Structure and Physical Properties of Hydrophilic Polyamide Copolymers Fiber Based on Nylon 6 and Nylon 4,6
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Structure and Physical Properties of Hydrophilic Polyamide Copolymers Fiber Based on Nylon 6 and Nylon 4,6 Min Seok Kim1,2, Yeong Nam Hwang3, Soon Taek Kwon4, Seung Geol Lee1*, and Hyun Hok Cho1* 1
Department of Organic Material Science and Engineering, Pusan National University, Busan 46241, Korea 2 DYETEC, Daegu 41706, Korea 3 Kolon Industries, Inc., Gumi 39366, Korea 4 Korea Textile Development Institute, Daegu 41842, Korea (Received August 13, 2019; Revised January 6, 2020; Accepted February 5, 2020)
Abstract: Recently, hydrophilic synthetic fiber products have been sought to substitute natural fibers. This paper investigates the structure and properties of spined copolymer of nylon 6, nylon 4,6 and polyethylene oxide (PEO) – polypropylene oxide (PPO) diamine according to contents of PEO-PPO diamine (15-40 %). The structure of new polyamide (NPA) were analyzed by X-ray diffraction (XRD), differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), gradient density column and gas pycnometry. Through XRD and DSC analysis, it was confirmed that the structure of NPA was similar to nylon 6 regardless of the content of PEO-PPO diamine. The DMA results show that the mobility of polymer chain in noncrystalline structure increases. It was considered that PEO-PPO diamine provides flexible segments and hydrophilic moieties to NPA. The analysis of moisture regain and tenacity was revealed that NPA exhibited 7.38 % moisture regain and 2.85 g/ denier tenacity. Keywords: Nylon 6, Nylon 4,6, Copolymer, Poly(ethylene oxide) diamine, Moisture regain
required for clothing to replace cotton fibers. In order to improve the hydrophilicity of synthetic fibers, research is being actively conducted through surface modification or copolymerization with a hydrophilic polymer. Zaman et al. [8] modified nano-crystalline cellulose on the PET surface to enhance hydrophilicity, they reported the moisture regain of modified PET increased to 3.99 %. Son et al. [9] studied synthesis and hydrophilicity of polytrimethylene 2,6-naphthalate (PTN)/polyethylene glycol (PEG) copolymer and reported hydrophilicity of PTN/PEG copolymer was increased according to molecular weight and content of PEG. Kim et al. [10] established optimal condition of papain treatment for improving the hydrophilicity of polyester fabric. They reported that treated polyester fabric exhibited twice higher moisture regain (1.20 %) than pure polyester fabric (0.50 %). Kang et al. [11] synthesized a series of co-PET containing dimethyl terephthalate (DMT), 5sodiumsulfodimethyl isophthalate (DMS), dimethyl isophthalate (DMI) and PEG moiety to improve hydrophilicity, the results showed that water absorption of co-PET was increased according to increase DMS, PEG content. Many polymers including polyurethane, polyurea, polyester, polyimide and polyamide were cooperated with polyethylene oxide (PEO) to improve their moisture regain, because PEO provides flexible segments and hydrophilic moiety [12,13].
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