No abstract

In this work, we have synthesis nylon-6/ polyethylene oxide (PEO) copolymer system based on feed ratio of PEO (0$ 10 wt %) through condensation polymerization in a pilot scale. The structure of copolymer was confirmed by Fourier transform infrared (FTIR) spectroscopy and verified by 1 H nuclear magnetic resonance ( 1 HNMR). The thermal properties were investigated by differential scanning calorimetry (DSC) and indicated both melting temperature (T m ) and cold crystallization temperature (T c ) appearing unapparent decreased while increased PEO content in copolymers. The incorporation of PEO into the nylon-6 chain reduced its tensile strength, modulus, and heat distortion temperature (HDT). The notched Izod impact strength of and ductility of the copolymers improved significantly as the PEO content was increased. The plasticizing effect was caused by the soft segments from PEO, which increases the mobility of the molecular chain in the copolymers. The results of mechanical tests agree closely with dynamic mechanical analysis (DMA) measurements. A rheological investigation revealed that neat nylon-6 and its copolymer displayed similar behavior. The crystalline structure was examined by wide-angle X-ray diffraction (WAXD). The results demonstrate that the addition of a little PEO altered the crystallization from the a form to the c form, mainly owing to the breaking parts of the original H-bonds by the incorporation of ether groups. A mechanism of interaction between the amide and the ether group in nylon-6/PEO copolymers is proposed. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: [796][797][798][799][800][801][802][803][804][805][806] 2012

A series of poly(ethylene oxide) (PEO) and nylon-6 copolymers were synthesized through condensation reactions. The rheology of the prepared copolymers was tested using a capillary flow rheometer. The molar mass was investigated by performing basic analyses such as relative viscosity, gel permeation chromatograph, and amino-end group analysis. Their thermal properties were examined by differential scanning calorimetry, and the crystalline structure was determined using wide-angle X-ray diffraction. The results obtained from partially oriented yarn indicated a dramatically conversion from the c form to the a form. Following the draw texture process, the a form dominated all draw textured yarn. Once the segments of PEO were introduced into the nylon-6 backbone, the moisture regain and q max (warm/cool feeling) of the fabrics was enhanced remarkably. The surface resistivity of fabrics improved with increasing PEO content, which is mainly due to water absorption. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E206-E217, 2012