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RISS 인기검색어
- 검색키워드
- 저자 : Zhenzhen Quan (검색결과 3 건)
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Quan, Zhenzhen,Suhr, Jonghwan,Yu, Jianyong,Qin, Xiaohong,Cotton, Chase,Mirotznik, Mark,Chou, Tsu-Wei Elsevier 2018 Composite structures Vol.184 No.-
<P><B>Abstract</B></P> <P>Among the processing parameters of additive manufacturing, printing direction is of critical importance. While studies on effects of printing direction have so far mainly focused on mechanical properties of solid specimens, the present research is intended to demonstrate printing direction dependence of mechanical behavior of additively manufactured 3D preforms and their composites. Compressive behavior of additively manufactured 3D braid preforms and composites was investigated for three distinct printing directions (0°, 45° and Z-direction). Fused filament fabrication (FFF) of acrylonitrile-butadiene-styrene (ABS) filament and short carbon fiber/ABS (CF/ABS) filament was adopted. First, solid cube specimens were fabricated; the parts printed along 0° and 45° directions showed more fabrication-induced pores. Then, 3D braid preforms were fabricated and infused with silicone matrix. For preforms printed along 45° direction, inter-yarn adhesion was observed, which enhanced specimen initial modulus. On the other hand, Z-direction specimens showed higher structural ductility, due to inter-yarn slippage.</P>
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Jiatai Gu,Zhenzhen Quan,Liming Wang,Hongnan Zhang,Ni Wang,Xiaohong Qin,Rongwu Wang,Jianyong Yu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Membranes with the functions of waterproofness and breathability are of great interest due to their huge scientificand commercial value in many practical applications. However, designing such membranes with a desirable performance bysimple and efficient fabrication process remains a tremendous challenge. Herein, novel binary structured composite fibrousmembranes were developed for waterproof and breathable applications via simple one-step multi-jet electrospinningtechnology. This composite membranes were made up of polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN). PVDF was incorporated into the PAN fiber matrix as a modifier to improve the hydrophobic behavior of fibers. Meanwhile,PVDF microspheres/fibers were employed as building blocks to orderly embed in PAN/PVDF fiber framework, impartingthe composite membranes with fluffy micro-nano hierarchical structures. Consequently, with the integrated features of robusthydrophobicity as well as elaborate fiber-microsphere binary structure, the resultant composite membranes exhibitedsynergistically modest waterproof and breathable performances with the hydrostatic pressure of 18.04 kPa, water vaportransmittance (WVT) rate of 4.65 kg m-2 d-1, and air permeability of 64.19 mm s-1. This simple preparation process andunique composite structure may provide a new insight to design and fabricate waterproof and breathable membranes forvariously potential applications, including the protective clothing, separation membrane, and filter.
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Wei Li,Zhenzhen Xu,Zongqian Wang,Changlong Li,Quan Feng,Yanan Zhu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
To investigate the effects of tertiary amination/hydroxypropylsulfonation on the adhesion-to-fibers and film properties of corn starch for warp sizing, a series of tertiary aminated and hydroxypropylsulfonated corn starch (TAHPSS) samples were prepared by the tertiary amination and hydroxypropylsulfonation of acid-hydrolyzed corn starch (AHS) with 2- dimethylaminoethyl chloride hydrochloride (DMC-HCl) and 3-chloro-2-hydroxy-1-propanesulfonic acid sodium salt (CHPS-Na) simultaneously. The adhesion was evaluated by measuring the bonding force of starch to the fibers. The film properties were investigated in terms of tensile strength, breaking elongation, degree of crystallinity, and moisture regain. The results showed that tertiary amination/hydroxypropylsulfonation was able to increase bonding forces of starch to cotton and polyester fibers, enhance breaking elongation and moisture regain of the starch film and to decrease the tensile strength and degree of crystallinity of the film, thereby improving the adhesion and reducing film brittleness. Increasing the level of tertiary amination/hydroxypropylsulfonation was favorable for gradually improving the adhesion and decreasing the brittleness. The TAHPSS showed potential for use in cotton warp sizing.
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