Bubble electrospinning technology can be used for mass production of nanofibers, it has been widely used in polymer electrospinning such as PVA, PVP and PAN, but there are no reports on the preparation of composite phase-change nanofibers by this method. In this paper, the transparent solution 1(PEG was put into formic acid according to the mass fraction of 60%) was mixed with the transparent solution 2 (PA66 was put into formic acid according to the mass fraction of 15%) according to the mass ratio of 15:85 , 25:75 , 35:65 and 45:55 to prepare four kinds of spinning solutions. And the pure PA66 nanofiber membrane(PNM) and PA66/PEG composite nanofiber membrane(PGCNM) were fabricated by the improved bubble electrospinning device on the basis of bubble electrospinning device invented by He Jihuan etc Also we analyzed their surface microstructure and tested their mechanical properties, thermal properties and molecular structure. The lower the content of PA66, the smaller the adhesion granular matter on the nanofiber surface and the thicker the diameter of the nanofiber, but the surface of the nanofiber is more smooth. The PGNCM appeared double absorption peak at 1515.5 cm−1 and 1642 cm−1 and existed weak absorption peak at 3298 cm−1 ∼ 3302 cm−1. The tensile strength and the elongation at break of the PGNCM was less than that of the PNM. The hot decomposition process of the PGNCM was composed the melting exothermic process of PEG and PA66. When the mixed ratio between PA66 and PEG was 15:85, the decomposition rate of residues between 210 ∼ 310 °C was the fastest.
In this work, we use the treated PF-ADF(2 ∼ 3 mm) as the reinforcing body(fiber) and the biodegradable PBS as the matrix. The different treated PF-ADF were mixed with PBS particles according to the mass percentage of 20:80, and C-PBS, C-DF/PBS, C-ADF/PBS and C-KDF/PBS were prepared by molding process. The influence of surface treatment on the microstructure and physical properties of the fiber were discussed and the mechanical properties of the composites were compared. Also the biodegradability of the different composite was analyzed. The results showed that most of the non-cellulosic materials such as pectin were removed from C-DF, but a certain amount of pectin remains on the surface. The surface of C-ADF appeared ‘S’ groove, and the groove on C-KDF was good continuity and deep. Compared with C-DF, the tensile strength of C-ADF and C-KDF increased by 5.08% and decreased by 3.58% respectively. Compared with C-PBS, the tensile strength and bending strength of C-KDF/PBS increased by 48.32% and 25.97% respectively, and the tensile modulus and bending modulus increased by 146.45% and 128.3% respectively. The changes of biodegradability of C-DF/PBS, C-ADF/PBS and C-KDF/PBS composites were consistent, but the change of weightlessness rate of C-KDF/PBS was the smallest. The more degraded and uneven the surface of the composite, the more obvious the decrease in contact angle.
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