Physical Properties of Poly(vinyl chloride) Graft Copolymer and Polyurethane Blends

• Main Authors: Yu-Hsin Tu, 杜育昕
• Other Authors: Ynh-Yue Yen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/qu2dry

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 104 === Poly(vinyl chloride) (PVC-S80) or polyurethane-grafted poly(vinyl chloride) (PVC-C1800) was blended with thermalplastic polyurethane (TPU), diethylhexyl terephthalate plasticizer and calcium (and zinc) stearate heat stabilizer by a rolling mill at 190°C for 10 min. After thoroughly mixing the composite speciments(PVC-S80/TPU or PVC-C1800/TPU) were obtained by pressing blends at 175°C for 10 min under a pressure of 1200 psi. Thermogravimetric analysis (TGA) results showed that the polyurethane would assist the degradation of PVC. Both differential scanning calorimetry (DSC) and differential mechanical analyzer (DMA) data exhibited that the glass transition temperature (Tg) of the composite decreased with increase of TPU in either PVC-S80/TPU or PVC-C1800/TPU. The PVC-S80/TPU gave a higher value of Tg to the corresponding PVC-C1800/TPU indicating that the PVC-S80/TPU remained much of the characteristic of PVC. The values of the tensile strength, modulus at 100% elongation and ultimate elongation at break for PVC-C1800 composite (C1) which is composed polyurethane –grafted PVC were higher than those of PVC-C1800/TPU samples. However, some of PVC-S80/TPU samples showed better above properties than the PVC-S80 composite (S1) which consists of PVC. This implies that the addition of TPU weakens the tensile properties of PVC-C1800 composites. The low temperature fracture properties of both PVC-S80 and PVC-C1800 composite samples were about the same and the introduction of TPU into both composites improved the toughness of the materials.