Simultaneously improving the tensile strength and modulus of aramid fiber by enhancing amorphous phase in supercritical carbon dioxide

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20599-20604 ◽  
Author(s):  
Haijuan Kong ◽  
Cuiqing Teng ◽  
Xindong Liu ◽  
Jianjun Zhou ◽  
Hongpeng Zhong ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Tensile Strength ◽  
Supercritical Carbon Dioxide ◽  
Amorphous Phase ◽  
Aramid Fiber ◽  
Aramid Fibers ◽  
Supercritical Carbon

Improving the tensile strength and modulus of aramid fibers by enhancement of the amorphous phase in supercritical carbon dioxide.

scholarly journals Tensile properties of PolyLactic Acid Composite Foamed via Supercritical Carbon Dioxide

2021 ◽  
Vol 2129 (1) ◽  
pp. 012007
Author(s):  
N M Nordin ◽  
H Anuar ◽  
F Ali ◽  
Y F Buys
Keyword(s):  
Thin Films ◽  
Carbon Dioxide ◽  
Tensile Strength ◽  
Supercritical Carbon Dioxide ◽  
Essential Oil ◽  
Tensile Properties ◽  
Polylactic Acid ◽  
Treatment Period ◽  
Cinnamon Essential Oil ◽  
Supercritical Carbon

Abstract Tensile properties of foamed PolyLactic Acid (PLA) composite were studied. In this work, PLA were incorporate with Durian Skin Fibre (DSF) and Cinnamon Essential Oil (CEO) to form PLA bio composite and further treat via supercritical carbon dioxide (SCCO2) to form foamed PLA bio composite. The tensile strength value of foamed PLA bio composite slightly drops from foamed PLA. As for stress strain graph, the percentage of strain for foamed PLA and PLA bio composite did not distinct much. Through SEM, the foamed PLA bio composite showing that it did not fully foamed after treated via SCCO2 which due to treatment period and the thickness of the thin films.

scholarly journals Improving the Mechanical and Surface Properties of Aramid Fiber by Grafting with 1,4-Dichlorobutane under Supercritical Carbon Dioxide

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3766
Author(s):  
Chuyuan Jia ◽  
Chengce Yuan ◽  
Zhenyu Ma ◽  
Yunzhe Du ◽  
Li Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Surface Properties ◽  
Dynamic Contact Angle ◽  
Aromatic Polyamide ◽  
Dynamic Contact ◽  
Aramid Fiber ◽  
Fiber Properties ◽  
Pull Out ◽  
Supercritical Carbon

The mechanical and surface properties of aramid fiber were simultaneously improved by grafting with 1,4-dichlorobutane in supercritical carbon dioxide (scCO2). 1,4-dichlorobutane was penetrated and reacted with heterocyclic an aromatic polyamide backbone along with supercritical CO2 fluids. The surface roughness and surface energy of the modified aramid fiber—which were measured by scanning electron microscopy (SEM) and the dynamic contact angle (DCA) test, respectively—significantly increased. X-ray diffractometer (XRD) measurements indicated that the crystallinity of the aramid fiber obviously increased after treatment in scCO2 under stretching. A single fiber tensile test showed that the tensile strength of the aramid fiber greatly enhanced after the modification due to its improved crystallinity characteristics. Moreover, the monofilament pull-out tests indicated that the interfacial shear strength (IFSS) test of the aramid fiber/epoxy composite increased by 24.3% from 51.30 to 63.91 MPa after the modification. This research provides a novel method for the simultaneous surface modification and mechanical improvement of aramid fiber properties.

A new method of producing conductive aramid fibers using supercritical carbon dioxide

2006 ◽  
Vol 201 (3-4) ◽  
pp. 628-636 ◽  
Author(s):  
Xi Zhao ◽  
Kazumasa Hirogaki ◽  
Isao Tabata ◽  
Satoko Okubayashi ◽  
Teruo Hori
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
New Method ◽  
Aramid Fibers ◽  
Supercritical Carbon

An investigation for the performance of meta-aramid fiber blends treated in supercritical carbon dioxide fluid

2015 ◽  
Vol 16 (5) ◽  
pp. 1134-1141 ◽  
Author(s):  
Huanda Zheng ◽  
Juan Zhang ◽  
Bing Du ◽  
Qufu Wei ◽  
Laijiu Zheng
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Aramid Fiber ◽  
Supercritical Carbon

scholarly journals Study on Surface Properties of Aramid Fiber Modified in Supercritical Carbon Dioxide by Glycidyl-POSS

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 700 ◽  
Author(s):  
Yang Li ◽  
Zhu Luo ◽  
Le Yang ◽  
Xiaolong Li ◽  
Kun Xiang
Keyword(s):  
Carbon Dioxide ◽  
Tensile Strength ◽  
Shear Strength ◽  
Supercritical Carbon Dioxide ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Sem Images ◽  
Grafting Reaction ◽  
Pull Out ◽  
Supercritical Carbon

The outstanding diffusivity and permeability of supercritical carbon dioxide (scCO2) are extremely beneficial for grafting reaction. In this work, aramid fibers (AF) are modified in scCO2 by glycidyl-polyhedral oliomeric silsesquioxane (POSS) with 2-ethyl-4-methylimidazole (2E4MZ) on the basis of cleaning with acetone. The surface morphology and chemical structure of the modified AF were measured and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), Thermogravimetric (TG), and Atomic force microscope (AFM). The interfacial shear strength (IFSS) was measured by a micro-bond pull-out test, then the modified AF/EP composites were prepared and the interlaminar shear strength (ILSS) was characterized. Research has shown that some of the glycidyl-POSS molecular chains permeated into the surface of the fiber and grafted onto the surface of the AF after modification, and the other glycidyl-POSS self-assembled on the surface of the fiber. XPS indicated the introduction of C–O and –COO–, which confirmed the existence of chemical reactions between AF and glycidyl-POSS. AFM and SEM images revealed that 2E4MZ, not only promoted the grafting reaction of glycidyl-POSS, but also intensified the self-assembly of glycidyl-POSS, both of which increased the roughness of the fiber. A monofilament tensile test and micro-bond pull-out test showed that there was a negative effect on the tensile strength after scCO2 processing. The tensile strength of modified AF, with glycidyl-POSS, increased the highest strength of 25.7 cN dtex−1, which was 8% higher than that of pristine AF. The improvement of ILS roughness and the polar chemical groups produced in grafting reaction. These results indicated that AF, treated in scCO2, with glycidyl-POSS, which is a suitable way of fiber modification, can significantly improve the surface adhesion of AF reinforced composites.

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