| Synthesis polymer materials have excellent performance, they are widely used in people’s production and daily life. However, the synthesis polymer materials are hard degradation when they are waste, and they take pollution to the ecological environment of the earth. Developing biodegradable polymer material is an effective way to deal with environmental pollution problems. Aliphatic polyesters attracted people’s attention as environment friendly materials. Their main chain contain ester bonds and the ester bonds can be degraded under the action of microorganisms, enzymes, water molecules. Poly(butylenes succinate)(PBS) is a typical aliphatic polyester. It has excellent processing performance, mechanica properties and heat resistance. It can be processed on universal plastic processing equipment. Therefore, it has been successfully applied in the field of biodegradable plastics and films. PBS has small intermolecular force, low melting point and poor thermal stability because of its aliphatic polyester properties. So its application in the field of fiber is greatly limited and there are no reports on the industrialization of PBS fibers. Preparing PBS fibers can greatly expand the application fields of PBS and change the current status of the mostly fibrous materials are non-biodegradable.In this paper, PBS was ynthesized by direct esterification-polycondensation method in 3L autoclave, using 1,4-succinate(SA) and 1,4-butanediol(BD) as main raw materials, tera-n-butyl(TBT) as catalyst, triphenyl phosphate(TPP) as heat stabilizer. The effects of process conditions to the reaction process and the properties of the product were studied, including the feeding mole ratio, the reaction temperature, the condensation temperature, the amount of catalyst and stabilizer. The synthesis results showed that the optimum conditions were: the feeding mole ratio was 1.2, esterification temperature was 175℃, condensation temperature was 230℃, heat stabilizers TPP’s dosage was 0.4‰ of succinic moles, using tetra-n-butyl as catalyst, the catalyst’s dosage was 1.5 ‰ of succinic moles. Fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance(1H-NMR) test showed that the synthesized product was PBS polyester.Rheological test showed that PBS was typical shear thinning non-newtonian fluid, its viscous flow activation energy decreased as shear rate increasing, non-newtonian index increased as temperature increasing, viscosity structure index decreased as temperature increasing.The research of PBS-POY spinning process results showed that the spinnability was good when the spinning temperature was in the range of 240℃ to 260℃, spinning speed was in the range of 2000m/min to 2400m/min. The mechanical properties of the fibers under different spinning process conditions were tested and the results showed that: the fiber’s fracture strength and elongation at break decreased when the spinning temperature increased, the fiber’s fracture strength increased and elongation at break decreased when the spinning speed increased.The study of dynamic thermal stress results indicated that based on the obtained PBS-POY’s current situation, the stretching temperature of PBS should be controlled in 90℃, tensile speed should be controlled in 50m/min, the draw ratio should be controlled in 1.7 times, in this case, the thermal stress of the fiber was small, the stretching was smoothly. Thermal performance analysis showed that a certain temperature or tensile stress could make PBS crystallization. In the range of experimental stretching temperature(from room temperature to 90 ℃), the crystallinity of the fiber increased when the stretching temperature increased. In the range of experimental stretching ratio(from 1.4 to 1.7 times), the crystallinity of the fiber increased when the draw ratio increased. The XRD test showed that the crystal of PBS was not changed before and after stretching. The(110) crystal planes of the fiber had been grown after stretching. The crystallinity of the fiber increased as the draw ratio increased. |
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