Thermal behavior and morphology of polycaproamide (PCA)/cationic dyeable polycaproamide (CD‐PCA) polyblended filaments

Abstract

Polycaproamide (PCA) polymer and cationic dyeable polycaproamide (CD-PCA) polymer were blended mechanically in the proportions of 75/25, 50/50, and 25/75 in a melt twin-screw extruder to prepare three PCA/CD-PCA polyblended polymers. Blends of PCA and CD-PCA were spun into filaments. The molar ratio of 5-sodium sulfonate dimethyl isophthalate (5-SSDMI) for CD-PCA polymer was 1.99%. This study investigated the physical properties of PCA/CD-PCA polyblended filaments using gel permeation chromatograph (GPC), nuclear magnetic resonance (NMR), gas chromatography (GC), potentiometer, thermogravimetric analysis (TGA), a rheometer, differential scanning calorimetry (DSC), the density gradient method, wide-angle X-ray diffraction (WAXD), extension stressstrain measurement, and scanning electron microscope (SEM). Flow behavior of PCA/CD-PCA polyblends exhibited positive-deviation blends (PDB), and the 50/50 blend of PCA/CD-PCA showed a maximum value of the melt viscosity. Experimental results of the DSC indicated PCA and CD-PCA molecules easily formed miscible domains. The crystallinities of PCA/CD-PCA polyblended filaments decreased as the 5-SSDMI content increased. Tenacities/densities of PCA/CD-PCA polyblended filaments were also found to decline as the 5-SSDMI content increased. The surface of PCA/CD-PCA polyblended filament exhibited a uniform morphology from the SEM data. PCA and CD-PCA polymers were proved to be a compatible system. The weight loss percentages of the PCA/CD-PCA polyblended filaments increased as the 5-SSDMI content increased in aqueous NaOH solution. The porous morphology of a larger size from 0.01 to 2 m in diameter was observed after alkali treatment of PCA/CD-PCA polyblended filament.

Rheology, thermal characteristics, crystallinity, tenacity and density of cationic dyeable polycaproamide/cationic dyeable poly(trimethylene terephthalate) polyblended fibers

“…In a previous investigation, we reported some miscible and immiscible polymer blends. Miscible polymers included PET/CD‐PET,10 PCA/CD‐PCA,11 and PTT/CD‐PTT 12. Immiscible polymers included PCPL/CD‐PET,13 PA 6/m‐iPP,14 PTT/MIPP,15 CD‐PET/m‐iPP,16 and CD‐PTT/m‐iPP 17.…”

Preparation and Physical Properties of Hollow Polyester Filaments with High Breathability, Water Absorption and Release Rates

“…Heidemann noted that the radius of the fi bres declined as the concentration of aqueous NaOH solution increased 9 . Hsiao et al found that the kinetics of alkaline hydrolysis of the PET/CDPET polyblended hollow fi bre resembled that of PET hollow fi bres [10][11][12][13][14][15] . The natural fi bre cotton is very comfortable for clothing purposes.…”

Physical properties of polyamide 6/metallocene isotactic polypropylene conjugated filaments

“…There are some reports on the physical properties of polyamide 6 (PA 6) with other polymers such as poly(ethylene terephthalate), cationic dyeable poly(ethylene terephthalate), poly(butylene terephthalate), cationic dyeable polyamide 6, polyethylene, and Ziegler–Natta isotactic polypropylene 5–15. Polypropylene resins have been produced from Ziegler–Natta catalysts for over 45 years now.…”