process significantly changes the original crystalline structure of cellulose Ⅰ into cellulose Ⅲ within the nanofiber morphology. The nanofibrous membranes also demonstrate notable antibacterial characteristics for Staphylococcus aureus(S. aureus) and Escherichia coli(E. coli).
Impact Behavior Analysis and Failure Mode Comparison of Glass Fiber(GF)/Polydicyclopentadiene(PDCPD) Thermosetting Composite for Automobile Bottom Protection Plate
MEI Zhonghao;PEI Zhilei;CHENG Lele;MIN Wei;GAO Ruize;CHENG Chao;ZHOU Fei;YU Muhuo;SUN Zeyu;A glass fiber(GF)/polydicyclopentadiene(PDCPD) composite impact simulation model was established based on LS-DYNA(the finite element analysis software peroduced by Livermore Software Technology Corporation) simulation. An optimal ply thickness of the composite GF/PDCPD was determined as 3.0 mm, and thus the final intrusion depth was controlled within 8.8 mm, meeting the performance standards for battery electric vehicle protection materials. A comparative analysis of failure modes during impacts was conducted for composites GF/PDCPD, GF/polypropylene(PP) and GF/polyamide(PA). The results indicated that GF/PDCPD exhibited compressive failure modes and ductile fractures, resulting in smaller damage areas. In contrast, GF/PP and GF/PA showed fiber fracture failures, leading to larger damage areas. The molding process and impact resistance of GF/PDCPD were investigated. By comparing the impact performance of GF/PDCPD with that of GF/PP and GF/PA, it was concluded that GF/PDCPD demonstrated superior performance and better alignment with the performance standards of battery electric vehicle protective materials. The predictability and accuracy of LS-DYNA simulation was verified, providing a theoretical foundation for further in-depth research.
Ti_3C_2 MXene and Ni~(2+) Enhanced Peroxymonosulfate Activation for Dyeing Wastewater Degradation
ZHANG Xinqi;HAN Bo;XU Jia;SHU Dawu;Dyeing wastewater has the problems of complex composition, deep color and difficulty in degradation, which seriously threaten the ecological environment. This study investigated the Ni~(2+)/peroxymonosulfate(PMS)/MXene system for efficient degradation of the dyeing wastewater with lower metal consumption. The reactive red 24(RR24) simulated dyeing wastewater was used as the research object. The influences of mass concentrations of PMS, Ni~(2+), MXene and RR24, and initial pH values on RR24 degradation were explored. The contribution of free radicals in the degradation of dyes was investigated by free radical quench experiments. The results showed that the degradation percentage of RR24 was as high as 96.62% using a mixture of 7.5 g/L PMS, 100 mg/L Ni~(2+) and 210 mg/L MXene at 25℃ for 60 min. Under neutral conditions, compared with the system without Ti_3C_2 MXene, the degradation percentage of RR24 increased by 2.04 times. In this system, the ·OH radical played a dominant role. When the dyeing wastewater was treated by using the Ni~(2+)/PMS/MXene system, the inorganic salts significantly altered the degradation rate of the dyeing wastewater, but only slightly affected the final degradation percentage.
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