The Properties of Polyimide Fibers Modified by Functionalized Muti-Wall Carbon Nanotubes Based on Friedel-Crafts Acylation

Muti-wall carbon nanotubes (MWCNTs) were functionalized by grafting polyimide (PI) on their surface via Friedel-Crafts acylation. The functionalized MWCNTs (f-MWCNTs) showd less damages than unfunctionalized ones. The partially imidized polyamide acid as-spun fibers containing f-MWCNTs were prepared by wet spinning, and the final PI/f-MWCNTs composite fibers were obtained by heat treatment. The tensile strength of the PI based composite fiber containing 1.0 wt% f-MWCNTs was 818.3 MPa and the Young’s modulus was 9.26 GPa, which were about 81% and 88% higher than those of pure PI fiber, respectively. Besides, the thermal stability of PI/f-MWCNTs composite fibers was obviously improved.

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Effect of Compatibilizer on the Interface Bonding of Graphene Oxide/Polypropylene Composite Fibers

Polymers ◽

10.3390/polym10111283 ◽

2018 ◽

Vol 10 (11) ◽

pp. 1283 ◽

Cited By ~ 4

Author(s):

Miao Miao ◽

Chunyan Wei ◽

Ying Wang ◽

Yongfang Qian

Keyword(s):

Thermal Stability ◽

Graphene Oxide ◽

Loss Modulus ◽

Composite Fiber ◽

Mechanical Analysis ◽

Interfacial Bonding ◽

Composite Fibers ◽

Scanning Calorimetry ◽

Blending Method ◽

Thermal Stability Of

To improve the interfacial bonding and thermal stability of graphene oxide (GO)/polypropylene (PP) composite fibers, a composite fiber with PP as the matrix, GO as reinforcement and maleic anhydride-grafted PP (PP-g-MAH) as a compatibilizer was prepared by a simple and efficient melt-blending method. The GO content was 0.0–5.0 wt %. According to the Fourier Transform Infrared (FT-IR) spectroscopy results, the interfacial bonding in the PP/MAH/GO composite fibers was improved. The Dynamic Mechanical Analysis (DMA) results show that the addition of GO resulted in better interfacial adhesion and higher storage modulus (E′). The loss modulus (E′′) of the PP/MAH/GO-x composite fibers increased with increasing amount of added GO, whereas the loss factor (tan δ) decreased. GO and PP-g-MAH were analyzed by Thermogravimetric Analysis (TGA). The thermal stability of the composite fibers was improved compared to PP. Differential Scanning Calorimetry (DSC) analysis showed that the addition of PP-g-MAH to the composite fiber improved the interfacial bonding of GO in the PP matrix. Thus, compatibility between the two components was obtained. Based on the Scanning Electron Microscopy (SEM) results, the PP fibers exhibited relative orientation due to the strong crystalline morphology. The rough section, PP/GO blend fiber exhibits a very clear phase separation morphology due to the incompatibility between the two and the compatibility of GO and PP in PP/MAH/GO-3 composite fiber is improved, resulting in the interface between the two has improved.

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Thermoplastic Elastomer Nanocomposites of Polypropylene/Ethylene Octene Copolymer/Carbon Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.488-489.691 ◽

2012 ◽

Vol 488-489 ◽

pp. 691-695

Author(s):

Saowaroj Chuayjuljit ◽

Thitima Rupunt

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Thermal Stability ◽

Tensile Strength ◽

Young’S Modulus ◽

Young's Modulus ◽

Thermoplastic Elastomer ◽

Elongation At Break ◽

Ethylene Octene Copolymer ◽

Thermal Stability Of

The focus of this study is to investigate the influences of ethylene octene copolymer (EOC) and carbon nanotubes (CNTs) on the mechanical properties (tensile and flexural properties) and thermal stability of polypropylene (PP)-based thermoplastic elastomer nanocomposites. The PP/EOC blends were prepared at two different weight ratios, 80/20 and 70/30 (w/w) PP/EOC, and each blend was compounded with a very low loading of CNTs (0.5-2 parts by weight per hundred of the PP/EOC resin). Both PP/EOC blends exhibited a higher elongation at break but a lower tensile strength, Young’s modulus and flexural strength as compared with those of the neat PP. However, the addition of CNTs caused a slightly change in the tensile strength and flexural strength but a more significant change in the Young’s modulus and elongation at break. The Young’s modulus and elongation at break of the PP/EOC blends were improved by filling with the appropriate loading of the CNTs. Thus, the combined use of EOC and CNTs can provide the balanced mechanical properties to the PP. Moreover, thermogravimetric analysis showed an improvement in the thermal stability of PP by the presence of both EOC and CNTs.

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Electrically Conductive PEDOT-PSS/PAN Composite Fibers Prepared by Wet Spinning

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.627.885 ◽

2012 ◽

Vol 627 ◽

pp. 885-891 ◽

Cited By ~ 1

Author(s):

Yin Liu ◽

Xin Li ◽

Jing Chun Lü

Keyword(s):

Thermal Stability ◽

Sulfonic Acid ◽

Breaking Strength ◽

Wet Spinning ◽

Composite Fibers ◽

Electrically Conductive ◽

Spinning Process ◽

Polystyrene Sulfonic Acid ◽

Conductive Fibers ◽

Thermal Stability Of

The composite conductive fibers based on poly (3,4-ethylenedioxythiophene)-polystyrene sulfonic acid (PEDOT-PSS) blended with polyacrylonitrile (PAN) were prepared via a conventional wet spinning process. The influences of PEDOT-PSS content on the electrical conductivity, thermal stability and mechanical properties of the composite fibers were investigated. The fiber with 1.83 wt% PEDOT-PSS showed a conductivity of 5.0 S/cm. The breaking strength of the fibers was in the range of 0.36-0.60 cN/dtex. The thermal stability of the PEDOT-PSS/PAN composite fibers was similar to but a slightly lower than the pure PAN. The XRD results revealed that both pure PAN and the PEDOT-PSS/PAN composite fibers were amorphous phase, and the crystallization of the latter was lower than the former.

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Thermal stability of phase-separated nanograin structure during heat treatment

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.160055 ◽

2021 ◽

Vol 875 ◽

pp. 160055

Author(s):

Hua Guo ◽

Fawei Tang ◽

Yong Liu ◽

Zhi Zhao ◽

Hao Lu ◽

...

Keyword(s):

Heat Treatment ◽

Thermal Stability ◽

Thermal Stability Of

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The Preparation and Property Research on Laponite-Poly (L-Lactide) Composite Film

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1919 ◽

2013 ◽

Vol 750-752 ◽

pp. 1919-1923 ◽

Cited By ~ 1

Author(s):

Guo Xian Zhou ◽

Ming Wei Yuan ◽

Lin Jiang ◽

Ming Long Yuan ◽

Hong Li Li

Keyword(s):

Electron Microscopy ◽

Thermal Stability ◽

Tensile Strength ◽

Composite Film ◽

Composite Films ◽

Complexing Agent ◽

Solution Blending ◽

Method Of Solution ◽

Thermal Stability Of ◽

Scanning Electron

The laponite-poly (L-lactide) composite films are prepared by the method of solution blending with polylactide (PLA) and laponite. The result shows that the homogeneous and smooth composite film is prepared with 1, 4-dioxane. Thermogravimetry analysis (TG) and tensile strength studies demonstrate that the thermal stability and tensile strength are improved with the laponite added. The scanning electron microscopy (SEM) measurement indicates that the pores of composite films get uniform and network structure is more and more compact with compared to pure PLA film. The present study reveals that the laponite as a complexing agent can improve the mechanical properties and thermal stability of PLA.

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