Dyeable Polyprophylene (PP) Modified By Polystyrene-Garamite And Research On These Blends

Because of a lack of polar groups, the dyeing behavior of Polypropylene (PP) is poor. For this reason, the applications of PP fiber are restricted in textile. In this paper, the preparation of polystyrene (PS)-Garamite particles as dyeable modifiers for PP fibers was studied. Then the particles were added into PP matrix as modification additions through melt blending. The system of PP/PS-Garamite was studied, and fine-denier fibers with good dyeability were obtained. Some exciting results were showed as follows.PS-Garamite particles with different Garamite content were prepared through in-situ suspension polymerization. The FTIR results can confirm that the PS and Garamite were existed in the hybrid particles. XRD showed the layer spacing of the Garamite was not changed after the polymerization. The contents of Garamite in PS-Garamite particles were increased with increasing dosage of Garamite when the total dosage is below 8%.The PP/PS-Garamite blends were studied systematically. The Garamite has a good dispersity in the blends through SEM observing. Mechanical property testing results showed that the tensile strength, elongation at break and elastic modulus of the PP/PS-Garamite blends were declined dramatically as the contents of Garamite ascending. The crystal morphology and crystallization of PP/PS-Garamite blend system has been studied through the polarizing microscope (PLM) and optical polarimeter. The results showed that the spherulite formed by blend system was smaller than the spherulite formed by pure PP. The entering of PS-Garamite particles changed the growth of PP and accelerated the crystallization rate of PP. At the same time, the thermal property of the blend system was also studied by using differential scanning calorimeter (DSC). The results showed that the melting temperature and crystal temperature were increased, however, the crystallinity was decreased along with the rising of Garamite contents. TGA results showed that there was only one thermal degradation temperature (Td) in the system. The thermal decomposition temperature was increased with the Garamite entering. Rheology test results showed that the viscosity, storage modulus and loss modulus of the PP/PS-Garamite blend system were increased along with the Garamite content’s rising and temperature’s rising.The fine-denier PP/PS and PP/PS-Garamite fibers were prepared with a melt spinning machine. The spinnability of the PP/PS and PP/PS-Garamite blends systems and the mechanical properties of the fibers were studied. Compared to PP/PS fibers, at the same draw ratio, the PP/PS-Garamite fibers exhibited higher orientation. Through the dyeing test, the PP/PS-Garamite fibers showed high K/S value and C* value, which can demonstrate that PS-Garamite particles were effective dyeability modifiers for PP fibers.At the same time, another line of blending was explored. Garamite were blending with PS and PP directly, formation PP/PS/Garamite blends. Compared to PP/PS-Garamite blend fibers, PP/PS/Garamite blend fibers were hard to form. The elongation and single-wire intensity of PP/PS/Garamite blend fibers were smaller than those on PP/PS-Garamite blend fibers. With the same proportion of Garamite, PP/PS/Garamite blend fibers have a higher crystallinity, that is to say, the damage of crystal structure was smaller. The K/S value and the C* value of PP/PS/Garamite blend fibers were lower than PP/PS-Garamite blend fiber, indicating the dyeing effect of PP/PS-Garamite blend fibers was better than PP/PS/Garamite blend fibers.