应用PTT纤维开发毛纺产品

就应用PTT纤维开发毛纺面料过程中的几个技术难点,如原料选择、染色、纺纱、织造、染整等工艺的调整进行了简单的介绍。指出应用PTT纤维开发毛纺面料,不仅能降低企业成本,同时能赋予面料新的性能。     

PTT纤维及织物的结构、性能与应用

针对PTT纤维的特殊结构,分析了其性能与应用中的关键技术。PTT纤维具有良好的手感柔软性、拉伸弹性、尺寸稳定性等,因此适宜开发机织面料。测试了三毛、十七棉和宁波中鑫PTT面料的一般性能。     

聚对苯二甲酸丙二酯短纤维生产工艺研究

利用现有涤纶短纤维生产设备,使用壳牌化学公司聚对苯二甲酸丙二酯(PTT)切片原料成功纺制了1.67dtex×38mm短纤维,纤维强度3.0cN/dtex,伸长73.1%。纺丝工艺条件是:纺丝温度为258~268℃,纺速1100m/min,拉伸油浴50℃,拉伸总倍数2.25~3.20,干燥条件则与涤纶相同。     

PTT拉伸丝的生产工艺探讨

采用POY-DT生产工艺路线,在POY纺丝线和经改造的平衡拉伸机设备上生产出PTT长丝。着重指出了PTT纤维生产在干燥、纺丝、卷绕、平行拉伸上和PET纤维的不同,并结合实例对POY—DT工艺的要求作了探讨。     

Effect of zone drawing on the structure and properties of melt‐spun poly(trimethylene terephthalate) fiber

Melt‐spun poly(trimethylene terephthalate) (PTT) fibers were zone‐drawn and the structures and properties of the fibers were investigated in consideration of the spinning and zone‐drawing conditions. The draw ratio increased up to 4 with increasing drawing temperature to 180°C, at a maximum drawing stress of 220 MPa. Higher take‐up velocity gave lower drawability of the fiber. The PTT fiber taken up at 4000 rpm was hardly drawn, in spite of using maximum drawing stress, because a high degree of orientation had been achieved in the spinning procedure. However, an additional enhancement of birefringence was observed, indicating a further orientation of PTT molecules by zone drawing. The exotherm peak at 60°C disappeared and was shifted to a lower temperature with an increase in the take‐up velocity, which means that the orientation and crystallinity of the fiber increased. The d‐spacing of (002) plane increased with increasing take‐up velocity and draw ratio, whereas those of (010) and (001) planes decreased. In all cases, the crystal size increased with take‐up velocity and draw ratio. The cold‐drawn PTT fiber revealed a kink band structure, which disappeared as the drawing temperature was raised. The physical properties of zone‐drawn PTT fibers were improved as the draw ratio and take‐up velocity increased. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3471–3480, 2001     

微合金碳氮化物在铁素体中沉淀析出的PTT曲线的理论计算

根据经典形核长大动力学理论,分析解决了包括相变化学自由能、界面能、形核沉淀方式等一系列相关参量的理论计算或理论处理问题,由此提出了微合金钢中微合金碳氮化物在铁素体基体中沉淀析出的PTT曲线(沉淀量-温度-时间曲线)的相对定量理论计算方法.     

聚对苯二甲酸丙二醇酯树脂的流变特性研究

采用毛细管流变仪研究聚对苯二甲酸丙二醇酯（PTT）和聚对苯二甲酸乙二醇酯（PET）的流变性能。结果表明,PTT与PET一样,都是切力变稀流体,从PTT在255℃时的非牛顿指数比PET在280℃时低和PTT的弹性雷诺准数（NRt,dl)随切变速率增加比PET明显可看出,PTT不但切力变稀现象更严重些,而且更易储存可回复弹性能,因而纺丝工艺更需稳定控制。     

Three-dimensional orientation change during thermally induced structural change of oriented poly(trimethylene terephthalate) films using polarized FTIR–ATR spectroscopy

The three-dimensional orientation change during thermally induced structural change was monitored in a ‘real-time’ mode with polarized FTIR–ATR spectroscopy using a double-edged parallelogram crystal in a temperature-controlled ATR set-up. Upon cold-crystallization of stretched PTT sample, the growth of crystalline phase along the stretching direction was much faster than those along the perpendicular directions. The cold-crystallization of melt-quenched amorphous PTT was found to produce crystallites of no orientation, as expected. The formation of crystalline phase along three orthogonal directions was followed by changes of three attenuation indices of 1358 cm⁻¹ band which is associated with the wagging vibration motion of CH₂ groups in crystalline phase. The orientation of CH₂ groups in amorphous phase estimated from three attenuation indices of 1385 cm⁻¹ band along three directions was very small even for the cold-crystallized, anisotropic PTT sample. This work appears to be the first successful observation in a ‘real-time’ mode on the dynamic change of three-dimensional orientation of polymeric materials using temperature-controlled polarized FTIR–ATR spectroscopy.     

Depolymerization of poly(trimethylene terephthalate) in supercritical methanol

The depolymerization of poly(trimethylene terephthalate) (PTT) in supercritical methanol was carried out with a batch‐type autoclave reactor at temperatures ranging from 280 to 340°C, at pressures ranging from 2.0 to 14.0 MPa, and for reaction time of up to 60 min. PTT quantitatively decomposed into dimethyl terephthalate (DMT) and 1,3‐propaniol (PDO) under the designed conditions. The yields of DMT and PDO greatly increased as the temperature rose. The yields of the monomers markedly increased as the pressure increased to 10.0 MPa, and they leveled off at higher pressures. The final yield of DMT at 320°C and 10.0 MPa reached 98.2%, which was much closer to the extent of the complete reaction. A kinetic model was used to describe the depolymerization reaction, and it fit the experimental data well. The dependence of the forward rate constant on the reaction temperature was correlated with an Arrhenius plot, which gave an activation energy of 56.8 kJ/mol. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2363–2368, 2004     

PTT-PBT共聚酯的核磁共振分析

利用直接酯化法合成了一系列不同配比的PTT-PBT（简称PTBT）共聚酯。采用核磁共振（NMR）和固体^13C-NMR研究了共聚酯的化学组成、序列结构和结晶性能。^1H-NMR和13C-NMR表明：PTBT为无规嵌段聚合物,而且共聚酯链段中PBT链段的实际含量都要小于投料比,可能归因于生成四氢呋喃的副反应消耗了部分丁二醇。共聚酯中各链段的序列长度与其含量成正比,即含量高的组份具有更长的平均序列长度,但PTT序列长度较短,PTT链段比PBT链段更倾向于发生交替反应。固体13C-NMR表明：PTBT共聚酯结晶主要是富集相对应的链段参与完成。