【摘要】 本文用差示扫描量热法与X光衍射法相结合,研究涤纶无定形纤维在室温下拉伸后,超分子结构形态的变化。由于采用非晶样品,在一定条件下避免了晶区的出现,肯定了在T_g附近的DSC的宽放热峰包是取向结晶的贡献。它可能是“第三相”的部分热行为。更多还原

【Abstract】 Polyester as-spun fihers were drawn with a draw ratio ( λ ) of 1.0-4.0 at ambient temperature. Their morphological structures have been studied by means of differential scanning calormetry (DSC) and X-ray diffraction.From DSC measurements, Tm was found to be 530.2 ± 0.4 k and there was a linear relationship between △Hm and λ:△Hm = 39.40 λ 5.05λ(J△g).There was little change of Tc with draw ratio.A broad exothermic region was observed in the zeighborhood of Tg. Its area increases with λ, and its lower temperature limit decreases with λ. The exothermic region is attributed to the crystallization of the oriented molecular chains in the amorphous samples, i.e. the so-called "third phase".更多还原