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Xiong L.-K.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | Xiong L.-K.,Tianjin Polytechnic University | Yin C.-Y.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | Yin C.-Y.,Tianjin Polytechnic University
Textile Research Journal | Year: 2017

Unmodified nylon is dyeable to a single color only, and is almost exclusively dyed with acid dyes that are absorbed with amine groups of nylon molecules. Two types of polycaprolactam (PA6) copolyamide were successfully prepared with 5-sulfoisophthalic acid monosodium salt and poly(ethylene glycol) (PEG) units named cationic dyeable polyamide (CD-PA6) and easy cationic dyeable polyamide (ECD-PA6). The chemical and crystalline structures of CD-PA6 and ECD-PA6 were characterized by Fourier transform infrared spectroscopy and wide angle x-ray diffraction, and their thermal properties were tested by differential scanning calorimetry and thermogravimetric analysis, respectively. In addition, the rheological behavior and mechanical properties of copolyamide are presented in this paper. The influence of chemical modification in polyamide 6 fibers on the dyeing properties was investigated using cationic dye (methylene blue). The incorporation of PEG not only destroyed the regularity of the molecular chain arrangement and created more amorphous regions of ECD-PA6 samples, but also led to nylon 6 changing from the α-form to the γ-form. In addition, the crystallinities and degradation temperatures of samples which corresponded to different mass losses of CD-PA 6 and ECD-PA6 declined as the sulfonic group content increased, since large –SO3Na side groups in the copolymers prevented the chain molecules from tightly coagulating and obstructed the formation of larger crystals. Based on the analysis of the dyeing, a distinct improvement in tinctorial affinity and wash fastness for modified fibers compared with unmodified fibers was revealed. © 2016, © The Author(s) 2016.


Li G.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | Yu z.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | Han n.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | Zhang X.,Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber | And 2 more authors.
Polymer Composites | Year: 2015

Polyaniline (PANI)/viscose fiber (VF) adducts were prepared by the polymerization of aniline with ammonium persulfate as an oxidant and VF as a template in hydrochloride solution. PANI deposited on the surface of VF because of the interaction between PANI and VF. The effect of PANI content and the reaction time on the performance of PANI/VF adducts were evaluated, respectively. The electrical conductivity of PANI/VF adducts increased with reaction time from 2 to 8 h, but the conductivity decreased at the higher reaction time because of the aggregation of PANI particles. With the increasing of reaction time, the tensile strength initially decreased to 1.299 cN/dtex at 3 h, subsequently increased to 1.528 cN/dtex at 8 h, and finally diminished a little to 1.475 cN/dtex at 24 h. When the adducts were washed in water, the conductivity only decreased from 2.71 × 10-3 to 2.4 × 10-3 S/cm, and it was stable after washing 50 times. © 2015 Society of Plastics Engineers.

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