Thermal properties and non‐isothermal crystallization behavior of poly(trimethylene terephthalate)/poly(lactic acid) blends

Thermal properties and non‐isothermal melt‐crystallization behavior of poly(trimethylene terephthalate) (PTT)/poly(lactic acid) (PLA) blends were investigated using differential scanning calorimetry and thermogravimetric analysis. The blends exhibit single and composition‐dependent glass transition temperature, cold crystallization temperature (T_cc) and melt crystallization peak temperature (T_mc) over the entire composition range, implying miscibility between the PLA and PTT components. The T_cc values of PTT/PLA blends increase, while the T_mc values decrease with increasing PLA content, suggesting that the cold crystallization and melt crystallization of PTT are retarded by the addition of PLA. The modified Avrami model is satisfactory in describing the non‐isothermal melt crystallization of the blends, whereas the Ozawa method is not applicable to the blends. The estimated Avrami exponent of the PTT/PLA blends ranges from 3.25 to 4.11, implying that the non‐isothermal crystallization follows a spherulitic‐like crystal growth combined with a complicated growth form. The PTT/PLA blends generally exhibit inferior crystallization rate and superior activation energy compared to pure PTT at the same cooling rate. The greater the PLA content in the PTT/PLA blends, the lower the crystallization rate and the higher the activation energy. Moreover, the introduction of PTT into PLA leads to an increase in the thermal stability behavior of the resulting PTT/PLA blends. Copyright © 2011 Society of Chemical Industry     

PTT纤维长毛绒产品数字化测配色方法探讨

应用datacolor SF600分光光度计及datamatch3．5测色配色软件,采用条件等色的计算机配色方式,以CIE标准施照态D65和CIE标准观察者为基础,探讨了用于长毛绒产品的PTT纤维数字化测配色工艺路线与技术方法,分析了在可见光范嗣内PTT纤维染色过程中反射率R％、K／S值的变化规律．以R、Y、B色料三原素为基础建立了用于PTT纤维配色数据库,得到能在CIE标准施照态D65和CIE标准观察者2个条件下染得与产品标样相同色泽的染色处方,其方法可对纤维类产品的染色测色配色提供借鉴．     

QChat平台性能指标研究

为进一步加强QChat平台运行质量监测与考核,在分析QChat平台网络架构的基础上,结合中国电信QChat现网平台统计数据,从开户用户数、话务量以及运行质量等三个方面构建了QChat平台指标体系,从信令点上定义了QChat平台接入性能指标,给出QChat平台运行质量监测指标和考核指标建议。     

十字形PTT与PET长丝的力学性能模型

对长丝之间的力学作用进行了模型建立和分析,利用四元件模型对十字形PTT和PET长丝的蠕变行为分别进行力学阐述,得出了长丝的力学参数:弹性模量、黏滞系数。利用这些微观参数验证长丝的应力松弛行为,得到与宏观表现较为合理的相似性。四元件模型从理论上对长丝的力学性能进行了表征,不仅可描述长丝的急弹性、缓弹性变形,还可同时验证长丝的塑性变形,更优于三元件模型。     

PTT长丝/天丝短纤复合纱面料的热加工设计

为了充分发挥PTT长丝和天丝短纤各自的优良特性,形成优势互补,将PTT长丝和天丝短纤通过空心锭包覆和网络加工开发复合纱面料.本文针对PTT长丝/天丝短纤单纱空心锭包覆复合纱和PTT长丝/天丝短纤单纱网络复合纱面料的开发,探讨了PTT纤维的热加工性能及其与PTT长丝/天丝短纤复合纱面料设计的关系.结果表明,充分利用PTT纤维热加工对织物结构及性能变化的作用,优化面料设计方案,是实现PTT长丝/天丝短纤复合纱面料设计目标的关键,从而开发出了手感柔软滑爽、光泽柔和、弹性足且悬垂感强的新颖面料.     

Dependence of sheet resistance of nickel-plated PANi/PTT composite fabric on electroless plating conditions

Flexible and stretchable conductive composite fabrics have wide applications, including wearable sensors, antenna, electrodes, solar batteries, signal, or power transmission. For most of applications, the electrical conductive fabrics need a low sheet resistance and antioxidation. To improve the stability and the electrical conductivity of PANi/PTT composite conductive fabric, some conductive composite fabrics were prepared by electroless nickel plating on PANi/PTT composite fabrics in the aqueous nickel sulfate solutions. The sheet electrical properties of the composite fabric were evaluated by the van der Pauw method, and the effect of the chemical plating conditions such as reducing agent, complexing agent, and buffer agent concentrations were investigated on the sheet resistance as well as the mechanical properties of fabric substance. The results show that the lower sheet resistance of composite fabrics was observed at the concentrations of NiSO₄, 25 g/L, NaH₂PO_2, 20 g/L, Na₃C₆H₅O₇, 15 g/L, CH₃COONa, 20 g/L, respectively. Additionally, the mechanical properties of the Ni/PANi/PTT composite fabrics were improved in comparison with those of PANi/PTT composite fabrics.     

PTT/PET双组分聚酯弹性面料加工工艺研究

通过多次实验对比,制定出了双组分弹性面料的最佳织造、染整工艺,特别针对弹性面料张力问题进行了系列实验,保证生产过程中张力均匀,同时为提高产品色牢度,选用进口UN/SE分散染料系列,最终确保新面料具有舒适弹性、手感滑糯、吸湿透气、悬垂性好等特点.     

PTT/PET复合长丝仿毛织物服用性能研究

文章介绍了新型聚酯复合纤维PTT/PET的性能及其在新产品开发中的应用;阐述了PTT/PET复合纤维仿毛织物的特性;并以普通仿毛面料和纯毛面料为参照物,重点对PTT/PET复合长丝纤维仿毛织物的基本服用性能进行了测试.分析认为,PTT/PET复合长丝仿毛织物的柔软度与纯毛织物相似,且具有较好的弹性回复性和折皱回复性.这说明利用PTT/PET复合长丝设计的新型织物既符合仿毛面料的发展趋势,同时也满足消费者的需求.     

PTT纤维的性能测试与分析

为探讨PTT纤维的性能特征,系统对比分析了PTT纤维、PA纤维、PTT/PET纤维、PTT/PBT纤维以及高收缩PET纤维共5种纤维的拉伸性能、回弹性能、卷曲性能及沸水收缩性.试验表明,PTT纤维具有优良的弹性回复率,PTT/PET纤维、PTT/PBT纤维的的卷曲性和沸水收缩性能比PTT纤维更为优异,认为在今后PTT纤维的研究中可以尝试对其结构改进,以更好发挥其性能优势.     

PTT混纤针织物风格的主观评价

采用分级评定法对PTT短纤、长丝、PTT/PET的复合丝与常规纤维混纺交织研制的31种针织面料进行了主观评价打分,然后对这些试样的评价值的平均值及标准偏差分别进行了比较.结果表明,在锦纶长丝与PTT长丝交织成的长丝针织物中使用0.11 tex的锦纶能够改善织物的手感;在PTT/PET并列复合丝与细旦涤纶交织制成的针织物中使用0.22～0.33 tex的并列复合丝虽然可提高弹性,但会降低手感,在产品设计时应考虑将其他手感优良的纤维覆盖在织物表面;加入适当细度及含量的涤纶纤维可降低织物成本,提高产品的尺寸稳定性.