Synthesis and characterization of polyethylene oxide and nylon‐6 copolymer in a fiber form

Rwei, Syang‐Peng; Tseng, Yu-Chi; Lin, Weipeng

doi:10.1002/app.36676

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…As the adding ratio of PTA varied from 1 to 20%, the peak intensity of e and f increased correspondingly. Based on the above discussions, the PA6 based copolymer was successfully synthesized in which the aromatic segments randomly arranged …”

Section: Resultsmentioning

confidence: 99%

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Peng

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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In this work, a novel synthetic path for preparing semi-armotic components modified polyamide 6 was developed by caprolactam as solvent of purified terephthalic acid and 1,6-hexanediamine. First, the ring opening reaction and poly-addition of caprolactam were initiated by 1,6-hexanediamine to generate a prepolymer containing amino groups in both ends, then followed by the poly-condensation reaction with purified terephthalic acid, a long chain copolymer was produced, which the reaction time was reduced by 4 h compared with conventional hydrolytic ring-opening polymerization of pure caprolactam. By varying the ratio of terephthalic acid and 1,6-hexanediamine, a series of copolymers with different number average molecular weight and physical properties were prepared. Analytical results showed that the conversion percentage of caprolactam is significantly increased by the proposed method. Furthermore, this new copolymers exhibited excellent transparence and high decomposition temperature. Besides, the copolymers with average molecular weight !15,000 present good mechanical properties, making it a potentially useful application in plastics, textile yarn, and membranes. V C 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 959-967

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Section: Resultsmentioning

confidence: 99%

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Peng

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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“…In a melt spinning process, the spinning temperature and decomposition temperature are two important factors. 26,27 Generally, the spinning temperature should exceed the melting temperature ( T m ), but be lower than the decomposition temperature of the polymer, to prevent decomposition. The spinning temperature is adjusted to within the suitable range for melt flow.…”

Section: Resultsmentioning

confidence: 99%

Characterization of melt spinnability of ethylene vinyl alcohol copolymers

Rwei

Jue

Chiang

et al. 2015

Textile Research Journal

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This study investigates melt spinnability of ethylene vinyl alcohol (EVOH) copolymers with various ethylene contents, which exhibits excellent biocompatibility but cannot easily undergo single-component fiber spinning. The chemical, thermal and rheological properties of EVOH were examined herein. Three EVOH copolymers, EV-32, 38 and 44, with different ratios of ethylene to vinyl alcohol (EV ratio), were used to evaluate the influence of the ratio on melt spinnability. The EV ratios of EV-32, EV-38 and EV-44 examined by nuclear magnetic resonance were 0.64, 0.82 and 1.0, respectively. The experimental results reveal that the melting temperature ( Tm) and crystallinity ( Xc) of EVOH decreased in the order EV-32 (178.9℃, 46.6 wt%) > EV-38 (171.9℃, 41.8 wt%) > EV-44 (166.0℃, 40.0 wt%). The thermal stability, however, increases in the order EV-32 < EV-38 < EV-44. The viscosity decreases in the order EV-32 > EV-38 > EV-44. EV-44 has much higher flow activation energy than EV-32 and EV-38, indicating that it has a temperature sensitivity higher than EV-32 and EV-38. The pellets of EV-32, EV-38 and EV-44 were melt spun. Three as-spun fibers, EV-32, EV-38 and EV-44 have cross-sectional diameters of 151.3, 150.9 and 154.1 µm and tensile stresses (strain (%) at breaking point) of 123.1 (205.2%), 121.4 (202.0%) and 131.1 MPa (180.2%), respectively. Most importantly, EV-44 can easily be spun at a relatively low temperature, 245℃, while the other two, EV-38 and EV-32, can hardly be made on condition that the spinning temperatures are higher than 255℃ and 265℃, respectively. Notably, once the spinning temperature of EVOH polymers was higher than 258℃, the degradation of vinyl alcohol segments would cause fuming and broken filaments to eventually terminate the entire spinning process. Ultimately, a brand new fiber, EVOH, with an EV ratio of 1.0, was successfully melt spun and mechanically characterized in this study.

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“…Polycaprolactam (PA6) is a typical semicrystalline polymer drawing great attention from both the commercial and academic communities . Most PA6 resins are applied to prepare synthetic fiber (Nylon 6) and play an important role in the textile industry, due to their excellent processibility and physical properties . Regrettably, restricted by its flexible alkyl chain structure, the mechanical properties of PA6 fiber do not meet the demands in some special engineering fields such as advanced fiber reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

Melt polymerized aramid/polycaprolactam copolymer and its fiber

Wang

Zhang

et al. 2013

Polym. Int.

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A melt polymerization method was introduced to synthesize a series of aramid/polycaprolactam copolymers (APA). In this strategy, a modified aramid (MA) containing para-and meta-disubstituted benzene rings was dissolved in molten caprolactam (CPL) and then copolymerized with CPL to obtain APA. In contrast to neat polycaprolactam (PA6), the glass transition temperature (T g ) and crystallization temperature (T c ) of APA were maximally raised by 9 • C and 135 • C, respectively. The crystal form of APA was similar to that of PA6 and only one α-form existed in the crystallization region of the copolymer. However, the completeness of the crystal grains was disrupted by the aramid component and the apparent viscosities (η a ) of APA were obviously higher than for PA6, which indicated that the aromatic segments in the APA backbone restricted the mobility of the PA6 chains. In addition, APA was easily melt-spun into continuous fiber, and the tensile strength of the fiber was significantly increased by 140.97% with introduction of 5 wt% MA compared with neat PA6 fiber.

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Synthesis and characterization of polyethylene oxide and nylon‐6 copolymer in a fiber form

Cited by 5 publications

References 26 publications

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

Characterization of melt spinnability of ethylene vinyl alcohol copolymers

Melt polymerized aramid/polycaprolactam copolymer and its fiber

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