Facile Preparation of Hyperbranched Polysiloxane-Grafted Aramid Fibers with Simultaneously Improved UV Resistance, Surface Activity, and Thermal and Mechanical Properties

2014 ◽  
Vol 53 (7) ◽  
pp. 2684-2696 ◽  
Author(s):  
Hongrui Zhang ◽  
Guozheng Liang ◽  
Aijuan Gu ◽  
Li Yuan
Keyword(s):  
Mechanical Properties ◽  
Surface Activity ◽  
Uv Resistance ◽  
Thermal And Mechanical Properties ◽  
Aramid Fibers ◽  
Resistance Surface ◽  
Hyperbranched Polysiloxane ◽  
Facile Preparation

Unique surface modified aramid fibers with improved flame retardancy, tensile properties, surface activity and UV-resistance through in situ formation of hyperbranched polysiloxane–Ce0.8Ca0.2O1.8 hybrids

2015 ◽  
Vol 3 (23) ◽  
pp. 12515-12529 ◽  
Author(s):  
Xiaoling Zhu ◽  
Li Yuan ◽  
Guozheng Liang ◽  
Aijuan Gu
Keyword(s):  
Tensile Properties ◽  
Surface Activity ◽  
Flame Retardancy ◽  
Uv Resistance ◽  
Aramid Fibers ◽  
Hyperbranched Polysiloxane ◽  
In Situ Formation ◽  
Surface Modified ◽  
Unique Surface

Unique aramid fibers with hyperbranched polysiloxane–Ce0.8Ca0.2O1.8 hybridized coating were prepared, which have outstanding flame retardancy, tensile properties, surface activity and UV-resistance owing to the nature and synergistic effect of hybrids.

Preparation of novel low-κ polyimide fibers with simultaneously excellent mechanical properties, UV-resistance and surface activity using chemically bonded hyperbranched polysiloxane

2018 ◽  
Vol 6 (5) ◽  
pp. 1229-1238 ◽  
Author(s):  
Cairan Yang ◽  
Jie Dong ◽  
Yuting Fang ◽  
Lixiang Ma ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Activity ◽  
High Strength ◽  
Dielectric Constants ◽  
Uv Resistance ◽  
High Modulus ◽  
Low Dielectric ◽  
Polyimide Fibers ◽  
Hyperbranched Polysiloxane ◽  
Transparent Composites

High-strength and high-modulus fibers with low dielectric constants (low-κ) play an important role in newly-developed wave-transparent composites.

scholarly journals Heteroaromatic Polyamides with Improved Thermal and Mechanical Properties

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1793
Author(s):  
Miriam Trigo-López ◽  
Ana M. Sanjuán ◽  
Aranzazu Mendía ◽  
Asunción Muñoz ◽  
Félix C. García ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Thermal Performance ◽  
High Performance ◽  
Main Chain ◽  
Thermal And Mechanical Properties ◽  
Aramid Fibers ◽  
Aromatic Diamines ◽  
Aromatic Polyamides ◽  
Isophthaloyl Chloride

We prepared high-performance aromatic copolyamides, containing bithiazole and thiazolo-thiazole groups in their main chain, from aromatic diamines and isophthaloyl chloride, to further improve the prominent thermal behavior and exceptional mechanical properties of commercial aramid fibers. The introduction of these groups leads to aramids with improved strength and moduli compared to commercial meta-oriented aromatic polyamides, together with an increase of their thermal performance. Moreover, their solubility, water uptake, and optical properties were evaluated in this work.

scholarly journals Improving UV Resistance of Aramid Fibers by Simultaneously Synthesizing TiO2 on Their Surfaces and in the Interfaces Between Fibrils/Microfibrils Using Supercritical Carbon Dioxide

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 147 ◽  
Author(s):  
Hui Sun ◽  
Haijuan Kong ◽  
Haiquan Ding ◽  
Qian Xu ◽  
Juan Zeng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Surface Composition ◽  
Fiber Surface ◽  
Synthesis Process ◽  
Uv Resistance ◽  
Aramid Fibers ◽  
X Ray ◽  
Supercritical Carbon

Aramid fibers with low density and high strength, modulus, and thermal resistance are widely used in applications such as bulletproof vests and cables. However, owing to their chemical structure, they are sensitive to ultraviolet light, which degrades the fibers’ useful mechanical properties. In this study, titanium dioxide (TiO2) nanoparticles were synthesized both on the aramid III fiber surface and in the interfacial space between the fibrils/microfibrils in supercritical carbon dioxide (scCO2) to improve the UV resistance of aramid fibers. The effects of scCO2 treatment pressure on the TiO2 structure, morphology, surface composition, thermal stability, photostability, and mechanical properties were investigated using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, ultraviolet–visible spectroscopy, and single-fiber test. The results show that amorphous TiO2 formed on the fiber surface and the interface between fibrils/microfibrils, and decreased the photodegradation rate of the aramid III fiber. Moreover, this modification can also improve the tensile strength via treatment at low temperature and without the use of a solvent. The simple synthesis process in scCO2, which is scalable, is used for mild modifications with a green solvent, providing a promising technique for synthesizing metal dioxide on polymers.

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