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Effect of Blend Ratio and Draw Ratio on the Mechanical Properties of PET/PP Blended Conjugate Fibers
Authors:Chin-An Lin  Chun-Chi Chen
Affiliation:1. Graduate Institute of Textile Engineering, Feng-Chia University , Taichung , Taiwan , R.O.C.;2. Department of Raw Materials and Yarn Formation , Taiwan Textile Research Institute , Taipei , Taiwan , R.O.C.
Abstract:This study analyzes the influence of blend ratio and draw ratio on the fiber properties of blend fibers composed of poly (ethylene terephthalate), or PET, and polypropylene, or PP, (hereafter referred to as PET/PP conjugate fibers). For a comparison, PET and poly (butylene terephthalate), or PBT blends, (hereafter referred to as PET/PBT conjugate fibers) are also investigated. Various blend ratios of fibers are melt spun and drawn in a multistep drawing method. The conjugate fibers are evaluated using tenacity, Young's modulus, wide-angle X-ray diffraction, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) tests. The results show that multistep drawing using a lower first-step draw ratio provides a higher tenacity and Young's modulus. Furthermore, when the blend ratio is 75/25 in a PET/PP conjugate fiber and 50/50 in a PET/PBT conjugate fiber, the polymer components undergo a phase inversion phenomenon. A PP sub-micron (10?1 ~ 100 micron) fiber of about 0.0001 ~ 0.00017 tex in fineness, or about 0.4 ~ 0.5 micron in diameter, can be obtained when PET/PP conjugate fiber is treated with a 25% NaOH aqueous solution by weight. However, A PBT sub-micron fiber cannot be achieved using a PET/PBT conjugate fiber.
Keywords:Blend  Conjugate fiber  DSC  SEM  Sub-micron fiber
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